Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 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 | # 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 |
| 62 | part of the library, the store is obtained via pcre_malloc(), but when compiled |
| 63 | inside dftables, use malloc(). |
| 64 | |
| 65 | Arguments: none |
| 66 | Returns: pointer to the contiguous block of data |
| 67 | */ |
| 68 | |
| 69 | const unsigned char * |
| 70 | pcre_maketables(void) |
| 71 | { |
| 72 | unsigned char *yield, *p; |
| 73 | int i; |
| 74 | |
| 75 | #ifndef DFTABLES |
| 76 | yield = (unsigned char*)(pcre_malloc)(tables_length); |
| 77 | #else |
| 78 | yield = (unsigned char*)malloc(tables_length); |
| 79 | #endif |
| 80 | |
| 81 | if (yield == NULL) return NULL; |
| 82 | p = yield; |
| 83 | |
| 84 | /* First comes the lower casing table */ |
| 85 | |
| 86 | for (i = 0; i < 256; i++) *p++ = tolower(i); |
| 87 | |
| 88 | /* Next the case-flipping table */ |
| 89 | |
| 90 | for (i = 0; i < 256; i++) *p++ = islower(i)? toupper(i) : tolower(i); |
| 91 | |
| 92 | /* Then the character class tables. Don't try to be clever and save effort on |
| 93 | exclusive ones - in some locales things may be different. Note that the table |
| 94 | for "space" includes everything "isspace" gives, including VT in the default |
| 95 | locale. This makes it work for the POSIX class [:space:]. Note also that it is |
| 96 | possible for a character to be alnum or alpha without being lower or upper, |
| 97 | such as "male and female ordinals" (\xAA and \xBA) in the fr_FR locale (at |
| 98 | least under Debian Linux's locales as of 12/2005). So we must test for alnum |
| 99 | specially. */ |
| 100 | |
| 101 | memset(p, 0, cbit_length); |
| 102 | for (i = 0; i < 256; i++) |
| 103 | { |
| 104 | if (isdigit(i)) p[cbit_digit + i/8] |= 1 << (i&7); |
| 105 | if (isupper(i)) p[cbit_upper + i/8] |= 1 << (i&7); |
| 106 | if (islower(i)) p[cbit_lower + i/8] |= 1 << (i&7); |
| 107 | if (isalnum(i)) p[cbit_word + i/8] |= 1 << (i&7); |
| 108 | if (i == '_') p[cbit_word + i/8] |= 1 << (i&7); |
| 109 | if (isspace(i)) p[cbit_space + i/8] |= 1 << (i&7); |
| 110 | if (isxdigit(i))p[cbit_xdigit + i/8] |= 1 << (i&7); |
| 111 | if (isgraph(i)) p[cbit_graph + i/8] |= 1 << (i&7); |
| 112 | if (isprint(i)) p[cbit_print + i/8] |= 1 << (i&7); |
| 113 | if (ispunct(i)) p[cbit_punct + i/8] |= 1 << (i&7); |
| 114 | if (iscntrl(i)) p[cbit_cntrl + i/8] |= 1 << (i&7); |
| 115 | } |
| 116 | p += cbit_length; |
| 117 | |
| 118 | /* Finally, the character type table. In this, we exclude VT from the white |
| 119 | space chars, because Perl doesn't recognize it as such for \s and for comments |
| 120 | within regexes. */ |
| 121 | |
| 122 | for (i = 0; i < 256; i++) |
| 123 | { |
| 124 | int x = 0; |
| 125 | if (i != 0x0b && isspace(i)) x += ctype_space; |
| 126 | if (isalpha(i)) x += ctype_letter; |
| 127 | if (isdigit(i)) x += ctype_digit; |
| 128 | if (isxdigit(i)) x += ctype_xdigit; |
| 129 | if (isalnum(i) || i == '_') x += ctype_word; |
| 130 | |
| 131 | /* Note: strchr includes the terminating zero in the characters it considers. |
| 132 | In this instance, that is ok because we want binary zero to be flagged as a |
| 133 | meta-character, which in this sense is any character that terminates a run |
| 134 | of data characters. */ |
| 135 | |
| 136 | if (strchr("\\*+?{^.$|()[", i) != 0) x += ctype_meta; |
| 137 | *p++ = x; |
| 138 | } |
| 139 | |
| 140 | return yield; |
| 141 | } |
| 142 | |
| 143 | /* End of pcre_maketables.c */ |