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

*      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

           Copyright (c) 1997-2008 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 pcre_maketables(), which builds

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

own as part of the PCRE library. However, it is also included in the

compilation of dftables.c, in which case the macro DFTABLES is defined. */

#ifndef DFTABLES

#  ifdef HAVE_CONFIG_H

#  include "config.h"

#  endif

#  include "pcre_internal.h"

#endif

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

*           Create PCRE character tables         *

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

/* This function builds a set of character tables for use by PCRE 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 pcre_malloc(), but when compiled

inside dftables, use malloc().

Arguments:   none

Returns:     pointer to the contiguous block of data

*/

const unsigned char *

pcre_maketables(void)

{

unsigned char *yield, *p;

int i;

#ifndef DFTABLES

yield = (unsigned char*)(pcre_malloc)(tables_length);

#else

yield = (unsigned char*)malloc(tables_length);

#endif

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++) *p++ = islower(i)? toupper(i) : tolower(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:]. 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] |= 1 << (i&7);

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

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

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

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

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

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

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

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

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

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

  }

p += cbit_length;

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

space chars, because Perl doesn't recognize it as such for \s and for comments

within regexes. */

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

  {

  int x = 0;

  if (i != 0x0b && isspace(i)) x += ctype_space;

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

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

  if (isxdigit(i)) x += ctype_xdigit;

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

  /* Note: strchr includes the terminating zero in the characters it considers.

  In this instance, that is ok because we want binary zero to be flagged as a

  meta-character, which in this sense is any character that terminates a run

  of data characters. */

  if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;

  *p++ = x;

  }

return yield;

}

/* End of pcre_maketables.c */