1 /* $OpenBSD: gnum4.c,v 1.42 2011/11/06 12:25:43 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 1.15 2012/11/17 01:54:24 svnexp 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 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
62 static struct path_entry {
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);
125 static struct input_file *
126 dopath(struct input_file *i, const char *filename)
128 char path[MAXPATHLEN];
129 struct path_entry *pe;
132 for (pe = first; pe; pe = pe->next) {
133 snprintf(path, sizeof(path), "%s/%s", pe->name, filename);
134 if ((f = fopen(path, "r")) != NULL) {
135 set_input(i, f, path);
143 fopen_trypath(struct input_file *i, const char *filename)
147 f = fopen(filename, "r");
149 set_input(i, f, filename);
152 if (filename[0] == '/')
157 return dopath(i, filename);
161 doindir(const char *argv[], int argc)
164 struct macro_definition *p = NULL;
167 if (n == NULL || (p = macro_getdef(n)) == NULL)
168 m4errx(1, "indir: undefined macro %s.", argv[2]);
171 eval(argv + 1, argc - 1, p->type, is_traced(n));
175 dobuiltin(const char *argv[], int argc)
180 p = macro_getbuiltin(argv[2]);
182 eval(argv + 1, argc - 1, macro_builtin_type(p), is_traced(p));
184 m4errx(1, "unknown builtin %s.", argv[2]);
188 /* We need some temporary buffer space, as pb pushes BACK and substitution
189 * proceeds forward... */
191 static size_t bufsize = 0;
192 static size_t current = 0;
194 static void addchars(const char *, size_t);
195 static void addchar(int);
196 static char *twiddle(const char *);
197 static char *getstring(void);
198 static void exit_regerror(int, regex_t *);
199 static void do_subst(const char *, regex_t *, const char *, regmatch_t *);
200 static void do_regexpindex(const char *, regex_t *, regmatch_t *);
201 static void do_regexp(const char *, regex_t *, const char *, regmatch_t *);
202 static void add_sub(int, const char *, regex_t *, regmatch_t *);
203 static void add_replace(const char *, regex_t *, const char *, regmatch_t *);
204 #define addconstantstring(s) addchars((s), sizeof(s)-1)
207 addchars(const char *c, size_t n)
211 while (current + n > bufsize) {
216 buffer = xrealloc(buffer, bufsize, NULL);
218 memcpy(buffer + current, c, n);
225 if (current + 1 > bufsize) {
230 buffer = xrealloc(buffer, bufsize, NULL);
232 buffer[current++] = c;
245 exit_regerror(int er, regex_t *re)
250 errlen = regerror(er, re, NULL, 0);
251 errbuf = xalloc(errlen,
252 "malloc in regerror: %lu", (unsigned long)errlen);
253 regerror(er, re, errbuf, errlen);
254 m4errx(1, "regular expression error: %s.", errbuf);
258 add_sub(int n, const char *string, regex_t *re, regmatch_t *pm)
260 if (n > (int)re->re_nsub)
261 warnx("No subexpression %d", n);
262 /* Subexpressions that did not match are
264 else if (pm[n].rm_so != -1 && pm[n].rm_eo != -1)
265 addchars(string + pm[n].rm_so, pm[n].rm_eo - pm[n].rm_so);
268 /* Add replacement string to the output buffer, recognizing special
269 * constructs and replacing them with substrings of the original string.
272 add_replace(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
276 for (p = replace; *p != '\0'; p++) {
277 if (*p == '&' && !mimic_gnu) {
278 add_sub(0, string, re, pm);
289 add_sub(0, string, re, pm);
296 add_sub(*(++p) - '0', string, re, pm);
305 do_subst(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
309 const char *last_match = NULL;
311 while ((error = regexec(re, string, re->re_nsub + 1, pm, flags)) == 0) {
312 if (pm[0].rm_eo != 0) {
313 if (string[pm[0].rm_eo - 1] == '\n')
319 /* NULL length matches are special... We use the `vi-mode'
320 * rule: don't allow a NULL-match at the last match
323 if (pm[0].rm_so == pm[0].rm_eo &&
324 string + pm[0].rm_so == last_match) {
328 if (*string++ == '\n')
334 last_match = string + pm[0].rm_so;
335 addchars(string, pm[0].rm_so);
336 add_replace(string, re, replace, pm);
337 string += pm[0].rm_eo;
339 if (error != REG_NOMATCH)
340 exit_regerror(error, re);
345 do_regexp(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
349 switch(error = regexec(re, string, re->re_nsub + 1, pm, 0)) {
351 add_replace(string, re, replace, pm);
357 exit_regerror(error, re);
362 do_regexpindex(const char *string, regex_t *re, regmatch_t *pm)
366 switch(error = regexec(re, string, re->re_nsub + 1, pm, 0)) {
368 pbunsigned(pm[0].rm_so);
374 exit_regerror(error, re);
378 /* In Gnu m4 mode, parentheses for backmatch don't work like POSIX 1003.2
379 * says. So we twiddle with the regexp before passing it to regcomp.
