xref: /aosp_15_r20/external/pcre/src/pcre2_match_data.c (revision 22dc650d8ae982c6770746019a6f94af92b0f024)

/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
     Original API code Copyright (c) 1997-2012 University of Cambridge
          New API code Copyright (c) 2016-2022 University of Cambridge

-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "pcre2_internal.h"



/*************************************************
*  Create a match data block given ovector size  *
*************************************************/

/* A minimum of 1 is imposed on the number of ovector pairs. A maximum is also
imposed because the oveccount field in a match data block is uintt6_t. */

PCRE2_EXP_DEFN pcre2_match_data * PCRE2_CALL_CONVENTION
pcre2_match_data_create(uint32_t oveccount, pcre2_general_context *gcontext)
{
pcre2_match_data *yield;
if (oveccount < 1) oveccount = 1;
if (oveccount > UINT16_MAX) oveccount = UINT16_MAX;
yield = PRIV(memctl_malloc)(
  offsetof(pcre2_match_data, ovector) + 2*oveccount*sizeof(PCRE2_SIZE),
  (pcre2_memctl *)gcontext);
if (yield == NULL) return NULL;
yield->oveccount = oveccount;
yield->flags = 0;
yield->heapframes = NULL;
yield->heapframes_size = 0;
return yield;
}



/*************************************************
*  Create a match data block using pattern data  *
*************************************************/

/* If no context is supplied, use the memory allocator from the code. */

PCRE2_EXP_DEFN pcre2_match_data * PCRE2_CALL_CONVENTION
pcre2_match_data_create_from_pattern(const pcre2_code *code,
  pcre2_general_context *gcontext)
{
if (gcontext == NULL) gcontext = (pcre2_general_context *)code;
return pcre2_match_data_create(((pcre2_real_code *)code)->top_bracket + 1,
  gcontext);
}



/*************************************************
*            Free a match data block             *
*************************************************/

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
pcre2_match_data_free(pcre2_match_data *match_data)
{
if (match_data != NULL)
  {
  if (match_data->heapframes != NULL)
    match_data->memctl.free(match_data->heapframes,
      match_data->memctl.memory_data);
  if ((match_data->flags & PCRE2_MD_COPIED_SUBJECT) != 0)
    match_data->memctl.free((void *)match_data->subject,
      match_data->memctl.memory_data);
  match_data->memctl.free(match_data, match_data->memctl.memory_data);
  }
}



/*************************************************
*         Get last mark in match                 *
*************************************************/

PCRE2_EXP_DEFN PCRE2_SPTR PCRE2_CALL_CONVENTION
pcre2_get_mark(pcre2_match_data *match_data)
{
return match_data->mark;
}



/*************************************************
*          Get pointer to ovector                *
*************************************************/

PCRE2_EXP_DEFN PCRE2_SIZE * PCRE2_CALL_CONVENTION
pcre2_get_ovector_pointer(pcre2_match_data *match_data)
{
return match_data->ovector;
}



/*************************************************
*          Get number of ovector slots           *
*************************************************/

PCRE2_EXP_DEFN uint32_t PCRE2_CALL_CONVENTION
pcre2_get_ovector_count(pcre2_match_data *match_data)
{
return match_data->oveccount;
}



/*************************************************
*         Get starting code unit in match        *
*************************************************/

PCRE2_EXP_DEFN PCRE2_SIZE PCRE2_CALL_CONVENTION
pcre2_get_startchar(pcre2_match_data *match_data)
{
return match_data->startchar;
}



/*************************************************
*         Get size of match data block           *
*************************************************/

PCRE2_EXP_DEFN PCRE2_SIZE PCRE2_CALL_CONVENTION
pcre2_get_match_data_size(pcre2_match_data *match_data)
{
return offsetof(pcre2_match_data, ovector) +
  2 * (match_data->oveccount) * sizeof(PCRE2_SIZE);
}



/*************************************************
*             Get heapframes size                *
*************************************************/

PCRE2_EXP_DEFN PCRE2_SIZE PCRE2_CALL_CONVENTION
pcre2_get_match_data_heapframes_size(pcre2_match_data *match_data)
{
return match_data->heapframes_size;
}

/* End of pcre2_match_data.c */