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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_lib.h"
#include "apr_pools.h"
#include "apr_strings.h"
#include "ap_config.h"
#include "ap_regex.h"
#include "httpd.h"
static apr_status_t rxplus_cleanup(void *preg)
{
ap_regfree((ap_regex_t *) preg);
return APR_SUCCESS;
}
AP_DECLARE(ap_rxplus_t*) ap_rxplus_compile(apr_pool_t *pool,
const char *pattern)
{
/* perl style patterns
* add support for more as and when wanted
* substitute: s/rx/subs/
* match: m/rx/ or just /rx/
*/
/* allow any nonalnum delimiter as first or second char.
* If we ever use this with non-string pattern we'll need an extra check
*/
const char *endp = 0;
const char *str = pattern;
const char *rxstr;
ap_rxplus_t *ret = apr_pcalloc(pool, sizeof(ap_rxplus_t));
char delim = 0;
enum { SUBSTITUTE = 's', MATCH = 'm'} action = MATCH;
if (!apr_isalnum(pattern[0])) {
delim = *str++;
}
else if (pattern[0] == 's' && !apr_isalnum(pattern[1])) {
action = SUBSTITUTE;
delim = pattern[1];
str += 2;
}
else if (pattern[0] == 'm' && !apr_isalnum(pattern[1])) {
delim = pattern[1];
str += 2;
}
/* TODO: support perl's after/before */
/* FIXME: fix these simplminded delims */
/* we think there's a delimiter. Allow for it not to be if unmatched */
if (delim) {
endp = ap_strchr_c(str, delim);
}
if (!endp) { /* there's no delim or flags */
if (ap_regcomp(&ret->rx, pattern, 0) == 0) {
apr_pool_cleanup_register(pool, &ret->rx, rxplus_cleanup,
apr_pool_cleanup_null);
return ret;
}
else {
return NULL;
}
}
/* We have a delimiter. Use it to extract the regexp */
rxstr = apr_pstrndup(pool, str, endp-str);
/* If it's a substitution, we need the replacement string
* TODO: possible future enhancement - support other parsing
* in the replacement string.
*/
if (action == SUBSTITUTE) {
str = endp+1;
if (!*str || (endp = ap_strchr_c(str, delim), !endp)) {
/* missing replacement string is an error */
return NULL;
}
ret->subs = apr_pstrndup(pool, str, (endp-str));
}
/* anything after the current delimiter is flags */
while (*++endp) {
switch (*endp) {
case 'i': ret->flags |= AP_REG_ICASE; break;
case 'm': ret->flags |= AP_REG_NEWLINE; break;
case 'n': ret->flags |= AP_REG_NOMEM; break;
case 'g': ret->flags |= AP_REG_MULTI; break;
case 's': ret->flags |= AP_REG_DOTALL; break;
case '^': ret->flags |= AP_REG_NOTBOL; break;
case '$': ret->flags |= AP_REG_NOTEOL; break;
default: break; /* we should probably be stricter here */
}
}
if (ap_regcomp(&ret->rx, rxstr, ret->flags) == 0) {
apr_pool_cleanup_register(pool, &ret->rx, rxplus_cleanup,
apr_pool_cleanup_null);
}
else {
return NULL;
}
if (!(ret->flags & AP_REG_NOMEM)) {
/* count size of memory required, starting at 1 for the whole-match
* Simpleminded should be fine 'cos regcomp already checked syntax
*/
ret->nmatch = 1;
while (*rxstr) {
switch (*rxstr++) {
case '\\': /* next char is escaped - skip it */
if (*rxstr != 0) {
++rxstr;
}
break;
case '(': /* unescaped bracket implies memory */
++ret->nmatch;
break;
default:
break;
}
}
ret->pmatch = apr_palloc(pool, ret->nmatch*sizeof(ap_regmatch_t));
}
return ret;
}
AP_DECLARE(int) ap_rxplus_exec(apr_pool_t *pool, ap_rxplus_t *rx,
const char *pattern, char **newpattern)
{
int ret = 1;
int startl, oldl, newl, diffsz;
const char *remainder;
char *subs;
/* snrf process_regexp from mod_headers */
if (ap_regexec(&rx->rx, pattern, rx->nmatch, rx->pmatch, rx->flags) != 0) {
rx->match = NULL;
return 0; /* no match, nothing to do */
}
rx->match = pattern;
if (rx->subs) {
*newpattern = ap_pregsub(pool, rx->subs, pattern,
rx->nmatch, rx->pmatch);
if (!*newpattern) {
return 0; /* FIXME - should we do more to handle error? */
}
startl = rx->pmatch[0].rm_so;
oldl = rx->pmatch[0].rm_eo - startl;
newl = strlen(*newpattern);
diffsz = newl - oldl;
remainder = pattern + startl + oldl;
if (rx->flags & AP_REG_MULTI) {
/* recurse to do any further matches */
char *subs;
ret += ap_rxplus_exec(pool, rx, remainder, &subs);
if (ret > 1) {
/* a further substitution happened */
diffsz += strlen(subs) - strlen(remainder);
remainder = subs;
}
}
subs = apr_palloc(pool, strlen(pattern) + 1 + diffsz);
memcpy(subs, pattern, startl);
memcpy(subs+startl, *newpattern, newl);
strcpy(subs+startl+newl, remainder);
*newpattern = subs;
}
return ret;
}
#ifdef DOXYGEN
AP_DECLARE(int) ap_rxplus_nmatch(ap_rxplus_t *rx)
{
return (rx->match != NULL) ? rx->nmatch : 0;
}
#endif
/* If this blows up on you, see the notes in the header/apidoc
* rx->match is a pointer and it's your responsibility to ensure
* it hasn't gone out-of-scope since the last ap_rxplus_exec
*/
AP_DECLARE(void) ap_rxplus_match(ap_rxplus_t *rx, int n, int *len,
const char **match)
{
if (n >= 0 && n < ap_rxplus_nmatch(rx)) {
*match = rx->match + rx->pmatch[n].rm_so;
*len = rx->pmatch[n].rm_eo - rx->pmatch[n].rm_so;
}
else {
*len = -1;
*match = NULL;
}
}
AP_DECLARE(char*) ap_rxplus_pmatch(apr_pool_t *pool, ap_rxplus_t *rx, int n)
{
int len;
const char *match;
ap_rxplus_match(rx, n, &len, &match);
return (match != NULL) ? apr_pstrndup(pool, match, len) : NULL;
}
|
