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From: lcc.jbrown@ucla-locus.arpa (Jordan Brown)
Newsgroups: net.unix
Subject: strdup
Message-ID: <3325@brl-smoke.ARPA>
Date: Tue, 26-Aug-86 14:38:19 EDT
Article-I.D.: brl-smok.3325
Posted: Tue Aug 26 14:38:19 1986
Date-Received: Wed, 27-Aug-86 20:54:07 EDT
Sender: news@brl-smoke.ARPA
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/* the following code is in the public domain.  I have never seen */
/* the original UNIX code for this function. */
/* hjb 08/25/86 */

char *
strdup(s)
char *s;
{
	char *p;
	extern char *malloc();

	if(p=malloc(strlen(s)+1))
		strcpy(p,s);
	return p;
}

I am not sure, but I think that strdup comes from MicroSoft, and is only
present under XENIX and their MSDOS C compiler.  It's a useful function,
though, and everybody should have it.