1 /* $OpenBSD: gnum4.c,v 1.18 2002/04/26 16:15:16 espie Exp $ */
4 * Copyright (c) 1999 Marc Espie
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * $FreeBSD: src/usr.bin/m4/gnum4.c,v 1.9 2004/05/18 15:53:58 stefanf Exp $
31 * functions needed to support gnu-m4 extensions, including a fake freezing
34 #include <sys/param.h>
35 #include <sys/types.h>
55 * Support for include path search
56 * First search in the the current directory.
57 * If not found, and the path is not absolute, include path kicks in.
58 * First, -I options, in the order found on the command line.
59 * Then M4PATH env variable
64 struct path_entry *next;
67 static struct path_entry *new_path_entry(const char *);
68 static void ensure_m4path(void);
69 static struct input_file *dopath(struct input_file *, const char *);
71 static struct path_entry *
72 new_path_entry(const char *dirname)
76 n = malloc(sizeof(struct path_entry));
78 errx(1, "out of memory");
79 n->name = strdup(dirname);
81 errx(1, "out of memory");
87 addtoincludepath(const char *dirname)
91 n = new_path_entry(dirname);
104 static int envpathdone = 0;
112 envpath = getenv("M4PATH");
115 /* for portability: getenv result is read-only */
116 envpath = strdup(envpath);
118 errx(1, "out of memory");
119 for (sweep = envpath;
120 (path = strsep(&sweep, ":")) != NULL;)
121 addtoincludepath(path);
127 dopath(struct input_file *i, const char *filename)
129 char path[MAXPATHLEN];
130 struct path_entry *pe;
133 for (pe = first; pe; pe = pe->next) {
134 snprintf(path, sizeof(path), "%s/%s", pe->name, filename);
135 if ((f = fopen(path, "r")) != NULL) {
136 set_input(i, f, path);
144 fopen_trypath(struct input_file *i, const char *filename)
148 f = fopen(filename, "r");
150 set_input(i, f, filename);
153 if (filename[0] == '/')
158 return dopath(i, filename);
162 doindir(const char *argv[], int argc)
168 errx(1, "undefined macro %s", argv[2]);
170 eval(argv+1, argc-1, p->type);
174 dobuiltin(const char *argv[], int argc)
178 n = builtin_type(argv[2]);
180 eval(argv+1, argc-1, n);
182 errx(1, "unknown builtin %s", argv[2]);
186 /* We need some temporary buffer space, as pb pushes BACK and substitution
187 * proceeds forward... */
189 static size_t bufsize = 0;
190 static size_t current = 0;
192 static void addchars(const char *, size_t);
193 static void addchar(int);
194 static char *twiddle(const char *);
195 static char *getstring(void);
196 static void exit_regerror(int, regex_t *);
197 static void do_subst(const char *, regex_t *, const char *, regmatch_t *);
198 static void do_regexpindex(const char *, regex_t *, regmatch_t *);
199 static void do_regexp(const char *, regex_t *, const char *, regmatch_t *);
200 static void add_sub(size_t, const char *, regex_t *, regmatch_t *);
201 static void add_replace(const char *, regex_t *, const char *, regmatch_t *);
202 #define addconstantstring(s) addchars((s), sizeof(s)-1)
205 addchars(const char *c, size_t n)
209 while (current + n > bufsize) {
214 buffer = realloc(buffer, bufsize);
216 errx(1, "out of memory");
218 memcpy(buffer+current, c, n);
225 if (current +1 > bufsize) {
230 buffer = realloc(buffer, bufsize);
232 errx(1, "out of memory");
234 buffer[current++] = c;
247 exit_regerror(int er, regex_t *re)
252 errlen = regerror(er, re, NULL, 0);
253 errbuf = xalloc(errlen);
254 regerror(er, re, errbuf, errlen);
255 errx(1, "regular expression error: %s", errbuf);
259 add_sub(size_t n, const char *string, regex_t *re, regmatch_t *pm)
262 warnx("No subexpression %zu", n);
263 /* Subexpressions that did not match are
265 else if (pm[n].rm_so != -1 &&
267 addchars(string + pm[n].rm_so,
268 pm[n].rm_eo - pm[n].rm_so);
272 /* Add replacement string to the output buffer, recognizing special
273 * constructs and replacing them with substrings of the original string.
276 add_replace(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
280 for (p = replace; *p != '\0'; p++) {
281 if (*p == '&' && !mimic_gnu) {
282 add_sub(0, string, re, pm);
293 add_sub(0, string, re, pm);
300 add_sub(*(++p) - '0', string, re, pm);
309 do_subst(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
313 const char *last_match = NULL;
315 while ((error = regexec(re, string, re->re_nsub+1, pm, flags)) == 0) {
316 if (pm[0].rm_eo != 0) {
317 if (string[pm[0].rm_eo-1] == '\n')
323 /* NULL length matches are special... We use the `vi-mode'
324 * rule: don't allow a NULL-match at the last match
327 if (pm[0].rm_so == pm[0].rm_eo &&
328 string + pm[0].rm_so == last_match) {
332 if (*string++ == '\n')
338 last_match = string + pm[0].rm_so;
339 addchars(string, pm[0].rm_so);
340 add_replace(string, re, replace, pm);
341 string += pm[0].rm_eo;
343 if (error != REG_NOMATCH)
344 exit_regerror(error, re);
349 do_regexp(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
353 switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
355 add_replace(string, re, replace, pm);
361 exit_regerror(error, re);
366 do_regexpindex(const char *string, regex_t *re, regmatch_t *pm)
370 switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
372 pbunsigned(pm[0].rm_so);
378 exit_regerror(error, re);
382 /* In Gnu m4 mode, parentheses for backmatch don't work like POSIX 1003.2
383 * says. So we twiddle with the regexp before passing it to regcomp.
386 twiddle(const char *p)
388 /* This could use strcspn for speed... */
398 addconstantstring("[_a-zA-Z0-9]");
401 addconstantstring("[^_a-zA-Z0-9]");
404 addconstantstring("[[:<:]]");
407 addconstantstring("[[:>:]]");
416 if (*p == '(' || *p == ')' || *p == '|')
425 /* patsubst(string, regexp, opt replacement) */
431 dopatsubst(const char *argv[], int argc)
438 warnx("Too few arguments to patsubst");
441 error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
442 REG_NEWLINE | REG_EXTENDED);
444 exit_regerror(error, &re);
446 pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
447 do_subst(argv[2], &re,
448 argc != 4 && argv[4] != NULL ? argv[4] : "", pmatch);
455 doregexp(const char *argv[], int argc)
462 warnx("Too few arguments to regexp");
465 error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
468 exit_regerror(error, &re);
470 pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
471 if (argv[4] == NULL || argc == 4)
472 do_regexpindex(argv[2], &re, pmatch);
474 do_regexp(argv[2], &re, argv[4], pmatch);
480 doesyscmd(const char *cmd)
487 /* Follow gnu m4 documentation: first flush buffers. */
490 /* Just set up standard output, share stderr and stdin with m4 */
493 switch(cpid = fork()) {
499 (void) dup2(p[1], 1);
501 execl(_PATH_BSHELL, "sh", "-c", cmd, NULL);
504 /* Read result in two stages, since m4's buffer is
508 char result[BUFSIZE];
509 cc = read(p[0], result, sizeof result);
511 addchars(result, cc);
512 } while (cc > 0 || (cc == -1 && errno == EINTR));
515 while ((pid = wait(&status)) != cpid && pid >= 0)