/[pcre]/code/trunk/pcre_fullinfo.c
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Contents of /code/trunk/pcre_fullinfo.c

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Revision 455 - (show annotations) (download)
Sat Sep 26 19:12:32 2009 UTC (4 years, 9 months ago) by ph10
File MIME type: text/plain
File size: 5581 byte(s)
Added lower bound length-finding to pcre_study() and use it when matching; make 
the value available via pcre_fullinfo(); also fixed bugs connected with
pcre_study() in pcre_dfa_exec(). 

1 /*************************************************
2 * Perl-Compatible Regular Expressions *
3 *************************************************/
4
5 /* PCRE is a library of functions to support regular expressions whose syntax
6 and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2009 University of Cambridge
10
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14
15 * Redistributions of source code must retain the above copyright notice,
16 this list of conditions and the following disclaimer.
17
18 * Redistributions in binary form must reproduce the above copyright
19 notice, this list of conditions and the following disclaimer in the
20 documentation and/or other materials provided with the distribution.
21
22 * Neither the name of the University of Cambridge nor the names of its
23 contributors may be used to endorse or promote products derived from
24 this software without specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 POSSIBILITY OF SUCH DAMAGE.
37 -----------------------------------------------------------------------------
38 */
39
40
41 /* This module contains the external function pcre_fullinfo(), which returns
42 information about a compiled pattern. */
43
44
45 #ifdef HAVE_CONFIG_H
46 #include "config.h"
47 #endif
48
49 #include "pcre_internal.h"
50
51
52 /*************************************************
53 * Return info about compiled pattern *
54 *************************************************/
55
56 /* This is a newer "info" function which has an extensible interface so
57 that additional items can be added compatibly.
58
59 Arguments:
60 argument_re points to compiled code
61 extra_data points extra data, or NULL
62 what what information is required
63 where where to put the information
64
65 Returns: 0 if data returned, negative on error
66 */
67
68 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
69 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data, int what,
70 void *where)
71 {
72 real_pcre internal_re;
73 pcre_study_data internal_study;
74 const real_pcre *re = (const real_pcre *)argument_re;
75 const pcre_study_data *study = NULL;
76
77 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
78
79 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
80 study = (const pcre_study_data *)extra_data->study_data;
81
82 if (re->magic_number != MAGIC_NUMBER)
83 {
84 re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
85 if (re == NULL) return PCRE_ERROR_BADMAGIC;
86 if (study != NULL) study = &internal_study;
87 }
88
89 switch (what)
90 {
91 case PCRE_INFO_OPTIONS:
92 *((unsigned long int *)where) = re->options & PUBLIC_COMPILE_OPTIONS;
93 break;
94
95 case PCRE_INFO_SIZE:
96 *((size_t *)where) = re->size;
97 break;
98
99 case PCRE_INFO_STUDYSIZE:
100 *((size_t *)where) = (study == NULL)? 0 : study->size;
101 break;
102
103 case PCRE_INFO_CAPTURECOUNT:
104 *((int *)where) = re->top_bracket;
105 break;
106
107 case PCRE_INFO_BACKREFMAX:
108 *((int *)where) = re->top_backref;
109 break;
110
111 case PCRE_INFO_FIRSTBYTE:
112 *((int *)where) =
113 ((re->flags & PCRE_FIRSTSET) != 0)? re->first_byte :
114 ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
115 break;
116
117 /* Make sure we pass back the pointer to the bit vector in the external
118 block, not the internal copy (with flipped integer fields). */
119
120 case PCRE_INFO_FIRSTTABLE:
121 *((const uschar **)where) =
122 (study != NULL && (study->flags & PCRE_STUDY_MAPPED) != 0)?
123 ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
124 break;
125
126 case PCRE_INFO_MINLENGTH:
127 *((int *)where) =
128 (study != NULL && (study->flags & PCRE_STUDY_MINLEN) != 0)?
129 study->minlength : -1;
130 break;
131
132 case PCRE_INFO_LASTLITERAL:
133 *((int *)where) =
134 ((re->flags & PCRE_REQCHSET) != 0)? re->req_byte : -1;
135 break;
136
137 case PCRE_INFO_NAMEENTRYSIZE:
138 *((int *)where) = re->name_entry_size;
139 break;
140
141 case PCRE_INFO_NAMECOUNT:
142 *((int *)where) = re->name_count;
143 break;
144
145 case PCRE_INFO_NAMETABLE:
146 *((const uschar **)where) = (const uschar *)re + re->name_table_offset;
147 break;
148
149 case PCRE_INFO_DEFAULT_TABLES:
150 *((const uschar **)where) = (const uschar *)(_pcre_default_tables);
151 break;
152
153 /* From release 8.00 this will always return TRUE because NOPARTIAL is
154 no longer ever set (the restrictions have been removed). */
155
156 case PCRE_INFO_OKPARTIAL:
157 *((int *)where) = (re->flags & PCRE_NOPARTIAL) == 0;
158 break;
159
160 case PCRE_INFO_JCHANGED:
161 *((int *)where) = (re->flags & PCRE_JCHANGED) != 0;
162 break;
163
164 case PCRE_INFO_HASCRORLF:
165 *((int *)where) = (re->flags & PCRE_HASCRORLF) != 0;
166 break;
167
168 default: return PCRE_ERROR_BADOPTION;
169 }
170
171 return 0;
172 }
173
174 /* End of pcre_fullinfo.c */

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