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Power Programmierung
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Power-Programmierung CD 2 (Tewi)(1994).iso
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c
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compiler
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small_c
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byte_sc
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cc22.c
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1987-10-04
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8KB
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388 lines
/*
** Small C - 8088/8086 version - modified by R. Grehan, BYTE Magazine
*/
ifline() {
while(1) {
inline();
if(eof) return;
if(match("#ifdef")) {
++iflevel;
if(skiplevel) continue;
symname(msname, NO);
if(search(msname, macn, NAMESIZE+2, MACNEND, MACNBR, 0)==0)
skiplevel=iflevel;
continue;
}
if(match("#ifndef")) {
++iflevel;
if(skiplevel) continue;
symname(msname, NO);
if(search(msname, macn, NAMESIZE+2, MACNEND, MACNBR, 0))
skiplevel=iflevel;
continue;
}
if(match("#else")) {
if(iflevel) {
if(skiplevel==iflevel) skiplevel=0;
else if(skiplevel==0) skiplevel=iflevel;
}
else noiferr();
continue;
}
if(match("#endif")) {
if(iflevel) {
if(skiplevel==iflevel) skiplevel=0;
--iflevel;
}
else noiferr();
continue;
}
if(skiplevel) continue;
if(cch==0) continue;
break;
}
}
keepch(c) char c; {
if(pptr<LINEMAX) pline[++pptr]=c;
}
preprocess() {
int k;
char c;
if(ccode) {
line=mline;
ifline();
if(eof) return;
}
else {
line=pline;
inline();
return;
}
pptr = -1;
while(cch != NEWLINE && cch) {
if(white()) {
keepch(' ');
while(white()) gch();
}
else if(cch=='"') {
keepch(cch);
gch();
while((cch!='"')|((*(lptr-1)==92)&(*(lptr-2)!=92))) {
if(cch==0) {
error("no quote");
break;
}
keepch(gch());
}
gch();
keepch('"');
}
else if(cch==39) {
keepch(39);
gch();
while((cch!=39)|((*(lptr-1)==92)&(*(lptr-2)!=92))) {
if(cch==0) {
error("no apostrophe");
break;
}
keepch(gch());
}
gch();
keepch(39);
}
else if((cch=='/')&(nch=='*')) {
bump(2);
while(((cch=='*')&(nch=='/'))==0) {
if(cch) bump(1);
else {
ifline();
if(eof) break;
}
}
bump(2);
}
else if(an(cch)) {
k=0;
while((an(cch)) & (k<NAMEMAX)) {
msname[k++]=cch;
gch();
}
msname[k]=0;
if(search(msname, macn, NAMESIZE+2, MACNEND, MACNBR, 0)) {
k=getint(cptr+NAMESIZE, 2);
while(c=macq[k++]) keepch(c);
while(an(cch)) gch();
}
else {
k=0;
while(c=msname[k++]) keepch(c);
}
}
else keepch(gch());
}
if(pptr>=LINEMAX) error("line too long");
keepch(0);
line=pline;
bump(0);
}
noiferr() {
error("no matching #if...");
errflag=0;
}
addmac() {
int k;
if(symname(msname, NO)==0) {
illname();
kill();
return;
}
k=0;
if(search(msname, macn, NAMESIZE+2, MACNEND, MACNBR, 0)==0) {
if(cptr2=cptr) while(*cptr2++ = msname[k++]);
else {
error("macro name table full");
return;
}
}
putint(macptr, cptr+NAMESIZE, 2);
while(white()) gch();
while(putmac(gch()));
if(macptr>=MACMAX) {
error("macro string queue full"); abort(ERRCODE);
}
}
putmac(c) char c; {
macq[macptr]=c;
if(macptr<MACMAX) ++macptr;
return c;
}
/*
** search for symbol match
** on return cptr points to slot found or empty slot
*/
search(sname, buf, len, end, max, off)
