162 lines
6.1 KiB
C
162 lines
6.1 KiB
C
/*************************************************
|
|
* 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) 2016-2019 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. 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 "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 DFTABLES is defined (when compiling the dftables 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 DFTABLES is defined
|
|
else a PCRE2 general context or NULL
|
|
Returns: pointer to the contiguous block of data
|
|
*/
|
|
|
|
#ifdef DFTABLES /* Included in freestanding dftables.c program */
|
|
static const uint8_t *maketables(void)
|
|
{
|
|
uint8_t *yield = (uint8_t *)malloc(tables_length);
|
|
|
|
#else /* Not DFTABLES, 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 /* 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++) *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:].
|
|
From release 8.34 is 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 PCRE changed
|
|
at release 8.34. */
|
|
|
|
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 DFTABLES
|
|
PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
|
|
pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables)
|
|
{
|
|
if (gcontext)
|
|
gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data);
|
|
else
|
|
free((void *)tables);
|
|
}
|
|
#endif
|
|
|
|
/* End of pcre2_maketables.c */
|