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

*      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) 2016-2024 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.

-----------------------------------------------------------------------------

*/

/* This module contains the external function pcre2_maketables(), which builds

character tables for PCRE2 in the current locale. The file is compiled on its

own as part of the PCRE2 library. It is also included in the compilation of

pcre2_dftables.c as a freestanding program, in which case the macro

PCRE2_DFTABLES is defined. */

#ifndef PCRE2_DFTABLES    /* Compiling the library */

#  ifdef HAVE_CONFIG_H

#  include "config.h"

#  endif

#  include "pcre2_internal.h"

#endif

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

*           Create PCRE2 character tables        *

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

/* This function builds a set of character tables for use by PCRE2 and returns

a pointer to them. They are build using the ctype functions, and consequently

their contents will depend upon the current locale setting. When compiled as

part of the library, the store is obtained via a general context malloc, if

supplied, but when PCRE2_DFTABLES is defined (when compiling the pcre2_dftables

freestanding auxiliary program) malloc() is used, and the function has a

different name so as not to clash with the prototype in pcre2.h.

Arguments:   none when PCRE2_DFTABLES is defined

               else a PCRE2 general context or NULL

Returns:     pointer to the contiguous block of data

               else NULL if memory allocation failed

*/

#ifdef PCRE2_DFTABLES  /* Included in freestanding pcre2_dftables program */

static const uint8_t *maketables(void)

{

uint8_t *yield = (uint8_t *)malloc(TABLES_LENGTH);

#else  /* Not PCRE2_DFTABLES, that is, compiling the library */

PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION

pcre2_maketables(pcre2_general_context *gcontext)

{

uint8_t *yield = (uint8_t *)((gcontext != NULL)?

  gcontext->memctl.malloc(TABLES_LENGTH, gcontext->memctl.memory_data) :

  malloc(TABLES_LENGTH));

#endif  /* PCRE2_DFTABLES */

int i;

uint8_t *p;

if (yield == NULL) return NULL;

p = yield;

/* First comes the lower casing table */

for (i = 0; i < 256; i++) *p++ = tolower(i);

/* Next the case-flipping table */

for (i = 0; i < 256; i++)

  {

  int c = islower(i)? toupper(i) : tolower(i);

  *p++ = (c < 256)? c : i;

  }

/* Then the character class tables. Don't try to be clever and save effort on

exclusive ones - in some locales things may be different.

Note that the table for "space" includes everything "isspace" gives, including

VT in the default locale. This makes it work for the POSIX class [:space:].

From PCRE1 release 8.34 and for all PCRE2 releases it is also correct for Perl

space, because Perl added VT at release 5.18.

Note also that it is possible for a character to be alnum or alpha without

being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the

fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must

test for alnum specially. */

memset(p, 0, cbit_length);

for (i = 0; i < 256; i++)

  {

  if (isdigit(i))  p[cbit_digit  + i/8] |= 1u << (i&7);

  if (isupper(i))  p[cbit_upper  + i/8] |= 1u << (i&7);

  if (islower(i))  p[cbit_lower  + i/8] |= 1u << (i&7);

  if (isalnum(i))  p[cbit_word   + i/8] |= 1u << (i&7);

  if (i == '_')    p[cbit_word   + i/8] |= 1u << (i&7);

  if (isspace(i))  p[cbit_space  + i/8] |= 1u << (i&7);

  if (isxdigit(i)) p[cbit_xdigit + i/8] |= 1u << (i&7);

  if (isgraph(i))  p[cbit_graph  + i/8] |= 1u << (i&7);

  if (isprint(i))  p[cbit_print  + i/8] |= 1u << (i&7);

  if (ispunct(i))  p[cbit_punct  + i/8] |= 1u << (i&7);

  if (iscntrl(i))  p[cbit_cntrl  + i/8] |= 1u << (i&7);

  }

p += cbit_length;

/* Finally, the character type table. In this, we used to exclude VT from the

white space chars, because Perl didn't recognize it as such for \s and for

comments within regexes. However, Perl changed at release 5.18, so PCRE1

changed at release 8.34 and it's always been this way for PCRE2. */

for (i = 0; i < 256; i++)

  {

  int x = 0;

  if (isspace(i)) x += ctype_space;

  if (isalpha(i)) x += ctype_letter;

  if (islower(i)) x += ctype_lcletter;

  if (isdigit(i)) x += ctype_digit;

  if (isalnum(i) || i == '_') x += ctype_word;

  *p++ = x;

  }

return yield;

}

#ifndef PCRE2_DFTABLES   /* Compiling the library */

PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION

pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables)

{

if (gcontext != NULL)

  gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data);

else

  free((void *)tables);

}

#endif

/* End of pcre2_maketables.c */