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