1
2
3 /* Copyright 1998 by the Massachusetts Institute of Technology.
4 *
5 * Permission to use, copy, modify, and distribute this
6 * software and its documentation for any purpose and without
7 * fee is hereby granted, provided that the above copyright
8 * notice appear in all copies and that both that copyright
9 * notice and this permission notice appear in supporting
10 * documentation, and that the name of M.I.T. not be used in
11 * advertising or publicity pertaining to distribution of the
12 * software without specific, written prior permission.
13 * M.I.T. makes no representations about the suitability of
14 * this software for any purpose. It is provided "as is"
15 * without express or implied warranty.
16 */
17
18 #include "ares_setup.h"
19 #include "ares_strdup.h"
20 #include "ares.h"
21 #include "ares_private.h"
22
ares_strdup(const char * s1)23 char *ares_strdup(const char *s1)
24 {
25 size_t sz;
26 char * s2;
27
28 if(s1) {
29 sz = strlen(s1);
30 if(sz < (size_t)-1) {
31 sz++;
32 if(sz < ((size_t)-1)) {
33 s2 = ares_malloc(sz);
34 if(s2) {
35 memcpy(s2, s1, sz);
36 return s2;
37 }
38 }
39 }
40 }
41 return (char *)NULL;
42 }
43