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-rw-r--r--src/tools/lcc/cpp/cpp.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/src/tools/lcc/cpp/cpp.c b/src/tools/lcc/cpp/cpp.c
new file mode 100644
index 0000000..6739e4d
--- /dev/null
+++ b/src/tools/lcc/cpp/cpp.c
@@ -0,0 +1,322 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <stdarg.h>
+#include "cpp.h"
+
+char rcsid[] = "cpp.c - faked rcsid";
+
+#define OUTS 16384
+char outbuf[OUTS];
+char *outp = outbuf;
+Source *cursource;
+int nerrs;
+struct token nltoken = { NL, 0, 0, 0, 1, (uchar*)"\n" };
+char *curtime;
+int incdepth;
+int ifdepth;
+int ifsatisfied[NIF];
+int skipping;
+
+
+int
+main(int argc, char **argv)
+{
+ Tokenrow tr;
+ time_t t;
+ char ebuf[BUFSIZ];
+
+ setbuf(stderr, ebuf);
+ t = time(NULL);
+ curtime = ctime(&t);
+ maketokenrow(3, &tr);
+ expandlex();
+ setup(argc, argv);
+ fixlex();
+ iniths();
+ genline();
+ process(&tr);
+ flushout();
+ fflush(stderr);
+ exit(nerrs > 0);
+ return 0;
+}
+
+void
+process(Tokenrow *trp)
+{
+ int anymacros = 0;
+
+ for (;;) {
+ if (trp->tp >= trp->lp) {
+ trp->tp = trp->lp = trp->bp;
+ outp = outbuf;
+ anymacros |= gettokens(trp, 1);
+ trp->tp = trp->bp;
+ }
+ if (trp->tp->type == END) {
+ if (--incdepth>=0) {
+ if (cursource->ifdepth)
+ error(ERROR,
+ "Unterminated conditional in #include");
+ unsetsource();
+ cursource->line += cursource->lineinc;
+ trp->tp = trp->lp;
+ genline();
+ continue;
+ }
+ if (ifdepth)
+ error(ERROR, "Unterminated #if/#ifdef/#ifndef");
+ break;
+ }
+ if (trp->tp->type==SHARP) {
+ trp->tp += 1;
+ control(trp);
+ } else if (!skipping && anymacros)
+ expandrow(trp, NULL);
+ if (skipping)
+ setempty(trp);
+ puttokens(trp);
+ anymacros = 0;
+ cursource->line += cursource->lineinc;
+ if (cursource->lineinc>1) {
+ genline();
+ }
+ }
+}
+
+void
+control(Tokenrow *trp)
+{
+ Nlist *np;
+ Token *tp;
+
+ tp = trp->tp;
+ if (tp->type!=NAME) {
+ if (tp->type==NUMBER)
+ goto kline;
+ if (tp->type != NL)
+ error(ERROR, "Unidentifiable control line");
+ return; /* else empty line */
+ }
+ if ((np = lookup(tp, 0))==NULL || ((np->flag&ISKW)==0 && !skipping)) {
+ error(WARNING, "Unknown preprocessor control %t", tp);
+ return;
+ }
+ if (skipping) {
+ switch (np->val) {
+ case KENDIF:
+ if (--ifdepth<skipping)
+ skipping = 0;
+ --cursource->ifdepth;
+ setempty(trp);
+ return;
+
+ case KIFDEF:
+ case KIFNDEF:
+ case KIF:
+ if (++ifdepth >= NIF)
+ error(FATAL, "#if too deeply nested");
+ ++cursource->ifdepth;
+ return;
+
+ case KELIF:
+ case KELSE:
+ if (ifdepth<=skipping)
+ break;
+ return;
+
+ default:
+ return;
+ }
+ }
+ switch (np->val) {
+ case KDEFINE:
+ dodefine(trp);
+ break;
+
+ case KUNDEF:
+ tp += 1;
+ if (tp->type!=NAME || trp->lp - trp->bp != 4) {
+ error(ERROR, "Syntax error in #undef");
+ break;
+ }
+ if ((np = lookup(tp, 0)) != NULL)
+ np->flag &= ~ISDEFINED;
+ break;
+
+ case KPRAGMA:
+ return;
+
+ case KIFDEF:
+ case KIFNDEF:
+ case KIF:
+ if (++ifdepth >= NIF)
+ error(FATAL, "#if too deeply nested");
+ ++cursource->ifdepth;
+ ifsatisfied[ifdepth] = 0;
+ if (eval(trp, np->val))
+ ifsatisfied[ifdepth] = 1;
+ else
