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