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1 /* | |
2 * ut_sim.c | |
3 * | |
4 * an unreliable transport simulator | |
5 * (for testing replay databases and suchlike) | |
6 * | |
7 * David A. McGrew | |
8 * Cisco Systems, Inc. | |
9 */ | |
10 | |
11 /* | |
12 * | |
13 * Copyright (c) 2001-2006, Cisco Systems, Inc. | |
14 * All rights reserved. | |
15 * | |
16 * Redistribution and use in source and binary forms, with or without | |
17 * modification, are permitted provided that the following conditions | |
18 * are met: | |
19 * | |
20 * Redistributions of source code must retain the above copyright | |
21 * notice, this list of conditions and the following disclaimer. | |
22 * | |
23 * Redistributions in binary form must reproduce the above | |
24 * copyright notice, this list of conditions and the following | |
25 * disclaimer in the documentation and/or other materials provided | |
26 * with the distribution. | |
27 * | |
28 * Neither the name of the Cisco Systems, Inc. nor the names of its | |
29 * contributors may be used to endorse or promote products derived | |
30 * from this software without specific prior written permission. | |
31 * | |
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
36 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
43 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
44 * | |
45 */ | |
46 | |
47 | |
48 #ifdef HAVE_CONFIG_H | |
49 #include <config.h> | |
50 #endif | |
51 | |
52 #include "ut_sim.h" | |
53 | |
54 | |
55 int | |
56 ut_compar(const void *a, const void *b) { | |
57 return rand() > (RAND_MAX/2) ? -1 : 1; | |
58 } | |
59 | |
60 void | |
61 ut_init(ut_connection *utc) { | |
62 int i; | |
63 utc->index = 0; | |
64 | |
65 for (i=0; i < UT_BUF; i++) | |
66 utc->buffer[i] = i; | |
67 | |
68 qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar); | |
69 | |
70 utc->index = UT_BUF - 1; | |
71 } | |
72 | |
73 uint32_t | |
74 ut_next_index(ut_connection *utc) { | |
75 uint32_t tmp; | |
76 | |
77 tmp = utc->buffer[0]; | |
78 utc->index++; | |
79 utc->buffer[0] = utc->index; | |
80 | |
81 qsort(utc->buffer, UT_BUF, sizeof(uint32_t), ut_compar); | |
82 | |
83 return tmp; | |
84 } | |
85 | |
86 | |
87 | |
88 #ifdef UT_TEST | |
89 | |
90 #include <stdio.h> | |
91 | |
92 int | |
93 main() { | |
94 uint32_t i, irecvd, idiff; | |
95 ut_connection utc; | |
96 | |
97 ut_init(&utc); | |
98 | |
99 for (i=0; i < 1000; i++) { | |
100 irecvd = ut_next_index(&utc); | |
101 idiff = i - irecvd; | |
102 printf("%lu\t%lu\t%d\n", i, irecvd, idiff); | |
103 } | |
104 | |
105 return 0; | |
106 } | |
107 | |
108 | |
109 #endif | |
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