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/* rgxg - ReGular eXpression Generator
*
* Copyright (c) 2013 Hannes von Haugwitz
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you
* must not claim that you wrote the original software. If you use
* this software in a product, an acknowledgment in the product
* documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and
* must not be misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source
* distribution.
*/
#include "rgxg/utils.h"
/* needed for EASY_CHAR */
#include "common_macros.h"
/* needed for strlen */
#include <string.h>
/* needed for NULL */
#include <stdlib.h>
static int rgxg_is_escape_char(char c) {
switch(c) {
case '\\':
case '^':
case '$':
case '*':
case '+':
case '?':
case '.':
case '(':
case ')':
case '|':
case '{':
case '}':
case '[':
case ']':
return 1;
default:
return 0;
}
}
int rgxg_utils_escape_string (const char *src, size_t size,
char *regex, rgxg_options_t options) {
size_t i;
int n = 0;
for (i = 0; i < size && src[i] != '\0'; ++i) {
if (rgxg_is_escape_char(src[i])) {
EASY_CHAR('\\')
}
EASY_CHAR(src[i])
}
if (!(RGXG_NONULLBYTE&options) && regex) { regex[n] = '\0'; }
return n;
}
int rgxg_utils_alternation (const char **patterns, size_t size,
char *regex, rgxg_options_t options) {
int n = 0;
size_t i;
if (size) {
if (!(options&RGXG_NOOUTERPARENS) && size > 1) {
EASY_CHAR('(')
}
for (i = 0; i < size; ++i) {
if (i != 0) {
EASY_CHAR('|')
}
n += rgxg_utils_escape_string(patterns[i], strlen(patterns[i]), (regex ? regex+n : NULL), RGXG_NONULLBYTE);
}
if (!(options&RGXG_NOOUTERPARENS) && size > 1) {
EASY_CHAR(')')
}
}
if (!(RGXG_NONULLBYTE&options) && regex) { regex[n] = '\0'; }
return n;
}
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