1 /* $OpenBSD: misc.c,v 1.47 2017/06/15 13:48:42 bcallah Exp $ */
2 /* $NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $ */
3
4 /*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 1989, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Ozan Yigit at York University.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #include <sys/types.h>
39 #include <errno.h>
40 #include <unistd.h>
41 #include <stdarg.h>
42 #include <stdio.h>
43 #include <stdint.h>
44 #include <stdlib.h>
45 #include <stddef.h>
46 #include <string.h>
47 #include <err.h>
48 #include "mdef.h"
49 #include "stdd.h"
50 #include "extern.h"
51 #include "pathnames.h"
52
53
54 char *ep; /* first free char in strspace */
55 static char *strspace; /* string space for evaluation */
56 char *endest; /* end of string space */
57 static size_t strsize = STRSPMAX;
58 static size_t bufsize = BUFSIZE;
59
60 unsigned char *buf; /* push-back buffer */
61 unsigned char *bufbase; /* the base for current ilevel */
62 unsigned char *bbase[MAXINP]; /* the base for each ilevel */
63 unsigned char *bp; /* first available character */
64 unsigned char *endpbb; /* end of push-back buffer */
65
66
67 /*
68 * find the index of second str in the first str.
69 */
70 ptrdiff_t
indx(const char * s1,const char * s2)71 indx(const char *s1, const char *s2)
72 {
73 char *t;
74
75 t = strstr(s1, s2);
76 if (t == NULL)
77 return (-1);
78 else
79 return (t - s1);
80 }
81 /*
82 * pushback - push character back onto input
83 */
84 void
pushback(int c)85 pushback(int c)
86 {
87 if (c == EOF)
88 return;
89 if (bp >= endpbb)
90 enlarge_bufspace();
91 *bp++ = c;
92 }
93
94 /*
95 * pbstr - push string back onto input
96 * pushback is replicated to improve
97 * performance.
98 */
99 void
pbstr(const char * s)100 pbstr(const char *s)
101 {
102 size_t n;
103
104 n = strlen(s);
105 while (endpbb - bp <= (long)n)
106 enlarge_bufspace();
107 while (n > 0)
108 *bp++ = s[--n];
109 }
110
111 /*
112 * pbnum - convert number to string, push back on input.
113 */
114 void
pbnum(int n)115 pbnum(int n)
116 {
117 pbnumbase(n, 10, 0);
118 }
119
120 void
pbnumbase(int n,int base,int d)121 pbnumbase(int n, int base, int d)
122 {
123 static char digits[36] __nonstring =
124 "0123456789abcdefghijklmnopqrstuvwxyz";
125 unsigned int num;
126 int printed = 0;
127
128 if (base > 36)
129 m4errx(1, "base %d > 36: not supported.", base);
130
131 if (base < 2)
132 m4errx(1, "bad base %d for conversion.", base);
133
134 num = (n < 0) ? -n : n;
135 do {
136 pushback(digits[num % base]);
137 printed++;
138 }
139 while ((num /= base) > 0);
140
141 if (n < 0)
142 printed++;
143 while (printed++ < d)
144 pushback('0');
145
146 if (n < 0)
147 pushback('-');
148 }
149
150 /*
151 * pbunsigned - convert unsigned long to string, push back on input.
