86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/**
|
|
* @file concat_strings.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 concatenating strings.
|
|
*/
|
|
|
|
#ifndef BADVPN_MISC_CONCAT_STRINGS_H
|
|
#define BADVPN_MISC_CONCAT_STRINGS_H
|
|
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
|
|
#include <misc/debug.h>
|
|
|
|
static char * concat_strings (int num, ...)
|
|
{
|
|
ASSERT(num >= 0)
|
|
|
|
// calculate sum of lengths
|
|
size_t sum = 0;
|
|
va_list ap;
|
|
va_start(ap, num);
|
|
for (int i = 0; i < num; i++) {
|
|
const char *str = va_arg(ap, const char *);
|
|
size_t str_len = strlen(str);
|
|
if (str_len > SIZE_MAX - 1 - sum) {
|
|
va_end(ap);
|
|
return NULL;
|
|
}
|
|
sum += str_len;
|
|
}
|
|
va_end(ap);
|
|
|
|
// allocate memory
|
|
char *res_str = (char *)malloc(sum + 1);
|
|
if (!res_str) {
|
|
return NULL;
|
|
}
|
|
|
|
// copy strings
|
|
sum = 0;
|
|
va_start(ap, num);
|
|
for (int i = 0; i < num; i++) {
|
|
const char *str = va_arg(ap, const char *);
|
|
size_t str_len = strlen(str);
|
|
memcpy(res_str + sum, str, str_len);
|
|
sum += str_len;
|
|
}
|
|
va_end(ap);
|
|
|
|
// terminate
|
|
res_str[sum] = '\0';
|
|
|
|
return res_str;
|
|
}
|
|
|
|
#endif
|