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1 office 1 /**
2 * @file concat_strings.h
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Function for concatenating strings.
32 */
33  
34 #ifndef BADVPN_MISC_CONCAT_STRINGS_H
35 #define BADVPN_MISC_CONCAT_STRINGS_H
36  
37 #include <string.h>
38 #include <stdlib.h>
39 #include <stdarg.h>
40  
41 #include <misc/debug.h>
42  
43 static char * concat_strings (int num, ...)
44 {
45 ASSERT(num >= 0)
46  
47 // calculate sum of lengths
48 size_t sum = 0;
49 va_list ap;
50 va_start(ap, num);
51 for (int i = 0; i < num; i++) {
52 const char *str = va_arg(ap, const char *);
53 size_t str_len = strlen(str);
54 if (str_len > SIZE_MAX - 1 - sum) {
55 va_end(ap);
56 return NULL;
57 }
58 sum += str_len;
59 }
60 va_end(ap);
61  
62 // allocate memory
63 char *res_str = (char *)malloc(sum + 1);
64 if (!res_str) {
65 return NULL;
66 }
67  
68 // copy strings
69 sum = 0;
70 va_start(ap, num);
71 for (int i = 0; i < num; i++) {
72 const char *str = va_arg(ap, const char *);
73 size_t str_len = strlen(str);
74 memcpy(res_str + sum, str, str_len);
75 sum += str_len;
76 }
77 va_end(ap);
78  
79 // terminate
80 res_str[sum] = '\0';
81  
82 return res_str;
83 }
84  
85 #endif