152 */
153 void
pbunsigned(unsigned long n)154 pbunsigned(unsigned long n)
155 {
156 do {
157 pushback(n % 10 + '0');
158 }
159 while ((n /= 10) > 0);
160 }
161
162 void
initspaces(void)163 initspaces(void)
164 {
165 int i;
166
167 strspace = xalloc(strsize+1, NULL);
168 ep = strspace;
169 endest = strspace+strsize;
170 buf = xalloc(bufsize, NULL);
171 bufbase = buf;
172 bp = buf;
173 endpbb = buf + bufsize;
174 for (i = 0; i < MAXINP; i++)
175 bbase[i] = buf;
176 }
177
178 void
enlarge_strspace(void)179 enlarge_strspace(void)
180 {
181 char *newstrspace;
182 int i;
183
184 strsize *= 2;
185 newstrspace = malloc(strsize + 1);
186 if (!newstrspace)
187 errx(1, "string space overflow");
188 memcpy(newstrspace, strspace, strsize/2);
189 for (i = 0; i <= sp; i++)
190 if (sstack[i] == STORAGE_STRSPACE)
191 mstack[i].sstr = (mstack[i].sstr - strspace)
192 + newstrspace;
193 ep = (ep-strspace) + newstrspace;
194 free(strspace);
195 strspace = newstrspace;
196 endest = strspace + strsize;
197 }
198
199 void
enlarge_bufspace(void)200 enlarge_bufspace(void)
201 {
202 unsigned char *newbuf;
203 int i;
204
205 bufsize += bufsize/2;
206 newbuf = xrealloc(buf, bufsize, "too many characters pushed back");
207 for (i = 0; i < MAXINP; i++)
208 bbase[i] = (bbase[i]-buf)+newbuf;
209 bp = (bp-buf)+newbuf;
210 bufbase = (bufbase-buf)+newbuf;
211 buf = newbuf;
212 endpbb = buf+bufsize;
213 }
214
215 /*
216 * chrsave - put single char on string space
217 */
218 void
chrsave(int c)219 chrsave(int c)
220 {
221 if (ep >= endest)
222 enlarge_strspace();
223 *ep++ = c;
224 }
225
226 /*
227 * read in a diversion file, and dispose it.
228 */
229 void
getdiv(int n)230 getdiv(int n)
231 {
232 int c;
233
234 if (active == outfile[n])
235 m4errx(1, "undivert: diversion still active.");
236 rewind(outfile[n]);
237 while ((c = getc(outfile[n])) != EOF)
238 putc(c, active);
239 (void) fclose(outfile[n]);
240 outfile[n] = NULL;
241 }
242
243 void
onintr(int signo __unused)244 onintr(int signo __unused)
245 {
246 #define intrmessage "m4: interrupted.\n"
247 write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
248 _exit(1);
249 }
250
251 /*
252 * killdiv - get rid of the diversion files
253 */
254 void
killdiv(void)255 killdiv(void)
256 {
257 int n;
258
259 for (n = 0; n < maxout; n++)
260 if (outfile[n] != NULL) {
261 (void) fclose(outfile[n]);
262 }
263 }
264
265 extern char *__progname;
266
267 void
m4errx(int eval,const char * fmt,...)268 m4errx(int eval, const char *fmt, ...)
269 {
270 fprintf(stderr, "%s: ", __progname);
271 fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE);
272 if (fmt != NULL) {
273 va_list ap;
274
275 va_start(ap, fmt);
276 vfprintf(stderr, fmt, ap);
277 va_end(ap);
278 }
279 fprintf(stderr, "\n");
280 exit(eval);
281 }
282
283 /*
284 * resizedivs: allocate more diversion files */
285 void
resizedivs(int n)286 resizedivs(int n)
287 {
288 int i;
289
290 outfile = xreallocarray(outfile, n, sizeof(FILE *),
291 "too many diverts %d", n);
292 for (i = maxout; i < n; i++)
293 outfile[i] = NULL;
294 maxout = n;
295 }
296
297 void *
xalloc(size_t n,const char * fmt,...)298 xalloc(size_t n, const char *fmt, ...)
299 {
300 void *p = malloc(n);
301
302 if (p == NULL) {
303 if (fmt == NULL)
304 err(1, "malloc");
305 else {
306 va_list va;
307
308 va_start(va, fmt);
309 verr(1, fmt, va);
310 va_end(va);
311 }
312 }
313 return p;
314 }
315
316 void *
xcalloc(size_t n,size_t s,const char * fmt,...)317 xcalloc(size_t n, size_t s, const char *fmt, ...)