382 twiddle(const char *p)
384 /* + at start of regexp is a normal character for Gnu m4 */
391 /* This could use strcspn for speed... */
401 addconstantstring("[_a-zA-Z0-9]");
404 addconstantstring("[^_a-zA-Z0-9]");
407 addconstantstring("[[:<:]]");
410 addconstantstring("[[:>:]]");
419 if (*p == '(' || *p == ')' || *p == '|')
428 /* patsubst(string, regexp, opt replacement) */
434 dopatsubst(const char *argv[], int argc)
437 warnx("Too few arguments to patsubst");
440 /* special case: empty regexp */
441 if (argv[3][0] == '\0') {
444 if (argc > 4 && argv[4])
445 len = strlen(argv[4]);
448 for (s = argv[2]; *s != '\0'; s++) {
449 addchars(argv[4], len);
456 int mode = REG_EXTENDED;
457 size_t l = strlen(argv[3]);
460 (argv[3][0] == '^') ||
461 (l > 0 && argv[3][l-1] == '$'))
464 error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
467 exit_regerror(error, &re);
469 pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub + 1), NULL);
470 do_subst(argv[2], &re,
471 argc > 4 && argv[4] != NULL ? argv[4] : "", pmatch);
479 doregexp(const char *argv[], int argc)
486 warnx("Too few arguments to regexp");
489 /* special gnu case */
490 if (argv[3][0] == '\0' && mimic_gnu) {
491 if (argc == 4 || argv[4] == NULL)
496 error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
497 REG_EXTENDED|REG_NEWLINE);
499 exit_regerror(error, &re);
501 pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub + 1), NULL);
502 if (argc == 4 || argv[4] == NULL)
503 do_regexpindex(argv[2], &re, pmatch);
505 do_regexp(argv[2], &re, argv[4], pmatch);
511 doformat(const char *argv[], int argc)
513 const char *format = argv[2];
518 const char *thisarg = NULL;
522 while (*format != 0) {
523 if (*format != '%') {
529 if (*format == '%') {
538 if (*format == '*') {
542 "Format with too many format specifiers.");
543 width = strtol(argv[pos++], NULL, 10);
545 width = strtol(format, __DECONST(char **, &format), 10);
553 if (*format == '.') {
555 if (*format == '*') {
559 "Format with too many format specifiers.");
560 extra = strtol(argv[pos++], NULL, 10);
562 extra = strtol(format, __DECONST(char **, &format), 10);
568 m4errx(1, "Format with too many format specifiers.");
571 thisarg = argv[pos++];
574 temp[0] = strtoul(argv[pos++], NULL, 10);
579 m4errx(1, "Unsupported format specification: %s.",
587 while ((long)l < width--)
590 addchars(thisarg, l);
592 while ((long)l < width--)
600 doesyscmd(const char *cmd)
608 /* Follow gnu m4 documentation: first flush buffers. */
611 argv[0] = __DECONST(char *, "sh");
612 argv[1] = __DECONST(char *, "-c");
613 argv[2] = __DECONST(char *, cmd);
616 /* Just set up standard output, share stderr and stdin with m4 */
619 switch(cpid = fork()) {
627 execv(_PATH_BSHELL, argv);
630 /* Read result in two stages, since m4's buffer is
634 char result[BUFSIZE];
635 cc = read(p[0], result, sizeof result);
637 addchars(result, cc);
638 } while (cc > 0 || (cc == -1 && errno == EINTR));
641 while ((pid = wait(&status)) != cpid && pid >= 0)
648 getdivfile(const char *name)
653 f = fopen(name, "r");
657 while ((c = getc(f)) != EOF)