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- #include "e.h"
- #include "y.tab.h"
- #include <ctype.h>
- #include <errno.h>
- Infile infile[10];
- Infile *curfile = infile;
- #define MAXSRC 50
- Src src[MAXSRC]; /* input source stack */
- Src *srcp = src;
- extern int getarg(char *);
- extern void eprint(void);
- void pushsrc(int type, char *ptr) /* new input source */
- {
- if (++srcp >= src + MAXSRC)
- ERROR "inputs nested too deep" FATAL;
- srcp->type = type;
- srcp->sp = ptr;
- if (dbg > 1) {
- printf("\n%3d ", srcp - src);
- switch (srcp->type) {
- case File:
- printf("push file %s\n", ((Infile *)ptr)->fname);
- break;
- case Macro:
- printf("push macro <%s>\n", ptr);
- break;
- case Char:
- printf("push char <%c>\n", *ptr);
- break;
- case String:
- printf("push string <%s>\n", ptr);
- break;
- case Free:
- printf("push free <%s>\n", ptr);
- break;
- default:
- ERROR "pushed bad type %d\n", srcp->type FATAL;
- }
- }
- }
- void popsrc(void) /* restore an old one */
- {
- if (srcp <= src)
- ERROR "too many inputs popped" FATAL;
- if (dbg > 1) {
- printf("%3d ", srcp - src);
- switch (srcp->type) {
- case File:
- printf("pop file\n");
- break;
- case Macro:
- printf("pop macro\n");
- break;
- case Char:
- printf("pop char <%c>\n", *srcp->sp);
- break;
- case String:
- printf("pop string\n");
- break;
- case Free:
- printf("pop free\n");
- break;
- default:
- ERROR "pop weird input %d\n", srcp->type FATAL;
- }
- }
- srcp--;
- }
- Arg args[10]; /* argument frames */
- Arg *argfp = args; /* frame pointer */
- int argcnt; /* number of arguments seen so far */
- void dodef(tbl *stp) /* collect args and switch input to defn */
- {
- int i, len;
- char *p;
- Arg *ap;
- ap = argfp+1;
- if (ap >= args+10)
- ERROR "more than arguments\n" FATAL;
- argcnt = 0;
- if (input() != '(')
- ERROR "disaster in dodef\n"FATAL;
- if (ap->argval == 0)
- ap->argval = malloc(1000);
- for (p = ap->argval; (len = getarg(p)) != -1; p += len) {
- ap->argstk[argcnt++] = p;
- if (input() == ')')
- break;
- }
- for (i = argcnt; i < MAXARGS; i++)
- ap->argstk[i] = "";
- if (dbg)
- for (i = 0; i < argcnt; i++)
- printf("arg %d.%d = <%s>\n", ap-args, i+1, ap->argstk[i]);
- argfp = ap;
- pushsrc(Macro, stp->cval);
- }
- getarg(char *p) /* pick up single argument, store in p, return length */
- {
- int n, c, npar;
- n = npar = 0;
- for ( ;; ) {
- c = input();
- if (c == EOF)
- ERROR "end of file in getarg!\n" FATAL;
- if (npar == 0 && (c == ',' || c == ')'))
- break;
- if (c == '"') /* copy quoted stuff intact */
- do {
- *p++ = c;
- n++;
- } while ((c = input()) != '"' && c != EOF);
- else if (c == '(')
- npar++;
- else if (c == ')')
- npar--;
- n++;
- *p++ = c;
- }
- *p = 0;
- unput(c);
- return(n + 1);
- }
- #define PBSIZE 2000
- char pbuf[PBSIZE]; /* pushback buffer */
- char *pb = pbuf-1; /* next pushed back character */
- char ebuf[200]; /* collect input here for error reporting */
- char *ep = ebuf;
- input(void)
- {
- register int c = 0;
- loop:
- switch (srcp->type) {
- case File:
- c = getc(curfile->fin);
- if (c == EOF) {
- if (curfile == infile)
- break;
- if (curfile->fin != stdin) {
- fclose(curfile->fin);
- free(curfile->fname); /* assumes allocated */
- }
- curfile--;
- printf(".lf %d %s\n", curfile->lineno, curfile->fname);
- popsrc();
- goto loop;
- }
- if (c == '\n')
- curfile->lineno++;
- break;
- case Char:
- if (pb >= pbuf) {
- c = *pb--;
- popsrc();
- break;
- } else { /* can't happen? */
- popsrc();
- goto loop;
- }
- case String:
- c = *srcp->sp++;
- if (c == '\0') {
- popsrc();
- goto loop;
- } else {
- if (*srcp->sp == '\0') /* empty, so pop */
- popsrc();
- break;
- }
- case Macro:
- c = *srcp->sp++;
- if (c == '\0') {
- if (--argfp < args)
- ERROR "argfp underflow" FATAL;
- popsrc();
- goto loop;
- } else if (c == '$' && isdigit(*srcp->sp)) {
- int n = 0;
- while (isdigit(*srcp->sp))
- n = 10 * n + *srcp->sp++ - '0';
- if (n > 0 && n <= MAXARGS)
- pushsrc(String, argfp->argstk[n-1]);
- goto loop;
- }
- break;
- case Free: /* free string */
- free(srcp->sp);
- popsrc();
- goto loop;
- }
- if (ep >= ebuf + sizeof ebuf)
- ep = ebuf;
- *ep++ = c;
- return c;
- }
- unput(int c)
- {
- if (++pb >= pbuf + sizeof pbuf)
- ERROR "pushback overflow\n"FATAL;
- if (--ep < ebuf)
- ep = ebuf + sizeof(ebuf) - 1;
- *pb = c;
- pushsrc(Char, pb);
- return c;
- }
- void pbstr(char *s)
- {
- pushsrc(String, s);
- }
- void error(int die, char *s)
- {
- extern char *cmdname;
- if (synerr)
- return;
- fprintf(stderr, "%s: ", cmdname);
- fprintf(stderr, s);
- if (errno > 0)
- perror("???");
- if (curfile->fin)
- fprintf(stderr, " near %s:%d",
- curfile->fname, curfile->lineno+1);
- fprintf(stderr, "\n");
- eprint();
- synerr = 1;
- errno = 0;
- if (die) {
- if (dbg)
- abort();
- else
- exit(1);
- }
- }
- void yyerror(char *s)
- {
- error(0, s); /* temporary */
- }
- char errbuf[200];
- void eprint(void) /* try to print context around error */
- {
- char *p, *q;
- if (ep == ebuf)
- return; /* no context */
- p = ep - 1;
- if (p > ebuf && *p == '\n')
- p--;
- for ( ; p >= ebuf && *p != '\n'; p--)
- ;
- while (*p == '\n')
- p++;
- fprintf(stderr, " context is\n\t");
- for (q=ep-1; q>=p && *q!=' ' && *q!='\t' && *q!='\n'; q--)
- ;
- while (p < q)
- putc(*p++, stderr);
- fprintf(stderr, " >>> ");
- while (p < ep)
- putc(*p++, stderr);
- fprintf(stderr, " <<< ");
- while (pb >= pbuf)
- putc(*pb--, stderr);
- if (curfile->fin)
- fgets(ebuf, sizeof ebuf, curfile->fin);
- fprintf(stderr, "%s", ebuf);
- pbstr("\n.EN\n"); /* safety first */
- ep = ebuf;
- }
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