xref: /dragonfly/usr.bin/m4/misc.c (revision a9898349)
1 /*	$OpenBSD: misc.c,v 1.42 2010/09/07 19:58:09 marco Exp $	*/
2 /*	$NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $	*/
3 
4 /*
5  * Copyright (c) 1989, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Ozan Yigit at York University.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  *
35  * $FreeBSD: src/usr.bin/m4/misc.c,v 1.18 2012/11/17 01:54:24 svnexp Exp $
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 <stdlib.h>
44 #include <stddef.h>
45 #include <string.h>
46 #include <err.h>
47 #include "mdef.h"
48 #include "stdd.h"
49 #include "extern.h"
50 #include "pathnames.h"
51 
52 
53 char *ep;		/* first free char in strspace */
54 static char *strspace;	/* string space for evaluation */
55 char *endest;		/* end of string space	       */
56 static size_t strsize = STRSPMAX;
57 static size_t bufsize = BUFSIZE;
58 
59 unsigned char *buf;			/* push-back buffer	       */
60 unsigned char *bufbase;			/* the base for current ilevel */
61 unsigned char *bbase[MAXINP];		/* the base for each ilevel    */
62 unsigned char *bp;			/* first available character   */
63 unsigned char *endpbb;			/* end of push-back buffer     */
64 
65 
66 /*
67  * find the index of second str in the first str.
68  */
69 ptrdiff_t
indx(const char * s1,const char * s2)70 indx(const char *s1, const char *s2)
71 {
72 	char *t;
73 
74 	t = strstr(s1, s2);
75 	if (t == NULL)
76 		return (-1);
77 	else
78 		return (t - s1);
79 }
80 /*
81  *  pushback - push character back onto input
82  */
83 void
pushback(int c)84 pushback(int c)
85 {
86 	if (c == EOF)
87 		return;
88 	if (bp >= endpbb)
89 		enlarge_bufspace();
90 	*bp++ = c;
91 }
92 
93 /*
94  *  pbstr - push string back onto input
95  *          pushback is replicated to improve
96  *          performance.
97  */
98 void
pbstr(const char * s)99 pbstr(const char *s)
100 {
101 	size_t n;
102 
103 	n = strlen(s);
104 	while (endpbb - bp <= (long)n)
105 		enlarge_bufspace();
106 	while (n > 0)
107 		*bp++ = s[--n];
108 }
109 
110 /*
111  *  pbnum - convert number to string, push back on input.
112  */
113 void
pbnum(int n)114 pbnum(int n)
115 {
116 	pbnumbase(n, 10, 0);
117 }
118 
119 void
pbnumbase(int n,int base,int d)120 pbnumbase(int n, int base, int d)
121 {
122 	static char digits[36] = "0123456789abcdefghijklmnopqrstuvwxyz";
123 	int num;
124 	int printed = 0;
125 
126 	if (base > 36)
127 		m4errx(1, "base %d > 36: not supported.", base);
128 
129 	if (base < 2)
130 		m4errx(1, "bad base %d for conversion.", base);
131 
132 	num = (n < 0) ? -n : n;
133 	do {
134 		pushback(digits[num % base]);
135 		printed++;
136 	}
137 	while ((num /= base) > 0);
138 
139 	if (n < 0)
140 		printed++;
141 	while (printed++ < d)
142 		pushback('0');
143 
144 	if (n < 0)
145 		pushback('-');
146 }
147 
148 /*
149  *  pbunsigned - convert unsigned long to string, push back on input.
