Add Alcyon C object file support

[rln] / rln.c

//
// RLN - Renamed Linker for the Atari Jaguar console system
// Copyright (C) 199x, Allan K. Pratt, 2014-2021 Reboot & Friends
//

#include "rln.h"
//#include <assert.h>

unsigned errflag = 0;                           // Error flag, goes TRUE on error
unsigned waitflag = 0;                          // Wait for any keypress flag
unsigned versflag = 0;                          // Version banner has been shown flag
unsigned aflag = 0;                                     // Absolute linking flag
unsigned bflag = 0;                                     // Don't remove mulitply def locals flag
unsigned cflag = 0;                                     // COF executable
unsigned dflag = 0;                                     // Wait for key after link flag
unsigned gflag = 0;                                     // Source level debug include flag
unsigned lflag = 0;                                     // Add local symbols to output flag
unsigned mflag = 0;                                     // Produce symbol load map flag
unsigned oflag = 0;                                     // Output filename specified
unsigned rflag = 0;                                     // Segment alignment size flag
unsigned sflag = 0;                                     // Output only global symbols
unsigned vflag = 0;                                     // Verbose flag
unsigned wflag = 0;                                     // Show warnings flag
unsigned zflag = 0;                                     // Suppress banner flag
unsigned pflag = 0, uflag = 0;          // Unimplemented flags (partial link, don't abort on unresolved symbols)
unsigned hd = 0;                                        // Index of next file handle to fill
unsigned secalign = 7;                          // Section Alignment (8=phrase)
unsigned tbase = 0;                                     // TEXT base address
unsigned dbase = 0;                                     // DATA base address
unsigned bbase = 0;                                     // BSS base address
unsigned textoffset = 0;                        // COF TEXT segment offset
unsigned dataoffset = 0;                        // COF DATA segment offset
unsigned bssoffset = 0;                         // COF BSS segment offset
unsigned displaybanner = 1;                     // Display version banner
unsigned symoffset = 0;                         // Symbol table offset in output file
unsigned dbgsymbase = 0;                        // Debug symbol base address
int noheaderflag = 0;                           // No header flag for ABS files
int hflags;                                                     // Value of the arg to -h option
int ttype, dtype, btype;                        // Type flag: 0, -1, -2, -3, -4
int tval, dval, bval;                           // Values of these abs bases
int hflag[NHANDLES];                            // True for include files
int handle[NHANDLES];                           // Open file handles
int textsize, datasize, bsssize;        // Cumulative segment sizes
char libdir[FARGSIZE * 3];                      // Library directory to search
char ofile[FARGSIZE];                           // Output file name (.o)
char * name[NHANDLES];                          // Associated file names
char * cmdlnexec = NULL;                        // Executable name - pointer to ARGV[0]
char * hsym1[SYMLEN];                           // First symbol for include files
char * hsym2[SYMLEN];                           // Second symbol for include files
struct OFILE * plist = NULL;            // Object image list pointer
struct OFILE * plast;                           // Last object image list pointer
struct OFILE * olist = NULL;            // Pointer to first object file in list
struct OFILE * olast;                           // Pointer to last object file in list
char * arPtr[512];
uint32_t arIndex = 0;
struct HREC * htable[NBUCKETS];         // Hash table
struct HREC * unresolved = NULL;        // Pointer to unresolved hash list
char * ost;                                                     // Output symbol table
char * ost_ptr;                                         // Output symbol table; current pointer
char * ost_end;                                         // Output symbol table; end pointer
char * oststr;                                          // Output string table
char * oststr_ptr;                                      // Output string table; current pointer
char * oststr_end;                                      // Output string table; end pointer
int ost_index = 0;                                      // Index of next ost addition
uint8_t nullStr[1] = "\x00";            // Empty string
struct HREC * arSymbol = NULL;          // Pointer to AR symbol table


// Function prototypes
struct HREC * LookupHREC(char *);
char * PathTail(char *);
void ShowHelp(void);
void ShowVersion(void);
int OSTLookup(char * sym);
int OSTAdd(char * name, int type, long value);
int ProcessFiles(void);
int doargs(int argc, char * argv[]);


//
// Get a long word from memory
//
static inline uint32_t GetLong(uint8_t * src)
{
        return (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];
}


//
// Put a long word into memory
//
static inline void PutLong(uint8_t * dest, uint32_t val)
{
        *dest++ = (uint8_t)(val >> 24);
        *dest++ = (uint8_t)(val >> 16);
        *dest++ = (uint8_t)(val >> 8);
        *dest = (uint8_t)val;
}


//
// Get a word from memory
//
static inline uint16_t GetWord(uint8_t * src)
{
        return (src[0] << 8) | src[1];
}


//
// Put a word into memory
//
static inline void PutWord(uint8_t * dest, uint16_t val)
{
        *dest++ = (uint8_t)(val >> 8);
        *dest = (uint8_t)val;
}


//
// Find passed in file's length in bytes
// N.B.: This also resets the file's pointer to the start of the file
//
long FileSize(int fd)
{
        long size = lseek(fd, 0, SEEK_END);
        lseek(fd, 0, SEEK_SET);

        return size;
}


//
// For this object file, add symbols to the output symbol table after
// relocating them. Returns TRUE if OSTLookup returns an error (-1).
//
int DoSymbols(struct OFILE * ofile)
{
        int type;
        long value;
        int index;
        int j;
        struct HREC * hptr;
        uint32_t tsoSave, dsoSave, bsoSave;

        // Point to first symbol record in the object file
        char * symptr = (ofile->o_image + 32
                + ofile->o_header.tsize
                + ofile->o_header.dsize
                + ofile->o_header.absrel.reloc.tsize
                + ofile->o_header.absrel.reloc.dsize);

        // Point to end of symbol record in the object file
        char * symend = symptr + ofile->o_header.ssize;

        uint32_t tsegoffset = ofile->segBase[TEXT];
        uint32_t dsegoffset = ofile->segBase[DATA];
        uint32_t bsegoffset = ofile->segBase[BSS];

        // Save segment vars, so we can restore them if needed
        tsoSave = tsegoffset, dsoSave = dsegoffset, bsoSave = bsegoffset;

        // Process each record in the object's symbol table
        for(; symptr!=symend; symptr+=12)
        {
                index = GetLong(symptr + 0);    // Obtain symbol string index
                type  = GetLong(symptr + 4);    // Obtain symbol type
                value = GetLong(symptr + 8);    // Obtain symbol value

                // Global/External symbols have a pre-processing stage
                // N.B.: This destroys the t/d/bsegoffset discovered above. So if a
                //       local symbol follows a global/exported one, it gets wrong
                //       info! [Should be FIXED now]
                if (type & 0x01000000)
                {
                        // Obtain the string table index for the relocation symbol, look
                        // for it in the globals hash table to obtain information on that
                        // symbol.
                        hptr = LookupHREC(symend + index);

                        if (hptr == NULL)
                        {
                                // Try to find it in the OST
                                int ostIndex = OSTLookup(symend + index);

                                if (ostIndex == -1)
                                {
                                        printf("DoSymbols(): Symbol not found in hash table: '%s' (%s)\n", symend + index, ofile->o_name);
                                        return 1;
                                }

                                if (vflag > 1)
                                        printf("DoSymbols(): Skipping symbol '%s' (%s) found in OST...\n", symend + index, ofile->o_name);

                                // If the symbol is not in any .a or .o units, it must be one
                                // of the injected ones (_TEXT_E, _DATA_E, or _BSS_E), so skip
                                // it [or maybe not? In verbose mode, we see nothing...!]
                                continue;
                        }

                        tsegoffset = hptr->h_ofile->segBase[TEXT];
                        dsegoffset = hptr->h_ofile->segBase[DATA];
                        bsegoffset = hptr->h_ofile->segBase[BSS];

                        // Update type with global type
                        type = hptr->h_type;

                        // Remove global flag if absolute
                        if (type == (T_GLBL | T_ABS))
                                type = T_ABS;

                        // If the global/external has a value then update that value in
                        // accordance with the segment sizes of the object file it
                        // originates from
                        if (hptr->h_value)
                        {
                                switch (hptr->h_type & 0x0E000000)
                                {
                                case T_ABS:
                                case T_TEXT:
                                        value = hptr->h_value;
                                        break;
                                case T_DATA:
                                        value = hptr->h_value - hptr->h_ofile->o_header.tsize;
                                        break;
                                case T_BSS:
                                        value = hptr->h_value
                                                - (hptr->h_ofile->o_header.tsize
                                                + hptr->h_ofile->o_header.dsize);
                                        break;
                                default:
                                        if (vflag > 1)
                                                printf("DoSymbols: No adjustment made for symbol: %s (%s) = %X\n", symend + index, ofile->o_name, hptr->h_value);
                                }
                        }
                }
                // If *not* a global/external, use the info from passed in object
                else
                        tsegoffset = tsoSave, dsegoffset = dsoSave, bsegoffset = bsoSave;

                // Process and update the value dependent on whether the symbol is a
                // debug symbol or not
                // N.B.: Debug symbols are currently not supported
                if (type & 0xF0000000)
                {
                        // DEBUG SYMBOL
                        // Set the correct debug symbol base address (TEXT segment)
#if 0
                        dbgsymbase = 0;

                        for(j=0; (unsigned)j<dosymi; j++)
                                dbgsymbase += obj_segsize[j][0];
#else
                        dbgsymbase = ofile->segBase[TEXT];
#endif

                        switch (type & 0xFF000000)
                        {
                        case 0x64000000:
                                value = tval + dbgsymbase;
                                break;
                        case 0x44000000:
                        case 0x46000000:
                        case 0x48000000:
                                value = tval + dbgsymbase + value;
                        default:
                                break;
                        }

                        PutLong(symptr + 8, value);
                }
                else
                {
                        // NON-DEBUG SYMBOL
                        // Now make modifications to the symbol value, local or global,
                        // based on the segment sizes of the object file currently being
                        // processed.
                        switch (type & T_SEG)
                        {
                        case T_ABS:
                                break;
                        case T_TEXT:
                                value = tbase + tsegoffset + value;
                                PutLong(symptr + 8, value);
                                break;
                        case T_DATA:
                                if (type & T_GLBL)
                                        value = dbase + dsegoffset + value;
                                else
                                        value = dbase + dsegoffset + (value
                                                - ofile->o_header.tsize);

                                PutLong(symptr + 8, value);
                                break;
                        case T_BSS:
                                if (type & T_GLBL)
                                        value = bbase + bsegoffset + value;
                                else
                                        value = bbase + bsegoffset
                                                + (value - (ofile->o_header.tsize
                                                + ofile->o_header.dsize));

                                PutLong(symptr + 8, value);
                                break;
                        default:
                                break;
                        }
                }

                // Add to output symbol table if global/extern, or local flag is set
                if (isglobal(type) || lflag)
                {
                        if (vflag > 1)
                                printf("DoSymbols: Adding symbol: %s (%s) to OST...\n", symend + index, ofile->o_name);

                        index = OSTAdd(symend + index, type, value);

                        if (index == -1)
                        {
                                printf("DoSymbols(): Failed to add symbol '%s' to OST!\n", symend + index);
                                return 1;
                        }
                }
        }

        return 0;
}


//
// Free up hash memory
//
void FreeHashes(void)
{
        int i;

        for(i=0; i<NBUCKETS; i++)
        {
                struct HREC * hptr = htable[i];

                while (hptr)
                {
                        struct HREC * htemp = hptr->h_next;
                        free(hptr);
                        hptr = htemp;
                }
        }
}


//
// Add all global and external symbols to the output symbol table
// [This is confusing--is it adding globals or locals? common == local!
//  but then again, we see this in the header:
//  #define T_COMMON  (T_GLOBAL | T_EXTERN) but that could be just bullshit.]
//
// Common symbols have a different number in the "value" field of the symbol
// table (!0) than purely external symbols do (0). So you have to look at the
// type (T_GLBL) *and* the value to determine if it's a common symbol.
//
long DoCommon(void)
{
        struct HREC * hptr;
        int i;

        for(i=0; i<NBUCKETS; i++)
        {
                for(hptr=htable[i]; hptr!=NULL; hptr=hptr->h_next)
                {
//NO!                   if (iscommon(hptr->h_type))
                        if (isglobal(hptr->h_type))// || isextern(hptr->h_type))
                        {
// Skip if in *.a file... (does nothing)
//if (hptr->h_ofile->isArchiveFile)
//      continue;

//Is this true? Couldn't an absolute be exported???
                                if (hptr->h_type == (T_GLBL | T_ABS))
                                        hptr->h_type = T_ABS;   // Absolutes *can't* be externals

                                if (OSTAdd(hptr->h_sym, hptr->h_type, hptr->h_value) == -1)
                                        return -1;
                        }
                }
        }

        return 0;
}


//
// Add a symbol's name, type, and value to the OST.
// Returns the index of the symbol in OST, or -1 for error.
//
int OSTAdd(char * name, int type, long value)
{
        int ost_offset_p, ost_offset_e = 0;     // OST table offsets for position calcs
        int ostresult;                                          // OST index result
        int slen = strlen(name);

        // If the OST or OST string table has not been initialised then do so
        if (ost_index == 0)
        {
                ost = malloc(OST_BLOCK);
                oststr = malloc(OST_BLOCK);

                if (ost == NULL)
                {
                        printf("OST memory allocation error.\n");
                        return -1;
                }

                if (oststr == NULL)
                {
                        printf("OSTSTR memory allocation error.\n");
                        return -1;
                }

                ost_ptr = ost;                                          // Set OST start pointer
                ost_end = ost + OST_BLOCK;                      // Set OST end pointer

