tinput.c - plan9port - [fork] Plan 9 from user space
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tinput.c (11631B)
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1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <ctype.h>
5 #include <errno.h>
6 #include "pic.h"
7 #include "y.tab.h"
8
9 Infile infile[10];
10 Infile *curfile = infile;
11
12 #define MAXSRC 50
13 Src src[MAXSRC]; /* input source stack */
14 Src *srcp = src;
15
16 void do_thru(void);
17 int nextchar(void);
18 int getarg(char *);
19 void freedef(char *);
20 int baldelim(int, char *);
21
22 void pushsrc(int type, char *ptr) /* new input source */
23 {
24 if (++srcp >= src + MAXSRC)
25 ERROR "inputs nested too deep" FATAL;
26 srcp->type = type;
27 srcp->sp = ptr;
28 if (dbg > 1) {
29 printf("\n%3d ", (int)(srcp - src));
30 switch (srcp->type) {
31 case File:
32 printf("push file %s\n", ((Infile *)ptr)->fname);
33 break;
34 case Macro:
35 printf("push macro <%s>\n", ptr);
36 break;
37 case Char:
38 printf("push char <%c>\n", *ptr);
39 break;
40 case Thru:
41 printf("push thru\n");
42 break;
43 case String:
44 printf("push string <%s>\n", ptr);
45 break;
46 case Free:
47 printf("push free <%s>\n", ptr);
48 break;
49 default:
50 ERROR "pushed bad type %d", srcp->type FATAL;
51 }
52 }
53 }
54
55 void popsrc(void) /* restore an old one */
56 {
57 if (srcp <= src)
58 ERROR "too many inputs popped" FATAL;
59 if (dbg > 1) {
60 printf("%3d ", (int) (srcp - src));
61 switch (srcp->type) {
62 case File:
63 printf("pop file\n");
64 break;
65 case Macro:
66 printf("pop macro\n");
67 break;
68 case Char:
69 printf("pop char <%c>\n", *srcp->sp);
70 break;
71 case Thru:
72 printf("pop thru\n");
73 break;
74 case String:
75 printf("pop string\n");
76 break;
77 case Free:
78 printf("pop free\n");
79 break;
80 default:
81 ERROR "pop weird input %d", srcp->type FATAL;
82 }
83 }
84 srcp--;
85 }
86
87 void definition(char *s) /* collect definition for s and install */
88 /* definitions picked up lexically */
89 {
90 char *p;
91 struct symtab *stp;
92
93 p = delimstr("definition");
94 stp = lookup(s);
95 if (stp != NULL) { /* it's there before */
96 if (stp->s_type != DEFNAME) {
97 ERROR "%s used as variable and definition", s WARNING;
98 return;
99 }
100 free(stp->s_val.p);
101 stp->s_val.p = p;
102 } else {
103 YYSTYPE u;
104 u.p = p;
105 makevar(tostring(s), DEFNAME, u);
106 }
107 dprintf("installing %s as `%s'\n", s, p);
108 }
109
110 char *delimstr(char *s) /* get body of X ... X */
111 /* message if too big */
112 {
113 int c, delim, rdelim, n, deep;
114 static char *buf = NULL;
115 static int nbuf = 0;
116 char *p;
117
118 if (buf == NULL)
119 buf = grow(buf, "buf", nbuf += 1000, sizeof(buf[0]));
120 while ((delim = input()) == ' ' || delim == '\t' || delim == '\n')
121 ;
122 rdelim = baldelim(delim, "{}"); /* could be "(){}[]`'" */
123 deep = 1;
124 for (p = buf; ; ) {
125 c = input();
126 if (c == rdelim)
127 if (--deep == 0)
128 break;
129 if (c == delim)
130 deep++;
131 if (p >= buf + nbuf) {
132 n = p - buf;
133 buf = grow(buf, "buf", nbuf += 1000, sizeof(buf[0]));
134 p = buf + n;
135 }
136 if (c == EOF)
137 ERROR "end of file in %s %c %.20s... %c", s, delim, buf, delim FATAL;
138 *p++ = c;
139 }
140 *p = '\0';
141 dprintf("delimstr %s %c <%s> %c\n", s, delim, buf, delim);
