/*************************************************

*      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) 2016-2017 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"

/*************************************************

*          Default malloc/free functions         *

*************************************************/

/* Ignore the "user data" argument in each case. */

static void *default_malloc(size_t size, void *data)

{

(void)data;

return malloc(size);

}

static void default_free(void *block, void *data)

{

(void)data;

free(block);

}

/*************************************************

*        Get a block and save memory control     *

*************************************************/

/* This internal function is called to get a block of memory in which the

memory control data is to be stored at the start for future use.

Arguments:

  size        amount of memory required

  memctl      pointer to a memctl block or NULL

Returns:      pointer to memory or NULL on failure

*/

extern void *

PRIV(memctl_malloc)(size_t size, pcre2_memctl *memctl)

{

pcre2_memctl *newmemctl;

void *yield = (memctl == NULL)? malloc(size) :

  memctl->malloc(size, memctl->memory_data);

if (yield == NULL) return NULL;

newmemctl = (pcre2_memctl *)yield;

if (memctl == NULL)

  {

  newmemctl->malloc = default_malloc;

  newmemctl->free = default_free;

  newmemctl->memory_data = NULL;

  }

else *newmemctl = *memctl;

return yield;

}

/*************************************************

*          Create and initialize contexts        *

*************************************************/

/* Initializing for compile and match contexts is done in separate, private

functions so that these can be called from functions such as pcre2_compile()

when an external context is not supplied. The initializing functions have an

option to set up default memory management. */

PCRE2_EXP_DEFN pcre2_general_context * PCRE2_CALL_CONVENTION

pcre2_general_context_create(void *(*private_malloc)(size_t, void *),

  void (*private_free)(void *, void *), void *memory_data)

{

pcre2_general_context *gcontext;

if (private_malloc == NULL) private_malloc = default_malloc;

if (private_free == NULL) private_free = default_free;

gcontext = private_malloc(sizeof(pcre2_real_general_context), memory_data);

if (gcontext == NULL) return NULL;

gcontext->memctl.malloc = private_malloc;

gcontext->memctl.free = private_free;

gcontext->memctl.memory_data = memory_data;

return gcontext;

}

/* A default compile context is set up to save having to initialize at run time

when no context is supplied to the compile function. */

const pcre2_compile_context PRIV(default_compile_context) = {

  { default_malloc, default_free, NULL },    /* Default memory handling */

  NULL,                                      /* Stack guard */

  NULL,                                      /* Stack guard data */

  PRIV(default_tables),                      /* Character tables */

  PCRE2_UNSET,                               /* Max pattern length */

  BSR_DEFAULT,                               /* Backslash R default */

  NEWLINE_DEFAULT,                           /* Newline convention */

  PARENS_NEST_LIMIT,                         /* As it says */

  0 };                                       /* Extra options */

/* The create function copies the default into the new memory, but must

override the default memory handling functions if a gcontext was provided. */

PCRE2_EXP_DEFN pcre2_compile_context * PCRE2_CALL_CONVENTION

pcre2_compile_context_create(pcre2_general_context *gcontext)

{

pcre2_compile_context *ccontext = PRIV(memctl_malloc)(

  sizeof(pcre2_real_compile_context), (pcre2_memctl *)gcontext);

if (ccontext == NULL) return NULL;

*ccontext = PRIV(default_compile_context);

if (gcontext != NULL)

  *((pcre2_memctl *)ccontext) = *((pcre2_memctl *)gcontext);

return ccontext;

}

/* A default match context is set up to save having to initialize at run time

when no context is supplied to a match function. */

const pcre2_match_context PRIV(default_match_context) = {

  { default_malloc, default_free, NULL },

#ifdef SUPPORT_JIT

  NULL,

  NULL,

#endif

  NULL,

  NULL,

  PCRE2_UNSET,   /* Offset limit */

  HEAP_LIMIT,

  MATCH_LIMIT,

  MATCH_LIMIT_DEPTH };

/* The create function copies the default into the new memory, but must

override the default memory handling functions if a gcontext was provided. */

PCRE2_EXP_DEFN pcre2_match_context * PCRE2_CALL_CONVENTION

pcre2_match_context_create(pcre2_general_context *gcontext)

