Category : Assembly Language Source Code
Archive   : CUG292.ZIP
Filename : LKMAIN.C

 
Output of file : LKMAIN.C contained in archive : CUG292.ZIP
/* lkmain.c */

/*
* (C) Copyright 1989,1990
* All Rights Reserved
*
* Alan R. Baldwin
* 721 Berkeley St.
* Kent, Ohio 44240
*/

#include
#include
#include
#include "aslink.h"

VOID
main(argc, argv)
char *argv[];
{
register char *p;
register c, i;
FILE *afile();

fprintf(stdout, "\n");

pflag = 1;
startp = (struct lfile *) new (sizeof (struct lfile));

for (i=1; i p = argv[i];
if (*p == '-') {
while (ctype[c = *(++p)] & LETTER) {
switch(c) {

case 'c':
case 'C':
startp->f_type = F_STD;
break;

case 'f':
case 'F':
startp->f_type = F_LNK;
break;

case 'n':
case 'N':
pflag = 0;
break;

case 'p':
case 'P':
pflag = 1;
break;

default:
usage();
}
}
} else {
if (startp->f_type == F_LNK) {
startp->f_idp = p;
}
}
}
if (startp->f_type == NULL)
usage();
if (startp->f_type == F_LNK && startp->f_idp == NULL)
usage();

cfp = NULL;
sfp = NULL;
filep = startp;
while (1) {
ip = ib;
if (getline() == 0)
break;
if (pflag && sfp != stdin)
fprintf(stdout, "%s\n", ip);
if (*ip == NULL || parse())
break;
}
fclose(sfp);
if (linkp == NULL)
usage();

syminit();
for (pass=0; pass<2; ++pass) {
cfp = NULL;
sfp = NULL;
filep = linkp;
hp = NULL;
radix = 10;

while (getline()) {
ip = ib;
link();
}
if (pass == 0) {
/*
* Set area base addresses.
*/
setbas();
/*
* Link all area addresses.
*/
lnkarea();
/*
* Process global definitions.
*/
setgbl();
/*
* Check for undefined globals.
*/
symdef(stderr);
/*
* Output Link Map.
*/
if (mflag)
map();
/*
* Open output file
*/
if (oflag == 1)
ofp = afile(linkp->f_idp, "IHX", 1);
if (oflag == 2)
ofp = afile(linkp->f_idp, "S19", 1);
} else {
reloc('E');
}
}
}

VOID
link()
{
register c;

if ((c=endline()) == 0) { return; }
switch (c) {

case 'X':
radix = 16;
break;

case 'D':
radix = 10;
break;

case 'Q':
radix = 8;
break;

case 'H':
if (pass == 0) {
newhead();
} else {
if (hp == 0) {
hp = headp;
} else {
hp = hp->h_hp;
}
}
sdp.s_area = NULL;
sdp.s_areax = NULL;
sdp.s_addr = 0;
break;

case 'M':
if (pass == 0)
module();
break;

case 'A':
if (pass == 0)
newarea();
if (sdp.s_area == NULL) {
sdp.s_area = areap;
sdp.s_areax = areap->a_axp;
sdp.s_addr = 0;
}
break;

case 'S':
if (pass == 0)
newsym();
break;

case 'T':
case 'R':
case 'P':
if (pass == 0)
break;
reloc(c);
break;

default:
break;
}
if (c == 'X' || c == 'D' || c == 'Q') {
if ((c = get()) == 'H') {
hilo = 1;
} else
if (c == 'L') {
hilo = 0;
}
}
}

VOID
map()
{
register i;
register struct head *hdp;

/*
* Open Map File
*/
mfp = afile(linkp->f_idp, "MAP", 1);
/*
* Output Map Area Lists
*/
page = 0;
lop = NLPP;
slew(mfp);
ap = areap;
while (ap) {
lstarea(ap);
ap = ap->a_ap;
}
/*
* List Linked Files
*/
newpag(mfp);
fprintf(mfp, "\nFiles Linked [ module(s) ]\n\n");
hdp = headp;
filep = linkp;
while (filep) {
fprintf(mfp, "%-16s", filep->f_idp);
i = 0;
while (hdp->h_lfile == filep) {
if (i % 5) {
fprintf(mfp, ", %8.8s", hdp->m_id);
} else {
if (i) {
fprintf(mfp, ",\n%20s%8.8s", "", hdp->m_id);
} else {
fprintf(mfp, " [ %8.8s", hdp->m_id);
}
}
hdp = hdp->h_hp;
i++;
}
if (i)
fprintf(mfp, " ]");
fprintf(mfp, "\n");
filep = filep->f_flp;
}
/*
* List Base Address Definitions
*/
if (basep) {
newpag(mfp);
fprintf(mfp, "\nUser Base Address Definitions\n\n");
bsp = basep;
while (bsp) {
fprintf(mfp, "%s\n", bsp->b_strp);
bsp = bsp->b_base;
}
}
/*
* List Global Definitions
*/
if (globlp) {
newpag(mfp);
fprintf(mfp, "\nUser Global Definitions\n\n");
gsp = globlp;
while (gsp) {
fprintf(mfp, "%s\n", gsp->g_strp);
gsp = gsp->g_globl;
}
}
fprintf(mfp, "\n\f");
symdef(mfp);
}

int
parse()
{
register c;
char fid[NINPUT];

while ((c = getnb()) != 0) {
if ( c == '-') {
while (ctype[c=get()] & LETTER) {
switch(c) {