142 return tostring(buf);
143 }
144
145 int
146 baldelim(int c, char *s) /* replace c by balancing entry in s */
147 {
148 for ( ; *s; s += 2)
149 if (*s == c)
150 return s[1];
151 return c;
152 }
153
154 void undefine(char *s) /* undefine macro */
155 {
156 while (*s != ' ' && *s != '\t') /* skip "undef..." */
157 s++;
158 while (*s == ' ' || *s == '\t')
159 s++;
160 freedef(s);
161 }
162
163
164 Arg args[10]; /* argument frames */
165 Arg *argfp = args; /* frame pointer */
166 int argcnt; /* number of arguments seen so far */
167
168 void dodef(struct symtab *stp) /* collect args and switch input to defn */
169 {
170 int i, len;
171 char *p;
172 Arg *ap;
173
174 ap = argfp+1;
175 if (ap >= args+10)
176 ERROR "arguments too deep" FATAL;
177 argcnt = 0;
178 if (input() != '(')
179 ERROR "disaster in dodef" FATAL;
180 if (ap->argval == 0)
181 ap->argval = malloc(1000);
182 for (p = ap->argval; (len = getarg(p)) != -1; p += len) {
183 ap->argstk[argcnt++] = p;
184 if (input() == ')')
185 break;
186 }
187 for (i = argcnt; i < MAXARGS; i++)
188 ap->argstk[i] = "";
189 if (dbg)
190 for (i = 0; i < argcnt; i++)
191 printf("arg %d.%d = <%s>\n", (int) (ap-args), i+1, ap->argstk[i]);
192 argfp = ap;
193 pushsrc(Macro, stp->s_val.p);
194 }
195
196 int
197 getarg(char *p) /* pick up single argument, store in p, return length */
198 {
199 int n, c, npar;
200
201 n = npar = 0;
202 for ( ;; ) {
203 c = input();
204 if (c == EOF)
205 ERROR "end of file in getarg" FATAL;
206 if (npar == 0 && (c == ',' || c == ')'))
207 break;
208 if (c == '"') /* copy quoted stuff intact */
209 do {
210 *p++ = c;
211 n++;
212 } while ((c = input()) != '"' && c != EOF);
213 else if (c == '(')
214 npar++;
215 else if (c == ')')
216 npar--;
217 n++;
218 *p++ = c;
219 }
220 *p = 0;
221 unput(c);
222 return(n + 1);
223 }
224
225 #define PBSIZE 2000
226 char pbuf[PBSIZE]; /* pushback buffer */
227 char *pb = pbuf-1; /* next pushed back character */
228
229 char ebuf[200]; /* collect input here for error reporting */
230 char *ep = ebuf;
231
232 int begin = 0;
233 extern int thru;
234 extern struct symtab *thrudef;
235 extern char *untilstr;
236
237 int
238 input(void)
239 {
240 register int c;
241
242 if (thru && begin) {
243 do_thru();
244 begin = 0;
245 }
246 c = nextchar();
247 if (dbg > 1)
248 printf(" <%c>", c);
249 if (ep >= ebuf + sizeof ebuf)
250 ep = ebuf;
251 return *ep++ = c;
252 }
253
254 int
255 nextchar(void)
256 {
257 register int c;
258
259 c = 0; /* Botch: gcc */
260
261 loop:
262 switch (srcp->type) {
263 case Free: /* free string */
264 free(srcp->sp);
265 popsrc();
266 goto loop;
267 case Thru: /* end of pushed back line */
268 begin = 1;
269 popsrc();
270 c = '\n';
271 break;
272 case Char:
273 if (pb >= pbuf) {
274 c = *pb--;
275 popsrc();
276 break;
277 } else { /* can't happen? */
278 popsrc();
279 goto loop;
280 }
281 case String:
282 c = *srcp->sp++;
283 if (c == '\0') {
284 popsrc();
285 goto loop;
286 } else {
287 if (*srcp->sp == '\0') /* empty, so pop */
288 popsrc();
289 break;
290 }
291 case Macro:
292 c = *srcp->sp++;
293 if (c == '\0') {
294 if (--argfp < args)
295 ERROR "argfp underflow" FATAL;
296 popsrc();
297 goto loop;
298 } else if (c == '$' && isdigit((unsigned char) *srcp->sp)) {
299 int n = 0;
300 while (isdigit((unsigned char) *srcp->sp))