150  */
151 void
pbunsigned(unsigned long n)152 pbunsigned(unsigned long n)
153 {
154 	do {
155 		pushback(n % 10 + '0');
156 	}
157 	while ((n /= 10) > 0);
158 }
159 
160 void
initspaces(void)161 initspaces(void)
162 {
163 	int i;
164 
165 	strspace = xalloc(strsize + 1, NULL);
166 	ep = strspace;
167 	endest = strspace + strsize;
168 	buf = (unsigned char *)xalloc(bufsize, NULL);
169 	bufbase = buf;
170 	bp = buf;
171 	endpbb = buf + bufsize;
172 	for (i = 0; i < MAXINP; i++)
173 		bbase[i] = buf;
174 }
175 
176 void
enlarge_strspace(void)177 enlarge_strspace(void)
178 {
179 	char *newstrspace;
180 	int i;
181 
182 	strsize *= 2;
183 	newstrspace = malloc(strsize + 1);
184 	if (!newstrspace)
185 		errx(1, "string space overflow");
186 	memcpy(newstrspace, strspace, strsize/2);
187 	for (i = 0; i <= sp; i++)
188 		if (sstack[i])
189 			mstack[i].sstr = (mstack[i].sstr - strspace) +
190 			    newstrspace;
191 	ep = (ep-strspace) + newstrspace;
192 	free(strspace);
193 	strspace = newstrspace;
194 	endest = strspace + strsize;
195 }
196 
197 void
enlarge_bufspace(void)198 enlarge_bufspace(void)
199 {
200 	unsigned char *newbuf;
201 	int i;
202 
203 	bufsize += bufsize / 2;
204 	newbuf = xrealloc(buf, bufsize, "too many characters pushed back");
205 	for (i = 0; i < MAXINP; i++)
206 		bbase[i] = (bbase[i] - buf) + newbuf;
207 	bp = (bp - buf) + newbuf;
208 	bufbase = (bufbase - buf) + newbuf;
209 	buf = newbuf;
210 	endpbb = buf + bufsize;
211 }
212 
213 /*
214  *  chrsave - put single char on string space
215  */
216 void
chrsave(int c)217 chrsave(int c)
218 {
219 	if (ep >= endest)
220 		enlarge_strspace();
221 	*ep++ = c;
222 }
223 
224 /*
225  * read in a diversion file, and dispose it.
226  */
227 void
getdiv(int n)228 getdiv(int n)
229 {
230 	int c;
231 
232 	if (active == outfile[n])
233 		m4errx(1, "undivert: diversion still active.");
234 	rewind(outfile[n]);
235 	while ((c = getc(outfile[n])) != EOF)
236 		putc(c, active);
237 	fclose(outfile[n]);
238 	outfile[n] = NULL;
239 }
240 
241 void
onintr(int signo __unused)242 onintr(int signo __unused)
243 {
244 #define intrmessage	"m4: interrupted.\n"
245 	write(STDERR_FILENO, intrmessage, sizeof(intrmessage) - 1);
246 	_exit(1);
247 }
248 
249 /*
250  * killdiv - get rid of the diversion files
251  */
252 void
killdiv(void)253 killdiv(void)
254 {
255 	int n;
256 
257 	for (n = 0; n < maxout; n++)
258 		if (outfile[n] != NULL) {
259 			fclose(outfile[n]);
260 		}
261 }
262 
263 extern const char *__progname;
264 
265 void
m4errx(int evaluation,const char * fmt,...)266 m4errx(int evaluation, const char *fmt, ...)
267 {
268 	fprintf(stderr, "%s: ", __progname);
269 	fprintf(stderr, "%s at line %lu: ", CURRENT_NAME, CURRENT_LINE);
270 	if (fmt != NULL) {
271 		va_list ap;
272 
273 		va_start(ap, fmt);
274 		vfprintf(stderr, fmt, ap);
275 		va_end(ap);
276 	}
277 	fprintf(stderr, "\n");
278 	exit(evaluation);
279 }
280 
281 /*
282  * resizedivs: allocate more diversion files */
283 void
resizedivs(int n)284 resizedivs(int n)
285 {
286 	int i;
287 
288 	outfile = (FILE **)xrealloc(outfile, sizeof(FILE *) * n,
289 	    "too many diverts %d", n);
290 	for (i = maxout; i < n; i++)
291 		outfile[i] = NULL;
292 	maxout = n;
293 }
294 
295 void *
xalloc(size_t n,const char * fmt,...)296 xalloc(size_t n, const char *fmt, ...)