                PutLong(oststr, 0x00000004);            // Just null long for now
                oststr_ptr = oststr + 4;                        // Skip size of str table long (incl null long)
                PutLong(oststr_ptr, 0x00000000);        // Null terminating long
                oststr_end = oststr + OST_BLOCK;
        }
        else
        {
                // If next symbol record exceeds current allocation then expand symbol
                // table and/or symbol string table.
                ost_offset_p = (ost_ptr - ost);
                ost_offset_e = (ost_end - ost);

                // 3 x uint32_t (12 bytes)
                if ((ost_ptr + 12) > ost_end)
                {
                        // We want to allocate the current size of the OST + another block.
                        ost = realloc(ost, ost_offset_e + OST_BLOCK);

                        if (ost == NULL)
                        {
                                printf("OST memory reallocation error.\n");
                                return -1;
                        }

                        ost_ptr = ost + ost_offset_p;
                        ost_end = (ost + ost_offset_e) + OST_BLOCK;
                }

                ost_offset_p = (oststr_ptr - oststr);
                ost_offset_e = (oststr_end - oststr);

                // string length + terminating NULL + uint32_t (terminal long)
                if ((oststr_ptr + (slen + 1 + 4)) > oststr_end)
                {
                        oststr = realloc(oststr, ost_offset_e + OST_BLOCK);

                        if (oststr == NULL)
                        {
                                printf("OSTSTR memory reallocation error.\n");
                                return -1;
                        }

                        oststr_ptr = oststr + ost_offset_p;
                        oststr_end = (oststr + ost_offset_e) + OST_BLOCK;
                }
        }

        // If this is a debug symbol and the include debug symbol flag (-g) is not
        // set then do nothing
        if ((type & 0xF0000000) && !gflag)
        {
                // Do nothing
                return 0;
        }

        // Get symbol index in OST, if any (-1 if not found)
        ostresult = OSTLookup(name);

        // If the symbol is in the output symbol table and the bflag is set
        // (don't remove multiply defined locals) and this is not an
        // external/global symbol *** OR *** the symbol is not in the output
        // symbol table then add it.
        if (((ostresult != -1) && bflag && !(type & 0x01000000))
                || ((ostresult != -1) && gflag && (type & 0xF0000000))
                || (ostresult == -1))
        {
                if ((type & 0xF0000000) == 0x40000000)
                        PutLong(ost_ptr, 0x00000000);   // Zero string table offset for dbg line
                else
                        PutLong(ost_ptr, (oststr_ptr - oststr));        // String table offset of symbol string

                PutLong(ost_ptr + 4, type);
                PutLong(ost_ptr + 8, value);
                ost_ptr += 12;

                // If the symbol type is anything but a debug line information
                // symbol then write the symbol string to the string table
                if ((type & 0xF0000000) != 0x40000000)
                {
                        strcpy(oststr_ptr, name);               // Put symbol name in string table
                        *(oststr_ptr + slen) = '\0';    // Add null terminating character
                        oststr_ptr += (slen + 1);
                        PutLong(oststr_ptr, 0x00000000);        // Null terminating long
                        PutLong(oststr, (oststr_ptr - oststr)); // Update size of string table
                }

                if (vflag > 1)
                        printf("OSTAdd: (%s), type=$%08X, val=$%08lX\n", name, type, value);

// is ost_index pointing one past?
// does this return the same regardless of if its ++n or n++?
// no. it returns the value of ost_index *before* it's incremented.
                return ++ost_index;
        }

        return ostresult;
}


//
// Return the index of a symbol in the output symbol table
// N.B.: This is a 1-based index! (though there's no real reason for it to be)
//
int OSTLookup(char * sym)
{
        int i;
        int stro = 4;           // Offset in string table

        for(i=0; i<ost_index; i++)
        {
                if (strcmp(oststr + stro, sym) == 0)
                        return i + 1;

                stro += strlen(oststr + stro) + 1;
        }

        return -1;
}


//
// Add unresolved externs to the output symbol table
// N.B.: Only adds unresolved symbols *if* they're not already in the OST
//
int DoUnresolved(void)
{
        struct HREC * hptr = unresolved;

        // Add to OST while unresolved list is valid
        while (hptr != NULL)
        {
                if (OSTAdd(hptr->h_sym, T_GLBL, 0L) == -1)
                        return 1;

                if (vflag > 1)
                        printf("DoUnresolved(): '%s' (%s:$%08X) in OST\n", hptr->h_sym, hptr->h_ofile->o_name, hptr->h_type);

                struct HREC * htemp = hptr->h_next;
                free(hptr);
                hptr = htemp;
        }

        unresolved = NULL;
        return 0;
}


//
// Update object file TEXT and DATA segments based on relocation records. Take
// in an OFILE header and flag (T_TEXT, T_DATA) to process. Return (0) is
// successful or non-zero (1) if failed.
//
int RelocateSegment(struct OFILE * ofile, int flag)
{
        char * symtab;                  // Start of symbol table
        char * symbols;                 // Start of symbols
        char * sptr;                    // Start of segment data
        char * rptr;                    // Start of segment relocation records
        unsigned symidx;                // Offset to symbol
        unsigned addr;                  // Relocation address
        unsigned rflg;                  // Relocation flags
        unsigned olddata;               // Old segment data at reloc address
        unsigned newdata = 0;   // New segment data at reloc address
        unsigned pad;                   // Temporary to calculate phrase padding
        int i;                                  // Iterator
        char sym[SYMLEN];               // String for symbol name/hash search
        int ssidx;                              // Segment size table index
        unsigned glblreloc;             // Global relocation flag
        unsigned absreloc;              // Absolute relocation flag
        unsigned relreloc;              // Relative relocation flag
        unsigned wordreloc;             // Relocate word only flag
        unsigned opreloc;               // Relocate OP data address only flag
        unsigned swcond;                // Switch statement condition
        unsigned relocsize;             // Relocation record size
        unsigned saveBits;              // OP data leftover bits save
        unsigned saveBits2;

        // If there is no TEXT relocation data for the selected object file segment
        // then update the COF TEXT segment offset allowing for the phrase padding
        if ((flag == T_TEXT) && !ofile->o_header.absrel.reloc.tsize)
        {
                // SCPCD : we should not increment the textoffset before the end of processing the object file, else data section will point to wrong textoffset
                return 0;
        }

        // If there is no DATA relocation data for the selected object file segment
        // then update the COF DATA and BSS segment offsets allowing for the phrase
        // padding
        if ((flag == T_DATA) && !ofile->o_header.absrel.reloc.dsize)
        {
                // SCPCD : the T_DATA is the last section of the file, we can now increment the textoffset, dataoffset and bssoffset

                // TEXT segment size plus padding
                pad = ((ofile->o_header.tsize + secalign) & ~secalign);
                textoffset += (ofile->o_header.tsize + (pad - ofile->o_header.tsize));

                if (vflag > 1)
                        printf("RelocateSegment(%s, TEXT) : No relocation data\n", ofile->o_name);

                // DATA segment size plus padding
                pad = ((ofile->o_header.dsize + secalign) & ~secalign);
                dataoffset += (ofile->o_header.dsize + (pad - ofile->o_header.dsize));

                // BSS segment size plus padding
                pad = ((ofile->o_header.bsize + secalign) & ~secalign);
                bssoffset += (ofile->o_header.bsize + (pad - ofile->o_header.bsize));

                if (vflag > 1)
                        printf("RelocateSegment(%s, DATA) : No relocation data\n", ofile->o_name);

                return 0;
        }

        if (vflag > 1)
                printf("RelocateSegment(%s, %s) : Processing Relocation Data\n",
                        ofile->o_name, flag == T_DATA ? "DATA" : "TEXT");

        // Obtain pointer to start of symbol table
        symtab = (ofile->o_image + 32 + ofile->o_header.tsize
                + ofile->o_header.dsize
                + ofile->o_header.absrel.reloc.tsize
                + ofile->o_header.absrel.reloc.dsize);

        // Obtain pointer to start of symbols
        symbols = symtab + ofile->o_header.ssize;

        // Obtain pointer to start of TEXT segment
        sptr = ofile->o_image + 32;

        // Obtain pointer to start of TEXT relocation records
        rptr = sptr + (ofile->o_header.tsize + ofile->o_header.dsize);

        relocsize = ofile->o_header.absrel.reloc.tsize;

    if (vflag)
        printf("RELOCSIZE :: %d  Records = %d\n", relocsize, relocsize / 8);

        // Update pointers if DATA relocation records are being processed
        if (flag == T_DATA)
        {
                sptr += ofile->o_header.tsize;              // Start of DATA segment
                rptr += ofile->o_header.absrel.reloc.tsize; // Start of DATA relocation records
                relocsize = ofile->o_header.absrel.reloc.dsize;
        }

        // Process each relocation record for the TEXT segment
        for(i=0; i<(int)relocsize; i+=8)
        {
                // Obtain both the relocation address and the relocation flags from the
                // object file image
                addr = GetLong(rptr);
                rflg = GetLong(rptr + 4);
                glblreloc = (rflg & BSDREL_GLOBAL ? 1 : 0);
                absreloc  = (rflg & BSDREL_ABS ? 1 : 0);
                relreloc  = (rflg & BSDREL_PCREL ? 1 : 0);
                wordreloc = (rflg & BSDREL_WORD ? 1 : 0);
                opreloc   = (rflg & BSDREL_OP ? 1 : 0);

                // Additional processing required for global relocations
                if (glblreloc)
                {
                        // Obtain the string table index for the relocation symbol, look
                        // for it in the globals hash table to obtain information on that
                        // symbol. For the hash calculation to work correctly it must be
                        // placed in a 'clean' string before looking it up.
                        symidx = GetLong(symtab + (BSDREL_SYMIDX(rflg) * 12));
                        memset(sym, 0, SYMLEN);
                        strcpy(sym, symbols + symidx);
                        olddata = newdata = 0;   // Initialise old and new segment data
                        ssidx = OSTLookup(sym);
                        newdata = GetLong(ost + ((ssidx - 1) * 12) + 8);
                }

                // Obtain the existing long word (or word) segment data and flip words
                // if the relocation flags indicate it relates to a RISC MOVEI
                // instruction
                olddata = (wordreloc ? GetWord(sptr + addr) : GetLong(sptr + addr));

                // If it's a OP QUAD relocation, get the data out of the DATA bits.
                // Note that because we can't afford to lose the bottom 3 bits of the
                // relocation record, we lose 3 off the top--which means the maximum
                // this can store is $1FFFF8 (vs. $FFFFF8).
                if (opreloc)
                {
                        saveBits2 = (GetLong(sptr + addr + 8) & 0xE0000000) >> 8; // Upper 3 of data addr
                        saveBits = olddata & 0x7FF;
                        olddata = (olddata & 0xFFFFF800) >> 11;
                        olddata |= saveBits2; // Restore upper 3 bits of data addr
                }

                if (rflg & BSDREL_MOVEI)
                        olddata = _SWAPWORD(olddata);

                // Process record dependant on segment it relates to; TEXT, DATA or
                // BSS. Construct a new relocated segment long word based on the
                // required segment base address, the segment data offset in the
                // resulting COF file and the offsets from the incoming object file.
                swcond = (rflg & BSDREL_SEGMASK);

                if (!glblreloc)
                {
                        switch (swcond)
                        {
                        case BSDREL_SEG_ABS:
                                break;
                        case BSDREL_SEG_TEXT:
                                // SCPCD : the symbol point to a text segment, we should use the textoffset
                                newdata = tbase + textoffset + olddata;

                                break;
                        case BSDREL_SEG_DATA:
                                newdata = dbase + dataoffset
                                        + (olddata - ofile->o_header.tsize);

                                break;
                        case BSDREL_SEG_BSS:
                                newdata = bbase + bssoffset
                                        + (olddata - (ofile->o_header.tsize
                                        + ofile->o_header.dsize));

                                break;
                        }
                }
                else
                {
                        if (!relreloc)
                                newdata += olddata;
                }

                // Set absolute (long) or relative (word) address of symbol
                if (absreloc)
                {
                        // Flip the new long word segment data if the relocation record
                        // indicated a RISC MOVEI instruction and place the resulting data
                        // back in the COF segment
                        if (rflg & BSDREL_MOVEI)
                                newdata = _SWAPWORD(newdata);

                        if (wordreloc)
                                PutWord(sptr + addr, newdata);
                        else if (opreloc)
                        {
                                if (vflag > 1)
                                        printf("OP reloc: oldata=$%X, newdata=$%X\n", olddata, newdata);

                                newdata = ((newdata & 0x00FFFFF8) << 8) | saveBits;
                                PutLong(sptr + addr, newdata);
                                // Strip out extraneous data hitchhikers from 2nd phrase...
                                newdata = GetLong(sptr + addr + 8) & 0x007FFFFF;
                                PutLong(sptr + addr + 8, newdata);
                        }
                        else
                                PutLong(sptr + addr, newdata);
                }
                else if (relreloc)
                {
                        PutWord(sptr + addr, newdata - tbase - addr - ofile->o_tbase);
                }

                // Shamus: Let's output some info to aid in debugging this crap
                if (vflag > 1)
                {
                        char ssiString[128];
                        ssiString[0] = 0;

                        if (glblreloc)
                                sprintf(ssiString, " [ssi:%i]", ssidx);

                        printf("RelocateSegment($%08X): %s, $%08X: $%08X => $%08X%s\n", rflg, (glblreloc ? sym : "(LOCAL)"), addr, olddata, GetLong(sptr + addr), ssiString);
                }

                rptr += 8;     // Point to the next relocation record
        }

        // Update the COF segment offset allowing for the phrase padding.
        // SCPCD : we should not increment the textoffset before the end of processing the object file, else data section will point to wrong textoffset
        if (flag == T_DATA)
        {
                // TEXT segment plus padding
                pad = ((ofile->o_header.tsize + secalign) & ~secalign);
                textoffset += (ofile->o_header.tsize + (pad - ofile->o_header.tsize));