{

pcre2_match_context *mcontext = PRIV(memctl_malloc)(

  sizeof(pcre2_real_match_context), (pcre2_memctl *)gcontext);

if (mcontext == NULL) return NULL;

*mcontext = PRIV(default_match_context);

if (gcontext != NULL)

  *((pcre2_memctl *)mcontext) = *((pcre2_memctl *)gcontext);

return mcontext;

}

/* A default convert context is set up to save having to initialize at run time

when no context is supplied to the convert function. */

const pcre2_convert_context PRIV(default_convert_context) = {

  { default_malloc, default_free, NULL },    /* Default memory handling */

#ifdef _WIN32

  CHAR_BACKSLASH,                            /* Default path separator */

  CHAR_GRAVE_ACCENT                          /* Default escape character */

#else  /* Not Windows */

  CHAR_SLASH,                                /* Default path separator */

  CHAR_BACKSLASH                             /* Default escape character */

#endif

  };

/* The create function copies the default into the new memory, but must

override the default memory handling functions if a gcontext was provided. */

PCRE2_EXP_DEFN pcre2_convert_context * PCRE2_CALL_CONVENTION

pcre2_convert_context_create(pcre2_general_context *gcontext)

{

pcre2_convert_context *ccontext = PRIV(memctl_malloc)(

  sizeof(pcre2_real_convert_context), (pcre2_memctl *)gcontext);

if (ccontext == NULL) return NULL;

*ccontext = PRIV(default_convert_context);

if (gcontext != NULL)

  *((pcre2_memctl *)ccontext) = *((pcre2_memctl *)gcontext);

return ccontext;

}

/*************************************************

*              Context copy functions            *

*************************************************/

PCRE2_EXP_DEFN pcre2_general_context * PCRE2_CALL_CONVENTION

pcre2_general_context_copy(pcre2_general_context *gcontext)

{

pcre2_general_context *new =

  gcontext->memctl.malloc(sizeof(pcre2_real_general_context),

  gcontext->memctl.memory_data);

if (new == NULL) return NULL;

memcpy(new, gcontext, sizeof(pcre2_real_general_context));

return new;

}

PCRE2_EXP_DEFN pcre2_compile_context * PCRE2_CALL_CONVENTION

pcre2_compile_context_copy(pcre2_compile_context *ccontext)

{

pcre2_compile_context *new =

  ccontext->memctl.malloc(sizeof(pcre2_real_compile_context),

  ccontext->memctl.memory_data);

if (new == NULL) return NULL;

memcpy(new, ccontext, sizeof(pcre2_real_compile_context));

return new;

}

PCRE2_EXP_DEFN pcre2_match_context * PCRE2_CALL_CONVENTION

pcre2_match_context_copy(pcre2_match_context *mcontext)

{

pcre2_match_context *new =

  mcontext->memctl.malloc(sizeof(pcre2_real_match_context),

  mcontext->memctl.memory_data);

if (new == NULL) return NULL;

memcpy(new, mcontext, sizeof(pcre2_real_match_context));

return new;

}

PCRE2_EXP_DEFN pcre2_convert_context * PCRE2_CALL_CONVENTION

pcre2_convert_context_copy(pcre2_convert_context *ccontext)

{

pcre2_convert_context *new =

  ccontext->memctl.malloc(sizeof(pcre2_real_convert_context),

  ccontext->memctl.memory_data);

if (new == NULL) return NULL;

memcpy(new, ccontext, sizeof(pcre2_real_convert_context));

return new;

}

/*************************************************

*              Context free functions            *

*************************************************/

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION

pcre2_general_context_free(pcre2_general_context *gcontext)

{

if (gcontext != NULL)

  gcontext->memctl.free(gcontext, gcontext->memctl.memory_data);

}

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION

pcre2_compile_context_free(pcre2_compile_context *ccontext)

{

if (ccontext != NULL)

  ccontext->memctl.free(ccontext, ccontext->memctl.memory_data);

}

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION

pcre2_match_context_free(pcre2_match_context *mcontext)

