1 /* re.c: This file contains the regular expression interface routines for
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * @(#)re.c,v 1.6 1994/02/01 00:34:43 alm Exp
29 * $FreeBSD: src/bin/ed/re.c,v 1.15.2.1 2001/08/01 02:36:03 obrien Exp $
30 * $DragonFly: src/bin/ed/re.c,v 1.3 2003/09/28 14:39:14 hmp Exp $
38 char errmsg[PATH_MAX + 40] = "";
40 /* get_compiled_pattern: return pointer to compiled pattern from command
43 get_compiled_pattern(void)
45 static pattern_t *exp = NULL;
51 if ((delimiter = *ibufp) == ' ') {
52 sprintf(errmsg, "invalid pattern delimiter");
54 } else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
55 if (!exp) sprintf(errmsg, "no previous pattern");
57 } else if ((exps = extract_pattern(delimiter)) == NULL)
59 /* buffer alloc'd && not reserved */
62 else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
63 fprintf(stderr, "%s\n", strerror(errno));
64 sprintf(errmsg, "out of memory");
68 if ((n = regcomp(exp, exps, 0))) {
69 regerror(n, exp, errmsg, sizeof errmsg);
77 /* extract_pattern: copy a pattern string from the command buffer; return
78 pointer to the copy */
80 extract_pattern(int delimiter)
82 static char *lhbuf = NULL; /* buffer */
83 static int lhbufsz = 0; /* buffer size */
88 for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
93 if ((nd = parse_char_class(++nd)) == NULL) {
94 sprintf(errmsg, "unbalanced brackets ([])");
100 sprintf(errmsg, "trailing backslash (\\)");
106 REALLOC(lhbuf, lhbufsz, len + 1, NULL);
107 memcpy(lhbuf, ibufp, len);
110 return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
114 /* parse_char_class: expand a POSIX character class */
116 parse_char_class(char *s)
124 for (; *s != ']' && *s != '\n'; s++)
125 if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
126 for (s++, c = *++s; *s != ']' || c != d; s++)
127 if ((c = *s) == '\n')
129 return (*s == ']') ? s : NULL;