1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2013-2016 Xiph.org Foundation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - 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 *
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /* Safe string handling functions to replace things like strcpy, strncpy,
33 * strcat, strncat etc.
34 * All of these functions guarantee a correctly NUL terminated string but
35 * the string may be truncated if the destination buffer was too short.
36 */
37
38 #ifndef FLAC__SHARE_SAFE_STR_H
39 #define FLAC__SHARE_SAFE_STR_H
40
41 static inline char *
safe_strncat(char * dest,const char * src,size_t dest_size)42 safe_strncat(char *dest, const char *src, size_t dest_size)
43 {
44 char * ret;
45
46 if (dest_size < 1)
47 return dest;
48
49 /* Assume dist has space for a term character .. */
50 ret = strncat(dest, src, dest_size - strlen (dest));
51 /* .. but set it explicitly. */
52 dest [dest_size - 1] = 0;
53
54 return ret;
55 }
56
57 static inline char *
safe_strncpy(char * dest,const char * src,size_t dest_size)58 safe_strncpy(char *dest, const char *src, size_t dest_size)
59 {
60 char * ret;
61
62 if (dest_size < 1)
63 return dest;
64
65 ret = strncpy(dest, src, dest_size - 1);
66 dest [dest_size - 1] = 0;
67
68 return ret;
69 }
70
71 #endif /* FLAC__SHARE_SAFE_STR_H */
72