318 {
319 void *p = calloc(n, s);
320
321 if (p == NULL) {
322 if (fmt == NULL)
323 err(1, "calloc");
324 else {
325 va_list va;
326
327 va_start(va, fmt);
328 verr(1, fmt, va);
329 va_end(va);
330 }
331 }
332 return p;
333 }
334
335 void *
xrealloc(void * old,size_t n,const char * fmt,...)336 xrealloc(void *old, size_t n, const char *fmt, ...)
337 {
338 char *p = realloc(old, n);
339
340 if (p == NULL) {
341 free(old);
342 if (fmt == NULL)
343 err(1, "realloc");
344 else {
345 va_list va;
346
347 va_start(va, fmt);
348 verr(1, fmt, va);
349 va_end(va);
350 }
351 }
352 return p;
353 }
354
355 void *
xreallocarray(void * old,size_t s1,size_t s2,const char * fmt,...)356 xreallocarray(void *old, size_t s1, size_t s2, const char *fmt, ...)
357 {
358 void *p = reallocarray(old, s1, s2);
359
360 if (p == NULL) {
361 free(old);
362 if (fmt == NULL)
363 err(1, "reallocarray");
364 else {
365 va_list va;
366
367 va_start(va, fmt);
368 verr(1, fmt, va);
369 va_end(va);
370 }
371 }
372 return p;
373 }
374
375 char *
xstrdup(const char * s)376 xstrdup(const char *s)
377 {
378 char *p = strdup(s);
379 if (p == NULL)
380 err(1, "strdup");
381 return p;
382 }
383
384 void
usage(void)385 usage(void)
386 {
387 fprintf(stderr, "usage: m4 [-EgPs] [-Dname[=value]] [-d flags] "
388 "[-I dirname] [-o filename]\n"
389 "\t[-t macro] [-Uname] [file ...]\n");
390 exit(1);
391 }
392
393 int
obtain_char(struct input_file * f)394 obtain_char(struct input_file *f)
395 {
396 if (f->c == EOF)
397 return EOF;
398
399 f->c = fgetc(f->file);
400 if (f->c == '\n')
401 f->lineno++;
402
403 return f->c;
404 }
405
406 void
set_input(struct input_file * f,FILE * real,const char * name)407 set_input(struct input_file *f, FILE *real, const char *name)
408 {
409 f->file = real;
410 f->lineno = 1;
411 f->c = 0;
412 f->name = xstrdup(name);
413 emit_synchline();
414 }
415
416 void
do_emit_synchline(void)417 do_emit_synchline(void)
418 {
419 fprintf(active, "#line %lu \"%s\"\n",
420 infile[ilevel].lineno, infile[ilevel].name);
421 infile[ilevel].synch_lineno = infile[ilevel].lineno;
422 }
423
424 void
release_input(struct input_file * f)425 release_input(struct input_file *f)
426 {
427 if (ferror(f->file))
428 errx(1, "Fatal error reading from %s\n", f->name);
429 if (f->file != stdin)
430 fclose(f->file);
431 f->c = EOF;
432 /*
433 * XXX can't free filename, as there might still be
434 * error information pointing to it.
435 */
436 }
437
438 void
doprintlineno(struct input_file * f)439 doprintlineno(struct input_file *f)
440 {
441 pbunsigned(f->lineno);
442 }
443
444 void
doprintfilename(struct input_file * f)445 doprintfilename(struct input_file *f)
446 {
447 pbstr(rquote);
448 pbstr(f->name);
449 pbstr(lquote);
450 }
451
452 /*
453 * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
454 * and later dump everything that was added since then to a file.
455 */
456 size_t
buffer_mark(void)457 buffer_mark(void)
458 {
459 return bp - buf;
460 }
461
462
463 void
dump_buffer(FILE * f,size_t m)464 dump_buffer(FILE *f, size_t m)
465 {
466 unsigned char *s;
467
468 for (s = bp; s-buf > (long)m;)
469 fputc(*--s, f);
470 }
471