Annotation of embedaddon/pcre/pcre_maketables.c, revision 1.1.1.4
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
1.1.1.2 misho 9: Copyright (c) 1997-2012 University of Cambridge
1.1 misho 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: # ifdef HAVE_CONFIG_H
49: # include "config.h"
50: # endif
51: # include "pcre_internal.h"
52: #endif
53:
54:
55: /*************************************************
56: * Create PCRE character tables *
57: *************************************************/
58:
59: /* This function builds a set of character tables for use by PCRE and returns
60: a pointer to them. They are build using the ctype functions, and consequently
61: their contents will depend upon the current locale setting. When compiled as
1.1.1.2 misho 62: part of the library, the store is obtained via PUBL(malloc)(), but when
63: compiled inside dftables, use malloc().
1.1 misho 64:
65: Arguments: none
66: Returns: pointer to the contiguous block of data
67: */
68:
1.1.1.3 misho 69: #if defined COMPILE_PCRE8
1.1 misho 70: const unsigned char *
71: pcre_maketables(void)
1.1.1.3 misho 72: #elif defined COMPILE_PCRE16
1.1.1.2 misho 73: const unsigned char *
74: pcre16_maketables(void)
1.1.1.3 misho 75: #elif defined COMPILE_PCRE32
76: const unsigned char *
77: pcre32_maketables(void)
1.1.1.2 misho 78: #endif
1.1 misho 79: {
80: unsigned char *yield, *p;
81: int i;
82:
83: #ifndef DFTABLES
1.1.1.2 misho 84: yield = (unsigned char*)(PUBL(malloc))(tables_length);
1.1 misho 85: #else
86: yield = (unsigned char*)malloc(tables_length);
87: #endif
88:
89: if (yield == NULL) return NULL;
90: p = yield;
91:
92: /* First comes the lower casing table */
93:
94: for (i = 0; i < 256; i++) *p++ = tolower(i);
95:
96: /* Next the case-flipping table */
97:
98: for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i);
99:
100: /* Then the character class tables. Don't try to be clever and save effort on
1.1.1.4 ! misho 101: exclusive ones - in some locales things may be different.
! 102:
! 103: Note that the table for "space" includes everything "isspace" gives, including
! 104: VT in the default locale. This makes it work for the POSIX class [:space:].
! 105: From release 8.34 is is also correct for Perl space, because Perl added VT at
! 106: release 5.18.
! 107:
! 108: Note also that it is possible for a character to be alnum or alpha without
! 109: being lower or upper, such as "male and female ordinals" (\xAA and \xBA) in the
! 110: fr_FR locale (at least under Debian Linux's locales as of 12/2005). So we must
! 111: test for alnum specially. */
1.1 misho 112:
113: memset(p, 0, cbit_length);
114: for (i = 0; i < 256; i++)
115: {
116: if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7);
117: if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7);
118: if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7);
119: if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7);
120: if (i == '_') p[cbit_word + i/8] |= 1 << (i&7);
121: if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7);
122: if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7);
123: if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7);
124: if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7);
125: if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7);
126: if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7);
127: }
128: p += cbit_length;
129:
1.1.1.4 ! misho 130: /* Finally, the character type table. In this, we used to exclude VT from the
! 131: white space chars, because Perl didn't recognize it as such for \s and for
! 132: comments within regexes. However, Perl changed at release 5.18, so PCRE changed
! 133: at release 8.34. */
1.1 misho 134:
135: for (i = 0; i < 256; i++)
136: {
137: int x = 0;
1.1.1.4 ! misho 138: if (isspace(i)) x += ctype_space;
1.1 misho 139: if (isalpha(i)) x += ctype_letter;
140: if (isdigit(i)) x += ctype_digit;
141: if (isxdigit(i)) x += ctype_xdigit;
142: if (isalnum(i) || i == '_') x += ctype_word;
143:
144: /* Note: strchr includes the terminating zero in the characters it considers.
145: In this instance, that is ok because we want binary zero to be flagged as a
146: meta-character, which in this sense is any character that terminates a run
147: of data characters. */
148:
149: if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta;
150: *p++ = x;
151: }
152:
153: return yield;
154: }
155:
156: /* End of pcre_maketables.c */
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