164 lines
6.6 KiB
C
164 lines
6.6 KiB
C
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/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2016-2020 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains the external function pcre2_maketables(), which builds
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character tables for PCRE2 in the current locale. The file is compiled on its
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own as part of the PCRE2 library. It is also included in the compilation of
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pcre2_dftables.c as a freestanding program, in which case the macro
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PCRE2_DFTABLES is defined. */
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#ifndef PCRE2_DFTABLES /* Compiling the library */
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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# include "pcre2_internal.h"
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#endif
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/*************************************************
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* Create PCRE2 character tables *
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*************************************************/
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/* This function builds a set of character tables for use by PCRE2 and returns
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a pointer to them. They are build using the ctype functions, and consequently
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their contents will depend upon the current locale setting. When compiled as
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part of the library, the store is obtained via a general context malloc, if
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supplied, but when PCRE2_DFTABLES is defined (when compiling the pcre2_dftables
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freestanding auxiliary program) malloc() is used, and the function has a
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different name so as not to clash with the prototype in pcre2.h.
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Arguments: none when PCRE2_DFTABLES is defined
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else a PCRE2 general context or NULL
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Returns: pointer to the contiguous block of data
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else NULL if memory allocation failed
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*/
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#ifdef PCRE2_DFTABLES /* Included in freestanding pcre2_dftables program */
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static const uint8_t *maketables(void)
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{
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uint8_t *yield = (uint8_t *)malloc(TABLES_LENGTH);
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#else /* Not PCRE2_DFTABLES, that is, compiling the library */
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PCRE2_EXP_DEFN const uint8_t * PCRE2_CALL_CONVENTION
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pcre2_maketables(pcre2_general_context *gcontext)
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{
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uint8_t *yield = (uint8_t *)((gcontext != NULL)?
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gcontext->memctl.malloc(TABLES_LENGTH, gcontext->memctl.memory_data) :
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malloc(TABLES_LENGTH));
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#endif /* PCRE2_DFTABLES */
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int i;
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uint8_t *p;
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if (yield == NULL) return NULL;
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p = yield;
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/* First comes the lower casing table */
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for (i = 0; i < 256; i++) *p++ = tolower(i);
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/* Next the case-flipping table */
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for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
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/* Then the character class tables. Don't try to be clever and save effort on
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exclusive ones - in some locales things may be different.
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Note that the table for "space" includes everything "isspace" gives, including
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VT in the default locale. This makes it work for the POSIX class [:space:].
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From PCRE1 release 8.34 and for all PCRE2 releases it is also correct for Perl
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space, because Perl added VT at release 5.18.
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Note also that it is possible for a character to be alnum or alpha without
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being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
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fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
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test for alnum specially. */
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memset(p, 0, cbit_length);
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for (i = 0; i < 256; i++)
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{
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if (isdigit(i)) p[cbit_digit + i/8] |= 1u << (i&7);
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if (isupper(i)) p[cbit_upper + i/8] |= 1u << (i&7);
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if (islower(i)) p[cbit_lower + i/8] |= 1u << (i&7);
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if (isalnum(i)) p[cbit_word + i/8] |= 1u << (i&7);
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if (i == '_') p[cbit_word + i/8] |= 1u << (i&7);
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if (isspace(i)) p[cbit_space + i/8] |= 1u << (i&7);
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if (isxdigit(i)) p[cbit_xdigit + i/8] |= 1u << (i&7);
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if (isgraph(i)) p[cbit_graph + i/8] |= 1u << (i&7);
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if (isprint(i)) p[cbit_print + i/8] |= 1u << (i&7);
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if (ispunct(i)) p[cbit_punct + i/8] |= 1u << (i&7);
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if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1u << (i&7);
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}
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p += cbit_length;
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/* Finally, the character type table. In this, we used to exclude VT from the
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white space chars, because Perl didn't recognize it as such for \s and for
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comments within regexes. However, Perl changed at release 5.18, so PCRE1
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changed at release 8.34 and it's always been this way for PCRE2. */
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for (i = 0; i < 256; i++)
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{
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int x = 0;
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if (isspace(i)) x += ctype_space;
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if (isalpha(i)) x += ctype_letter;
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if (islower(i)) x += ctype_lcletter;
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if (isdigit(i)) x += ctype_digit;
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if (isalnum(i) || i == '_') x += ctype_word;
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*p++ = x;
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}
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return yield;
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}
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#ifndef PCRE2_DFTABLES /* Compiling the library */
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PCRE2_EXP_DEFN void PCRE2_CALL_CONVENTION
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pcre2_maketables_free(pcre2_general_context *gcontext, const uint8_t *tables)
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{
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if (gcontext)
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gcontext->memctl.free((void *)tables, gcontext->memctl.memory_data);
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else
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free((void *)tables);
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}
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#endif
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/* End of pcre2_maketables.c */
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