+ skipping = ifdepth;
+ break;
+
+ case KELIF:
+ if (ifdepth==0) {
+ error(ERROR, "#elif with no #if");
+ return;
+ }
+ if (ifsatisfied[ifdepth]==2)
+ error(ERROR, "#elif after #else");
+ if (eval(trp, np->val)) {
+ if (ifsatisfied[ifdepth])
+ skipping = ifdepth;
+ else {
+ skipping = 0;
+ ifsatisfied[ifdepth] = 1;
+ }
+ } else
+ skipping = ifdepth;
+ break;
+
+ case KELSE:
+ if (ifdepth==0 || cursource->ifdepth==0) {
+ error(ERROR, "#else with no #if");
+ return;
+ }
+ if (ifsatisfied[ifdepth]==2)
+ error(ERROR, "#else after #else");
+ if (trp->lp - trp->bp != 3)
+ error(ERROR, "Syntax error in #else");
+ skipping = ifsatisfied[ifdepth]? ifdepth: 0;
+ ifsatisfied[ifdepth] = 2;
+ break;
+
+ case KENDIF:
+ if (ifdepth==0 || cursource->ifdepth==0) {
+ error(ERROR, "#endif with no #if");
+ return;
+ }
+ --ifdepth;
+ --cursource->ifdepth;
+ if (trp->lp - trp->bp != 3)
+ error(WARNING, "Syntax error in #endif");
+ break;
+
+ case KERROR:
+ trp->tp = tp+1;
+ error(WARNING, "#error directive: %r", trp);
+ break;
+
+ case KLINE:
+ trp->tp = tp+1;
+ expandrow(trp, "<line>");
+ tp = trp->bp+2;
+ kline:
+ if (tp+1>=trp->lp || tp->type!=NUMBER || tp+3<trp->lp
+ || ((tp+3==trp->lp && ((tp+1)->type!=STRING))||*(tp+1)->t=='L')){
+ error(ERROR, "Syntax error in #line");
+ return;
+ }
+ cursource->line = atol((char*)tp->t)-1;
+ if (cursource->line<0 || cursource->line>=32768)
+ error(WARNING, "#line specifies number out of range");
+ tp = tp+1;
+ if (tp+1<trp->lp)
+ cursource->filename=(char*)newstring(tp->t+1,tp->len-2,0);
+ return;
+
+ case KDEFINED:
+ error(ERROR, "Bad syntax for control line");
+ break;
+
+ case KINCLUDE:
+ doinclude(trp);
+ trp->lp = trp->bp;
+ return;
+
+ case KEVAL:
+ eval(trp, np->val);
+ break;
+
+ default:
+ error(ERROR, "Preprocessor control `%t' not yet implemented", tp);
+ break;
+ }
+ setempty(trp);
+ return;
+}
+
+void *
+domalloc(int size)
+{
+ void *p = malloc(size);
+
+ if (p==NULL)
+ error(FATAL, "Out of memory from malloc");
+ return p;
+}
+
+void
+dofree(void *p)
+{
+ free(p);
+}
+
+void
+error(enum errtype type, char *string, ...)
+{
+ va_list ap;
+ char *cp, *ep;
+ Token *tp;
+ Tokenrow *trp;
+ Source *s;
+ int i;
+
+ fprintf(stderr, "cpp: ");
+ for (s=cursource; s; s=s->next)
+ if (*s->filename)
+ fprintf(stderr, "%s:%d ", s->filename, s->line);
+ va_start(ap, string);
+ for (ep=string; *ep; ep++) {
+ if (*ep=='%') {
+ switch (*++ep) {
+
+ case 's':
+ cp = va_arg(ap, char *);
+ fprintf(stderr, "%s", cp);
+ break;
+ case 'd':
+ i = va_arg(ap, int);
+ fprintf(stderr, "%d", i);
+ break;
+ case 't':
+ tp = va_arg(ap, Token *);
+ fprintf(stderr, "%.*s", tp->len, tp->t);
+ break;
+
+ case 'r':
+ trp = va_arg(ap, Tokenrow *);
+ for (tp=trp->tp; tp<trp->lp&&tp->type!=NL; tp++) {
+ if (tp>trp->tp && tp->wslen)
+ fputc(' ', stderr);
+ fprintf(stderr, "%.*s", tp->len, tp->t);
+ }
+ break;
+
+ default:
+ fputc(*ep, stderr);
+ break;
+ }
+ } else
+ fputc(*ep, stderr);
+ }
+ va_end(ap);
+ fputc('\n', stderr);
+ if (type==FATAL)
+ exit(1);
+ if (type!=WARNING)
+ nerrs = 1;
+ fflush(stderr);
+}
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