freebsd-dev/contrib/libpam/libpam_misc/xstrdup.c

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/* $Header: /home/morgan/pam/Linux-PAM-0.53/libpam_misc/RCS/xstrdup.c,v 1.4 1996/11/10 20:10:56 morgan Exp $ */
/*
* $Log: xstrdup.c,v $
* Revision 1.4 1996/11/10 20:10:56 morgan
* modification for stack paranoia
*
*/
1998-11-18 01:22:46 +00:00
#include <stdlib.h>
#include <security/pam_misc.h>
/*
* Safe duplication of character strings. "Paranoid"; don't leave
* evidence of old token around for later stack analysis.
*/
char *xstrdup(const char *x)
{
register char *new=NULL;
if (x != NULL) {
register int i;
for (i=0; x[i]; ++i); /* length of string */
if ((new = malloc(++i)) == NULL) {
i = 0;
} else {
while (i-- > 0) {
new[i] = x[i];
}
}
x = NULL;
}
return new; /* return the duplicate or NULL on error */
}