case 'i':
case 'I':
oflag = 1;
break;

case 's':
case 'S':
oflag = 2;
break;

case 'm':
case 'M':
++mflag;
break;

case 'x':
case 'X':
xflag = 0;
break;

case 'q':
case 'Q':
xflag = 1;
break;

case 'd':
case 'D':
xflag = 2;
break;

case 'e':
case 'E':
return(1);

case 'n':
case 'N':
pflag = 0;
break;

case 'p':
case 'P':
pflag = 1;
break;

case 'b':
case 'B':
bassav();
return(0);

case 'g':
case 'G':
gblsav();
return(0);

default:
fprintf(stderr, "Invalid option\n");
exit(1);
}
}
} else
if (ctype[c] & (LETTER|DIGIT)) {
if (linkp == NULL) {
linkp = (struct lfile *)
new (sizeof (struct lfile));
lfp = linkp;
} else {
lfp->f_flp = (struct lfile *)
new (sizeof (struct lfile));
lfp = lfp->f_flp;
}
getfid(fid, c);
lfp->f_idp = (char *) new (strlen(fid)+1);
strcpy(lfp->f_idp, fid);
lfp->f_type = F_REL;
} else
if (c == ';') {
return(0);
} else
if (c == ',') {
;
} else {
fprintf(stderr, "Invalid input");
exit(1);
}
}
return(0);
}

/*
* Base string save
*/
VOID
bassav()
{
if (basep == NULL) {
basep = (struct base *)
new (sizeof (struct base));
bsp = basep;
} else {
bsp->b_base = (struct base *)
new (sizeof (struct base));
bsp = bsp->b_base;
}
unget(getnb());
bsp->b_strp = (char *) new (strlen(ip)+1);
strcpy(bsp->b_strp, ip);
}

VOID
setbas()
{
register v;
char id[NCPS];

bsp = basep;
while (bsp) {
ip = bsp->b_strp;
getid(id, -1);
if (getnb() == '=') {
v = expr(0);
for (ap = areap; ap != NULL; ap = ap->a_ap) {
if (symeq(id, ap->a_id))
break;
}
if (ap == NULL) {
fprintf(stderr,
"No definition of area %s\n", id);
} else {
ap->a_addr = v;
}
} else {
fprintf(stderr, "No '=' in base expression");
}
bsp = bsp->b_base;
}
}

/*
* Global string save
*/
VOID
gblsav()
{
if (globlp == NULL) {
globlp = (struct globl *)
new (sizeof (struct globl));
gsp = globlp;
} else {
gsp->g_globl = (struct globl *)
new (sizeof (struct globl));
gsp = gsp->g_globl;
}
unget(getnb());
gsp->g_strp = (char *) new (strlen(ip)+1);
strcpy(gsp->g_strp, ip);
}

VOID
setgbl()
{
register v;
register struct sym *sp;
char id[NCPS];

gsp = globlp;
while (gsp) {
ip = gsp->g_strp;
getid(id, -1);
if (getnb() == '=') {
v = expr(0);
sp = lkpsym(id, 0);
if (sp == NULL) {
fprintf(stderr,
"No definition of symbol %s\n", id);
} else {
if (sp->s_flag & S_DEF) {
fprintf(stderr,
"Redefinition of symbol %s\n", id);
sp->s_axp = NULL;
}
sp->s_addr = v;
sp->s_type |= S_DEF;
}
} else {
fprintf(stderr, "No '=' in global expression");
}
gsp = gsp->g_globl;
}
}

FILE *
afile(fn, ft, wf)
char *fn;
char *ft;
{
register char *p1, *p2, *p3;
register c;
FILE *fp;
char fb[FILSPC];

p1 = fn;
p2 = fb;
p3 = ft;
while ((c = *p1++) != 0 && c != FSEPX) {
if (p2 < &fb[FILSPC-4])
*p2++ = c;
}
*p2++ = FSEPX;
if (*p3 == 0) {
if (c == FSEPX) {
p3 = p1;
} else {
p3 = "REL";
}
}
while ((c = *p3++) != 0) {
if (p2 < &fb[FILSPC-1])
*p2++ = c;
}
*p2++ = 0;
if ((fp = fopen(fb, wf?"w":"r")) == NULL) {
fprintf(stderr, "%s: cannot %s.\n", fb, wf?"create":"open");
exit(1);
}
return (fp);
}

char *usetxt[] = {
"Startup:",
" -c Command line input",
" -f file[LNK] File input",
"Usage: [-Options] file [file ...]",
" -p Prompt and echo of file[LNK] to stdout (default)",
" -n No echo of file[LNK] to stdout",
"Relocation:",
" -b area base address = expression",
" -g global symbol = expression",
"Map format:",
" -m Map output generated as file[MAP]",
" -x Hexidecimal (default)",
" -d Decimal",
" -q Octal",
"Output:",
" -i Intel Hex as file[IHX]",
" -s Motorola S19 as file[S19]",
"End:",
" -e or null line terminates input",
"",
0
};

VOID
usage()
{
register char **dp;

fprintf(stderr, "\nASxxxx Linker %s\n\n", VERSION);
for (dp = usetxt; *dp; dp++)
fprintf(stderr, "%s\n", *dp);
exit(1);
}


  3 Responses to “Category : Assembly Language Source Code
Archive   : CUG292.ZIP
Filename : LKMAIN.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/