1/* re.c: This file contains the regular expression interface routines for
2 the ed line editor. */
3/*-
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#ifndef lint
30#if 0
31static char * const rcsid = "@(#)re.c,v 1.6 1994/02/01 00:34:43 alm Exp";
32#else
33static char * const rcsid =
| 1/* re.c: This file contains the regular expression interface routines for
2 the ed line editor. */
3/*-
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#ifndef lint
30#if 0
31static char * const rcsid = "@(#)re.c,v 1.6 1994/02/01 00:34:43 alm Exp";
32#else
33static char * const rcsid =
|
34 "$FreeBSD: head/bin/ed/re.c 50471 1999-08-27 23:15:48Z peter $";
| 34 "$FreeBSD: head/bin/ed/re.c 77407 2001-05-29 18:03:14Z imp $";
|
35#endif
36#endif /* not lint */
37
38#include "ed.h"
39
40
41extern int patlock;
42
| 35#endif
36#endif /* not lint */
37
38#include "ed.h"
39
40
41extern int patlock;
42
|
43char errmsg[MAXPATHLEN + 40] = "";
| 43char errmsg[PATH_MAX + 40] = "";
|
44
45/* get_compiled_pattern: return pointer to compiled pattern from command
46 buffer */
47pattern_t *
48get_compiled_pattern()
49{
50 static pattern_t *exp = NULL;
51
52 char *exps;
53 char delimiter;
54 int n;
55
56 if ((delimiter = *ibufp) == ' ') {
57 sprintf(errmsg, "invalid pattern delimiter");
58 return NULL;
59 } else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
60 if (!exp) sprintf(errmsg, "no previous pattern");
61 return exp;
62 } else if ((exps = extract_pattern(delimiter)) == NULL)
63 return NULL;
64 /* buffer alloc'd && not reserved */
65 if (exp && !patlock)
66 regfree(exp);
67 else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
68 fprintf(stderr, "%s\n", strerror(errno));
69 sprintf(errmsg, "out of memory");
70 return NULL;
71 }
72 patlock = 0;
73 if ((n = regcomp(exp, exps, 0))) {
74 regerror(n, exp, errmsg, sizeof errmsg);
75 free(exp);
76 return exp = NULL;
77 }
78 return exp;
79}
80
81
82/* extract_pattern: copy a pattern string from the command buffer; return
83 pointer to the copy */
84char *
85extract_pattern(delimiter)
86 int delimiter;
87{
88 static char *lhbuf = NULL; /* buffer */
89 static int lhbufsz = 0; /* buffer size */
90
91 char *nd;
92 int len;
93
94 for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
95 switch (*nd) {
96 default:
97 break;
98 case '[':
99 if ((nd = parse_char_class(++nd)) == NULL) {
100 sprintf(errmsg, "unbalanced brackets ([])");
101 return NULL;
102 }
103 break;
104 case '\\':
105 if (*++nd == '\n') {
106 sprintf(errmsg, "trailing backslash (\\)");
107 return NULL;
108 }
109 break;
110 }
111 len = nd - ibufp;
112 REALLOC(lhbuf, lhbufsz, len + 1, NULL);
113 memcpy(lhbuf, ibufp, len);
114 lhbuf[len] = '\0';
115 ibufp = nd;
116 return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
117}
118
119
120/* parse_char_class: expand a POSIX character class */
121char *
122parse_char_class(s)
123 char *s;
124{
125 int c, d;
126
127 if (*s == '^')
128 s++;
129 if (*s == ']')
130 s++;
131 for (; *s != ']' && *s != '\n'; s++)
132 if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
133 for (s++, c = *++s; *s != ']' || c != d; s++)
134 if ((c = *s) == '\n')
135 return NULL;
136 return (*s == ']') ? s : NULL;
137}
| 44
45/* get_compiled_pattern: return pointer to compiled pattern from command
46 buffer */
47pattern_t *
48get_compiled_pattern()
49{
50 static pattern_t *exp = NULL;
51
52 char *exps;
53 char delimiter;
54 int n;
55
56 if ((delimiter = *ibufp) == ' ') {
57 sprintf(errmsg, "invalid pattern delimiter");
58 return NULL;
59 } else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
60 if (!exp) sprintf(errmsg, "no previous pattern");
61 return exp;
62 } else if ((exps = extract_pattern(delimiter)) == NULL)
63 return NULL;
64 /* buffer alloc'd && not reserved */
65 if (exp && !patlock)
66 regfree(exp);
67 else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
68 fprintf(stderr, "%s\n", strerror(errno));
69 sprintf(errmsg, "out of memory");
70 return NULL;
71 }
72 patlock = 0;
73 if ((n = regcomp(exp, exps, 0))) {
74 regerror(n, exp, errmsg, sizeof errmsg);
75 free(exp);
76 return exp = NULL;
77 }
78 return exp;
79}
80
81
82/* extract_pattern: copy a pattern string from the command buffer; return
83 pointer to the copy */
84char *
85extract_pattern(delimiter)
86 int delimiter;
87{
88 static char *lhbuf = NULL; /* buffer */
89 static int lhbufsz = 0; /* buffer size */
90
91 char *nd;
92 int len;
93
94 for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
95 switch (*nd) {
96 default:
97 break;
98 case '[':
99 if ((nd = parse_char_class(++nd)) == NULL) {
100 sprintf(errmsg, "unbalanced brackets ([])");
101 return NULL;
102 }
103 break;
104 case '\\':
105 if (*++nd == '\n') {
106 sprintf(errmsg, "trailing backslash (\\)");
107 return NULL;
108 }
109 break;
110 }
111 len = nd - ibufp;
112 REALLOC(lhbuf, lhbufsz, len + 1, NULL);
113 memcpy(lhbuf, ibufp, len);
114 lhbuf[len] = '\0';
115 ibufp = nd;
116 return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
117}
118
119
120/* parse_char_class: expand a POSIX character class */
121char *
122parse_char_class(s)
123 char *s;
124{
125 int c, d;
126
127 if (*s == '^')
128 s++;
129 if (*s == ']')
130 s++;
131 for (; *s != ']' && *s != '\n'; s++)
132 if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
133 for (s++, c = *++s; *s != ']' || c != d; s++)
134 if ((c = *s) == '\n')
135 return NULL;
136 return (*s == ']') ? s : NULL;
137}
|