                // DATA segment plus padding
                pad = ((ofile->o_header.dsize + secalign) & ~secalign);
                dataoffset += (ofile->o_header.dsize + (pad - ofile->o_header.dsize));

                // BSS segment plus padding
                pad = ((ofile->o_header.bsize + secalign) & ~secalign);
                bssoffset += (ofile->o_header.bsize + (pad - ofile->o_header.bsize));
        }

        // Return value, should always be zero
        return 0;
}


//
// Add a path character to the end of string 's' if it doesn't already end with
// one. The last occurrance of '/' or '\' in the string is assumed to be the
// path character.
//
// This is fucking shit. We know what the path delimiter is, its FUCKING
// DEFINED IN THE FUCKING HEADER. FOR FUCKS SAKE. AND YES, HOPE TO GOD THERE'S
// ENOUGH SPACE IN THE PASSED IN BUFFER TO HOLD THE EXTRA CHARACTER!
//
void AppendPathDelimiter(char * s)
{
#if 0
        // And hope to God that there's enough space in the buffer...
        char pathchar = 0;

        while (*s)
        {
                if (*s == '/' || *s == '\\')
                        pathchar = *s;

                s++;
        }

        s--;

        if (*s == pathchar)
                return;

        *++s = pathchar;
        *++s = 0;
#else
        int length = strlen(s);

        if (s[length - 1] != PATH_DELIMITER)
        {
                s[length] = PATH_DELIMITER;
                s[length + 1] = 0;      // BUFFER OVERFLOW!!!! FFFFFFFFUUUUUUUUUUUU
        }
#endif
}


//
// Try to open "name", "name.o", "${libdir}name", "${libdir}name.o". Return the
// handle of the file successfully opened. p_name is updated to point to a
// malloc()'ed string which is the name which actually got opened. p_name will
// return unchanged if the file can't be found.
//
int TryOpenFile(char ** p_name)
{
        char * name = *p_name;

        // Note that libdir will be an empty string if there is none specified
        char * tmpbuf = malloc(strlen(name) + strlen(libdir) + 3);

        if (tmpbuf == NULL)
        {
                printf("TryOpenFile() : out of memory\n");
                return -1;
        }

        strcpy(tmpbuf, name);
        int hasdot = (strrchr(tmpbuf, '.') > strrchr(tmpbuf, PATH_DELIMITER));
        // Try to open file as passed first
        int fd = open(tmpbuf, _OPEN_FLAGS);

        if (fd >= 0)
                goto ok;

        if (!hasdot)
        {
                // Try to open file with '.o' added
                strcat(tmpbuf, ".o");
                fd = open(tmpbuf, _OPEN_FLAGS);

                if (fd >= 0)
                        goto ok;
        }

        // Try the libdir only if the name isn't already anchored
        // Shamus: WTH, this makes no sense... Why the ':'? Is this a Macintosh??
//      if (*name != '/' && *name != '\\' && !strchr(name, ':'))
        if ((*name != PATH_DELIMITER) && (strchr(name, ':') == NULL))
        {
                strcpy(tmpbuf, libdir);
                // Add a trailing path char if there isn't one already
                AppendPathDelimiter(tmpbuf);
                strcat(tmpbuf, name);

                if ((fd = open(tmpbuf, _OPEN_FLAGS)) >= 0)
                        goto ok;

                if (!hasdot)
                {
                        strcat(tmpbuf, ".o");

                        if ((fd = open(tmpbuf, _OPEN_FLAGS)) >= 0)
                                goto ok;
                }
        }

        // Couldn't open file at all
        return -1;

// There are worse things... :-P
ok:
        tmpbuf = realloc(tmpbuf, strlen(tmpbuf) + 1);

        if (tmpbuf == NULL)
        {
                printf("TryOpenFile() : out of memory\n");
                return -1;
        }

        *p_name = tmpbuf;
        return fd;
}


//
// What it says on the tin
//
void WriteARName(struct OFILE * p)
{
        int flag = *(p->o_arname);
        printf("%s%s%s", (flag ? (char *)(p->o_arname) : ""), (flag ? ":" : ""), p->o_name);
}


//
// Collect file names and handles in a buffer so there is less disk activity.
// Call DoFile with flag FALSE for normal object files and archives.
// Call it with flag TRUE and a symbol name for include files (-i).
//
int DoFile(char * fname, int incFlag, char * sym)
{
        // Verbose information
        if (vflag)
        {
                printf("DoFile() : `%s' %s", fname, incFlag ? "INCLUDE" : "NORMAL");

                if (incFlag)
                        printf(" symbol %s", sym);

                printf("\n");
        }

        // Reached maximum file handles
        if (hd == NHANDLES)
        {
                if (ProcessFiles())
                        return 1;
        }

        // Attempt to open input file
        int fd = TryOpenFile(&fname);

        if (fd < 0)
        {
                printf("Cannot find input module %s\n", fname);
                return 1;
        }

        // The file is open; save its info in the handle and name arrays
        handle[hd] = fd;
        name[hd] = fname;               // This is the name from TryOpenFile()
        hflag[hd] = incFlag;

        // Include files
        if (incFlag)
        {
                int temp = strlen(sym);         // Get symbol length

                // 100 chars is max length of a symbol
                if (temp > 99)
                {
                        sym[99] = '\0';
                        temp = 99;
                }

                // Malloc enough space for two symbols, then build the second one.
                // Second one may be one character longer than first
                if ((hsym1[hd] = malloc((long)temp + 1)) == NULL
                        || (hsym2[hd] = malloc((long)temp + 2)) == NULL)
                {
                        printf("DoFile() : out of memory for include-file symbols\n");
                        return 1;
                }

                strcpy(hsym1[hd], sym);
                strcpy(hsym2[hd], sym);

                if (temp == 99)
                {
                        if (sym[99] == 'x')
                        {
                                printf("Last char of %s is already 'x': choose another name\n", sym);
                                return 1;
                        }

                        hsym2[hd][99] = 'x';
                }
                else
                {
                        hsym2[hd][temp] = 'x';
                        hsym2[hd][temp+1] = '\0';
                }
        }

        // Increment next handle index
        hd++;
        // No problems
        return 0;
}


//
// Pad TEXT or DATA segment to the requested boundary
//
int PadSegment(FILE * fd, long segsize, int value)
{
        int i;
        char padarray[32];
        char * padptr;

        // Determine the number of padding bytes that are needed
        long padsize = (segsize + secalign) & ~secalign;
        padsize = padsize - segsize;

        // Fill pad array if padding is required
        if (padsize)
        {
                padptr = padarray;

                for(i=0; i<16; i++)
                {
                        PutWord(padptr, value);
                        padptr += 2;
                }

                symoffset += padsize;

                // Write padding bytes
                if (fwrite(padarray, padsize, 1, fd) != 1)
                        return 1;
        }

        return 0;
}


//
// Write the output file
//
int WriteOutputFile(struct OHEADER * header)
{
        unsigned osize;                                         // Object segment size
        struct OFILE * otemp;                           // Object file pointer
        int i, j;                                                       // Iterators
        char himage[0x168];                                     // Header image (COF = 0xA8)
        uint32_t tsoff, dsoff, bsoff;           // Segment offset values
        unsigned index, type, value;            // Symbol table index, type and value
        short abstype;                                          // ABS symbol type
        char symbol[14];                                        // Symbol record for ABS files
        int slen;                                                       // Symbol string length

        symoffset = 0;                                          // Initialise symbol offset

        // Add correct output extension if none
        if (strchr(ofile, '.') == NULL)
        {
                if (aflag && cflag)
                        strcat(ofile, ".cof");          // COF files (a type of abs)
                else if (aflag && !cflag)
                        strcat(ofile, ".abs");          // ABS files
                else
                        strcat(ofile, ".o");            // Object files (partial linking, etc)
        }

        FILE * fd = fopen(ofile, "wb");         // Attempt to open output file

        if (!fd)
        {
                printf("Can't open output file %s\n", ofile);
                return 1;
        }

        // Build the output file header
        // Absolute (COF) header
        if (cflag)
        {
                tsoff = dsoff = bsoff = 0xA8;   // Initialises segment offsets

                // Process each object file segment size to obtain a cumulative segment
                // size for both the TEXT and DATA segments
                for(otemp=olist; otemp!=NULL; otemp=otemp->o_next)
                {
                        dsoff += otemp->segSize[TEXT];
                        bsoff += otemp->segSize[TEXT] + otemp->segSize[DATA];
                }

                // Currently this only builds a COF absolute file. Conditionals and
                // additional code will need to be added for ABS and partial linking.

                // Build the COF_HDR
                PutWord(himage + 0,   0x0150               ); // Magic Number (0x0150)
                PutWord(himage + 2,   0x0003               ); // Sections Number (3)
                PutLong(himage + 4,   0x00000000           ); // Date (0L)
                PutLong(himage + 8,   dsoff + header->dsize); // Offset to Symbols Section
                PutLong(himage + 12,  ost_index);             // Number of Symbols
                PutWord(himage + 16,  0x001C               ); // Size of RUN_HDR (0x1C)
                PutWord(himage + 18,  0x0003               ); // Executable Flags (3)

                // Build the RUN_HDR
                PutLong(himage + 20,  0x00000107           ); // Magic/vstamp
                PutLong(himage + 24,  header->tsize        ); // TEXT size in bytes
                PutLong(himage + 28,  header->dsize        ); // DATA size in bytes
                PutLong(himage + 32,  header->bsize        ); // BSS size in bytes
                PutLong(himage + 36,  tbase                ); // Start of executable, normally @TEXT
                PutLong(himage + 40,  tbase                ); // @TEXT
                PutLong(himage + 44,  dbase                ); // @DATA

                // Build the TEXT SEC_HDR
                PutLong(himage + 48,  0x2E746578           );
                PutLong(himage + 52,  0x74000000           ); // ".text"
                PutLong(himage + 56,  tbase                ); // TEXT START
                PutLong(himage + 60,  tbase                ); // TEXT START
                PutLong(himage + 64,  header->tsize        ); // TEXT size in bytes
                PutLong(himage + 68,  tsoff                ); // Offset to section data in file
                PutLong(himage + 72,  0x00000000           ); // Offset to section reloc in file (0L)
                PutLong(himage + 76,  0x00000000           ); // Offset to debug lines structures (0L)
                PutLong(himage + 80,  0x00000000           ); // Nreloc/nlnno (0L)
                PutLong(himage + 84,  0x00000020           ); // SEC_FLAGS: STYP_TEXT

                // Build the DATA SEC_HDR
                PutLong(himage + 88,  0x2E646174           );
                PutLong(himage + 92,  0x61000000           ); // ".data"
                PutLong(himage + 96,  dbase                ); // DATA START
                PutLong(himage + 100, dbase                ); // DATA START
                PutLong(himage + 104, header->dsize        ); // DATA size in bytes
                PutLong(himage + 108, dsoff                ); // Offset to section data in file
                PutLong(himage + 112, 0x00000000           ); // Offset to section reloc in file (0L)
                PutLong(himage + 116, 0x00000000           ); // Offset to debugging lines structures (0L)
                PutLong(himage + 120, 0x00000000           ); // Nreloc/nlnno (0L)
                PutLong(himage + 124, 0x00000040           ); // SEC_FLAGS: STYP_DATA

                // Build the BSS SEC_HDR
                PutLong(himage + 128, 0x2E627373           );
                PutLong(himage + 132, 0x00000000           ); // ".bss"
                PutLong(himage + 136, bbase                ); // BSS START
                PutLong(himage + 140, bbase                ); // BSS START
                PutLong(himage + 144, header->bsize        ); // BSS size in bytes
                PutLong(himage + 148, bsoff                ); // Offset to section data in file
                PutLong(himage + 152, 0x00000000           ); // Offset to section reloc in file (0L)
                PutLong(himage + 156, 0x00000000           ); // Offset to debugging lines structures (0L)
                PutLong(himage + 160, 0x00000000           ); // Nreloc/nlnno (0L)
                PutLong(himage + 164, 0x00000080           ); // SEC_FLAGS: STYP_BSS

                symoffset = 168;                              // Update symbol offset
        }
        // Absolute (ABS) header
        else
        {
                // Build the ABS header
                PutWord(himage + 0,   0x601B               ); // Magic Number (0x601B)
                PutLong(himage + 2,   header->tsize        ); // TEXT segment size
                PutLong(himage + 6,   header->dsize        ); // DATA segment size
                PutLong(himage + 10,  header->bsize        ); // BSS segment size
                PutLong(himage + 14,  ost_index * 14       ); // Symbol table size (?)
                PutLong(himage + 18,  0x00000000           ); //
                PutLong(himage + 22,  tbase                ); // TEXT base address
                PutWord(himage + 26,  0xFFFF               ); // Flags (?)
                PutLong(himage + 28,  dbase                ); // DATA base address
                PutLong(himage + 32,  bbase                ); // BSS base address

                symoffset = 36;                               // Update symbol offset
        }

        // Write the header, but not if noheaderflag
        if (!noheaderflag)
        {
                // Absolute (ABS) header
                if (!cflag)
                {
                        if (fwrite(himage, 36, 1, fd) != 1)
                                goto werror;
                }
                // Absolute (COF) header
                else
                {
                        if (fwrite(himage, 168, 1, fd) != 1)
                                goto werror;
                }
        }

        // Write the TEXT segment of each object file
        for(otemp=olist; otemp!=NULL; otemp=otemp->o_next)
        {
                osize = otemp->o_header.tsize;

                // Write only if segment has size
                if (osize)
                {
                        if (vflag > 1)
                                printf("Writing TEXT Segment of %s\n", otemp->o_name);