301 n = 10 * n + *srcp->sp++ - '0';
302 if (n > 0 && n <= MAXARGS)
303 pushsrc(String, argfp->argstk[n-1]);
304 goto loop;
305 }
306 break;
307 case File:
308 c = getc(curfile->fin);
309 if (c == EOF) {
310 if (curfile == infile)
311 ERROR "end of file inside .PS/.PE" FATAL;
312 if (curfile->fin != stdin) {
313 fclose(curfile->fin);
314 free(curfile->fname); /* assumes allocated */
315 }
316 curfile--;
317 printlf(curfile->lineno, curfile->fname);
318 popsrc();
319 thru = 0; /* chicken out */
320 thrudef = 0;
321 if (untilstr) {
322 free(untilstr);
323 untilstr = 0;
324 }
325 goto loop;
326 }
327 if (c == '\n')
328 curfile->lineno++;
329 break;
330 }
331 return c;
332 }
333
334 void do_thru(void) /* read one line, make into a macro expansion */
335 {
336 int c, i;
337 char *p;
338 Arg *ap;
339
340 ap = argfp+1;
341 if (ap >= args+10)
342 ERROR "arguments too deep" FATAL;
343 if (ap->argval == NULL)
344 ap->argval = malloc(1000);
345 p = ap->argval;
346 argcnt = 0;
347 c = nextchar();
348 if (thru == 0) { /* end of file was seen, so thru is done */
349 unput(c);
350 return;
351 }
352 for ( ; c != '\n' && c != EOF; ) {
353 if (c == ' ' || c == '\t') {
354 c = nextchar();
355 continue;
356 }
357 ap->argstk[argcnt++] = p;
358 if (c == '"') {
359 do {
360 *p++ = c;
361 if ((c = nextchar()) == '\\') {
362 *p++ = c;
363 *p++ = nextchar();
364 c = nextchar();
365 }
366 } while (c != '"' && c != '\n' && c != EOF);
367 *p++ = '"';
368 if (c == '"')
369 c = nextchar();
370 } else {
371 do {
372 *p++ = c;
373 } while ((c = nextchar())!=' ' && c!='\t' && c!='\n' && c!=',' && c!=EOF);
374 if (c == ',')
375 c = nextchar();
376 }
377 *p++ = '\0';
378 }
379 if (c == EOF)
380 ERROR "unexpected end of file in do_thru" FATAL;
381 if (argcnt == 0) { /* ignore blank line */
382 pushsrc(Thru, (char *) 0);
383 return;
384 }
385 for (i = argcnt; i < MAXARGS; i++)
386 ap->argstk[i] = "";
387 if (dbg)
388 for (i = 0; i < argcnt; i++)
389 printf("arg %d.%d = <%s>\n", (int) (ap-args), i+1, ap->argstk[i]);
390 if (strcmp(ap->argstk[0], ".PE") == 0) {
391 thru = 0;
392 thrudef = 0;
393 pushsrc(String, "\n.PE\n");
394 return;
395 }
396 if (untilstr && strcmp(ap->argstk[0], untilstr) == 0) {
397 thru = 0;
398 thrudef = 0;
399 free(untilstr);
400 untilstr = 0;
401 return;
402 }
403 pushsrc(Thru, (char *) 0);
404 dprintf("do_thru pushing back <%s>\n", thrudef->s_val.p);
405 argfp = ap;
406 pushsrc(Macro, thrudef->s_val.p);
407 }
408
409 int
410 unput(int c)
411 {
412 if (++pb >= pbuf + sizeof pbuf)
413 ERROR "pushback overflow" FATAL;
414 if (--ep < ebuf)
415 ep = ebuf + sizeof(ebuf) - 1;
416 *pb = c;
417 pushsrc(Char, pb);
418 return c;
419 }
420
421 void pbstr(char *s)
422 {
423 pushsrc(String, s);
424 }
425
426 double errcheck(double x, char *s)
427 {
428 if (errno == EDOM) {
429 errno = 0;
430 ERROR "%s argument out of domain", s WARNING;
431 } else if (errno == ERANGE) {
432 errno = 0;
433 ERROR "%s result out of range", s WARNING;
434 }
435 return x;
436 }
437
438 char errbuf[1000];
439
440 void eprint(void);
441
442 void yyerror(char *s)
443 {
444 extern char *cmdname;
445 int ern = errno; /* cause some libraries clobber it */
446
447 if (synerr)
448 return;
449 fflush(stdout);
450 fprintf(stderr, "%s: %s", cmdname, s);
451 if (ern > 0) {
452 errno = ern;
