src/fragroute/randutil.c
/*
* randutil.c
*
* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
*
* $Id$
*/
#include "config.h"
#ifdef HAVE_LIBDNET
/* need to undef these which are pulled in via defines.h, prior to importing dnet.h */
#undef icmp_id
#undef icmp_seq
#undef icmp_data
#undef icmp_mask
#ifdef HAVE_DNET_H
#include <dnet.h>
#endif
#ifdef HAVE_DUMBNET_H
#include <dumbnet.h>
#endif
#endif
#include "randutil.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
void
rand_strset(rand_t *r, void *buf, size_t len)
{
uint32_t u;
char *p;
int i;
p = (char *)buf;
i = (len + 3) / 4;
u = rand_uint32(r);
/* XXX - more Duff's device tomfoolery. */
switch (len % 4) {
case 0:
do {
u = rand_uint32(r);
*p++ = base64[(u >> 18) & 0x3f];
/* fall through */
case 3:
*p++ = base64[(u >> 12) & 0x3f];
/* fall through */
case 2:
*p++ = base64[(u >> 6) & 0x3f];
/* fall through */
case 1:
*p++ = base64[(u >> 0) & 0x3f];
} while (--i > 0);
}
p[-1] = '\0';
}