src/src/pcre/pcre_fullinfo.c

   1 /* $Cambridge: exim/src/src/pcre/pcre_fullinfo.c,v 1.4 2007/01/23 15:08:45 ph10 Exp $ */
   2
   3 /*************************************************
   4 *      Perl-Compatible Regular Expressions       *
   5 *************************************************/
   6
   7 /*PCRE is a library of functions to support regular expressions whose syntax
   8 and semantics are as close as possible to those of the Perl 5 language.
   9
  10                        Written by Philip Hazel
  11            Copyright (c) 1997-2006 University of Cambridge
  12
  13 -----------------------------------------------------------------------------
  14 Redistribution and use in source and binary forms, with or without
  15 modification, are permitted provided that the following conditions are met:
  16
  17     * Redistributions of source code must retain the above copyright notice,
  18       this list of conditions and the following disclaimer.
  19
  20     * Redistributions in binary form must reproduce the above copyright
  21       notice, this list of conditions and the following disclaimer in the
  22       documentation and/or other materials provided with the distribution.
  23
  24     * Neither the name of the University of Cambridge nor the names of its
  25       contributors may be used to endorse or promote products derived from
  26       this software without specific prior written permission.
  27
  28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  29 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  32 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  35 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  36 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 POSSIBILITY OF SUCH DAMAGE.
  39 -----------------------------------------------------------------------------
  40 */
  41
  42
  43 /* This module contains the external function pcre_fullinfo(), which returns
  44 information about a compiled pattern. */
  45
  46
  47 #include "pcre_internal.h"
  48
  49
  50 /*************************************************
  51 *        Return info about compiled pattern      *
  52 *************************************************/
  53
  54 /* This is a newer "info" function which has an extensible interface so
  55 that additional items can be added compatibly.
  56
  57 Arguments:
  58   argument_re      points to compiled code
  59   extra_data       points extra data, or NULL
  60   what             what information is required
  61   where            where to put the information
  62
  63 Returns:           0 if data returned, negative on error
  64 */
  65
  66 PCRE_DATA_SCOPE int
  67 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data, int what,
  68   void *where)
  69 {
  70 real_pcre internal_re;
  71 pcre_study_data internal_study;
  72 const real_pcre *re = (const real_pcre *)argument_re;
  73 const pcre_study_data *study = NULL;
  74
  75 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
  76
  77 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
  78   study = (const pcre_study_data *)extra_data->study_data;
  79
  80 if (re->magic_number != MAGIC_NUMBER)
  81   {
  82   re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
  83   if (re == NULL) return PCRE_ERROR_BADMAGIC;
  84   if (study != NULL) study = &internal_study;
  85   }
  86
  87 switch (what)
  88   {
  89   case PCRE_INFO_OPTIONS:
  90   *((unsigned long int *)where) = re->options & PUBLIC_OPTIONS;
  91   break;
  92
  93   case PCRE_INFO_SIZE:
  94   *((size_t *)where) = re->size;
  95   break;
  96
  97   case PCRE_INFO_STUDYSIZE:
  98   *((size_t *)where) = (study == NULL)? 0 : study->size;
  99   break;
 100
 101   case PCRE_INFO_CAPTURECOUNT:
 102   *((int *)where) = re->top_bracket;
 103   break;
 104
 105   case PCRE_INFO_BACKREFMAX:
 106   *((int *)where) = re->top_backref;
 107   break;
 108
 109   case PCRE_INFO_FIRSTBYTE:
 110   *((int *)where) =
 111     ((re->options & PCRE_FIRSTSET) != 0)? re->first_byte :
 112     ((re->options & PCRE_STARTLINE) != 0)? -1 : -2;
 113   break;
 114
 115   /* Make sure we pass back the pointer to the bit vector in the external
 116   block, not the internal copy (with flipped integer fields). */
 117
 118   case PCRE_INFO_FIRSTTABLE:
 119   *((const uschar **)where) =
 120     (study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0)?
 121       ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
 122   break;
 123
 124   case PCRE_INFO_LASTLITERAL:
 125   *((int *)where) =
 126     ((re->options & PCRE_REQCHSET) != 0)? re->req_byte : -1;
 127   break;
 128
 129   case PCRE_INFO_NAMEENTRYSIZE:
 130   *((int *)where) = re->name_entry_size;
 131   break;
 132
 133   case PCRE_INFO_NAMECOUNT:
 134   *((int *)where) = re->name_count;
 135   break;
 136
 137   case PCRE_INFO_NAMETABLE:
 138   *((const uschar **)where) = (const uschar *)re + re->name_table_offset;
 139   break;
 140
 141   case PCRE_INFO_DEFAULT_TABLES:
 142   *((const uschar **)where) = (const uschar *)(_pcre_default_tables);
 143   break;
 144
 145   default: return PCRE_ERROR_BADOPTION;
 146   }
 147
 148 return 0;
 149 }
 150
 151 /* End of pcre_fullinfo.c */