453 perror("???");
454 }
455 fprintf(stderr, " near %s:%d\n",
456 curfile->fname, curfile->lineno+1);
457 eprint();
458 synerr = 1;
459 errno = 0;
460 }
461
462 void eprint(void) /* try to print context around error */
463 {
464 char *p, *q;
465
466 p = ep - 1;
467 if (p > ebuf && *p == '\n')
468 p--;
469 for ( ; p >= ebuf && *p != '\n'; p--)
470 ;
471 while (*p == '\n')
472 p++;
473 fprintf(stderr, " context is\n\t");
474 for (q=ep-1; q>=p && *q!=' ' && *q!='\t' && *q!='\n'; q--)
475 ;
476 while (p < q)
477 putc(*p++, stderr);
478 fprintf(stderr, " >>> ");
479 while (p < ep)
480 putc(*p++, stderr);
481 fprintf(stderr, " <<< ");
482 while (pb >= pbuf)
483 putc(*pb--, stderr);
484 fgets(ebuf, sizeof ebuf, curfile->fin);
485 fprintf(stderr, "%s", ebuf);
486 pbstr("\n.PE\n"); /* safety first */
487 ep = ebuf;
488 }
489
490 void yywrap(void) {}
491
492 char *newfile = 0; /* filename for file copy */
493 char *untilstr = 0; /* string that terminates a thru */
494 int thru = 0; /* 1 if copying thru macro */
495 struct symtab *thrudef = 0; /* macro being used */
496
497 void copyfile(char *s) /* remember file to start reading from */
498 {
499 newfile = s;
500 }
501
502 void copydef(struct symtab *p) /* remember macro symtab ptr */
503 {
504 thrudef = p;
505 }
506
507 struct symtab *copythru(char *s) /* collect the macro name or body for thru */
508 {
509 struct symtab *p;
510 char *q, *addnewline(char *);
511
512 p = lookup(s);
513 if (p != NULL) {
514 if (p->s_type == DEFNAME) {
515 p->s_val.p = addnewline(p->s_val.p);
516 return p;
517 } else
518 ERROR "%s used as define and name", s FATAL;
519 }
520 /* have to collect the definition */
521 pbstr(s); /* first char is the delimiter */
522 q = delimstr("thru body");
523 s = "nameless";
524 p = lookup(s);
525 if (p != NULL) {
526 if (p->s_val.p)
527 free(p->s_val.p);
528 p->s_val.p = q;
529 } else {
530 YYSTYPE u;
531 u.p = q;
532 p = makevar(tostring(s), DEFNAME, u);
533 }
534 p->s_val.p = addnewline(p->s_val.p);
535 dprintf("installing %s as `%s'\n", s, p->s_val.p);
536 return p;
537 }
538
539 char *addnewline(char *p) /* add newline to end of p */
540 {
541 int n;
542
543 n = strlen(p);
544 if (p[n-1] != '\n') {
545 p = realloc(p, n+2);
546 p[n] = '\n';
547 p[n+1] = '\0';
548 }
549 return p;
550 }
551
552 void copyuntil(char *s) /* string that terminates a thru */
553 {
554 untilstr = s;
555 }
556
557 void copy(void) /* begin input from file, etc. */
558 {
559 FILE *fin;
560
561 if (newfile) {
562 if ((fin = fopen(newfile, "r")) == NULL)
563 ERROR "can't open file %s", newfile FATAL;
564 curfile++;
565 curfile->fin = fin;
566 curfile->fname = newfile;
567 curfile->lineno = 0;
568 printlf(1, curfile->fname);
569 pushsrc(File, curfile->fname);
570 newfile = 0;
571 }
572 if (thrudef) {
573 thru = 1;
574 begin = 1; /* wrong place */
575 }
576 }
577
578 char shellbuf[1000], *shellp;
579
580 void shell_init(void) /* set up to interpret a shell command */
581 {
582 sprintf(shellbuf, "rc -c '");
583 shellp = shellbuf + strlen(shellbuf);
584 }
585
586 void shell_text(char *s) /* add string to command being collected */
587 {
588 while ((*shellp++ = *s++))
589 ;
590 shellp--;
591 }
592
593 void shell_exec(void) /* do it */
594 {
595 *shellp++ = '\'';
596 *shellp = '\0';
597 system(shellbuf);
598 }