/*************************************************
 *      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 <ph10@cam.ac.uk>
 
 Copyright (c) 1997-2003 University of Cambridge
 
 -----------------------------------------------------------------------------
 Permission is granted to anyone to use this software for any purpose on any
 computer system, and to redistribute it freely, subject to the following
 restrictions:
 
 1. This software is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 2. The origin of this software must not be misrepresented, either by
 explicit claim or by omission.
 
 3. Altered versions must be plainly marked as such, and must not be
 misrepresented as being the original software.
 
 4. If PCRE is embedded in any software that is released under the GNU
 General Purpose Licence (GPL), then the terms of that licence shall
 supersede any condition above with which it is incompatible.
 -----------------------------------------------------------------------------
 
 See the file Tech.Notes for some information on the internals.
 */


/* This 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
#include "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:]. */
    
    memset(p, 0, cbit_length);
    for (i = 0; i < 256; i++)
    {
        if (isdigit(i))
        {
            p[cbit_digit  + i/8] |= 1 << (i&7);
            p[cbit_word   + i/8] |= 1 << (i&7);
        }
        if (isupper(i))
        {
            p[cbit_upper  + i/8] |= 1 << (i&7);
            p[cbit_word   + i/8] |= 1 << (i&7);
        }
        if (islower(i))
        {
            p[cbit_lower  + i/8] |= 1 << (i&7);
            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;
        if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta;
        *p++ = x;
    }
    
    return yield;
}

/* End of maketables.c */