Category : C Source Code
Archive   : SC88.ZIP
Filename : CC11.C

/*
** Small-C, 8088/8086 version -- modified by R. Grehan, BYTE Magazine
** execution begins here
*/
main(argc, argv) int argc, *argv; {
argcs=argc;
argvs=argv;
fputs("Small-C Compiler, ", stderr); fputs(VERSION, stderr);
fputs(CRIGHT1, stderr); fputs(CRIGHT2,stderr);
#ifdef DYNAMIC
swnext=calloc(SWTABSZ, 1);
swend=swnext+((SWTABSZ-SWSIZ)>>1);
stage=calloc(STAGESIZE, 1);
stagelast=stage+STAGELIMIT;
wq=calloc(WQTABSZ, BPW);
litq=calloc(LITABSZ, 1);
macn=calloc(MACNSIZE, 1);
macq=calloc(MACQSIZE, 1);
pline=calloc(LINESIZE, 1);
mline=calloc(LINESIZE, 1);
#else
swend=(swnext=swq)+SWTABSZ-SWSIZ;
stagelast=stage+STAGELIMIT;
#endif
swactive= /* not in switch */
stagenext= /* direct output mode */
iflevel= /* #if... nesting level = 0 */
skiplevel= /* #if... not encountered */
macptr= /* clear the macro pool */
csp= /* stack ptr (relative) */
errflag= /* not skipping errors till ";" */
eof= /* not eof yet */
ncmp= /* not in compound statement */
files=
filearg=
swused=
quote[1]=0;
func1= /* first function */
ccode=1; /* enable preprocessing */
wqptr=wq; /* clear while queue */
quote[0]='"'; /* fake a quote literal */
input=input2=EOF;
ask(); /* get user options */
openfile(); /* and initial input file */
preprocess(); /* fetch first line */
#ifdef DYNAMIC
symtab=calloc((NUMLOCS*SYMAVG + NUMGLBS*SYMMAX), 1);
#endif
locptr=STARTLOC;
glbptr=STARTGLB;
glbflag=1;
ctext=0;
header(); /* intro code */
setops(); /* set values in op arrays */
parse(); /* process ALL input */
outside(); /* verify outside any function */
trailer(); /* follow-up code */
fclose(output);
}

/*
** process all input text
**
** At this level, only static declarations,
** defines, includes and function
** definitions are legal...
*/
parse() {
while (eof==0) {
if(amatch("extern", 6)) dodeclare(EXTERNAL);
else if(dodeclare(STATIC));
else if(match("#asm")) doasm();
else if(match("#include"))doinclude();
else if(match("#define")) addmac();
else newfunc();
blanks(); /* force eof if pending */
}
}

/*
** dump the literal pool
*/
dumplits(size) int size; {
int j, k;
k=0;
while (k poll(1); /* allow program interruption */
defstorage(size);
j=10;
while(j--) {
outdec(getint(litq+k, size));
k=k+size;
if ((j==0)|(k>=litptr)) {nl(); break;}
outbyte(',');
}
}
}

/*
** dump zeroes for default initial values
*/
dumpzero(size, count) int size, count; {
int j;
while (count > 0) {
poll(1); /* allow program interruption */
defstorage(size);
j=30;
while(j--) {
outdec(0);
if ((--count <= 0)|(j==0)) {nl(); break;}
outbyte(',');
}
}
}

/*
** verify compile ends outside any function
*/
outside() {
if (ncmp) error("no closing bracket");
}

/*
** get run options
*/
ask() {
int i;
i=listfp=nxtlab=0;
output=stdout;
#ifdef OPTIMIZE
optimize=
#endif
alarm=monitor=pause=NO;
line=mline;
while(getarg(++i, line, LINESIZE, argcs, argvs)!=EOF) {
if(line[0]!='-') continue;
if((toupper(line[1])=='L')&(isdigit(line[2]))&(line[3]<=' ')) {
listfp=line[2]-'0';
continue;
}
if(line[2]<=' ') {
if(toupper(line[1])=='A') {
alarm=YES;
continue;
}
if(toupper(line[1])=='M') {
monitor=YES;
continue;
}
#ifdef OPTIMIZE
if(toupper(line[1])=='O') {
optimize=YES;
continue;
}
#endif
if(toupper(line[1])=='P') {
pause=YES;
continue;
}
}
#ifndef LINK
if(toupper(line[1])=='B') {
bump(0); bump(2);
if(number(&nxtlab)) continue;
}
#endif
sout("usage: cc [file]... [-m] [-a] [-p] [-l#]", stderr);
#ifdef OPTIMIZE
sout(" [-o]", stderr);
#endif
#ifndef LINK
sout(" [-b#]", stderr);
#endif
sout(NEWLINE, stderr);
abort(ERRCODE);
}
}

/*
** input and output file opens
*/
openfile() { /* entire function revised */
char outfn[15];
int i, j, ext;
input=EOF;
while(getarg(++filearg, pline, LINESIZE, argcs, argvs)!=EOF) {
if(pline[0]=='-') continue;
ext = NO;
i = -1;
j = 0;
while(pline[++i]) {
if(pline[i] == '.') {ext = YES; break;}
if(j < 10) outfn[j++] = pline[i];
}
if(!ext) {
strcpy(pline + i, ".C");
}
input = mustopen(pline, "r");
if(!files && isatty(stdout)) {
strcpy(outfn + j, ".MAC");
output = mustopen(outfn, "w");
}
files=YES;
kill();
return;
}
if(files++) eof=YES;
else input=stdin;
kill();
}

/*
** open a file with error checking
*/
mustopen(fn, mode) char *fn, *mode; {
int fd;
if(fd = fopen(fn, mode)) return fd;
sout("open error on ", stderr);
lout(fn, stderr);
abort(ERRCODE);
}

setops() {
op2[ 0]= op[ 0]= ffor; /* heir5 */
op2[ 1]= op[ 1]= ffxor; /* heir6 */
op2[ 2]= op[ 2]= ffand; /* heir7 */
op2[ 3]= op[ 3]= ffeq; /* heir8 */
op2[ 4]= op[ 4]= ffne;
op2[ 5]=ule; op[ 5]= ffle; /* heir9 */
op2[ 6]=uge; op[ 6]= ffge;
op2[ 7]=ult; op[ 7]= fflt;
op2[ 8]=ugt; op[ 8]= ffgt;
op2[ 9]= op[ 9]= ffasr; /* heir10 */
op2[10]= op[10]= ffasl;
op2[11]= op[11]= ffadd; /* heir11 */
op2[12]= op[12]= ffsub;
op2[13]= op[13]=ffmult; /* heir12 */
op2[14]= op[14]= ffdiv;
op2[15]= op[15]= ffmod;
}