mirror of git://git.psyced.org/git/psyclpc
141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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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 <ph10@cam.ac.uk>
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Copyright (c) 1997-2003 University of Cambridge
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-----------------------------------------------------------------------------
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Permission is granted to anyone to use this software for any purpose on any
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computer system, and to redistribute it freely, subject to the following
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restrictions:
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1. This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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2. The origin of this software must not be misrepresented, either by
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explicit claim or by omission.
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3. Altered versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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4. If PCRE is embedded in any software that is released under the GNU
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General Purpose Licence (GPL), then the terms of that licence shall
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supersede any condition above with which it is incompatible.
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-----------------------------------------------------------------------------
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See the file Tech.Notes for some information on the internals.
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*/
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/* This file is compiled on its own as part of the PCRE library. However,
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it is also included in the compilation of dftables.c, in which case the macro
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DFTABLES is defined. */
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#ifndef DFTABLES
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#include "internal.h"
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#endif
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/*************************************************
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* Create PCRE character tables *
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*************************************************/
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/* This function builds a set of character tables for use by PCRE 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 pcre_malloc(), but when compiled
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inside dftables, use malloc().
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Arguments: none
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Returns: pointer to the contiguous block of data
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*/
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const unsigned char *
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pcre_maketables(void)
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{
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unsigned char *yield, *p;
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int i;
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#ifndef DFTABLES
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yield = (unsigned char*)(pcre_malloc)(tables_length);
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#else
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yield = (unsigned char*)malloc(tables_length);
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#endif
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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
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on exclusive ones - in some locales things may be different. Note that the
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table for "space" includes everything "isspace" gives, including VT in the
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default locale. This makes it work for the POSIX class [:space:]. */
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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))
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{
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p[cbit_digit + i/8] |= 1 << (i&7);
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p[cbit_word + i/8] |= 1 << (i&7);
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}
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if (isupper(i))
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{
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p[cbit_upper + i/8] |= 1 << (i&7);
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p[cbit_word + i/8] |= 1 << (i&7);
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}
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if (islower(i))
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{
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p[cbit_lower + i/8] |= 1 << (i&7);
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p[cbit_word + i/8] |= 1 << (i&7);
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}
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if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
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if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
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if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
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if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
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if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
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if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
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if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (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 exclude VT from the white
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space chars, because Perl doesn't recognize it as such for \s and for comments
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within regexes. */
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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 (i != 0x0b && isspace(i)) x += ctype_space;
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if (isalpha(i)) x += ctype_letter;
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if (isdigit(i)) x += ctype_digit;
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if (isxdigit(i)) x += ctype_xdigit;
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if (isalnum(i) || i == '_') x += ctype_word;
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/* Note: strchr includes the terminating zero in the characters it considers.
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In this instance, that is ok because we want binary zero to be flagged as a
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meta-character, which in this sense is any character that terminates a run
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of data characters. */
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if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; *p++ = x; }
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return yield;
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}
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/* End of maketables.c */
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