56 lines
1005 B
C
56 lines
1005 B
C
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/*
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* randutil.c
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*
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* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
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*
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* $Id: randutil.c 2191 2009-02-01 21:34:27Z aturner $
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*/
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#include "config.h"
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#ifdef HAVE_LIBDNET
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/* need to undef these which are pulled in via defines.h, prior to importing dnet.h */
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#undef icmp_id
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#undef icmp_seq
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#undef icmp_data
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#undef icmp_mask
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#include <dnet.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include "randutil.h"
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static const char base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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void
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rand_strset(rand_t *r, void *buf, size_t len)
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{
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uint32_t u;
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char *p;
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int i;
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p = (char *)buf;
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i = (len + 3) / 4;
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u = rand_uint32(r);
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/* XXX - more Duff's device tomfoolery. */
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switch (len % 4) {
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case 0: do {
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u = rand_uint32(r);
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*p++ = base64[(u >> 18) & 0x3f];
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case 3:
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*p++ = base64[(u >> 12) & 0x3f];
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case 2:
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*p++ = base64[(u >> 6) & 0x3f];
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case 1:
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*p++ = base64[(u >> 0) & 0x3f];
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} while (--i > 0);
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}
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p[-1] = '\0';
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}
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