/[pcre]/code/tags/pcre-4.3/maketables.c
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Contents of /code/tags/pcre-4.3/maketables.c

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Revision 27 - (show annotations) (download)
Sat Feb 24 21:38:49 2007 UTC (7 years, 8 months ago) by nigel
Original Path: code/trunk/maketables.c
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File size: 3132 byte(s)
Load pcre-2.02 into code/trunk.

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
29 See the file Tech.Notes for some information on the internals.
30 */
31
32
33 /* This file is compiled on its own as part of the PCRE library. However,
34 it is also included in the compilation of dftables.c, in which case the macro
35 DFTABLES is defined. */
36
37 #ifndef DFTABLES
38 #include "internal.h"
39 #endif
40
41
42
43 /*************************************************
44 * Create PCRE character tables *
45 *************************************************/
46
47 /* This function builds a set of character tables for use by PCRE and returns
48 a pointer to them. They are build using the ctype functions, and consequently
49 their contents will depend upon the current locale setting. When compiled as
50 part of the library, the store is obtained via pcre_malloc(), but when compiled
51 inside dftables, use malloc().
52
53 Arguments: none
54 Returns: pointer to the contiguous block of data
55 */
56
57 unsigned const char *
58 pcre_maketables(void)
59 {
60 unsigned char *yield, *p;
61 int i;
62
63 #ifndef DFTABLES
64 yield = (pcre_malloc)(tables_length);
65 #else
66 yield = malloc(tables_length);
67 #endif
68
69 if (yield == NULL) return NULL;
70 p = yield;
71
72 /* First comes the lower casing table */
73
74 for (i = 0; i < 256; i++) *p++ = tolower(i);
75
76 /* Next the case-flipping table */
77
78 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
79
80 /* Then the character class tables */
81
82 memset(p, 0, cbit_length);
83 for (i = 0; i < 256; i++)
84 {
85 if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
86 if (isalnum(i) || i == '_')
87 p[cbit_word + i/8] |= 1 << (i&7);
88 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
89 }
90 p += cbit_length;
91
92 /* Finally, the character type table */
93
94 for (i = 0; i < 256; i++)
95 {
96 int x = 0;
97 if (isspace(i)) x += ctype_space;
98 if (isalpha(i)) x += ctype_letter;
99 if (isdigit(i)) x += ctype_digit;
100 if (isxdigit(i)) x += ctype_xdigit;
101 if (isalnum(i) || i == '_') x += ctype_word;
102 if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta;
103 *p++ = x;
104 }
105
106 return yield;
107 }
108
109 /* End of maketables.c */

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