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pcre_info.c
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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_info(), which gives some
42 information about a compiled pattern. However, use of this function is now
43 deprecated, as it has been superseded by pcre_fullinfo(). */
44 
45 
46 #define HAVE_CONFIG_H
47 #ifdef HAVE_CONFIG_H
48 #include "config.h"
49 #endif
50 
51 #include "pcre_internal.h"
52 
53 
54 /*************************************************
55 * (Obsolete) Return info about compiled pattern *
56 *************************************************/
57 
58 /* This is the original "info" function. It picks potentially useful data out
59 of the private structure, but its interface was too rigid. It remains for
60 backwards compatibility. The public options are passed back in an int - though
61 the re->options field has been expanded to a long int, all the public options
62 at the low end of it, and so even on 16-bit systems this will still be OK.
63 Therefore, I haven't changed the API for pcre_info().
64 
65 Arguments:
66  argument_re points to compiled code
67  optptr where to pass back the options
68  first_byte where to pass back the first character,
69  or -1 if multiline and all branches start ^,
70  or -2 otherwise
71 
72 Returns: number of capturing subpatterns
73  or negative values on error
74 */
75 
76 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
77 pcre_info(const pcre *argument_re, int *optptr, int *first_byte)
78 {
79 real_pcre internal_re;
80 const real_pcre *re = (const real_pcre *)argument_re;
81 if (re == NULL) return PCRE_ERROR_NULL;
82 if (re->magic_number != MAGIC_NUMBER)
83  {
84  re = _pcre_try_flipped(re, &internal_re, NULL, NULL);
85  if (re == NULL) return PCRE_ERROR_BADMAGIC;
86  }
87 if (optptr != NULL) *optptr = (int)(re->options & PUBLIC_COMPILE_OPTIONS);
88 if (first_byte != NULL)
89  *first_byte = ((re->flags & PCRE_FIRSTSET) != 0)? re->first_byte :
90  ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
91 return re->top_bracket;
92 }
93 
94 /* End of pcre_info.c */