code/trunk/maketables.c

/*************************************************
*      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 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
*/

unsigned const char *
pcre_maketables(void)
{
unsigned char *yield, *p;
int i;

#ifndef DFTABLES
yield = (pcre_malloc)(tables_length);
#else
yield = 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;
}

/* End of maketables.c */
1	nigel	3	/*************************************************
2			* Perl-Compatible Regular Expressions *
3			*************************************************/
4
5			/*
6			PCRE is a library of functions to support regular expressions whose syntax
7			and semantics are as close as possible to those of the Perl 5 language.
8
9			Written by: Philip Hazel <ph10@cam.ac.uk>
10
11	nigel	27	Copyright (c) 1997-1999 University of Cambridge
12	nigel	3
13			-----------------------------------------------------------------------------
14			Permission is granted to anyone to use this software for any purpose on any
15			computer system, and to redistribute it freely, subject to the following
16			restrictions:
17
18			1. This software is distributed in the hope that it will be useful,
19			but WITHOUT ANY WARRANTY; without even the implied warranty of
20			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21
22			2. The origin of this software must not be misrepresented, either by
23			explicit claim or by omission.
24
25			3. Altered versions must be plainly marked as such, and must not be
26			misrepresented as being the original software.
27	nigel	29
28			4. If PCRE is embedded in any software that is released under the GNU
29			General Purpose Licence (GPL), then the terms of that licence shall
30			supersede any condition above with which it is incompatible.
31	nigel	3	-----------------------------------------------------------------------------
32
33			See the file Tech.Notes for some information on the internals.
34			*/
35
36
37	nigel	25	/* This file is compiled on its own as part of the PCRE library. However,
38	nigel	27	it is also included in the compilation of dftables.c, in which case the macro
39			DFTABLES is defined. */
40	nigel	3
41	nigel	27	#ifndef DFTABLES
42	nigel	3	#include "internal.h"
43	nigel	25	#endif
44	nigel	3
45	nigel	25
46
47			/*************************************************
48			* Create PCRE character tables *
49			*************************************************/
50
51			/* This function builds a set of character tables for use by PCRE and returns
52			a pointer to them. They are build using the ctype functions, and consequently
53			their contents will depend upon the current locale setting. When compiled as
54			part of the library, the store is obtained via pcre_malloc(), but when compiled
55	nigel	27	inside dftables, use malloc().
56	nigel	25
57			Arguments: none
58			Returns: pointer to the contiguous block of data
59			*/
60
61			unsigned const char *
62			pcre_maketables(void)
63	nigel	3	{
64	nigel	25	unsigned char yield, p;
65	nigel	3	int i;
66
67	nigel	27	#ifndef DFTABLES
68	nigel	25	yield = (pcre_malloc)(tables_length);
69			#else
70			yield = malloc(tables_length);
71			#endif
72	nigel	3
73	nigel	25	if (yield == NULL) return NULL;
74			p = yield;
75	nigel	3
76	nigel	25	/* First comes the lower casing table */
77	nigel	3
78	nigel	25	for (i = 0; i < 256; i++) *p++ = tolower(i);
79	nigel	3
80	nigel	25	/* Next the case-flipping table */
81	nigel	3
82	nigel	25	for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
83	nigel	3
84	nigel	25	/* Then the character class tables */
85
86			memset(p, 0, cbit_length);
87	nigel	3	for (i = 0; i < 256; i++)
88			{
89	nigel	25	if (isdigit(i)) p[cbit_digit + i/8] \|= 1 << (i&7);
90	nigel	3	if (isalnum(i) \|\| i == '_')
91	nigel	25	p[cbit_word + i/8] \|= 1 << (i&7);
92			if (isspace(i)) p[cbit_space + i/8] \|= 1 << (i&7);
93	nigel	3	}
94	nigel	25	p += cbit_length;
95	nigel	3
96	nigel	25	/* Finally, the character type table */
97	nigel	3
98			for (i = 0; i < 256; i++)
99			{
100			int x = 0;
101			if (isspace(i)) x += ctype_space;
102			if (isalpha(i)) x += ctype_letter;
103			if (isdigit(i)) x += ctype_digit;
104			if (isxdigit(i)) x += ctype_xdigit;
105			if (isalnum(i) \|\| i == '_') x += ctype_word;
106			if (strchr("*+?{^.$\|()[", i) != 0) x += ctype_meta;
107	nigel	25	*p++ = x;
108	nigel	3	}
109
110	nigel	25	return yield;
111	nigel	3	}
112
113			/* End of maketables.c */