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

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Revision 172 - (hide annotations) (download)
Tue Jun 5 10:40:13 2007 UTC (7 years, 5 months ago) by ph10
File MIME type: text/plain
File size: 5119 byte(s)
Drastically reduce workspace used for alternatives in groups; also some 
trailing space removals for a test release.

1 nigel 77 /*************************************************
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 ph10 117 Copyright (c) 1997-2007 University of Cambridge
10 nigel 77
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     #include "pcre_internal.h"
46    
47    
48     /*************************************************
49     * Return info about compiled pattern *
50     *************************************************/
51    
52     /* This is a newer "info" function which has an extensible interface so
53     that additional items can be added compatibly.
54    
55     Arguments:
56     argument_re points to compiled code
57     extra_data points extra data, or NULL
58     what what information is required
59     where where to put the information
60    
61     Returns: 0 if data returned, negative on error
62     */
63    
64 ph10 145 PCRE_EXP_DEFN int
65 nigel 77 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data, int what,
66     void *where)
67     {
68     real_pcre internal_re;
69     pcre_study_data internal_study;
70     const real_pcre *re = (const real_pcre *)argument_re;
71     const pcre_study_data *study = NULL;
72    
73     if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
74    
75     if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
76     study = (const pcre_study_data *)extra_data->study_data;
77    
78     if (re->magic_number != MAGIC_NUMBER)
79     {
80     re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
81     if (re == NULL) return PCRE_ERROR_BADMAGIC;
82     if (study != NULL) study = &internal_study;
83     }
84    
85     switch (what)
86     {
87     case PCRE_INFO_OPTIONS:
88     *((unsigned long int *)where) = re->options & PUBLIC_OPTIONS;
89     break;
90    
91     case PCRE_INFO_SIZE:
92     *((size_t *)where) = re->size;
93     break;
94    
95     case PCRE_INFO_STUDYSIZE:
96     *((size_t *)where) = (study == NULL)? 0 : study->size;
97     break;
98    
99     case PCRE_INFO_CAPTURECOUNT:
100     *((int *)where) = re->top_bracket;
101     break;
102    
103     case PCRE_INFO_BACKREFMAX:
104     *((int *)where) = re->top_backref;
105     break;
106    
107     case PCRE_INFO_FIRSTBYTE:
108     *((int *)where) =
109     ((re->options & PCRE_FIRSTSET) != 0)? re->first_byte :
110     ((re->options & PCRE_STARTLINE) != 0)? -1 : -2;
111     break;
112    
113     /* Make sure we pass back the pointer to the bit vector in the external
114     block, not the internal copy (with flipped integer fields). */
115    
116     case PCRE_INFO_FIRSTTABLE:
117     *((const uschar **)where) =
118     (study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0)?
119     ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
120     break;
121    
122     case PCRE_INFO_LASTLITERAL:
123     *((int *)where) =
124     ((re->options & PCRE_REQCHSET) != 0)? re->req_byte : -1;
125     break;
126    
127     case PCRE_INFO_NAMEENTRYSIZE:
128     *((int *)where) = re->name_entry_size;
129     break;
130    
131     case PCRE_INFO_NAMECOUNT:
132     *((int *)where) = re->name_count;
133     break;
134    
135     case PCRE_INFO_NAMETABLE:
136     *((const uschar **)where) = (const uschar *)re + re->name_table_offset;
137     break;
138    
139     case PCRE_INFO_DEFAULT_TABLES:
140     *((const uschar **)where) = (const uschar *)(_pcre_default_tables);
141     break;
142 ph10 172
143 ph10 169 case PCRE_INFO_OKPARTIAL:
144 ph10 172 *((int *)where) = (re->options & PCRE_NOPARTIAL) == 0;
145 ph10 169 break;
146 ph10 172
147 ph10 169 case PCRE_INFO_JCHANGED:
148     *((int *)where) = (re->options & PCRE_JCHANGED) != 0;
149 ph10 172 break;
150 nigel 77
151     default: return PCRE_ERROR_BADOPTION;
152     }
153    
154     return 0;
155     }
156    
157     /* End of pcre_fullinfo.c */

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