glib/pcre/pcre_fullinfo.c

   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) 1997-2012 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 #ifdef COMPILE_PCRE8
  69 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
  70 pcre_fullinfo(const pcre *argument_re, const pcre_extra *extra_data,
  71   int what, void *where)
  72 #else
  73 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
  74 pcre16_fullinfo(const pcre16 *argument_re, const pcre16_extra *extra_data,
  75   int what, void *where)
  76 #endif
  77 {
  78 const REAL_PCRE *re = (const REAL_PCRE *)argument_re;
  79 const pcre_study_data *study = NULL;
  80
  81 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
  82
  83 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
  84   study = (const pcre_study_data *)extra_data->study_data;
  85
  86 /* Check that the first field in the block is the magic number. If it is not,
  87 return with PCRE_ERROR_BADMAGIC. However, if the magic number is equal to
  88 REVERSED_MAGIC_NUMBER we return with PCRE_ERROR_BADENDIANNESS, which
  89 means that the pattern is likely compiled with different endianness. */
  90
  91 if (re->magic_number != MAGIC_NUMBER)
  92   return re->magic_number == REVERSED_MAGIC_NUMBER?
  93     PCRE_ERROR_BADENDIANNESS:PCRE_ERROR_BADMAGIC;
  94
  95 /* Check that this pattern was compiled in the correct bit mode */
  96
  97 if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
  98
  99 switch (what)
 100   {
 101   case PCRE_INFO_OPTIONS:
 102   *((unsigned long int *)where) = re->options & PUBLIC_COMPILE_OPTIONS;
 103   break;
 104
 105   case PCRE_INFO_SIZE:
 106   *((size_t *)where) = re->size;
 107   break;
 108
 109   case PCRE_INFO_STUDYSIZE:
 110   *((size_t *)where) = (study == NULL)? 0 : study->size;
 111   break;
 112
 113   case PCRE_INFO_JITSIZE:
 114 #ifdef SUPPORT_JIT
 115   *((size_t *)where) =
 116       (extra_data != NULL &&
 117       (extra_data->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
 118       extra_data->executable_jit != NULL)?
 119     PRIV(jit_get_size)(extra_data->executable_jit) : 0;
 120 #else
 121   *((size_t *)where) = 0;
 122 #endif
 123   break;
 124
 125   case PCRE_INFO_CAPTURECOUNT:
 126   *((int *)where) = re->top_bracket;
 127   break;
 128
 129   case PCRE_INFO_BACKREFMAX:
 130   *((int *)where) = re->top_backref;
 131   break;
 132
 133   case PCRE_INFO_FIRSTBYTE:
 134   *((int *)where) =
 135     ((re->flags & PCRE_FIRSTSET) != 0)? re->first_char :
 136     ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
 137   break;
 138
 139   /* Make sure we pass back the pointer to the bit vector in the external
 140   block, not the internal copy (with flipped integer fields). */
 141
 142   case PCRE_INFO_FIRSTTABLE:
 143   *((const pcre_uint8 **)where) =
 144     (study != NULL && (study->flags & PCRE_STUDY_MAPPED) != 0)?
 145       ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
 146   break;
 147
 148   case PCRE_INFO_MINLENGTH:
 149   *((int *)where) =
 150     (study != NULL && (study->flags & PCRE_STUDY_MINLEN) != 0)?
 151       (int)(study->minlength) : -1;
 152   break;
 153
 154   case PCRE_INFO_JIT:
 155   *((int *)where) = extra_data != NULL &&
 156                     (extra_data->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
 157                     extra_data->executable_jit != NULL;
 158   break;
 159
 160   case PCRE_INFO_LASTLITERAL:
 161   *((int *)where) =
 162     ((re->flags & PCRE_REQCHSET) != 0)? re->req_char : -1;
 163   break;
 164
 165   case PCRE_INFO_NAMEENTRYSIZE:
 166   *((int *)where) = re->name_entry_size;
 167   break;
 168
 169   case PCRE_INFO_NAMECOUNT:
 170   *((int *)where) = re->name_count;
 171   break;
 172
 173   case PCRE_INFO_NAMETABLE:
 174   *((const pcre_uchar **)where) = (const pcre_uchar *)re + re->name_table_offset;
 175   break;
 176
 177   case PCRE_INFO_DEFAULT_TABLES:
 178   *((const pcre_uint8 **)where) = (const pcre_uint8 *)(PRIV(default_tables));
 179   break;
 180
 181   /* From release 8.00 this will always return TRUE because NOPARTIAL is
 182   no longer ever set (the restrictions have been removed). */
 183
 184   case PCRE_INFO_OKPARTIAL:
 185   *((int *)where) = (re->flags & PCRE_NOPARTIAL) == 0;
 186   break;
 187
 188   case PCRE_INFO_JCHANGED:
 189   *((int *)where) = (re->flags & PCRE_JCHANGED) != 0;
 190   break;
 191
 192   case PCRE_INFO_HASCRORLF:
 193   *((int *)where) = (re->flags & PCRE_HASCRORLF) != 0;
 194   break;
 195
 196   case PCRE_INFO_MAXLOOKBEHIND:
 197   *((int *)where) = re->max_lookbehind;
 198   break;
 199
 200   default: return PCRE_ERROR_BADOPTION;
 201   }
 202
 203 return 0;
 204 }
 205
 206 /* End of pcre_fullinfo.c */