                        if (fwrite(otemp->o_image + 32, osize, 1, fd) != 1)
                                goto werror;

                        // Pad to required alignment boundary
                        if (PadSegment(fd, osize, 0x0000))
                                goto werror;

                        symoffset += osize;
                }
        }

        // Write the DATA segment of each object file
        for(otemp=olist; otemp!=NULL; otemp=otemp->o_next)
        {
                osize = otemp->o_header.dsize;

                // Write only if the segment has size
                if (osize)
                {
                        if (vflag > 1)
                                printf("Writing DATA Segment of %s\n", otemp->o_name);

                        if (fwrite((otemp->o_image + 32 + otemp->o_header.tsize), osize, 1, fd) != 1)
                                goto werror;

                        // Pad to required alignment boundary
                        if (PadSegment(fd, osize, 0))
                                goto werror;

                        symoffset += osize;
                }
        }

//wha?  if (!noheaderflag)
        // This isn't quite right, but it's closer...
        // (the l and s flags tell the linker to output local & global symbols
        //  in the symbol table, so it seems there's some other thing that's a
        // default set somewhere. Not 100% sure. Setting -s kills -l, BTW...)
        if (lflag || sflag)
        {
                // Write the symbols table and string table
                // Absolute (COF) symbol/string table
                if (cflag)
                {
                        if (header->ssize)
                        {
                                if (fwrite(ost, (ost_ptr - ost), 1, fd) != 1)
                                        goto werror;

                                if (fwrite(oststr, (oststr_ptr - oststr), 1, fd) != 1)
                                        goto werror;
                        }
                }
                // Absolute (ABS) symbol/string table
                else
                {
                        // The symbol and string table have been created as part of the
                        // DoSymbols() function and the output symbol and string tables are
                        // in COF format. For an ABS file we need to process through this
                        // to create the 14 character long combined symbol and string
                        // table. Format of symbol table in ABS: AAAAAAAATTVVVV, where
                        // (A)=STRING, (T)=TYPE & (V)=VALUE

                        for(i=0; i<ost_index; i++)
                        {
                                memset(symbol, 0, 14);          // Initialise symbol record
                                abstype = 0;                            // Initialise ABS symbol type
                                slen = 0;                                       // Initialise symbol string length
                                index = GetLong(ost + (i * 12));        // Get symbol index
                                type  = GetLong((ost + (i * 12)) + 4);  // Get symbol type

                                // Skip debug symbols
                                if (type & 0xF0000000)
                                        continue;

                                // Get symbol value
                                value = GetLong((ost + (i * 12)) + 8);
                                slen = strlen(oststr + index);

                                // Get symbol string (maximum 8 chars)
                                if (slen > 8)
                                {
                                        for(j=0; j<8; j++)
                                                *(symbol + j) = *(oststr + index + j);
                                }
                                else
                                {
                                        for(j=0; j<slen; j++)
                                                *(symbol + j) = *(oststr + index + j);
                                }

                                // Modify to ABS symbol type
                                switch (type)
                                {
                                case 0x02000000: abstype = (short)ABST_DEFINED;                           break;
                                case 0x04000000: abstype = (short)ABST_DEFINED | ABST_TEXT;               break;
                                case 0x05000000: abstype = (short)ABST_DEFINED | ABST_GLOBAL | ABST_TEXT; break;
                                case 0x06000000: abstype = (short)ABST_DEFINED | ABST_DATA;               break;
                                case 0x07000000: abstype = (short)ABST_DEFINED | ABST_GLOBAL | ABST_DATA; break;
                                case 0x08000000: abstype = (short)ABST_DEFINED | ABST_BSS;                break;
                                case 0x09000000: abstype = (short)ABST_DEFINED | ABST_GLOBAL | ABST_BSS;  break;
                                default:
                                        printf("warning (WriteOutputFile): ABS, cannot determine symbol type ($%08X) [%s]\n", type, symbol);
//                                      type = 0;
                                        break;
                                }

                                PutWord(symbol + 8, abstype);   // Write back new ABS type
                                PutLong(symbol + 10, value);    // Write back value

                                // Write symbol record
                                if (fwrite(symbol, 14, 1, fd) != 1)
                                        goto werror;
                        }
                }
        }

        if (fclose(fd))
        {
                printf("Close error on output file %s\n", ofile);
                return 1;
        }

        return 0;

werror:
        printf("Write error on output file %s\n", ofile);
        fclose(fd);                     // Try to close output file anyway
        return 1;
}


//
// Display the symbol load map
//
int ShowSymbolLoadMap(struct OHEADER * header)
{
        unsigned i, o;                  // Inner and outer loop iterators
        unsigned c;                             // Column number
        unsigned index;                 // Symbol string index
        unsigned type;                  // Symbol type
        unsigned value;                 // Symbol value
        char * symbol;                  // Symbol string value

        if (ost_index == 0)
                return 0;                       // Return if no symbols to map

        printf("LOAD MAP\n\n");

        // Outer loop for each of the symbol areas to map out;
        // 0 = NON-RELOCATABLE SYMBOLS
        // 1 = TEXT-SEGMENT RELOCATABLE SYMBOLS
        // 2 = DATA-SEGMENT RELOCATABLE SYMBOLS
        // 3 = BSS-SEGMENT RELOCATABLE SYMBOLS
        for(o=0; o<4; o++)
        {
                // Display the correct map header for the symbols being processed
                switch (o)
                {
                case 0: printf("NON-RELOCATABLE SYMBOLS\n\n");          break;
                case 1: printf("TEXT-SEGMENT RELOCATABLE SYMBOLS\n\n"); break;
                case 2: printf("DATA-SEGMENT RELOCATABLE SYMBOLS\n\n"); break;
                case 3: printf("BSS-SEGMENT RELOCATABLE SYMBOLS\n\n");  break;
                }

                c = 0;                          // Initialise column number

                // Inner loop to process each record in the symbol table
                for(i=0; i<(unsigned)ost_index; i++)
                {
                        index  = GetLong(ost + (i * 12));               // Get symbol string index
                        type   = GetLong(ost + (i * 12) + 4);   // Get symbol type
                        value  = GetLong(ost + (i * 12) + 8);   // Get symbol value
                        symbol = oststr + index;                                // Get symbol string

                        // Display only three columns
                        if (c == 3)
                        {
                                printf("\n");
                                c = 0;
                        }

                        // If local symbols not included and the type is local then go to
                        // next symbol record
                        if (!lflag & !(type & 0x01000000))
                                continue;

                        // Output each symbol to the display, dependant on type
                        switch (o)
                        {
                        case 0:
                                // Non-relocatable symbols
                                if (type == 0x02000000 || type == 0x03000000)
                                {
                                        printf("%-8s %c  %08X   ", symbol, (type & 0x01000000) ? 'G' : 'L', value);
                                        c++;
                                }

                                break;
                        case 1:
                                // TEXT segment relocatable symbols
                                if (type == 0x04000000 || type == 0x05000000)
                                {
                                        printf("%-8s %c  %08X   ", symbol, (type & 0x01000000) ? 'G' : 'L', value);
                                        c++;
                                }

                                break;
                        case 2:
                                // DATA segment relocatble symbols
                                if (type == 0x06000000 || type == 0x07000000)
                                {
                                        printf("%-8s %c  %08X   ", symbol, (type & 0x01000000) ? 'G' : 'L', value);
                                        c++;
                                }

                                break;
                        case 3:
                                // BSS segment relocatable symbols
                                if (type == 0x08000000 || type == 0x09000000)
                                {
                                        printf("%-8s %c  %08X   ", symbol, (type & 0x01000000) ? 'G' : 'L', value);
                                        c++;
                                }

                                break;
                        }
                }

                printf("\n\n");
        }

        return 0;
}


//
// Stuff the (long) value of a string into the value argument. RETURNS TRUE if
// the string doesn't parse.  Parses only as a hexadecimal string.
//
int GetHexValue(char * string, int * value)
{
        *value = 0;

        while (isxdigit(*string))
        {
                if (isdigit(*string))
                {
                        *value = (*value << 4) + (*string++ - '0');
                }
                else
                {
                        if (isupper(*string))
                                *string = tolower(*string);

                        *value = (*value << 4) + ((*string++ - 'a') + 10);
                }
        }

        if (*string != '\0')
        {
                printf("Invalid hexadecimal value");
                return 1;
        }

        return 0;
}


//
// Create one big .o file from the images already in memory, returning a
// pointer to an OHEADER. Note that the oheader is just the header for the
// output (plus some other information). The text, data, and fixups are all
// still in the ofile images hanging off the global 'olist'.
//
struct OHEADER * MakeOutputObject()
{
        unsigned tptr, dptr, bptr;      // Bases in runtime model
        int ret = 0;                            // Return value
        struct OHEADER * header;        // Output header pointer

        // Initialize cumulative segment sizes
        textsize = datasize = bsssize = 0;

        // For each object file, accumulate the sizes of the segments but remove
        // those object files which are unused
        struct OFILE * oprev = NULL;    // Init previous obj file list ptr
        struct OFILE * otemp = olist;   // Set temp pointer to object file list

        while (otemp != NULL)
        {
                // If the object is unused, discard it...
                if ((otemp->o_flags & O_USED) == 0)
                {
                        if (wflag)
                        {
                                printf("Unused object file ");
                                WriteARName(otemp);
                                printf(" discarded.\n");
                        }

                        // Drop the entry from the linked list
                        if (oprev == NULL)
                                olist = otemp->o_next;
                        else
                                oprev->o_next = otemp->o_next;

                        // Free the object entry if it's not an archive file
                        if (!otemp->isArchiveFile)
                                free(otemp->o_image);
                }
                else
                {
                        // Save accumulated addresses in the object
                        otemp->segBase[TEXT] = textsize;
                        otemp->segBase[DATA] = datasize;
                        otemp->segBase[BSS]  = bsssize;

                        // Increment total of segment sizes ensuring requested alignment
                        textsize += (otemp->o_header.tsize + secalign) & ~secalign;
                        datasize += (otemp->o_header.dsize + secalign) & ~secalign;
                        bsssize  += (otemp->o_header.bsize + secalign) & ~secalign;
                        oprev = otemp;
                }

                // Go to next object file list pointer
                otemp = otemp->o_next;
        }

        // Update base addresses and inject the symbols _TEXT_E, _DATA_E and _BSS_E
        // into the OST
        tbase = tval;

        if (!dval)
        {
                // DATA follows TEXT
                dbase = tval + textsize;

                if (!bval)
                        // BSS follows DATA
                        bbase = tval + textsize + datasize;
                else
                        // BSS is independent of DATA
                        bbase = bval;
        }
        else
        {
                // DATA is independent of TEXT
                dbase = dval;

                if (!bval)
                {
                        if (btype == -2)
                                // BSS follows TEXT
                                bbase = tval +  textsize;
                        else
                                // BSS follows DATA
                                bbase = dval + datasize;
                }
                else
                {
                        // BSS is independent of DATA
                        bbase = bval;
                }
        }

        // Inject segment end labels, for C compilers that expect this shite
        OSTAdd("_TEXT_E", 0x05000000, tbase + textsize);
        OSTAdd("_DATA_E", 0x07000000, dbase + datasize);
        OSTAdd("_BSS_E",  0x09000000, bbase + bsssize);

        // Place each unresolved symbol in the output symbol table
        // N.B.: It only gets here to do this if user passes in -u flag
        //       [Only used here, once]
        if (DoUnresolved())
                return NULL;

        // Initialise base addresses
        tptr = dptr = bptr = 0;

        // For each file, relocate its symbols and add them to the output symbol
        // table
        otemp = olist;
        oprev = NULL;

        while (otemp != NULL)
        {
                otemp->o_tbase = tptr;
                otemp->o_dbase = dptr;
                otemp->o_bbase = bptr;
                tptr += (otemp->o_header.tsize + secalign) & ~secalign;
                dptr += (otemp->o_header.dsize + secalign) & ~secalign;
                bptr += (otemp->o_header.bsize + secalign) & ~secalign;

                // For each symbol, (conditionally) add it to the ost
                // For ARCHIVE markers, this adds the symbol for the file & returns
                // (Shamus: N.B. it does no such thing ATM)
                // [Only used here, once]
                if (DoSymbols(otemp))
                        return NULL;

                oprev = otemp;
                otemp = otemp->o_next;
        }

        // Places all the externs, globals etc into the output symbol table
        if (DoCommon() == -1)
                return NULL;

        // Create a new output file header
        header = new_oheader();

        if (header == NULL)
        {
                printf("MakeOutputObject: out of memory!\n");
                return NULL;
        }

        // Fill in the output header. Does not match the actual output but values
        // used as reference
        header->magic = 0x0150;                         // COF magic number
        header->tsize = textsize;                       // TEXT segment size
        header->dsize = datasize;                       // DATA segment size
        header->bsize = bsssize;                        // BSS segment size
        header->ssize = (ost_ptr - ost);        // Symbol table size
        header->ostbase = ost;                          // Output symbol table base address

        // For each object file, relocate its TEXT and DATA segments. OR the result
        // into ret so all files get moved (and errors reported) before returning
        // with the error condition
        for(otemp=olist; otemp!=NULL; otemp=otemp->o_next)
        {
                ret |= RelocateSegment(otemp, T_TEXT); // TEXT segment relocations
                ret |= RelocateSegment(otemp, T_DATA); // DATA segment relocations
        }

        // Done with global symbol hash tables
        FreeHashes();

        return (ret ? (struct OHEADER *)NULL : header);
}


//
// Add symbol to hash list
//
int AddSymbolToHashList(struct HREC ** hptr, char * sym, struct OFILE * ofile,
        long value, int type)
{
        struct HREC * htemp = new_hrec();

        if (htemp == NULL)
        {
                printf("Out of memory\n");
                return 1;
        }

