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