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
21 #ifndef HAVE_STRDUP
ares_strdup(const char * s1)22 char *ares_strdup(const char *s1)
23 {
24 size_t sz;
25 char * s2;
26
27 if(s1) {
28 sz = strlen(s1);
29 if(sz < (size_t)-1) {
30 sz++;
31 if(sz < ((size_t)-1) / sizeof(char)) {
32 s2 = malloc(sz * sizeof(char));
33 if(s2) {
34 memcpy(s2, s1, sz * sizeof(char));
35 return s2;
36 }
37 }
38 }
39 }
40 return (char *)NULL;
41 }
42 #endif
43