        // Shamus: Moar testing...
        if (vflag > 1)
        {
                printf("AddSymbolToHashList(): hptr=$%08X, sym=\"%s\", ofile=$%08X, value=$%X, type=$%X\n", hptr, sym, ofile, value, type);
        }

        // Populate hash record
        memset(htemp->h_sym, 0, SYMLEN);
        strcpy(htemp->h_sym, sym);
        htemp->h_ofile = ofile;
        htemp->h_value = value;
        htemp->h_type = type;

        // Add new hash to the front of the list (hence the ** for hptr)
        htemp->h_next = *hptr;
        *hptr = htemp;

        return 0;
}


//
// Add symbol to the unresolved symbols hash table (really, it's a linked list)
//
int AddUnresolvedSymbol(char * sym, struct OFILE * ofile)
{
        if (vflag > 1)
                printf("AddUnresolvedSymbol(%s, %s)\n", sym, ofile->o_name);

        return AddSymbolToHashList(&unresolved, sym, ofile, 0L, 0);
}


//
// Remove the HREC from the unresolved symbol list, and pass back a pointer
// to the spot where the HREC was.
//
struct HREC * RemoveUnresolvedSymbol(struct HREC * hrec)
{
        struct HREC * ptr = unresolved;
        struct HREC * previous = NULL;

        while ((ptr != hrec) && (ptr != NULL))
        {
                previous = ptr;
                ptr = ptr->h_next;
        }

        // Not found...!
        if (ptr == NULL)
                return NULL;

        struct HREC * next = ptr->h_next;

        // Remove the head if nothing previous, otherwise, remove what we found
        if (previous == NULL)
                unresolved = next;
        else
                previous->h_next = next;

        free(ptr);
        return next;
}


//
// Add symbol to the unresolved symbols hash table
//
int AddARSymbol(char * sym, struct OFILE * ofile)
{
        if (vflag > 1)
                printf("AddARSymbol(%s, %s)\n", sym, ofile->o_name);

        return AddSymbolToHashList(&arSymbol, sym, ofile, 0L, 0);
}


//
// Generate hash value from the 1st 15 characters of the symbol modulo the
// number of buckets in the hash.
//
int GetHash(char * s)
{
        // For this to be consistent, the symbol MUST be zeroed out beforehand!
        // N.B.: strncpy() pads zeroes for us, if the symbol is less than 15 chars.
        char c[15];
        strncpy(c, s, 15);

        int i = (c[0] + c[1] + c[2] + c[3] + c[4] + c[5] + c[6] + c[7] + c[8]
                + c[9] + c[10] + c[11] + c[12] + c[13] + c[14]) % NBUCKETS;
        return i;
}


//
// Lookup a symbol in the hash table.
// Returns either a pointer to the HREC or NULL if not found.
//
struct HREC * LookupHREC(char * symbol)
{
        struct HREC * hptr = htable[GetHash(symbol)];

        while (hptr != NULL)
        {
//This is utter failure...
//              if (symcmp(symbol, hptr->h_sym))  <-- left here for giggles :D  - LinkoVitch
                // Return hash record pointer if found
                if (strcmp(symbol, hptr->h_sym) == 0)
                        return hptr;

                hptr = hptr->h_next;
        }

        return NULL;
}


//
// Lookup a symbol in the AR symbol table.
// Returns either a pointer to the HREC or NULL if not found.
//
struct HREC * LookupARHREC(char * symbol)
{
        struct HREC * hptr = arSymbol;

        while (hptr != NULL)
        {
                // Return hash record pointer if found
                if (strcmp(symbol, hptr->h_sym) == 0)
                        return hptr;

                hptr = hptr->h_next;
        }

        return NULL;
}


//
// Add the imported symbols from this file to unresolved, and the global and
// common (???) symbols to the exported hash table.
//
// Change old-style commons (type == T_EXTERN, value != 0) to new-style ones
// (type == (T_GLOBAL | T_EXTERN)). [??? O_o]
// [N.B.: Whoever wrote the above didn't know what the fuck they were talking
//        about. Commons (globals) are exactly what they are calling 'old
//        style'. Also note, that there is no "T_GLOBAL" or "T_EXTERN" symbols
//        defined anywhere in the code.]
//
int AddSymbols(struct OFILE * Ofile)
{
        struct HREC * hptr;                     // Hash record pointer

        if (vflag > 1)
        {
                printf("AddSymbols: for file %s\n", Ofile->o_name);
                printf("            t_bbase = $%X\n", Ofile->o_tbase);
                printf("            d_bbase = $%X\n", Ofile->o_dbase);
                printf("            o_bbase = $%X\n", Ofile->o_bbase);
                printf("            tsize = $%X\n", Ofile->o_header.tsize);
                printf("            dsize = $%X\n", Ofile->o_header.dsize);
                printf("            bsize = $%X\n", Ofile->o_header.bsize);
                printf("            reloc.tsize = $%X\n", Ofile->o_header.absrel.reloc.tsize);
                printf("            reloc.dsize = $%X\n", Ofile->o_header.absrel.reloc.dsize);
        }

        // Get base pointer, start of sym fixups
        char * ptr = Ofile->o_image + 32
                + Ofile->o_header.tsize
                + Ofile->o_header.dsize
                + Ofile->o_header.absrel.reloc.tsize
                + Ofile->o_header.absrel.reloc.dsize;
        char * sfix = ptr;                                                      // Set symbol fixup pointer
        char * sstr = sfix + Ofile->o_header.ssize;     // Set symbol table pointer
        long nsymbols = Ofile->o_header.ssize / 12;     // Obtain number of symbols

        while (nsymbols)
        {
                long index = GetLong(sfix);                             // Get symbol string index
                long type  = GetLong(sfix + 4);                 // Get symbol type
                long value = GetLong(sfix + 8);                 // Get symbol value

                if ((Ofile->isArchiveFile) && !(Ofile->o_flags & O_USED))
                {
                        if ((type & T_GLBL) && (type & (T_SEG | T_ABS)))
                                if (AddARSymbol(sstr + index, Ofile))
                                        return 1;
                }
                else if (type == T_GLBL)
                {
                        // Global symbol that may or may not be in the current unit
                        hptr = LookupHREC(sstr + index);

                        if (hptr != NULL)
                                hptr->h_ofile->o_flags |= O_USED;       // Mark .o file as used
                        // Otherwise, *maybe* add to unresolved list
                        else
                        {
                                // Check to see if this is a common symbol; if so, add it to
                                // the hash list...
                                if (value != 0)
                                {
                                        // Actually, we need to convert this to a BSS symbol,
                                        // increase the size of the BSS segment for this object, &
                                        // add it to the hash list
                                        uint32_t bssLocation = Ofile->o_header.tsize + Ofile->o_header.dsize + Ofile->o_header.bsize;
                                        Ofile->o_header.bsize += value;
                                        Ofile->segSize[BSS] += value;
                                        type |= T_BSS;
                                        value = bssLocation;
                                        PutLong(sfix + 4, type);
                                        PutLong(sfix + 8, value);

                                        if (vflag > 1)
                                                printf("AddSymbols: Resetting common label to BSS label\n");

                                        if (AddSymbolToHashList(&htable[GetHash(sstr + index)],
                                                sstr + index, Ofile, value, type))
                                                return 1;                               // Error if addition failed
                                }
                                // Make sure it's not a built-in external...
                                else if ((strcmp(sstr + index, "_TEXT_E") != 0)
                                        && (strcmp(sstr + index, "_DATA_E") != 0)
                                        && (strcmp(sstr + index, "_BSS_E") != 0))
                                {
                                        if (AddUnresolvedSymbol(sstr + index, Ofile))
                                                return 1;                               // Error if addition failed
                                }
                        }
                }
                else if ((type & T_GLBL) && (type & (T_SEG | T_ABS)))
                {
                        hptr = LookupHREC(sstr + index);

                        // Symbol isn't in the table, so try to add it:
                        if (hptr == NULL)
                        {
                                if (AddSymbolToHashList(&htable[GetHash(sstr + index)],
                                        sstr + index, Ofile, value, type))
                                        return 1;
                        }
                        else
                        {
                                // Symbol already exists, decide what to do about it
                                // [N.B.: This isn't a check for a common symbol...
                                //        BEWARE OF BAD INTERPRETATIONS!!]
                                if (iscommon(hptr->h_type))
                                {
                                        // Mismatch: common came first; warn and keep the global
                                        if (wflag)
                                        {
                                                printf("Warning: %s: global from ", sstr + index);
                                                WriteARName(Ofile);
                                                printf(" used, common from ");
                                                WriteARName(hptr->h_ofile);
                                                printf(" discarded.\n");
                                        }

                                        hptr->h_ofile = Ofile;
                                        hptr->h_type = type;
                                        hptr->h_value = value;
                                }
                                else
                                {
                                        // Global exported by another ofile; warn and make this one
                                        // extern
                                        if (wflag)
                                        {
                                                printf("Duplicate symbol %s: ", sstr + index);
                                                WriteARName(hptr->h_ofile);
                                                printf(" used, ");
                                                WriteARName(Ofile);
                                                printf(" discarded\n");
                                        }

                                        // Set the global in this unit to pure external
                                        // (is this a good idea? what if the other one is a ref to
                                        // this one???)
                                        PutLong(sfix + 4, T_GLBL);
                                }
                        }
                }

                sfix += 12;                     // Increment symbol fixup pointer
                nsymbols--;                     // Decrement num of symbols to process
        }

        // Success loading symbols
        return 0;
}


//
// Process object file for symbols
//
int DoItem(struct OFILE * obj)
{
        // Allocate memory for object record ptr
        struct OFILE * Ofile = new_ofile();

        if (Ofile == NULL)
        {
                printf("Out of memory while processing %s\n", obj->o_name);
                return 1;
        }

        // Starting after all pathnames, etc., copy .o file name to Ofile
        char * temp = PathTail(obj->o_name);

        // Check filename length
        if (strlen(temp) > FNLEN - 1)
        {
                printf("File name too long: %s\n", temp);
                return 1;
        }

        // Check archive name length
        if (strlen(obj->o_arname) > (FNLEN - 1))
        {
                printf("Archive name too long: %s\n", obj->o_arname);
                return 1;
        }

        strcpy(Ofile->o_name, temp);            // Store filename
        strcpy(Ofile->o_arname, obj->o_arname); // Store archive name

        // Initialise object record information
        Ofile->o_next  = NULL;
        Ofile->o_tbase = 0;
        Ofile->o_dbase = 0;
        Ofile->o_bbase = 0;
        Ofile->o_flags = obj->o_flags;
        Ofile->o_image = obj->o_image;
        Ofile->isArchiveFile = obj->isArchiveFile;
        Ofile->segSize[TEXT] = obj->segSize[TEXT];
        Ofile->segSize[DATA] = obj->segSize[DATA];
        Ofile->segSize[BSS]  = obj->segSize[BSS];
        char * ptr = obj->o_image;

        Ofile->o_header.magic = GetLong(ptr);
        Ofile->o_header.tsize = GetLong(ptr + 4);
        Ofile->o_header.dsize = GetLong(ptr + 8);
        Ofile->o_header.bsize = GetLong(ptr + 12);
        Ofile->o_header.ssize = GetLong(ptr + 16);
        Ofile->o_header.absrel.reloc.tsize = GetLong(ptr + 24);
        Ofile->o_header.absrel.reloc.dsize = GetLong(ptr + 28);

        // Round BSS off to alignment boundary (??? isn't this already done ???)
        Ofile->o_header.bsize = (Ofile->o_header.bsize + secalign) & ~secalign;

        if ((Ofile->o_header.dsize & 7) && wflag)
        {
                printf("Warning: data segment size of ");
                WriteARName(Ofile);
                printf(" is not a phrase multiple\n");
        }

        // Check for odd segment sizes
        if ((Ofile->o_header.tsize & 1) || (Ofile->o_header.dsize & 1)
                || (Ofile->o_header.bsize & 1))
        {
                printf("Error: odd-sized segment in ");
                WriteARName(Ofile);
                printf("; link aborted.\n");
                return 1;
        }

        if (AddSymbols(Ofile))
                return 1;

        // Add this file to the olist
        if (olist == NULL)
                olist = Ofile;
        else
                olast->o_next = Ofile;

        olast = Ofile;
        return 0;
}


//
// Handle items in processing list.
//
// After loading all objects, archives & include files, we now go and process
// each item on the processing list (plist). Once this is done, we go through
// any unresolved symbols left and see if they have shown up.
//
int ProcessLists(void)
{
        // Process object file list first (adds symbols from each unit & creates
        // the olist)
        while (plist != NULL)
        {
                if (DoItem(plist))
                        return 1;

                struct OFILE * ptemp = plist;
                plist = plist->o_next;
                free(ptemp);
        }

        struct HREC * uptr;

        // Process the unresolved symbols list. This may involve pulling in symbols
        // from any included .a units. Such units are lazy linked by default; we
        // generally don't want everything they provide, just what's referenced.
        for(uptr=unresolved; uptr!=NULL; )
        {
                if (vflag > 1)
                        printf("LookupHREC(%s) => ", uptr->h_sym);

                struct HREC * htemp = LookupHREC(uptr->h_sym);

                if (htemp != NULL)
                {
                        // Found it in the symbol table!
                        if (vflag > 1)
                                printf("%s in %s (=$%06X)\n", (isglobal(htemp->h_type) ? "global" : "common"), htemp->h_ofile->o_name, htemp->h_value);

                        // Mark the .o unit that the symbol is in as seen & remove from the
                        // unresolved list
                        htemp->h_ofile->o_flags |= O_USED;
                        uptr = RemoveUnresolvedSymbol(uptr);
                }
                else
                {
                        if (vflag > 1)
                                printf("NULL\n");

