/[pcre]/code/trunk/maketables.c
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Contents of /code/trunk/maketables.c

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Revision 75 - (show annotations)
Sat Feb 24 21:40:37 2007 UTC (12 years, 4 months ago) by nigel
File MIME type: text/plain
File size: 5173 byte(s)
Load pcre-5.0 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) 1997-2003 University of Cambridge
12
13 -----------------------------------------------------------------------------
14 Redistribution and use in source and binary forms, with or without
15 modification, are permitted provided that the following conditions are met:
16
17 * Redistributions of source code must retain the above copyright notice,
18 this list of conditions and the following disclaimer.
19
20 * Redistributions in binary form must reproduce the above copyright
21 notice, this list of conditions and the following disclaimer in the
22 documentation and/or other materials provided with the distribution.
23
24 * Neither the name of the University of Cambridge nor the names of its
25 contributors may be used to endorse or promote products derived from
26 this software without specific prior written permission.
27
28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
29 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
32 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 POSSIBILITY OF SUCH DAMAGE.
39 -----------------------------------------------------------------------------
40 */
41
42
43 /* This file is compiled on its own as part of the PCRE library. However,
44 it is also included in the compilation of dftables.c, in which case the macro
45 DFTABLES is defined. */
46
47 #ifndef DFTABLES
48 #include "internal.h"
49 #endif
50
51
52
53 /*************************************************
54 * Create PCRE character tables *
55 *************************************************/
56
57 /* This function builds a set of character tables for use by PCRE and returns
58 a pointer to them. They are build using the ctype functions, and consequently
59 their contents will depend upon the current locale setting. When compiled as
60 part of the library, the store is obtained via pcre_malloc(), but when compiled
61 inside dftables, use malloc().
62
63 Arguments: none
64 Returns: pointer to the contiguous block of data
65 */
66
67 const unsigned char *
68 pcre_maketables(void)
69 {
70 unsigned char *yield, *p;
71 int i;
72
73 #ifndef DFTABLES
74 yield = (unsigned char*)(pcre_malloc)(tables_length);
75 #else
76 yield = (unsigned char*)malloc(tables_length);
77 #endif
78
79 if (yield == NULL) return NULL;
80 p = yield;
81
82 /* First comes the lower casing table */
83
84 for (i = 0; i < 256; i++) *p++ = tolower(i);
85
86 /* Next the case-flipping table */
87
88 for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
89
90 /* Then the character class tables. Don't try to be clever and save effort
91 on exclusive ones - in some locales things may be different. Note that the
92 table for "space" includes everything "isspace" gives, including VT in the
93 default locale. This makes it work for the POSIX class [:space:]. */
94
95 memset(p, 0, cbit_length);
96 for (i = 0; i < 256; i++)
97 {
98 if (isdigit(i))
99 {
100 p[cbit_digit + i/8] |= 1 << (i&7);
101 p[cbit_word + i/8] |= 1 << (i&7);
102 }
103 if (isupper(i))
104 {
105 p[cbit_upper + i/8] |= 1 << (i&7);
106 p[cbit_word + i/8] |= 1 << (i&7);
107 }
108 if (islower(i))
109 {
110 p[cbit_lower + i/8] |= 1 << (i&7);
111 p[cbit_word + i/8] |= 1 << (i&7);
112 }
113 if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
114 if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
115 if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
116 if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
117 if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
118 if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
119 if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
120 }
121 p += cbit_length;
122
123 /* Finally, the character type table. In this, we exclude VT from the white
124 space chars, because Perl doesn't recognize it as such for \s and for comments
125 within regexes. */
126
127 for (i = 0; i < 256; i++)
128 {
129 int x = 0;
130 if (i != 0x0b && isspace(i)) x += ctype_space;
131 if (isalpha(i)) x += ctype_letter;
132 if (isdigit(i)) x += ctype_digit;
133 if (isxdigit(i)) x += ctype_xdigit;
134 if (isalnum(i) || i == '_') x += ctype_word;
135
136 /* Note: strchr includes the terminating zero in the characters it considers.
137 In this instance, that is ok because we want binary zero to be flagged as a
138 meta-character, which in this sense is any character that terminates a run
139 of data characters. */
140
141 if (strchr("*+?{^.$|()[", i) != 0) x += ctype_meta; *p++ = x; }
142
143 return yield;
144 }
145
146 /* End of maketables.c */

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