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3185942a JA |
1 | /* |
2 | * shmatch.c -- shell interface to posix regular expression matching. | |
3 | */ | |
4 | ||
a0c0a00f | 5 | /* Copyright (C) 2003-2015 Free Software Foundation, Inc. |
b80f6443 JA |
6 | |
7 | This file is part of GNU Bash, the Bourne Again SHell. | |
8 | ||
3185942a JA |
9 | Bash is free software: you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation, either version 3 of the License, or | |
12 | (at your option) any later version. | |
b80f6443 | 13 | |
3185942a JA |
14 | Bash is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
b80f6443 | 18 | |
3185942a JA |
19 | You should have received a copy of the GNU General Public License |
20 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
b80f6443 JA |
22 | |
23 | #ifdef HAVE_CONFIG_H | |
24 | # include <config.h> | |
25 | #endif | |
26 | ||
27 | #if defined (HAVE_POSIX_REGEXP) | |
28 | ||
29 | #ifdef HAVE_UNISTD_H | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
33 | #include "bashansi.h" | |
34 | ||
35 | #include <stdio.h> | |
36 | #include <regex.h> | |
37 | ||
38 | #include "shell.h" | |
39 | #include "variables.h" | |
40 | #include "externs.h" | |
41 | ||
95732b49 | 42 | extern int glob_ignore_case, match_ignore_case; |
b80f6443 JA |
43 | |
44 | int | |
45 | sh_regmatch (string, pattern, flags) | |
46 | const char *string; | |
47 | const char *pattern; | |
48 | int flags; | |
49 | { | |
50 | regex_t regex = { 0 }; | |
51 | regmatch_t *matches; | |
52 | int rflags; | |
53 | #if defined (ARRAY_VARS) | |
54 | SHELL_VAR *rematch; | |
55 | ARRAY *amatch; | |
56 | int subexp_ind; | |
57 | char *subexp_str; | |
58 | int subexp_len; | |
59 | #endif | |
0628567a | 60 | int result; |
b80f6443 JA |
61 | |
62 | #if defined (ARRAY_VARS) | |
63 | rematch = (SHELL_VAR *)NULL; | |
64 | #endif | |
495aee44 | 65 | |
b80f6443 | 66 | rflags = REG_EXTENDED; |
95732b49 | 67 | if (glob_ignore_case || match_ignore_case) |
b80f6443 JA |
68 | rflags |= REG_ICASE; |
69 | #if !defined (ARRAY_VARS) | |
70 | rflags |= REG_NOSUB; | |
71 | #endif | |
72 | ||
73 | if (regcomp (®ex, pattern, rflags)) | |
74 | return 2; /* flag for printing a warning here. */ | |
75 | ||
76 | #if defined (ARRAY_VARS) | |
77 | matches = (regmatch_t *)malloc (sizeof (regmatch_t) * (regex.re_nsub + 1)); | |
78 | #else | |
79 | matches = NULL; | |
80 | #endif | |
81 | ||
a0c0a00f CR |
82 | /* man regexec: NULL PMATCH ignored if NMATCH == 0 */ |
83 | if (regexec (®ex, string, matches ? regex.re_nsub + 1 : 0, matches, 0)) | |
b80f6443 JA |
84 | result = EXECUTION_FAILURE; |
85 | else | |
86 | result = EXECUTION_SUCCESS; /* match */ | |
87 | ||
88 | #if defined (ARRAY_VARS) | |
89 | subexp_len = strlen (string) + 10; | |
90 | subexp_str = malloc (subexp_len + 1); | |
91 | ||
92 | /* Store the parenthesized subexpressions in the array BASH_REMATCH. | |
93 | Element 0 is the portion that matched the entire regexp. Element 1 | |
94 | is the part that matched the first subexpression, and so on. */ | |
a0c0a00f | 95 | unbind_variable_noref ("BASH_REMATCH"); |
b80f6443 JA |
96 | rematch = make_new_array_variable ("BASH_REMATCH"); |
97 | amatch = array_cell (rematch); | |
98 | ||
a0c0a00f | 99 | if (matches && (flags & SHMAT_SUBEXP) && result == EXECUTION_SUCCESS && subexp_str) |
b80f6443 JA |
100 | { |
101 | for (subexp_ind = 0; subexp_ind <= regex.re_nsub; subexp_ind++) | |
102 | { | |
103 | memset (subexp_str, 0, subexp_len); | |
104 | strncpy (subexp_str, string + matches[subexp_ind].rm_so, | |
105 | matches[subexp_ind].rm_eo - matches[subexp_ind].rm_so); | |
106 | array_insert (amatch, subexp_ind, subexp_str); | |
107 | } | |
108 | } | |
109 | ||
110 | VSETATTR (rematch, att_readonly); | |
111 | ||
112 | free (subexp_str); | |
113 | free (matches); | |
114 | #endif /* ARRAY_VARS */ | |
115 | ||
116 | regfree (®ex); | |
117 | ||
118 | return result; | |
119 | } | |
120 | ||
121 | #endif /* HAVE_POSIX_REGEXP */ |