Annotation of embedaddon/php/ext/pcre/pcrelib/pcre_maketables.c, revision 1.1.1.1
1.1 misho 1: /*************************************************
2: * Perl-Compatible Regular Expressions *
3: *************************************************/
4:
5: /* PCRE is a library of functions to support regular expressions whose syntax
6: and semantics are as close as possible to those of the Perl 5 language.
7:
8: Written by Philip Hazel
9: Copyright (c) 1997-2008 University of Cambridge
10:
11: -----------------------------------------------------------------------------
12: Redistribution and use in source and binary forms, with or without
13: modification, are permitted provided that the following conditions are met:
14:
15: * Redistributions of source code must retain the above copyright notice,
16: this list of conditions and the following disclaimer.
17:
18: * Redistributions in binary form must reproduce the above copyright
19: notice, this list of conditions and the following disclaimer in the
20: documentation and/or other materials provided with the distribution.
21:
22: * Neither the name of the University of Cambridge nor the names of its
23: contributors may be used to endorse or promote products derived from
24: this software without specific prior written permission.
25:
26: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: POSSIBILITY OF SUCH DAMAGE.
37: -----------------------------------------------------------------------------
38: */
39:
40:
41: /* This module contains the external function pcre_maketables(), which builds
42: character tables for PCRE in the current locale. The file is compiled on its
43: own as part of the PCRE library. However, it is also included in the
44: compilation of dftables.c, in which case the macro DFTABLES is defined. */
45:
46:
47: #ifndef DFTABLES
48: # include "config.h"
49: # include "pcre_internal.h"
50: #endif
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 on
91: exclusive ones - in some locales things may be different. Note that the table
92: for "space" includes everything "isspace" gives, including VT in the default
93: locale. This makes it work for the POSIX class [:space:]. Note also that it is
94: possible for a character to be alnum or alpha without being lower or upper,
95: such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at
96: least under Debian Linux's locales as of 12/2005). So we must test for alnum
97: specially. */
98:
99: memset(p, 0, cbit_length);
100: for (i = 0; i < 256; i++)
101: {
102: if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
103: if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
104: if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
105: if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
106: if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
107: if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
108: if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
109: if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
110: if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
111: if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
112: if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
113: }
114: p += cbit_length;
115:
116: /* Finally, the character type table. In this, we exclude VT from the white
117: space chars, because Perl doesn't recognize it as such for \s and for comments
118: within regexes. */
119:
120: for (i = 0; i < 256; i++)
121: {
122: int x = 0;
123: if (i != 0x0b && isspace(i)) x += ctype_space;
124: if (isalpha(i)) x += ctype_letter;
125: if (isdigit(i)) x += ctype_digit;
126: if (isxdigit(i)) x += ctype_xdigit;
127: if (isalnum(i) || i == '_') x += ctype_word;
128:
129: /* Note: strchr includes the terminating zero in the characters it considers.
130: In this instance, that is ok because we want binary zero to be flagged as a
131: meta-character, which in this sense is any character that terminates a run
132: of data characters. */
133:
134: if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
135: *p++ = x;
136: }
137:
138: return yield;
139: }
140:
141: /* End of pcre_maketables.c */
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