102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
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/*
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* ut_sim.c
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*
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* an unreliable transport simulator
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* (for testing replay databases and suchlike)
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright (c) 2001-2017, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "config.h"
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#include "ut_sim.h"
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int ut_compar(const void *a, const void *b)
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{
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return rand() > (RAND_MAX / 2) ? -1 : 1;
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}
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void ut_init(ut_connection *utc)
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{
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int i;
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utc->index = 0;
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for (i = 0; i < UT_BUF; i++)
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utc->buffer[i] = i;
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qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
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utc->index = UT_BUF - 1;
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}
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uint32_t ut_next_index(ut_connection *utc)
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{
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uint32_t tmp;
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tmp = utc->buffer[0];
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utc->index++;
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utc->buffer[0] = utc->index;
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qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar);
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return tmp;
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}
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#ifdef UT_TEST
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#include <stdio.h>
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int main()
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{
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uint32_t i, irecvd, idiff;
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ut_connection utc;
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ut_init(&utc);
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for (i = 0; i < 1000; i++) {
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irecvd = ut_next_index(&utc);
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idiff = i - irecvd;
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printf("%lu\t%lu\t%d\n", i, irecvd, idiff);
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}
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return 0;
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}
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#endif
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