{

if (mcontext != NULL)

  mcontext->memctl.free(mcontext, mcontext->memctl.memory_data);

}

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION

pcre2_convert_context_free(pcre2_convert_context *ccontext)

{

if (ccontext != NULL)

  ccontext->memctl.free(ccontext, ccontext->memctl.memory_data);

}

/*************************************************

*             Set values in contexts             *

*************************************************/

/* All these functions return 0 for success or PCRE2_ERROR_BADDATA if invalid

data is given. Only some of the functions are able to test the validity of the

data. */

/* ------------ Compile context ------------ */

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_character_tables(pcre2_compile_context *ccontext,

  const unsigned char *tables)

{

ccontext->tables = tables;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_bsr(pcre2_compile_context *ccontext, uint32_t value)

{

switch(value)

  {

  case PCRE2_BSR_ANYCRLF:

  case PCRE2_BSR_UNICODE:

  ccontext->bsr_convention = value;

  return 0;

  default:

  return PCRE2_ERROR_BADDATA;

  }

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_max_pattern_length(pcre2_compile_context *ccontext, PCRE2_SIZE length)

{

ccontext->max_pattern_length = length;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_newline(pcre2_compile_context *ccontext, uint32_t newline)

{

switch(newline)

  {

  case PCRE2_NEWLINE_CR:

  case PCRE2_NEWLINE_LF:

  case PCRE2_NEWLINE_CRLF:

  case PCRE2_NEWLINE_ANY:

  case PCRE2_NEWLINE_ANYCRLF:

  case PCRE2_NEWLINE_NUL:

  ccontext->newline_convention = newline;

  return 0;

  default:

  return PCRE2_ERROR_BADDATA;

  }

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_parens_nest_limit(pcre2_compile_context *ccontext, uint32_t limit)

{

ccontext->parens_nest_limit = limit;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_compile_extra_options(pcre2_compile_context *ccontext, uint32_t options)

{

ccontext->extra_options = options;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_compile_recursion_guard(pcre2_compile_context *ccontext,

  int (*guard)(uint32_t, void *), void *user_data)

{

ccontext->stack_guard = guard;

ccontext->stack_guard_data = user_data;

return 0;

}

/* ------------ Match context ------------ */

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_callout(pcre2_match_context *mcontext,

  int (*callout)(pcre2_callout_block *, void *), void *callout_data)

{

mcontext->callout = callout;

mcontext->callout_data = callout_data;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_heap_limit(pcre2_match_context *mcontext, uint32_t limit)

{

mcontext->heap_limit = limit;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_match_limit(pcre2_match_context *mcontext, uint32_t limit)

{

mcontext->match_limit = limit;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_depth_limit(pcre2_match_context *mcontext, uint32_t limit)

{

mcontext->depth_limit = limit;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_offset_limit(pcre2_match_context *mcontext, PCRE2_SIZE limit)

{

mcontext->offset_limit = limit;

return 0;

}

/* This function became obsolete at release 10.30. It is kept as a synonym for

backwards compatibility. */

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_recursion_limit(pcre2_match_context *mcontext, uint32_t limit)

{

return pcre2_set_depth_limit(mcontext, limit);

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_recursion_memory_management(pcre2_match_context *mcontext,

  void *(*mymalloc)(size_t, void *), void (*myfree)(void *, void *),

  void *mydata)

{

(void)mcontext;

(void)mymalloc;

(void)myfree;

(void)mydata;

return 0;

}

/* ------------ Convert context ------------ */

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_glob_separator(pcre2_convert_context *ccontext, uint32_t separator)

{

if (separator != CHAR_SLASH && separator != CHAR_BACKSLASH &&

    separator != CHAR_DOT) return PCRE2_ERROR_BADDATA;

ccontext->glob_separator = separator;

return 0;

}

PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION

pcre2_set_glob_escape(pcre2_convert_context *ccontext, uint32_t escape)

{

if (escape > 255 || (escape != 0 && !ispunct(escape)))

  return PCRE2_ERROR_BADDATA;

ccontext->glob_escape = escape;

return 0;

}

/* End of pcre2_context.c */