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/* 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 "ares_setup.h"
#include "ares_strdup.h"
char *ares_strdup(const char *s1)
size_t sz;
char * s2;
if(s1) {
sz = strlen(s1);
if(sz < (size_t)-1) {
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;
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