ossp-pkg/str/str_pcre_mk.c
1.3
/*************************************************
* 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) 1997-1999 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 is a support program to generate the file chartables.c, containing
character tables of various kinds. They are built according to the default C
locale and used as the default tables by PCRE. Now that pcre_maketables is
a function visible to the outside world, we make use of its code from here in
order to be consistent. */
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "str_pcre_p.h"
#define DFTABLES /* maketables.c notices this */
/*************************************************
* 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
*/
unsigned const 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 */
memset(p, 0, cbit_length);
for (i = 0; i < 256; i++)
{
if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
if (isalnum(i) || i == '_')
p[cbit_word + i/8] |= 1 << (i&7);
if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
}
p += cbit_length;
/* Finally, the character type table */
for (i = 0; i < 256; i++)
{
int x = 0;
if (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;
}
/*
* MAIN PROCEDURE
*/
int main(void)
{
int i;
unsigned const char *tables = pcre_maketables();
printf(
"\n"
"static unsigned char pcre_default_tables[] = {\n\n"
"/* This table is a lower casing table. */\n\n");
printf(" ");
for (i = 0; i < 256; i++)
{
if ((i & 7) == 0 && i != 0) printf("\n ");
printf("%3d", *tables++);
if (i != 255) printf(",");
}
printf(",\n\n");
printf("/* This table is a case flipping table. */\n\n");
printf(" ");
for (i = 0; i < 256; i++)
{
if ((i & 7) == 0 && i != 0) printf("\n ");
printf("%3d", *tables++);
if (i != 255) printf(",");
}
printf(",\n\n");
printf(
"/* This table contains bit maps for digits, 'word' chars, and white\n"
"space. Each map is 32 bytes long and the bits run from the least\n"
"significant end of each byte. */\n\n");
printf(" ");
for (i = 0; i < cbit_length; i++)
{
if ((i & 7) == 0 && i != 0)
{
if ((i & 31) == 0) printf("\n");
printf("\n ");
}
printf("0x%02x", *tables++);
if (i != cbit_length - 1) printf(",");
}
printf(" ,\n\n");
printf(
"/* This table identifies various classes of character by individual bits:\n"
" 0x%02x white space character\n"
" 0x%02x letter\n"
" 0x%02x decimal digit\n"
" 0x%02x hexadecimal digit\n"
" 0x%02x alphanumeric or '_'\n"
" 0x%02x regular expression metacharacter or binary zero\n*/\n\n",
ctype_space, ctype_letter, ctype_digit, ctype_xdigit, ctype_word,
ctype_meta);
printf(" ");
for (i = 0; i < 256; i++)
{
if ((i & 7) == 0 && i != 0)
{
printf(" /* ");
if (isprint(i-8)) printf(" %c -", i-8);
else printf("%3d-", i-8);
if (isprint(i-1)) printf(" %c ", i-1);
else printf("%3d", i-1);
printf(" */\n ");
}
printf("0x%02x", *tables++);
if (i != 255) printf(",");
}
printf("};/* ");
if (isprint(i-8)) printf(" %c -", i-8);
else printf("%3d-", i-8);
if (isprint(i-1)) printf(" %c ", i-1);
else printf("%3d", i-1);
printf(" */\n\n/* End of chartables.c */\n");
return 0;
}
/* End of dftables.c */
