97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/**
|
|
* @file string_begins_with.h
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
|
*
|
|
* @section LICENSE
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* @section DESCRIPTION
|
|
*
|
|
* Function for checking if a string begins with a given string.
|
|
*/
|
|
|
|
#ifndef BADVPN_MISC_STRING_BEGINS_WITH
|
|
#define BADVPN_MISC_STRING_BEGINS_WITH
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
|
|
#include <misc/debug.h>
|
|
|
|
static size_t data_begins_with (const char *str, size_t str_len, const char *needle)
|
|
{
|
|
ASSERT(strlen(needle) > 0)
|
|
|
|
size_t len = 0;
|
|
|
|
while (str_len > 0 && *needle) {
|
|
if (*str != *needle) {
|
|
return 0;
|
|
}
|
|
str++;
|
|
str_len--;
|
|
needle++;
|
|
len++;
|
|
}
|
|
|
|
if (*needle) {
|
|
return 0;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static size_t string_begins_with (const char *str, const char *needle)
|
|
{
|
|
ASSERT(strlen(needle) > 0)
|
|
|
|
return data_begins_with(str, strlen(str), needle);
|
|
}
|
|
|
|
static size_t data_begins_with_bin (const char *str, size_t str_len, const char *needle, size_t needle_len)
|
|
{
|
|
ASSERT(needle_len > 0)
|
|
|
|
size_t len = 0;
|
|
|
|
while (str_len > 0 && needle_len > 0) {
|
|
if (*str != *needle) {
|
|
return 0;
|
|
}
|
|
str++;
|
|
str_len--;
|
|
needle++;
|
|
needle_len--;
|
|
len++;
|
|
}
|
|
|
|
if (needle_len > 0) {
|
|
return 0;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
#endif
|