50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "ares_setup.h"
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#include "ares_strdup.h"
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#include "ares.h"
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#include "ares_private.h"
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char *ares_strdup(const char *s1)
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{
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#ifdef HAVE_STRDUP
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if (ares_malloc == malloc)
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return strdup(s1);
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else
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#endif
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{
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size_t sz;
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char * s2;
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if(s1) {
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sz = strlen(s1);
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if(sz < (size_t)-1) {
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sz++;
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if(sz < ((size_t)-1) / sizeof(char)) {
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s2 = ares_malloc(sz * sizeof(char));
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if(s2) {
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memcpy(s2, s1, sz * sizeof(char));
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return s2;
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}
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}
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}
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}
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return (char *)NULL;
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}
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}
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