| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2017 Mark Wooding |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file lib/regexp.c |
| 19 | * @brief Regular expressions |
| 20 | */ |
| 21 | #include "common.h" |
| 22 | |
| 23 | #include "regexp.h" |
| 24 | #include "mem.h" |
| 25 | |
| 26 | #ifdef HAVE_LIBPCRE2 |
| 27 | |
| 28 | static pcre2_general_context *genctx = 0; |
| 29 | static pcre2_compile_context *compctx = 0; |
| 30 | |
| 31 | static void *rxalloc(size_t sz, void attribute((unused)) *q) |
| 32 | { return xmalloc(sz); } |
| 33 | static void rxfree(void *p, void attribute((unused)) *q) |
| 34 | { xfree(p); } |
| 35 | |
| 36 | void regexp_setup(void) |
| 37 | { |
| 38 | if(genctx) { |
| 39 | pcre2_compile_context_free(compctx); |
| 40 | pcre2_general_context_free(genctx); |
| 41 | } |
| 42 | genctx = pcre2_general_context_create(rxalloc, rxfree, 0); |
| 43 | compctx = pcre2_compile_context_create(genctx); |
| 44 | } |
| 45 | |
| 46 | regexp *regexp_compile(const char *pat, unsigned f, |
| 47 | char *errbuf, size_t errlen, size_t *erroff_out) |
| 48 | { |
| 49 | int errcode; |
| 50 | PCRE2_SIZE erroff; |
| 51 | regexp *re; |
| 52 | |
| 53 | re = pcre2_compile((PCRE2_SPTR)pat, strlen(pat), f, |
| 54 | &errcode, &erroff, compctx); |
| 55 | if(!re) { |
| 56 | *erroff_out = erroff; |
| 57 | pcre2_get_error_message(errcode, (PCRE2_UCHAR *)errbuf, errlen); |
| 58 | } |
| 59 | return re; |
| 60 | } |
| 61 | |
| 62 | int regexp_match(const regexp *re, const char *s, size_t n, unsigned f, |
| 63 | size_t *ov, size_t on) |
| 64 | { |
| 65 | int rc; |
| 66 | pcre2_match_data *m; |
| 67 | PCRE2_SIZE *ovp; |
| 68 | size_t i; |
| 69 | |
| 70 | m = pcre2_match_data_create(on, genctx); |
| 71 | rc = pcre2_match(re, (PCRE2_SPTR)s, n, 0, f, m, 0); |
| 72 | ovp = pcre2_get_ovector_pointer(m); |
| 73 | for(i = 0; i < on; i++) ov[i] = ovp[i]; |
| 74 | pcre2_match_data_free(m); |
| 75 | return rc; |
| 76 | } |
| 77 | |
| 78 | void regexp_free(regexp *re) |
| 79 | { pcre2_code_free(re); } |
| 80 | |
| 81 | #else |
| 82 | |
| 83 | void regexp_setup(void) |
| 84 | { |
| 85 | pcre_malloc = xmalloc; |
| 86 | pcre_free = xfree; |
| 87 | } |
| 88 | |
| 89 | regexp *regexp_compile(const char *pat, unsigned f, |
| 90 | char *errbuf, size_t errlen, size_t *erroff_out) |
| 91 | { |
| 92 | char *p; |
| 93 | const char *e; |
| 94 | int erroff; |
| 95 | regexp *re; |
| 96 | size_t i; |
| 97 | |
| 98 | re = pcre_compile(pat, f, &e, &erroff, 0); |
| 99 | if(!re) { |
| 100 | *erroff_out = erroff; |
| 101 | for(p = errbuf, i = errlen - 1; i && *e; i--) *p++ = *e++; |
| 102 | *p = 0; |
| 103 | } |
| 104 | return re; |
| 105 | } |
| 106 | |
| 107 | int regexp_match(const regexp *re, const char *s, size_t n, unsigned f, |
| 108 | size_t *ov, size_t on) |
| 109 | { |
| 110 | int rc; |
| 111 | int *myov; |
| 112 | size_t i; |
| 113 | |
| 114 | myov = xmalloc(on*sizeof(*myov)); |
| 115 | rc = pcre_exec(re, 0, s, n, 0, f, myov, on); |
| 116 | for(i = 0; i < on; i++) ov[i] = myov[i]; |
| 117 | xfree(myov); |
| 118 | return rc; |
| 119 | } |
| 120 | |
| 121 | void regexp_free(regexp *re) |
| 122 | { pcre_free(re); } |
| 123 | |
| 124 | #endif |
| 125 | |
| 126 | /* |
| 127 | Local Variables: |
| 128 | c-basic-offset:2 |
| 129 | comment-column:40 |
| 130 | End: |
| 131 | */ |