1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/* $OpenBSD: regsub.c,v 1.6 2023/06/30 21:55:09 nicm Exp $ */
/*
* Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <regex.h>
#include <string.h>
#include "tmux.h"
static void
regsub_copy(char **buf, ssize_t *len, const char *text, size_t start, size_t end)
{
size_t add = end - start;
*buf = xrealloc(*buf, (*len) + add + 1);
memcpy((*buf) + *len, text + start, add);
(*len) += add;
}
static void
regsub_expand(char **buf, ssize_t *len, const char *with, const char *text,
regmatch_t *m, u_int n)
{
const char *cp;
u_int i;
for (cp = with; *cp != '\0'; cp++) {
if (*cp == '\\') {
cp++;
if (*cp >= '0' && *cp <= '9') {
i = *cp - '0';
if (i < n && m[i].rm_so != m[i].rm_eo) {
regsub_copy(buf, len, text, m[i].rm_so,
m[i].rm_eo);
continue;
}
}
}
*buf = xrealloc(*buf, (*len) + 2);
(*buf)[(*len)++] = *cp;
}
}
char *
regsub(const char *pattern, const char *with, const char *text, int flags)
{
regex_t r;
regmatch_t m[10];
ssize_t start, end, last, len = 0;
int empty = 0;
char *buf = NULL;
if (*text == '\0')
return (xstrdup(""));
if (regcomp(&r, pattern, flags) != 0)
return (NULL);
start = 0;
last = 0;
end = strlen(text);
while (start <= end) {
if (regexec(&r, text + start, nitems(m), m, 0) != 0) {
regsub_copy(&buf, &len, text, start, end);
break;
}
/*
* Append any text not part of this match (from the end of the
* last match).
*/
regsub_copy(&buf, &len, text, last, m[0].rm_so + start);
/*
* If the last match was empty and this one isn't (it is either
* later or has matched text), expand this match. If it is
* empty, move on one character and try again from there.
*/
if (empty ||
start + m[0].rm_so != last ||
m[0].rm_so != m[0].rm_eo) {
regsub_expand(&buf, &len, with, text + start, m,
nitems(m));
last = start + m[0].rm_eo;
start += m[0].rm_eo;
empty = 0;
} else {
last = start + m[0].rm_eo;
start += m[0].rm_eo + 1;
empty = 1;
}
/* Stop now if anchored to start. */
if (*pattern == '^') {
regsub_copy(&buf, &len, text, start, end);
break;
}
}
buf[len] = '\0';
regfree(&r);
return (buf);
}
|