297 {
298 	void *p = malloc(n);
299 
300 	if (p == NULL) {
301 		if (fmt == NULL)
302 			err(1, "malloc");
303 		else {
304 			va_list va;
305 
306 			va_start(va, fmt);
307 			verr(1, fmt, va);
308 			va_end(va);
309 		}
310 	}
311 	return p;
312 }
313 
314 void *
xrealloc(void * old,size_t n,const char * fmt,...)315 xrealloc(void *old, size_t n, const char *fmt, ...)
316 {
317 	char *p = realloc(old, n);
318 
319 	if (p == NULL) {
320 		free(old);
321 		if (fmt == NULL)
322 			err(1, "realloc");
323 		else {
324 			va_list va;
325 
326 			va_start(va, fmt);
327 			verr(1, fmt, va);
328 			va_end(va);
329 		}
330 	}
331 	return p;
332 }
333 
334 char *
xstrdup(const char * s)335 xstrdup(const char *s)
336 {
337 	char *p = strdup(s);
338 	if (p == NULL)
339 		err(1, "strdup");
340 	return p;
341 }
342 
343 void
usage(void)344 usage(void)
345 {
346 	fprintf(stderr, "usage: m4 [-gPs] [-Dname[=value]] [-d flags] "
347 			"[-I dirname] [-o filename]\n"
348 			"\t[-t macro] [-Uname] [file ...]\n");
349 	exit(1);
350 }
351 
352 int
obtain_char(struct input_file * f)353 obtain_char(struct input_file *f)
354 {
355 	if (f->c == EOF)
356 		return EOF;
357 
358 	f->c = fgetc(f->file);
359 	if (f->c == '\n')
360 		f->lineno++;
361 
362 	return f->c;
363 }
364 
365 void
set_input(struct input_file * f,FILE * real,const char * name)366 set_input(struct input_file *f, FILE *real, const char *name)
367 {
368 	f->file = real;
369 	f->lineno = 1;
370 	f->c = 0;
371 	f->name = xstrdup(name);
372 	emit_synchline();
373 }
374 
375 void
do_emit_synchline(void)376 do_emit_synchline(void)
377 {
378 	fprintf(active, "#line %lu \"%s\"\n",
379 	    infile[ilevel].lineno, infile[ilevel].name);
380 	infile[ilevel].synch_lineno = infile[ilevel].lineno;
381 }
382 
383 void
release_input(struct input_file * f)384 release_input(struct input_file *f)
385 {
386 	if (f->file != stdin)
387 	    fclose(f->file);
388 	f->c = EOF;
389 	/*
390 	 * XXX can't free filename, as there might still be
391 	 * error information pointing to it.
392 	 */
393 }
394 
395 void
doprintlineno(struct input_file * f)396 doprintlineno(struct input_file *f)
397 {
398 	pbunsigned(f->lineno);
399 }
400 
401 void
doprintfilename(struct input_file * f)402 doprintfilename(struct input_file *f)
403 {
404 	pbstr(rquote);
405 	pbstr(f->name);
406 	pbstr(lquote);
407 }
408 
409 /*
410  * buffer_mark/dump_buffer: allows one to save a mark in a buffer,
411  * and later dump everything that was added since then to a file.
412  */
413 size_t
buffer_mark(void)414 buffer_mark(void)
415 {
416 	return bp - buf;
417 }
418 
419 
420 void
dump_buffer(FILE * f,size_t m)421 dump_buffer(FILE *f, size_t m)
422 {
423 	unsigned char *s;
424 
425 	for (s = bp; s-buf > (long)m;)
426 		fputc(*--s, f);
427 }
428