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/****************************************************************************
* bfs *
* Copyright (C) 2022 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
#include "regex.h"
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#if BFS_WITH_ONIGURUMA
# include <oniguruma.h>
#else
# include <regex.h>
#endif
struct bfs_regex {
#if BFS_WITH_ONIGURUMA
OnigRegex impl;
#else
regex_t impl;
#endif
};
struct bfs_regex *bfs_regcomp(const char *expr, enum bfs_regex_type type, enum bfs_regcomp_flags flags, int *err) {
#if BFS_WITH_ONIGURUMA
static bool onig_initialized = false;
if (!onig_initialized) {
OnigEncoding encs[] = {ONIG_ENCODING_UTF8};
*err = onig_initialize(encs, sizeof(encs)/sizeof(encs[0]));
if (*err != ONIG_NORMAL) {
return NULL;
}
onig_initialized = true;
}
#endif
struct bfs_regex *regex = malloc(sizeof(*regex));
if (!regex) {
#if BFS_WITH_ONIGURUMA
*err = ONIGERR_MEMORY;
#else
*err = REG_ESPACE;
#endif
return NULL;
}
#if BFS_WITH_ONIGURUMA
OnigSyntaxType *syntax = NULL;
switch (type) {
case BFS_REGEX_POSIX_BASIC:
syntax = ONIG_SYNTAX_POSIX_BASIC;
break;
case BFS_REGEX_POSIX_EXTENDED:
syntax = ONIG_SYNTAX_POSIX_EXTENDED;
break;
case BFS_REGEX_EMACS:
syntax = ONIG_SYNTAX_EMACS;
break;
case BFS_REGEX_GREP:
syntax = ONIG_SYNTAX_GREP;
break;
}
assert(syntax);
OnigOptionType options = syntax->options;
if (flags & BFS_REGEX_ICASE) {
options |= ONIG_OPTION_IGNORECASE;
}
const unsigned char *uexpr = (const unsigned char *)expr;
const unsigned char *end = uexpr + strlen(expr);
*err = onig_new(®ex->impl, uexpr, end, options, ONIG_ENCODING_UTF8, syntax, NULL);
if (*err != ONIG_NORMAL) {
goto fail;
}
#else
int cflags = 0;
switch (type) {
case BFS_REGEX_POSIX_BASIC:
break;
case BFS_REGEX_POSIX_EXTENDED:
cflags |= REG_EXTENDED;
break;
default:
*err = REG_BADPAT;
goto fail;
}
if (flags & BFS_REGEX_ICASE) {
cflags |= REG_ICASE;
}
*err = regcomp(®ex->impl, expr, cflags);
if (*err != 0) {
goto fail;
}
#endif
return regex;
fail:
free(regex);
return NULL;
}
bool bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags flags, int *err) {
size_t len = strlen(str);
#if BFS_WITH_ONIGURUMA
const unsigned char *ustr = (const unsigned char *)str;
const unsigned char *end = ustr + len;
int ret;
if (flags & BFS_REGEX_ANCHOR) {
ret = onig_match(regex->impl, ustr, end, ustr, NULL, ONIG_OPTION_DEFAULT);
} else {
ret = onig_search(regex->impl, ustr, end, ustr, end, NULL, ONIG_OPTION_DEFAULT);
}
if (ret >= 0) {
*err = 0;
if (flags & BFS_REGEX_ANCHOR) {
return (size_t)ret == len;
} else {
return true;
}
} else if (ret == ONIG_MISMATCH) {
*err = 0;
} else {
*err = ret;
}
return false;
#else
regmatch_t match = {
.rm_so = 0,
.rm_eo = len,
};
int eflags = 0;
#ifdef REG_STARTEND
if (flags & BFS_REGEX_ANCHOR) {
eflags |= REG_STARTEND;
}
#endif
int ret = regexec(®ex->impl, str, 1, &match, eflags);
if (ret == 0) {
*err = 0;
if (flags & BFS_REGEX_ANCHOR) {
return match.rm_so == 0 && (size_t)match.rm_eo == len;
} else {
return true;
}
} else if (ret == REG_NOMATCH) {
*err = 0;
return false;
} else {
*err = ret;
return false;
}
#endif
}
void bfs_regfree(struct bfs_regex *regex) {
if (regex) {
#if BFS_WITH_ONIGURUMA
onig_free(regex->impl);
#else
regfree(®ex->impl);
#endif
free(regex);
}
}
char *bfs_regerror(int err, const struct bfs_regex *regex) {
#if BFS_WITH_ONIGURUMA
unsigned char *str = malloc(ONIG_MAX_ERROR_MESSAGE_LEN);
if (str) {
onig_error_code_to_str(str, err);
}
return (char *)str;
#else
const regex_t *impl = regex ? ®ex->impl : NULL;
size_t len = regerror(err, impl, NULL, 0);
char *str = malloc(len);
if (str) {
regerror(err, impl, str, len);
}
return str;
#endif
}
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