                        // Check to see if the unresolved symbol is on the AR symbol list.
                        htemp = LookupARHREC(uptr->h_sym);

                        // If the unresolved symbol is in a .o unit that is unused, we can
                        // drop it; same if the unresolved symbol is in the exported AR
                        // symbol list. Otherwise, go to the next unresolved symbol.
                        if (!(uptr->h_ofile->o_flags & O_USED) || (htemp != NULL))
                                uptr = RemoveUnresolvedSymbol(uptr);
                        else
                                uptr = uptr->h_next;

                        // Now that we've possibly deleted the symbol from unresolved list
                        // that was also in the AR list, we add the symbols from this .o
                        // unit to the symbol table, mark the .o unit as used, and restart
                        // scanning the unresolved list as there is a good possibility that
                        // the symbols in the unit we're adding has unresolved symbols as
                        // well.
                        if (htemp != NULL)
                        {
                                htemp->h_ofile->o_flags |= O_USED;
                                AddSymbols(htemp->h_ofile);
                                uptr = unresolved;
                        }
                }
        }

        // Show files used if the user requests it.
        if (vflag > 1)
        {
                printf("Files used:\n");
                struct OFILE * filePtr = olist;

                while (filePtr != NULL)
                {
                        if (filePtr->o_flags & O_USED)
                        {
                                printf("   %s%s%s\n", filePtr->o_name, (filePtr->isArchiveFile ? ":" : ""), (filePtr->isArchiveFile ? filePtr->o_arname : nullStr));
                        }

                        filePtr = filePtr->o_next;
                }
        }

        return 0;
}


//
// Extract filename from path
//
char * PathTail(char * name)
{
        // Find last occurance of PATH_DELIMETER
        char * temp = strrchr(name, PATH_DELIMITER);

        // Return what was passed in if path delimiter was not found
        if (temp == NULL)
                return name;

        return temp + 1;
}


//
// Add input file to processing list
//
int AddToProcessingList(char * ptr, char * fname, char * arname, uint8_t arFile, uint32_t tSize, uint32_t dSize, uint32_t bSize)
{
        if (plist == NULL)
        {
                // First time object record allocation
                plist = new_ofile();
                plast = plist;
        }
        else
        {
                // Next object record allocation
                plast->o_next = new_ofile();
                plast = plast->o_next;
        }

        if (plast == NULL)
        {
                printf("Out of memory.\n");             // Error if memory allocation fails
                return 1;
        }

        // Discard paths from filenames...
        fname = PathTail(fname);
        arname = PathTail(arname);

        // Check for filename length errors...
        if (strlen(fname) > (FNLEN - 1))
        {
                printf("File name too long: %s (sorry!)\n", fname);
                return 1;
        }

        if (strlen(arname) > (FNLEN - 1))
        {
                printf("AR file name too long: %s (sorry!)\n", arname);
                return 1;
        }

        strcpy(plast->o_name, fname);           // Store filename sans path
        strcpy(plast->o_arname, arname);        // Store archive name sans path
        plast->o_image = ptr;                           // Store data pointer
        plast->o_flags = (arFile ? 0 : O_USED); // File is used if NOT in archive
        plast->o_next = NULL;                           // Initialise next record pointer
        plast->isArchiveFile = arFile;          // Shamus: Temp until can sort it out
        plast->segSize[TEXT] = tSize;
        plast->segSize[DATA] = dSize;
        plast->segSize[BSS]  = bSize;

        return 0;                                                       // Return without errors
}


//
// Process in binary include files and add them to the processing list. This
// routine takes in the binary file and creates an 'object' file in memory.
// Sym1/Sym2 point to the start and end of data.
//
// Image size for include files is:
// Header ....... 32 bytes
// Data ......... dsize
// Sym fixups ... 2 * 12 bytes
// Symbol size .. 4 bytes (Value to include symbols and terminating null)
// Symbols ...... (strlen(sym1) + 1) + (strlen(sym2) + 1)
// Terminate .... 4 bytes (0x00000000)
//
int LoadInclude(char * fname, int handle, char * sym1, char * sym2, int segment)
{
        char * ptr, * sptr;
        int i;
        unsigned symtype = 0;
        uint32_t tSize = 0, dSize = 0, bSize = 0;

        long fsize = FileSize(handle);          // Get size of include file
        long dsize = (fsize + secalign) & ~secalign;    // Align size to boundary
        int sym1len = strlen(sym1) + 1;         // Get sym1 length + null termination
        int sym2len = strlen(sym2) + 1;         // Get sym2 length + null termination
        long size = 32 + dsize + 24 + 4 + sym1len + sym2len + 4;

        // Use calloc so the header & fixups initialize to zero
        // Allocate object image memory
        if ((ptr = calloc(size, 1)) == NULL)
        {
                printf("Out of memory while including %s\n", fname);
                close(handle);
                return 1;
        }

        // Read in binary data
        if (read(handle, ptr + 32, fsize) != fsize)
        {
                printf("File read error on %s\n", fname);
                close(handle);
                free(ptr);
                return 1;
        }

        close(handle);

        // Build this image's dummy header
        PutLong(ptr, 0x00000107);              // Magic number

        if (segment)
        {
                PutLong(ptr+4, dsize);             // Text size
                PutLong(ptr+8, 0L);                // Data size
                symtype = 0x05000000;
                tSize = dsize;
        }
        else
        {
                PutLong(ptr+4, 0L);                // Text size
                PutLong(ptr+8, dsize);             // Data size
                symtype = 0x07000000;
                dSize = dsize;
        }

        PutLong(ptr+12, 0L);                   // BSS size
        PutLong(ptr+16, 24);                   // Symbol table size
        PutLong(ptr+20, 0L);                   // Entry point
        PutLong(ptr+24, 0L);                   // TEXT relocation size
        PutLong(ptr+28, 0L);                   // DATA relocation size

        sptr = ptr + 32 + dsize;               // Set sptr to symbol table location

        PutLong(sptr,    4L);                  // String offset of symbol1
        PutLong(sptr+4,  symtype);             // Symbol type
        PutLong(sptr+8,  0x00000000);          // Symbol has no value (START)
        PutLong(sptr+12, 4L + (sym2len - 1));  // String offset of symbol2
        PutLong(sptr+16, symtype);             // Symbol type
        PutLong(sptr+20, dsize);               // Symbol is data size (END)

        sptr = ptr + 32 + dsize + 24;          // Set sptr to symbol table size loc

        PutLong(sptr, sym1len + 4L);           // Size of symbol table

        sptr = ptr + 32 + dsize + 24 + 4;      // Set sptr to symbol table location

        for(i=0; i<(sym1len-1); i++)           // Write symbol1 to string table
                sptr[i] = *sym1++;

        sptr += (sym1len - 1);                 // Step past symbol string
        *sptr = '\0';                          // Terminate symbol string
        sptr += 1;                             // Step past termination

        for(i=0; i<(sym2len-1); i++)           // Write symbol2 to string table
                sptr[i] = *sym2++;

        sptr += (sym2len - 1);                 // Step past symbol string
        *sptr = '\0';                          // Terminate symbol string
        sptr += 1;                             // Step past termination

        PutLong(sptr, 0L);                     // Terminating long for object file

        return AddToProcessingList(ptr, fname, nullStr, 0, tSize, dSize, bSize);
}


//
// Takes a file name, gets in its image, puts it on plist. The image may
// already be in memory: If so, the ptr arg is non-null.  If so, the file is
// already closed. Note that the file is already open (from DoFile()). RETURNS
// a pointer to the OFILE structure for this file, so you can diddle its flags
// (DoFile sets O_USED for files on the command line).
//
int LoadObject(char * fname, int fd, char * ptr)
{
        uint32_t tSize = 0, dSize = 0, bSize = 0;

        if (ptr == NULL)
        {
                long size = FileSize(fd);

                // Allocate memory for file data
                ptr = malloc(size);

                if (ptr == NULL)
                {
                        printf("Out of memory while processing %s\n", fname);
                        close(fd);
                        return 1;
                }

                // Read in file data
                if (read(fd, ptr, size) != size)
                {
                        printf("File read error on %s\n", fname);
                        close(fd);
                        free(ptr);
                        return 1;
                }

                tSize = (GetLong(ptr + 4)  + secalign) & ~secalign;
                dSize = (GetLong(ptr + 8)  + secalign) & ~secalign;
                bSize = (GetLong(ptr + 12) + secalign) & ~secalign;
                close(fd);
        }

        // Now add this image to the list of pending ofiles (plist)
        return AddToProcessingList(ptr, fname, nullStr, 0, tSize, dSize, bSize);
}

uint32_t SymTypeAlcToAout(uint32_t alcType)
{
        uint32_t type = T_UNDF;

        // Symbol type mappings here are derived from comparing Alcyon and BSD
        // object files generated by MADMAC using the "size" utility from jag_utils
        // (https://github.com/cubanismo/jag_utils) and the old PC/DOS Atari SDK.
        //
        // In BSD/a.out:
        //
        // 1)   text | global text == text relocatable symbol in this file
        // 2)   data | global data == data relocatable symbol in this file
        // 3)   BSS  | global BSS  == bss relocatable symbol in this file
        // 4)   ABS  | global ABS  == non-relocatable symbol in this file
        // 4) <none> | global <none> == undefined global symbol (extern)
        //
        // In DRI/Alcyon:
        //
        // 1) Everything seems to be marked defined.
        // 2) There is an explicit "external" bit. It appears to be mutually
        //    exclusive with the "global" bit, at least in MADMAC's output.
        // 3) There are separate "equated" and "equated reg" type bits that
        //    both represent ABS/non-relocatable values.
        if ((alcType & ALCSYM_EQUATED) ||
                (alcType & ALCSYM_EQUATED_REG))
                type |= T_ABS;
        else if (alcType & ALCSYM_TEXT)
                type |= T_TEXT;
        else if (alcType & ALCSYM_DATA)
                type |= T_DATA;
        else if (alcType & ALCSYM_BSS)
                type |= T_BSS;

        if ((alcType & ALCSYM_GLOBAL) ||
                (alcType & ALCSYM_EXTERN))
                type |= T_GLBL;

        return type;
}

int LoadAlcyon(char * fname, int fd)
{
        char *ptr, *sptr, *aout, *saout, *traout, *strPtr;
    char *trelptr, *drelptr, *relend;
        struct ALCHEADER hdr;
        struct ALCSYM *alcSyms;
        long size = FileSize(fd);
        size_t symStrLen;
        size_t strOff;
        uint32_t numSyms, numTRel, numDRel, i, j;

        // Validate the file is at least large enough to contain a valid header
        if (size < 0x1c)
        {
                printf("Alcyon object file %s too small to contain header\n", fname);
                return 1;
        }

        // Allocate memory for file data
        ptr = malloc(size);

        if (ptr == NULL)
        {
                printf("Out of memory while processing %s\n", fname);
                close(fd);
                return 1;
        }

        // Read in file data
        if (read(fd, ptr, size) != size)
        {
                printf("File read error on %s\n", fname);
                close(fd);
                free(ptr);
                return 1;
        }

        close(fd);

        hdr.magic = GetWord(ptr);
        hdr.tsize = GetLong(ptr + 2);
        hdr.dsize = GetLong(ptr + 6);
        hdr.bsize = GetLong(ptr + 10);
        hdr.ssize = GetLong(ptr + 14);

        // Construct a BSD-style/aout object file in memory from the Alcyon data
        numSyms = hdr.ssize / 14;

        alcSyms = calloc(numSyms, sizeof(*alcSyms));
        if (alcSyms == NULL)
        {
                printf("Out of memory while processing %s\n", fname);
                free(ptr);
                return 1;
        }

        sptr = ptr + 0x1c + hdr.tsize + hdr.dsize;
        trelptr = sptr + hdr.ssize;
        drelptr = trelptr + hdr.tsize;
        relend = drelptr + hdr.dsize;

        if (relend - ptr > size)
        {
                printf("Alcyon object file %s truncated: Header wants %ldB, file is %ldB\n",
                           fname, relend - ptr, size);
                return 1;
        }

        for (i = 0, symStrLen = 0; i < numSyms; i++)
        {
                memcpy(alcSyms[i].name, sptr, 8);
                alcSyms[i].type = GetWord(sptr + 8);
                alcSyms[i].value = GetLong(sptr + 10);
                symStrLen += strnlen((char *)alcSyms[i].name, 8) + 1;
                sptr += 14;
        }

        for (i = 0, numTRel = 0; trelptr + i < drelptr; i += 2)
        {
                uint16_t rel = GetWord(trelptr + i);
                if ((rel != ALCREL_ABS) &&
                        (rel != ALCREL_LONG))
                        numTRel++;
        }

        for (i = 0, numDRel = 0; drelptr + i < relend; i += 2)
        {
                uint16_t rel = GetWord(drelptr + i);
                if ((rel != ALCREL_ABS) &&
                        (rel != ALCREL_LONG))
                        numDRel++;
        }

        aout = malloc(32 + /* header */
                                  hdr.tsize +
                                  hdr.dsize +
                                  numTRel * 8 + /* Text section relocations */
                                  numDRel * 8 + /* Data section relocations */
                                  numSyms * 12 + /* symbol table */
                                  4 + symStrLen + /* string table size + strings */
                                  4 /* NULL-terminator for file */);
        if (aout == NULL)
        {
                printf("Out of memory while processing %s\n", fname);
                free(alcSyms);
                free(ptr);
                return 1;
        }

        // Construct the BSD/a.out header.
        PutLong(aout, 0x00000107);                              // Magic number

