release/src/router/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 #if defined 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 #elif defined COMPILE_PCRE16
  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 #elif defined COMPILE_PCRE32
  77 PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
  78 pcre32_fullinfo(const pcre32 *argument_re, const pcre32_extra *extra_data,
  79   int what, void *where)
  80 #endif
  81 {
  82 const REAL_PCRE *re = (const REAL_PCRE *)argument_re;
  83 const pcre_study_data *study = NULL;
  84
  85 if (re == NULL || where == NULL) return PCRE_ERROR_NULL;
  86
  87 if (extra_data != NULL && (extra_data->flags & PCRE_EXTRA_STUDY_DATA) != 0)
  88   study = (const pcre_study_data *)extra_data->study_data;
  89
  90 /* Check that the first field in the block is the magic number. If it is not,
  91 return with PCRE_ERROR_BADMAGIC. However, if the magic number is equal to
  92 REVERSED_MAGIC_NUMBER we return with PCRE_ERROR_BADENDIANNESS, which
  93 means that the pattern is likely compiled with different endianness. */
  94
  95 if (re->magic_number != MAGIC_NUMBER)
  96   return re->magic_number == REVERSED_MAGIC_NUMBER?
  97     PCRE_ERROR_BADENDIANNESS:PCRE_ERROR_BADMAGIC;
  98
  99 /* Check that this pattern was compiled in the correct bit mode */
 100
 101 if ((re->flags & PCRE_MODE) == 0) return PCRE_ERROR_BADMODE;
 102
 103 switch (what)
 104   {
 105   case PCRE_INFO_OPTIONS:
 106   *((unsigned long int *)where) = re->options & PUBLIC_COMPILE_OPTIONS;
 107   break;
 108
 109   case PCRE_INFO_SIZE:
 110   *((size_t *)where) = re->size;
 111   break;
 112
 113   case PCRE_INFO_STUDYSIZE:
 114   *((size_t *)where) = (study == NULL)? 0 : study->size;
 115   break;
 116
 117   case PCRE_INFO_JITSIZE:
 118 #ifdef SUPPORT_JIT
 119   *((size_t *)where) =
 120       (extra_data != NULL &&
 121       (extra_data->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
 122       extra_data->executable_jit != NULL)?
 123     PRIV(jit_get_size)(extra_data->executable_jit) : 0;
 124 #else
 125   *((size_t *)where) = 0;
 126 #endif
 127   break;
 128
 129   case PCRE_INFO_CAPTURECOUNT:
 130   *((int *)where) = re->top_bracket;
 131   break;
 132
 133   case PCRE_INFO_BACKREFMAX:
 134   *((int *)where) = re->top_backref;
 135   break;
 136
 137   case PCRE_INFO_FIRSTBYTE:
 138   *((int *)where) =
 139     ((re->flags & PCRE_FIRSTSET) != 0)? (int)re->first_char :
 140     ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
 141   break;
 142
 143   case PCRE_INFO_FIRSTCHARACTER:
 144     *((pcre_uint32 *)where) =
 145       (re->flags & PCRE_FIRSTSET) != 0 ? re->first_char : 0;
 146     break;
 147
 148   case PCRE_INFO_FIRSTCHARACTERFLAGS:
 149     *((int *)where) =
 150       ((re->flags & PCRE_FIRSTSET) != 0) ? 1 :
 151       ((re->flags & PCRE_STARTLINE) != 0) ? 2 : 0;
 152     break;
 153
 154   /* Make sure we pass back the pointer to the bit vector in the external
 155   block, not the internal copy (with flipped integer fields). */
 156
 157   case PCRE_INFO_FIRSTTABLE:
 158   *((const pcre_uint8 **)where) =
 159     (study != NULL && (study->flags & PCRE_STUDY_MAPPED) != 0)?
 160       ((const pcre_study_data *)extra_data->study_data)->start_bits : NULL;
 161   break;
 162
 163   case PCRE_INFO_MINLENGTH:
 164   *((int *)where) =
 165     (study != NULL && (study->flags & PCRE_STUDY_MINLEN) != 0)?
 166       (int)(study->minlength) : -1;
 167   break;
 168
 169   case PCRE_INFO_JIT:
 170   *((int *)where) = extra_data != NULL &&
 171                     (extra_data->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
 172                     extra_data->executable_jit != NULL;
 173   break;
 174
 175   case PCRE_INFO_LASTLITERAL:
 176   *((int *)where) =
 177     ((re->flags & PCRE_REQCHSET) != 0)? (int)re->req_char : -1;
 178   break;
 179
 180   case PCRE_INFO_REQUIREDCHAR:
 181     *((pcre_uint32 *)where) =
 182       ((re->flags & PCRE_REQCHSET) != 0) ? re->req_char : 0;
 183     break;
 184
 185   case PCRE_INFO_REQUIREDCHARFLAGS:
 186     *((int *)where) =
 187       ((re->flags & PCRE_REQCHSET) != 0);
 188     break;
 189
 190   case PCRE_INFO_NAMEENTRYSIZE:
 191   *((int *)where) = re->name_entry_size;
 192   break;
 193
 194   case PCRE_INFO_NAMECOUNT:
 195   *((int *)where) = re->name_count;
 196   break;
 197
 198   case PCRE_INFO_NAMETABLE:
 199   *((const pcre_uchar **)where) = (const pcre_uchar *)re + re->name_table_offset;
 200   break;
 201
 202   case PCRE_INFO_DEFAULT_TABLES:
 203   *((const pcre_uint8 **)where) = (const pcre_uint8 *)(PRIV(default_tables));
 204   break;
 205
 206   /* From release 8.00 this will always return TRUE because NOPARTIAL is
 207   no longer ever set (the restrictions have been removed). */
 208
 209   case PCRE_INFO_OKPARTIAL:
 210   *((int *)where) = (re->flags & PCRE_NOPARTIAL) == 0;
 211   break;
 212
 213   case PCRE_INFO_JCHANGED:
 214   *((int *)where) = (re->flags & PCRE_JCHANGED) != 0;
 215   break;
 216
 217   case PCRE_INFO_HASCRORLF:
 218   *((int *)where) = (re->flags & PCRE_HASCRORLF) != 0;
 219   break;
 220
 221   case PCRE_INFO_MAXLOOKBEHIND:
 222   *((int *)where) = re->max_lookbehind;
 223   break;
 224
 225   default: return PCRE_ERROR_BADOPTION;
 226   }
 227
 228 return 0;
 229 }
 230
 231 /* End of pcre_fullinfo.c */