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
|
/* Construct a regular expression from a literal string.
Copyright (C) 1995, 2010-2011 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2010.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "regex-quote.h"
#include <string.h>
#include "mbuiter.h"
#include "xalloc.h"
/* Characters that are special in a BRE. */
static const char bre_special[] = "$^.*[]\\";
/* Characters that are special in an ERE. */
static const char ere_special[] = "$^.*[]\\+?()";
size_t
regex_quote_length (const char *string, int cflags)
{
const char *special = (cflags != 0 ? ere_special : bre_special);
size_t length;
mbui_iterator_t iter;
length = 0;
for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
{
/* We know that special contains only ASCII characters. */
if (mb_len (mbui_cur (iter)) == 1
&& strchr (special, * mbui_cur_ptr (iter)))
length += 1;
length += mb_len (mbui_cur (iter));
}
return length;
}
/* Copies the quoted string to p and returns the incremented p.
There must be room for regex_quote_length (string, cflags) + 1 bytes at p.
*/
char *
regex_quote_copy (char *p, const char *string, int cflags)
{
const char *special = (cflags != 0 ? ere_special : bre_special);
mbui_iterator_t iter;
for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
{
/* We know that special contains only ASCII characters. */
if (mb_len (mbui_cur (iter)) == 1
&& strchr (special, * mbui_cur_ptr (iter)))
*p++ = '\\';
memcpy (p, mbui_cur_ptr (iter), mb_len (mbui_cur (iter)));
p += mb_len (mbui_cur (iter));
}
return p;
}
/* Returns the freshly allocated quoted string. */
char *
regex_quote (const char *string, int cflags)
{
size_t length = regex_quote_length (string, cflags);
char *result = XNMALLOC (length + 1, char);
char *p;
p = result;
p = regex_quote_copy (p, string, cflags);
*p = '\0';
return result;
}
|