        PutLong(aout+4, hdr.tsize);                             // Text size
        PutLong(aout+8, hdr.dsize);                             // Data size
        PutLong(aout+12, hdr.bsize);                    // BSS size
        PutLong(aout+16, numSyms * 12);                 // Symbol table size
        PutLong(aout+20, 0L);                                   // Entry point

        PutLong(aout+24, numTRel * 8);                  // TEXT relocation size
        PutLong(aout+28, numDRel * 8);                  // DATA relocation size

        // Copy the raw text and data segments
        memcpy(aout + 32, ptr + 0x1c, hdr.tsize);
        memcpy(aout + 32 + hdr.tsize, ptr + 0x1c + hdr.tsize, hdr.dsize);

        // Set traout to the start of the relocation tables
        traout = aout + 32 + hdr.tsize + hdr.dsize;

        // Set saout to symbol table location
        saout = traout + numTRel * 8 + numDRel * 8 ;

        // Convert the text and data relocations to a.out format
        for (i = 0; trelptr + i < relend; i += 2)
        {
                uint16_t rel = GetWord(trelptr + i);
                uint16_t relFlags = rel & 7;
                uint32_t aoutflags = BSDREL_ABS;
                uint32_t valoffset = 0;
                char *const valaddr = aout + 32 + i;
                const uint32_t reladdr = (trelptr + i >= drelptr) ? i - hdr.tsize : i;

                if (relFlags == ALCREL_LONG)
                {
                        i += 2;
                        rel = GetWord(trelptr + i);
                        relFlags = rel & 7;
                }
                else
                {
                        aoutflags |= BSDREL_WORD;
                }

                if (relFlags == ALCREL_ABS)
                        continue;

                switch (relFlags) {
                case ALCREL_EXTPCREL:
            aoutflags &= ~BSDREL_ABS;
                        aoutflags |= BSDREL_PCREL;
            /* Fall through */
                case ALCREL_EXTABS:
                        aoutflags |= BSDREL_GLOBAL;
            aoutflags |= (ALCREL_SYMIDX(rel) << BSDREL_SYMIDX_SHIFT);
                        break;
                case ALCREL_TEXT:
                        aoutflags |= BSDREL_SEG_TEXT;
                        break;
                case ALCREL_DATA:
                        aoutflags |= BSDREL_SEG_DATA;
                        valoffset = hdr.tsize;
                        break;
                case ALCREL_BSS:
                        aoutflags |= BSDREL_SEG_BSS;
                        valoffset = hdr.tsize + hdr.dsize;
                        break;

                default:
                        printf("Invalid Alcyon relocation flags: 0x%02x\n", relFlags);
                        free(alcSyms);
                        free(ptr);
                        free(aout);
                        return 1;
                }

                if (valoffset != 0)
                {
                        if (aoutflags & BSDREL_WORD)
                        {
                                valoffset += GetWord(valaddr);
                                PutWord(valaddr, (uint16_t)valoffset);
                        }
                        else
                        {
                                valoffset += GetLong(valaddr);
                                PutLong(valaddr, valoffset);
                        }
                }

                PutLong(traout,         reladdr);
                PutLong(traout+4,       aoutflags);
                traout += 8;
        }

        // Done with the Alcyon data.
        free(ptr);
        ptr = NULL;
        sptr = NULL;

        // Set strPtr to string table location and write string table size
        strPtr = saout + numSyms * 12;
        PutLong(strPtr, 4 + symStrLen);

        for (i = 0, strOff = 4; i < numSyms; i++)
        {
                PutLong(saout,    strOff);           // String offset of symbol
                PutLong(saout+4,  SymTypeAlcToAout(alcSyms[i].type)); // Symbol type
                PutLong(saout+8,  alcSyms[i].value); // Symbol value
                saout += 12;

                for (j = 0; j < 8 && alcSyms[i].name[j] != '\0'; j++)
                        *(strPtr + strOff + j) = alcSyms[i].name[j];
                strOff += j;                         // Step past string
                *(strPtr + strOff) = '\0';           // Terminate symbol string
                strOff++;                            // Step past termination
        }

        PutLong(strPtr + strOff, 0L);          // Terminating long for object file

        // Done with the Alcyon symbol table.
        free(alcSyms);

        // Now add this image to the list of pending ofiles (plist)
        return AddToProcessingList(aout, fname, nullStr, 0, hdr.tsize, hdr.dsize, hdr.bsize);
}

//
// What it says on the tin: check for a .o suffix on the passed in string
//
uint8_t HasDotOSuffix(char * s)
{
        char * temp = strrchr(s, '.');

        if ((temp == NULL) || (strncmp(temp, ".o", 2) != 0))
                return 0;

        return 1;
}


//
// Process an ar archive file (*.a)
//
int LoadArchive(char * fname, int fd)
{
        // Read in the archive file to memory and process
        long size = FileSize(fd);
        char * ptr = malloc(size);
        char * endPtr = ptr + size;
        char * longFilenames = NULL;

        if (ptr == NULL)
        {
                printf("Out of memory while processing %s\n", fname);
                close(fd);
                return 1;
        }

        if (read(fd, ptr, size) != size)
        {
                printf("File read error on %s\n", fname);
                close(fd);
                free(ptr);
                return 1;
        }

        close(fd);

        // Save the pointer for later...
        arPtr[arIndex++] = ptr;
        char objName[FNLEN];
        char objSize[11];
        int i;
//printf("\nProcessing AR file \"%s\"...\n", fname);
        ptr += 8;

        // Loop through all objects in the archive and process them
        do
        {
                memset(objName, 0, 17);
                objSize[10] = 0;

                for(i=0; i<16; i++)
                {
//                      if ((ptr[i] == '/') || (ptr[i] == ' '))
                        if ((ptr[i] == ' ') && (i != 0))
                        {
                                objName[i] = 0;
                                break;
                        }

                        objName[i] = ptr[i];
                }

                for(i=0; i<10; i++)
                {
                        if (ptr[48 + i] == ' ')
                        {
                                objSize[i] = 0;
                                break;
                        }

                        objSize[i] = ptr[48 + i];
                }

                // Check to see if a long filename was requested
                // N.B.: " " is for GNU archives, and "/" is for BSD archives
                if ((objName[0] == 0x20) || (objName[0] == '/'))
                {
                        uint32_t fnSize = atoi(objName + 1);

                        if (longFilenames != NULL)
                        {
                                i = 0;
                                char * currentFilename = longFilenames + fnSize;

                                while (*currentFilename != 0x0A)
                                        objName[i++] = *currentFilename++;

                                objName[i] = 0;
                        }
                }

                if ((strncmp(objName, "ARFILENAMES/", 12) == 0) || (strncmp(objName, "//", 2) == 0))
                {
                        longFilenames = ptr + 60;
                }
                else if (HasDotOSuffix(objName))
                {

                        // Strip off any trailing forward slash at end of object name
                        int lastChar = strlen(objName) - 1;

                        if (objName[lastChar] == '/')
                                objName[lastChar] = 0;

//printf("Processing object \"%s\" (size == %i, obj_index == %i)...\n", objName, atoi(objSize), obj_index);
                        uint32_t tSize = (GetLong(ptr + 60 + 4)  + secalign) & ~secalign;
                        uint32_t dSize = (GetLong(ptr + 60 + 8)  + secalign) & ~secalign;
                        uint32_t bSize = (GetLong(ptr + 60 + 12) + secalign) & ~secalign;

                        if (AddToProcessingList(ptr + 60, objName, fname, 1, tSize, dSize, bSize))
                                return 1;
                }

                uint32_t size = atoi(objSize);
                size += (size & 0x01 ? 1 : 0);
                ptr += 60 + size;
        }
        while (ptr < endPtr);

        return 0;
}


//
// Process files (*.o, *.a) passed in on the command line
//
int ProcessFiles(void)
{
        int i;
        char magic[8];          // Magic header number (4 bytes for *.o, 8 for *.a)

        // Process all file handles
        for(i=0; i<(int)hd; i++)
        {
                // Verbose mode information
                if (vflag == 1)
                        printf("Read file %s%s\n", name[i], (hflag[i] ? " (include)" : ""));

                if (!hflag[i])
                {
                        // Attempt to read file magic number (OBJECT/ARCHIVE FILES)
                        if (read(handle[i], magic, 8) != 8)
                        {
                                printf("Error reading file %s\n", name[i]);
                                close(handle[i]);
                                return 1;
                        }

                        lseek(handle[i], 0L, 0);        // Reset to start of input file

                        // Look for RMAC/MAC/GCC (a.out) object files
                        if ((GetLong(magic) & 0xFFFF) == 0x0107)
                        {
                                // Process input object file
                                if (LoadObject(name[i], handle[i], 0L))
                                        return 1;
                        }
                        // Look for DRI Alcyon C (and old MAC) object files
                        else if (GetWord(magic) == 0x601A)
                        {
                                // Process Alcyon object file.
                                if (LoadAlcyon(name[i], handle[i]))
                                        return 1;
                        }
                        // Otherwise, look for an object archive file
                        else if (strncmp(magic, "!<arch>\x0A", 8) == 0)
                        {
                                if (LoadArchive(name[i], handle[i]))
                                        return 1;
                        }
                        else
                        {
                                // Close file and error
                                printf("%s is not a supported object or archive file\n", name[i]);
                                printf("Magic == [%02X][%02X][%02X][%02X]\n", magic[0], magic[1], magic[2], magic[3]);
                                close(handle[i]);
                                return 1;
                        }
                }
                else
                {
                        // INCLUDE FILES
                        // If hflag[i] is 1, include this in the data segment; if 2, put it
                        // in text segment
                        if (LoadInclude(name[i], handle[i], hsym1[i], hsym2[i], hflag[i] - 1))
                                return 1;
                }
        }

        // Free include, symbol & object handles
        for(i=0; i<(int)hd; i++)
        {
                free(name[i]);

                if (hflag[i])
                {
                        free(hsym1[i]);
                        free(hsym2[i]);
                }
        }

        // Reset next handle indicator
        hd = 0;
        return 0;
}


//
// Load newargv with pointers to arguments found in the buffer
//
int parse(char * buf, char * newargv[])
{
        int i = 1;

        if (vflag)
                printf("begin parsing\n");

        while (1)
        {
                while (*buf && strchr(",\t\n\r\14 ", *buf))
                        buf++;

                /* test for eof */
                if (*buf == '\0' || *buf == 26)
                {
                        if (i == 0)
                        {
                                printf("No commands in command file\n");
                                return -1;
                        }
                        else
                        {
                                return i;
                        }
                }

                /* test for comment */
                if (*buf == '#')
                {
                        /* found a comment; skip to next \n and start over */
                        while (*buf && *buf != '\n')
                                buf++;

                        continue;
                }

                if (i == MAXARGS)
                {
                        printf("Too many arguments in command file\n");
                        return -1;
                }

                newargv[i] = buf;

                while (!strchr(",\t\n\r\14 ", *buf))
                {
                        if (*buf == '\0' || *buf == 26)
                        {
                                printf("Finished parsing %d args\n", i);
                                return i;
                        }

                        buf++;
                }

                *buf++ = '\0';

                if (vflag)
                        printf("argv[%d] = \"%s\"\n", i, newargv[i]);

                i++;
        }
}


//
// Process in a link command file
//
int docmdfile(char * fname)
{
        int fd;                                     // File descriptor
        unsigned size;                              // Command file size
        char * ptr;                                 // Pointer
        int newargc;                                // New argument count
        char * (*newargv)[];                        // New argument value array

        // Verbose information
        if (vflag > 1)
                printf("docmdfile(%s)\n", fname);

        // Allocate memory for new argument values
        newargv = malloc((long)(sizeof(char *) * MAXARGS));

        if (!newargv)
        {
                printf("Out of memory.\n");
                return 1;
        }

        // Attempt to open and read in the command file
        if (fname)
        {
                if ((fd = open(fname, _OPEN_FLAGS)) < 0)
                {
                        printf("Cannot open command file %s.\n", fname);
                        return 1;
                }

                size = FileSize(fd);

                if ((ptr = malloc(size + 1)) == NULL)
                {
                        printf("Out of memory.\n");
                        close(fd);
                        return 1;
                }

                if (read(fd, ptr, size) != (int)size)
                {
                        printf("Read error on command file %s.\n", fname);
                        close(fd);
                        return 1;
                }

                *(ptr + size) = 0;                      // Null terminate the buffer
                close(fd);
        }
        else
        {
                printf("No command filename specified\n");
                return 1;
        }

        // Parse the command file
        if ((newargc = parse(ptr, *newargv)) == -1)
        {
                return 1;
        }

        // Process the inputted flags
        if (doargs(newargc, *newargv))
        {
                printf("docmdfile: doargs returns TRUE\n");
                return 1;
        }

        free(ptr);
        free(newargv);

        return 0;
}


//
// Take an argument list and parse the command line
//
int doargs(int argc, char * argv[])
{
        int i = 1;                                      // Iterator
        int c;                                          // Command line character
        char * ifile, * isym;           // File name and symbol name for -i

        // Parse through option switches & files
        while (i < argc)
        {
                // Process command line switches
                if (argv[i][0] == '-')
                {
                        if (!argv[i][1])
                        {
                                printf("Illegal option argument: %s\n\n", argv[i]);
                                ShowHelp();
                                return 1;
                        }

                        c = argv[i++][1];                       // Get next character in command line

                        // Process command line switch
                        switch (c)
                        {
                        case '?':                                       // Display usage information
                        case 'h':
                        case 'H':
                                ShowVersion();
                                ShowHelp();
                                return 1;
                        case 'a':
                        case 'A':                                       // Set absolute linking on
                                if (aflag)
                                        warn('a', 1);

                                if (i + 2 >= argc)
                                {
                                        printf("Not enough arguments to -a\n");
                                        return 1;
                                }

