src/src/pcre/pcre_fullinfo.c

   1 /* $Cambridge: exim/src/src/pcre/pcre_fullinfo.c,v 1.6 2007/11/12 13:02:19 nm4 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) 1997-2007 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 #ifdef HAVE_CONFIG_H
  48 #include "config.h"
  49 #endif
  50
  51 #include "pcre_internal.h"
  52
  53
  54 /*************************************************
  55 *        Return info about compiled pattern      *
  56 *************************************************/
  57
  58 /* This is a newer "info" function which has an extensible interface so
  59 that additional items can be added compatibly.
  60
  61 Arguments:
  62   argument_re      points to compiled code
  63   extra_data       points extra data, or NULL
  64   what             what information is required
  65   where            where to put the information
  66
  67 Returns:           0 if data returned, negative on error
  68 */
  69
  70 PCRE_EXP_DEFN int
  71 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data, int what,
  72   void *where)
  73 {
  74 real_pcre internal_re;
  75 pcre_study_data internal_study;
  76 const real_pcre *re = (const real_pcre *)argument_re;
  77 const pcre_study_data *study = NULL;
  78
  79 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
  80
  81 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
  82   study = (const pcre_study_data *)extra_data->study_data;
  83
  84 if (re->magic_number != MAGIC_NUMBER)
  85   {
  86   re = _pcre_try_flipped(re, &internal_re, study, &internal_study);
  87   if (re == NULL) return PCRE_ERROR_BADMAGIC;
  88   if (study != NULL) study = &internal_study;
  89   }
  90
  91 switch (what)
  92   {
  93   case PCRE_INFO_OPTIONS:
  94   *((unsigned long int *)where) = re->options & PUBLIC_OPTIONS;
  95   break;
  96
  97   case PCRE_INFO_SIZE:
  98   *((size_t *)where) = re->size;
  99   break;
 100
 101   case PCRE_INFO_STUDYSIZE:
 102   *((size_t *)where) = (study == NULL)? 0 : study->size;
 103   break;
 104
 105   case PCRE_INFO_CAPTURECOUNT:
 106   *((int *)where) = re->top_bracket;
 107   break;
 108
 109   case PCRE_INFO_BACKREFMAX:
 110   *((int *)where) = re->top_backref;
 111   break;
 112
 113   case PCRE_INFO_FIRSTBYTE:
 114   *((int *)where) =
 115     ((re->flags & PCRE_FIRSTSET) != 0)? re->first_byte :
 116     ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
 117   break;
 118
 119   /* Make sure we pass back the pointer to the bit vector in the external
 120   block, not the internal copy (with flipped integer fields). */
 121
 122   case PCRE_INFO_FIRSTTABLE:
 123   *((const uschar **)where) =
 124     (study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0)?
 125       ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
 126   break;
 127
 128   case PCRE_INFO_LASTLITERAL:
 129   *((int *)where) =
 130     ((re->flags & PCRE_REQCHSET) != 0)? re->req_byte : -1;
 131   break;
 132
 133   case PCRE_INFO_NAMEENTRYSIZE:
 134   *((int *)where) = re->name_entry_size;
 135   break;
 136
 137   case PCRE_INFO_NAMECOUNT:
 138   *((int *)where) = re->name_count;
 139   break;
 140
 141   case PCRE_INFO_NAMETABLE:
 142   *((const uschar **)where) = (const uschar *)re + re->name_table_offset;
 143   break;
 144
 145   case PCRE_INFO_DEFAULT_TABLES:
 146   *((const uschar **)where) = (const uschar *)(_pcre_default_tables);
 147   break;
 148
 149   case PCRE_INFO_OKPARTIAL:
 150   *((int *)where) = (re->flags & PCRE_NOPARTIAL) == 0;
 151   break;
 152
 153   case PCRE_INFO_JCHANGED:
 154   *((int *)where) = (re->flags & PCRE_JCHANGED) != 0;
 155   break;
 156
 157   case PCRE_INFO_HASCRORLF:
 158   *((int *)where) = (re->flags & PCRE_HASCRORLF) != 0;
 159   break;
 160
 161   default: return PCRE_ERROR_BADOPTION;
 162   }
 163
 164 return 0;
 165 }
 166
 167 /* End of pcre_fullinfo.c */