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ac4d0be587
indent.py `git ls-files | pcregrep '\.[ch]$' | pcregrep -v '^(ldpd|babeld|nhrpd)/'` Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/*
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* Very simple prng to allow for randomized tests with reproducable
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* results.
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*
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* Copyright (C) 2012 by Open Source Routing.
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* Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
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*
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* This file is part of Quagga
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*
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* Quagga is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* Quagga is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Quagga; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <zebra.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include "prng.h"
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struct prng {
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unsigned long long state1;
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unsigned long long state2;
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};
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static char prng_bit(struct prng *prng)
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{
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prng->state1 *= 2416;
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prng->state1 += 374441;
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prng->state1 %= 1771875;
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if (prng->state1 % 2) {
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prng->state2 *= 84589;
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prng->state2 += 45989;
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prng->state2 %= 217728;
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}
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return prng->state2 % 2;
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}
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struct prng *prng_new(unsigned long long seed)
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{
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struct prng *rv = calloc(sizeof(*rv), 1);
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assert(rv);
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rv->state1 = rv->state2 = seed;
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return rv;
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}
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unsigned int prng_rand(struct prng *prng)
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{
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unsigned int i, rv = 0;
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for (i = 0; i < 32; i++) {
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rv |= prng_bit(prng);
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rv <<= 1;
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}
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return rv;
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}
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const char *prng_fuzz(struct prng *prng, const char *string,
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const char *charset, unsigned int operations)
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{
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static char buf[256];
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unsigned int charset_len;
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unsigned int i;
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unsigned int offset;
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unsigned int op;
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unsigned int character;
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assert(strlen(string) < sizeof(buf));
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strncpy(buf, string, sizeof(buf));
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charset_len = strlen(charset);
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for (i = 0; i < operations; i++) {
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offset = prng_rand(prng) % strlen(buf);
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op = prng_rand(prng) % 3;
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switch (op) {
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case 0:
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/* replace */
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character = prng_rand(prng) % charset_len;
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buf[offset] = charset[character];
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break;
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case 1:
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/* remove */
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memmove(buf + offset, buf + offset + 1,
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strlen(buf) - offset);
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break;
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case 2:
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/* insert */
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assert(strlen(buf) + 1 < sizeof(buf));
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memmove(buf + offset + 1, buf + offset,
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strlen(buf) + 1 - offset);
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character = prng_rand(prng) % charset_len;
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buf[offset] = charset[character];
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break;
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}
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}
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return buf;
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}
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void prng_free(struct prng *prng)
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{
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free(prng);
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}
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