/[pcre]/code/tags/pcre-2.05/maketables.c
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Contents of /code/tags/pcre-2.05/maketables.c

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Revision 34 - (show annotations) (download)
Sat Feb 24 21:39:03 2007 UTC (7 years, 8 months ago) by nigel
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Tag code/trunk as code/tags/pcre-2.05.

1 /*************************************************
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 Copyright (c) 1997-1999 University of Cambridge
12
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
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 -----------------------------------------------------------------------------
32
33 See the file Tech.Notes for some information on the internals.
34 */
35
36
37 /* This file is compiled on its own as part of the PCRE library. However,
38 it is also included in the compilation of dftables.c, in which case the macro
39 DFTABLES is defined. */
40
41 #ifndef DFTABLES
42 #include "internal.h"
43 #endif
44
45
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 inside dftables, use malloc().
56
57 Arguments: none
58 Returns: pointer to the contiguous block of data
59 */
60
61 unsigned const char *
62 pcre_maketables(void)
63 {
64 unsigned char *yield, *p;
65 int i;
66
67 #ifndef DFTABLES
68 yield = (pcre_malloc)(tables_length);
69 #else
70 yield = malloc(tables_length);
71 #endif
72
73 if (yield == NULL) return NULL;
74 p = yield;
75
76 /* First comes the lower casing table */
77
78 for (i = 0; i < 256; i++) *p++ = tolower(i);
79
80 /* Next the case-flipping table */
81
82 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
83
84 /* Then the character class tables */
85
86 memset(p, 0, cbit_length);
87 for (i = 0; i < 256; i++)
88 {
89 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
90 if (isalnum(i) || i == '_')
91 p[cbit_word + i/8] |= 1 << (i&7);
92 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
93 }
94 p += cbit_length;
95
96 /* Finally, the character type table */
97
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 *p++ = x;
108 }
109
110 return yield;
111 }
112
113 /* End of maketables.c */

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