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