                                aflag = 1;                              // Set abs link flag

                                // Segment order is TEXT, DATA, BSS
                                // Text segment can be 'r' or a value
                                if ((*argv[i] == 'r' || *argv[i] == 'R') && !argv[i][1])
                                {
                                        ttype = -1;                     // TEXT segment is relocatable
                                }
                                else if ((*argv[i] == 'x' || *argv[i] == 'X'))
                                {
                                        printf("Error in text-segment address: cannot be contiguous\n");
                                        return 1;
                                }
                                else if (GetHexValue(argv[i], &tval))
                                {
                                        printf("Error in text-segment address: %s is not 'r' or an address.", argv[i]);
                                        return 1;
                                }

                                i++;

                                // Data segment can be 'r', 'x' or a value
                                if ((*argv[i] == 'r' || *argv[i] == 'R') && !argv[i][1])
                                {
                                        dtype = -1;                     // DATA segment is relocatable
                                }
                                else if ((*argv[i] == 'x' || *argv[i] == 'X'))
                                {
                                        dtype = -2;                     // DATA follows TEXT
                                }
                                else if (GetHexValue(argv[i], &dval))
                                {
                                        printf("Error in data-segment address: %s is not 'r', 'x' or an address.", argv[i]);
                                        return 1;
                                }

                                i++;

                                // BSS segment can be 'r', 'x' or a value
                                if ((*argv[i] == 'r' || *argv[i] == 'R') && !argv[i][1])
                                {
                                        btype = -1;                     // BSS segment is relocatable
                                }
                                else if ((*argv[i] == 'x' || *argv[i] == 'X'))
                                {
                                        switch (argv[i][1])
                                        {
                                                case 'd': case 'D': case '\0':
                                                        btype = -3;     // BSS follows DATA
                                                        break;

                                                case 't': case 'T':
                                                        btype = -2;     // BSS follows TEXT
                                                        if (btype == dtype)
                                                        {
                                                                printf("Error in bss-segment address: data-segment also follows text\n");
                                                                return 1;
                                                        }
                                                        break;

                                                default:
                                                        btype = -4;     // Error
                                                        break;
                                        }
                                }
                                else if (GetHexValue(argv[i], &bval))
                                {
                                        btype = -4;
                                        return 1;
                                }

                                if (btype == -4)
                                {
                                        printf("Error in bss-segment address: %s is not 'r', 'x[td]', or an address.", argv[i]);
                                        return 1;
                                }

                                i++;
                                break;
                        case 'b':
                        case 'B':                                       // Don't remove muliply defined locals
                                if (bflag)
                                        warn('b', 1);

                                bflag = 1;
                                break;
                        case 'c':
                        case 'C':                                       // Process a command file
                                if (i == argc)
                                {
                                        printf("Not enough arguments to -c\n");
                                        return 1;
                                }

                                if (docmdfile(argv[i++]))
                                {
                                        return 1;
                                }

                                break;
                        case 'd':
                        case 'D':                                       // Wait for "return" before exiting
                                if (dflag)
                                        warn('d', 0);

                                dflag = 1;
                                waitflag = 1;
                                break;
                        case 'e':
                        case 'E':                                       // Output COFF (absolute only)
                                cflag = 1;

                                if (noheaderflag)
                                        printf("Warning: -e overridden by -n, output will be headerless\n");

                                break;
                        case 'g':
                        case 'G':                                       // Output source level debugging
                                printf("\'g\' flag not currently implemented\n");
                                gflag = 0;
                                /*
                                if (gflag) warn('g', 1);
                                gflag = 1;
                                */
                                break;
                        case 'i':
                        case 'I':                                       // Include binary file
                                if (i + 2 > argc)
                                {
                                        printf("Not enough arguments to -i\n");
                                        return 1;
                                }

                                ifile = argv[i++];
                                isym = argv[i++];

                                // handle -ii (No truncation)
                                if ((argv[i-3][2] == 'i') || (argv[i-3][2] == 'I'))
                                {
                                        if (!cflag)
                                                printf("warning: (-ii) COFF format output not specified\n");
                                }
                                // handle -i (Truncation)
                                else
                                {
                                        if (strlen(isym) > 8)
                                                isym[8] = '\0';
                                }

                                // Place include files in the DATA segment only
                                if (DoFile(ifile, DSTSEG_D, isym))
                                        return 1;

                                break;
                        case 'l':
                        case 'L':                                       // Add local symbols
                                if (lflag)
                                        warn('l', 1);

                                lflag = 1;
                                break;
                        case 'm':
                        case 'M':                                       // Produce load symbol map
                                if (mflag)
                                        warn('m', 1);

                                mflag = 1;
                                break;
                        case 'n':
                        case 'N':                                       // Output no header to .abs file
                                if (noheaderflag)
                                        warn('n', 1);

                                if (cflag)
                                        printf("Warning: -e overridden by -n, output will be headerless\n");

                                noheaderflag = 1;
                                break;
                        case 'o':
                        case 'O':                                       // Specify an output file
                                if (oflag)
                                        warn('o', 1);

                                oflag = 1;

                                if (i >= argc)
                                {
                                        printf("No output filename following -o switch\n");
                                        return 1;
                                }

                                if (strlen(argv[i]) > FARGSIZE - 5)
                                {
                                        printf("Output file name too long (sorry!)\n");
                                        return 1;
                                }

                                strcpy(ofile, argv[i++]);
                                break;
                        case 'r':
                        case 'R':                                       // Section alignment size
                                if (rflag)
                                        warn('r', 1);

                                rflag = 1;

                                switch (argv[i-1][2])
                                {
                                        case 'w': case 'W': secalign = 1;  break; // Word alignment
                                        case 'l': case 'L': secalign = 3;  break; // Long alignment
                                        case 'p': case 'P': secalign = 7;  break; // Phrase alignment
                                        case 'd': case 'D': secalign = 15; break; // Double phrase alignment
                                        case 'q': case 'Q': secalign = 31; break; // Quad phrase alignment
                                        default:            secalign = 7;  break; // Default phrase alignment
                                }

                                break;
                        case 's':
                        case 'S':                                       // Output only global symbols
                                if (sflag)
                                        warn('s', 1);

                                sflag = 1;
                                break;
                        case 'u':
                        case 'U':                                       // Undefined symbols
                                uflag++;
                                break;
                        case 'v':
                        case 'V':                                       // Verbose information
                                if (!vflag && !versflag)
                                {
                                        ShowVersion();
                                }

                                vflag++;
                                break;
                        case 'w':
                        case 'W':                                       // Show warnings flag
                                if (wflag)
                                        warn('w', 1);

                                wflag = 1;
                                break;
                        case 'y':
                        case 'Y':
                                if (i >= argc)
                                {
                                        printf("No directory filename following -y switch\n");
                                        return 1;
                                }

                                if (strlen(argv[i]) > FARGSIZE * 3)
                                {
                                        printf("Directory file name too long (sorry!)\n");
                                        return 1;
                                }

                                strcpy(libdir, argv[i++]);
                                break;
                        case 'z':
                        case 'Z':                                       // Suppress banner flag
                                if (zflag)
                                        warn('z', 1);

                                zflag = 1;
                                break;
                        default:
                                printf("unknown option argument `%c'\n", c);
                                return 1;
                        }
                }
                else
                {
                        // Not a switch, then process as a file
                        if (DoFile(argv[i++], 0, NULL))
                                return 1;
                }
        }

        if (!oflag && vflag)
        {
                strcpy(ofile, "output");
                printf("Output file is %s[.ext]\n", ofile);
        }

        if (oflag && vflag)
                printf("Output file is %s\n", ofile);

        if (sflag)
                lflag = 0;

        // No problems encountered
        return 0;
}


//
// Display version information
//
void ShowVersion(void)
{
        if (displaybanner)// && vflag)
        {
                printf(
                "      _\n"
                " _ __| |_ ___\n"
                "| '__| | '_  \\\n"
                "| |  | | | | |\n"
                "|_|  |_|_| |_|\n"
                "\nRenamed Linker for Atari Jaguar\n"
                "Copyright (c) 199x Allan K. Pratt, 2014-2021 Reboot & Friends\n"
                "V%i.%i.%i %s (%s)\n\n", MAJOR, MINOR, PATCH, __DATE__, PLATFORM);
        }
}


//
// Display command line help
//
void ShowHelp(void)
{
        printf("Usage:\n");
        printf("    %s [-options] file(s)\n", cmdlnexec);
        printf("\n");
        printf("Options:\n");
        printf("   -? or -h                display usage information\n");
        printf("   -a <text> <data> <bss>  output absolute file (default: ABS)\n");
        printf("                           hex value: segment address\n");
        printf("                           r: relocatable segment\n");
        printf("                           x[dt]: contiguous segment\n");
        printf("                           for contiguous bss:\n");
        printf("                             d(default): follows data segment\n");
        printf("                             t:          follows text segment\n");
        printf("   -b                      don't remove multiply defined local labels\n");
        printf("   -c <fname>              add contents of <fname> to command line\n");
        printf("   -d                      wait for key after link\n");
        printf("   -e                      output COF absolute file\n");
        printf("   -g                      output source-level debugging\n");
        printf("   -i <fname> <label>      incbin <fname> and set <label> (trunc to 8 chars)\n");
        printf("   -ii <fname> <label>     incbin <fname> and set <label> (no truncation)\n");
        printf("   -l                      add local symbols\n");
        printf("   -m                      produce load symbols map\n");
        printf("   -n                      output no file header to absolute file (overrides -e)\n");
        printf("   -o <fname>              set output name\n");
        printf("   -r<size>                section alignment size\n");
        printf("                           w: word (2 bytes)\n");
        printf("                           l: long (4 bytes)\n");
        printf("                           p: phrase (8 bytes, default alignment)\n");
        printf("                           d: double phrase (16 bytes)\n");
        printf("                           q: quad phrase (32 bytes)\n");
        printf("   -s                      output only global symbols (supresses -l)\n");
        printf("   -u                      allow unresolved symbols (experimental)\n");
        printf("   -v                      set verbose mode\n");
        printf("   -w                      show linker warnings\n");
        printf("   -y <fname>              set include path (also set by RLNPATH)\n");
        printf("   -z                      suppress banner\n");
        printf("\n");
}


//
// Application exit
//
void ExitLinker(void)
{
        char tempbuf[128];

        // Display link status if verbose mode
        if (vflag)
                printf("Link %s.\n", errflag ? "aborted" : "complete");

        // Wait for return key if requested
        if (waitflag)
        {
                printf("\nPress the [RETURN] key to continue. ");
                char * c = fgets(tempbuf, 128, stdin);
        }

        exit(errflag);
}


int main(int argc, char * argv[])
{
        cmdlnexec = argv[0];                    // Obtain executable name
        char * s = getenv("RLNPATH");   // Attempt to obtain env variable

        if (s)
                strcpy(libdir, s);                      // Store it if found

        // Initialize some vars
        tval = dval = bval = 0;
        ttype = dtype = btype = 0;

        // Parse the command line
        if (doargs(argc, argv))
        {
                errflag = 1;
                ExitLinker();
        }

        // Check to see if include paths actually exist
        if (strlen(libdir) > 0)
        {
                DIR * test = opendir(libdir);

                if (test == NULL)
                {
                        printf("Invalid include path: %s\n", libdir);
                        errflag = 1;
                        ExitLinker();
                }

                closedir(test);
        }

        if (!zflag && !vflag)
        {
                ShowVersion();                          // Display version information
                versflag = 1;                           // We've dumped the version banner
        }

        // Load in specified files/objects and add to processing list
        if (ProcessFiles())
        {
                errflag = 1;
                ExitLinker();
        }

        // Work in items in processing list & deal with unresolved list
        if (ProcessLists())
        {
                errflag = 1;
                ExitLinker();
        }

        // Check that there is something to link
        if (olist == NULL)
        {
                ShowHelp();
                ExitLinker();
        }

        // Report unresolved externals
        if (unresolved != NULL)
        {
                printf("UNRESOLVED SYMBOLS\n");

                // Don't list them if two -u's or more
                if (uflag < 2)
                {
                        struct HREC * utemp = unresolved;

                        while (utemp != NULL)
                        {
                                printf("\t%s (", utemp->h_sym);
                                WriteARName(utemp->h_ofile);
                                printf(")\n");
                                utemp = utemp->h_next;
                        }
                }

                if (!uflag)
                {
                        errflag = 1;
                        ExitLinker();
                }
        }

        // Make one output object from input objects
        struct OHEADER * header = MakeOutputObject();

        if (header == NULL)
        {
                errflag = 1;
                ExitLinker();
        }

        // Partial linking
        if (pflag)
        {
                printf("TO DO: Partial linking\n");
                errflag = 1;
        }
        // Relocatable linking
        else if (!aflag)
        {
                printf("TO DO: Relocatable linking\n");
                errflag = 1;
        }
        // Absolute linking
        else
        {
                if (vflag)
                        printf("Absolute linking (%s)\n", (cflag ? "COF" : "ABS"));

                if (vflag > 1)
                        printf("Header magic is 0x%04X\n", (unsigned int)header->magic);

                if (WriteOutputFile(header))
                        errflag = 1;
        }

        // Display the loaded symbols map
        if (mflag)
                if (ShowSymbolLoadMap(header))
                        errflag = 1;

        // Display segment size summary
        if (vflag)
        {
                printf("\n");
                printf("+---------+----------+----------+----------+\n");
                printf("| Segment |     TEXT |     DATA |      BSS |\n");
                printf("| Sizes   |----------+----------+----------|\n");
                printf("| (Hex)   | %8X | %8X | %8X |\n", (unsigned int)header->tsize, (unsigned int)header->dsize, (unsigned int)header->bsize);
                printf("+---------+----------+----------+----------+\n\n");
        }

        free(header);
        ExitLinker();
}