char *sname, *buf, *end; int len, max, off; {
cptr=cptr2=buf+((hash(sname)%(max-1))*len);
while(*cptr != 0) {
if(astreq(sname, cptr+off, NAMEMAX)) return 1;
if((cptr=cptr+len) >= end) cptr=buf;
if(cptr == cptr2) return (cptr=0);
}
return 0;
}
hash(sname) char *sname; {
int i, c;
i=0;
while(c = *sname++) i=(i<<1)+c;
return i;
}
setstage(before, start) int *before, *start; {
if((*before=stagenext)==0) stagenext=stage;
*start=stagenext;
}
clearstage(before, start) char *before, *start; {
*stagenext=0;
if(stagenext=before) return;
if(start) {
#ifdef OPTIMIZE
peephole(start);
#else
sout(start, output);
#endif
}
}
outdec(number) int number; {
int k,zs;
char c, *q, *r;
zs = 0;
k=10000;
if (number<0) {
number=(-number);
outbyte('-');
}
while (k>=1) {
q=0; r=number;
while(r >= k) {++q; r -= k;}
c = q + '0';
if ((c!='0')|(k==1)|(zs)) {
zs=1;
outbyte(c);
}
number=r;
k=k/10;
}
}
ol(ptr) char ptr[]; {
ot(ptr);
nl();
}
ot(ptr) char ptr[]; {
outstr(ptr);
}
/* Act like a real C compiler...append all labels */
/* with underscores. */
outlab(ptr) char ptr[]; {
ot("_");
outstr(ptr);
}
outstr(ptr) char ptr[]; {
poll(1); /* allow program interruption */
/* must work with symbol table names terminated by length */
while(*ptr >= ' ') outbyte(*ptr++);
}
outbyte(c) char c; {
if(stagenext) {
if(stagenext==stagelast) {
error("staging buffer overflow");
return 0;
}
else *stagenext++ = c;
}
else cout(c,output);
return c;
}
cout(c, fd) char c; int fd; {
if(fputc(c,fd)==EOF) xout();
}
sout(string, fd) char *string; int fd; {
while(*string)
cout(*string++,fd);
}
lout(line, fd) char *line; int fd; {
sout(line, fd);
cout(NEWLINE, fd);
}
xout() {
fputs("output error", stderr);
abort(ERRCODE);
}
nl() {
outbyte(NEWLINE);
}
col() {
#ifdef COL
outbyte(':');
#endif
}
error(msg) char msg[]; {
if(errflag) return; else errflag=1;
lout(line, stderr);
errout(msg, stderr);
if(alarm) fputc(7, stderr);
if(pause) while(fgetc(stderr)!=NEWLINE);
if(listfp>0) errout(msg, listfp);
}
errout(msg, fp) char msg[]; int fp; {
int k; k=line+2;
while(k++ <= lptr) cout(' ', fp);
lout("/\\", fp);
sout("**** ", fp); lout(msg, fp);
}
streq(str1,str2) char str1[],str2[]; {
int k;
k=0;
while (str2[k]) {
if ((str1[k])!=(str2[k])) return 0;
++k;
}
return k;
}
astreq(str1,str2,len) char str1[],str2[];int len; {
int k;
k=0;
while (k<len) {
if ((str1[k])!=(str2[k]))break;
/*
** must detect end of symbol table names terminated by
** symbol length in binary
*/
if(str1[k] < ' ') break;
if(str2[k] < ' ') break;
++k;
}
if (an(str1[k]))return 0;
if (an(str2[k]))return 0;
return k;
}
match(lit) char *lit; {
int k;
blanks();
if (k=streq(lptr,lit)) {
bump(k);
return 1;
}
return 0;
}
amatch(lit,len) char *lit;int len; {
int k;
blanks();
if (k=astreq(lptr,lit,len)) {
bump(k);
while(an(cch)) inbyte();
return 1;
}
return 0;
}
nextop(list) char *list; {
char op[4];
opindex=0;
blanks();
while(1) {
opsize=0;
while(*list > ' ') op[opsize++] = *list++;
op[opsize]=0;
if(opsize=streq(lptr, op))
if((*(lptr+opsize) != '=')&
(*(lptr+opsize) != *(lptr+opsize-1)))
return 1;
if(*list) {
++list;
++opindex;
}
else return 0;
}
}
blanks() {
while(1) {
while(cch) {
if(white()) gch();
else return;
}
if(line==mline) return;
preprocess();
if(eof)break;
}
}