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    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) 1997-2013 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   case PCRE_INFO_MATCHLIMIT:
  226   if ((re->flags & PCRE_MLSET) == 0) return PCRE_ERROR_UNSET;
  227   *((pcre_uint32 *)where) = re->limit_match;
  228   break;
  229 
  230   case PCRE_INFO_RECURSIONLIMIT:
  231   if ((re->flags & PCRE_RLSET) == 0) return PCRE_ERROR_UNSET;
  232   *((pcre_uint32 *)where) = re->limit_recursion;
  233   break;
  234 
  235   case PCRE_INFO_MATCH_EMPTY:
  236   *((int *)where) = (re->flags & PCRE_MATCH_EMPTY) != 0;
  237   break;
  238 
  239   default: return PCRE_ERROR_BADOPTION;
  240   }
  241 
  242 return 0;
  243 }
  244 
  245 /* End of pcre_fullinfo.c */