110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
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/*************************************************
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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) 1997-1999 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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-----------------------------------------------------------------------------
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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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unsigned const 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 = (pcre_malloc)(tables_length);
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#else
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yield = 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 */
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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] |= 1 << (i&7);
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if (isalnum(i) || i == '_')
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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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}
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p += cbit_length;
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/* Finally, the character type table */
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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 (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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if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta;
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*p++ = x;
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}
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return yield;
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}
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/* End of maketables.c */
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