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authorYang Tse <yangsita@gmail.com>2008-09-11 04:02:49 +0000
committerYang Tse <yangsita@gmail.com>2008-09-11 04:02:49 +0000
commit797372b0f499f35f7cf518543ea3ed281e379d3d (patch)
treeaf14d0dfd82a3f0abb29089252b03930261b2736 /ares_strdup.c
parent2cb5cbba341fb6ee55434d4596c1cae15dbc6f37 (diff)
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strdup() clone for systems/configurations which lack it
Diffstat (limited to 'ares_strdup.c')
-rw-r--r--ares_strdup.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/ares_strdup.c b/ares_strdup.c
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+
+/* $Id$ */
+
+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "setup.h"
+#include "ares_strdup.h"
+
+#ifndef HAVE_STRDUP
+char *ares_strdup(const char *s1)
+{
+ size_t sz;
+ char * s2;
+
+ if(s1) {
+ sz = strlen(s1);
+ if(sz < (size_t)-1) {
+ sz++;
+ if(sz < ((size_t)-1) / sizeof(char)) {
+ s2 = malloc(sz * sizeof(char));
+ if(s2) {
+ memcpy(s2, s1, sz * sizeof(char));
+ return s2;
+ }
+ }
+ }
+ }
+ return (char *)NULL;
+}
+#endif