1 /*- 2 * Copyright (c) 2015 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Christos Zoulas. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: h_lfsr.c,v 1.2 2017/06/24 10:25:23 gson Exp $"); 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <fcntl.h> 35 #include <err.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <db.h> 39 40 #define MAXKEY 1000 41 #ifdef DEBUG 42 #define DPRINTF(...) printf(__VA_ARGS__) 43 #else 44 #define DPRINTF(...) 45 #endif 46 47 static uint16_t 48 next(uint16_t *cur) 49 { 50 uint16_t lsb = *cur & 1; 51 *cur >>= 1; 52 *cur ^= (-lsb) & 0xB400u; 53 return *cur; 54 } 55 56 int 57 main(int argc, char *argv[]) 58 { 59 char buf[65536]; 60 char kb[256]; 61 DBT key, val; 62 DB *db; 63 HASHINFO hi; 64 uint8_t c; 65 uint16_t len; 66 uint32_t pagesize = atoi(argv[1]); 67 68 memset(&hi, 0, sizeof(hi)); 69 memset(buf, 'a', sizeof(buf)); 70 hi.bsize = pagesize; 71 hi.nelem = 65536; 72 hi.ffactor = 128; 73 74 key.data = kb; 75 val.data = buf; 76 77 db = dbopen(NULL, O_CREAT|O_TRUNC|O_RDWR, 0, DB_HASH, &hi); 78 if (db == NULL) 79 err(EXIT_FAILURE, "dbopen"); 80 81 len = 0xaec1; 82 for (size_t i = 0; i < MAXKEY; i++) { 83 key.size = (len & 0xff) + 1; 84 c = len >> 8; 85 memset(kb, c, key.size); 86 val.size = (next(&len) & 0xff) + 1; 87 switch ((*db->put)(db, &key, &val, R_NOOVERWRITE)) { 88 case 0: 89 DPRINTF("put %zu %zu %#x\n", 90 key.size, val.size, c); 91 break; 92 case -1: 93 err(EXIT_FAILURE, "put error %zu %zu %#x", 94 key.size, val.size, c); 95 case 1: 96 errx(EXIT_FAILURE, "put overwrite %zu %zu %#x", 97 key.size, val.size, c); 98 default: 99 abort(); 100 } 101 } 102 103 len = 0xaec1; 104 for (size_t i = 0; i < MAXKEY; i++) { 105 key.size = (len & 0xff) + 1; 106 c = len >> 8; 107 memset(kb, c, key.size); 108 next(&len); 109 switch ((*db->get)(db, &key, &val, 0)) { 110 case 0: 111 DPRINTF("get %zu %zu %#x\n", 112 key.size, val.size, c); 113 break; 114 case -1: 115 err(EXIT_FAILURE, "get %zu %zu %#x", 116 key.size, val.size, c); 117 case 1: 118 errx(EXIT_FAILURE, "get not found %zu %zu %#x", 119 key.size, val.size, c); 120 default: 121 abort(); 122 } 123 if (memcmp(key.data, kb, key.size) != 0) 124 errx(EXIT_FAILURE, "get badkey %zu %zu %#x", 125 key.size, val.size, c); 126 if (val.size != (len & 0xff) + 1U) 127 errx(EXIT_FAILURE, "get badvallen %zu %zu %#x", 128 key.size, val.size, c); 129 if (memcmp(val.data, buf, val.size) != 0) 130 errx(EXIT_FAILURE, "get badval %zu %zu %#x", 131 key.size, val.size, c); 132 } 133 134 len = 0xaec1; 135 for (size_t i = 0; i < MAXKEY; i++) { 136 key.size = (len & 0xff) + 1; 137 c = len >> 8; 138 memset(kb, c, key.size); 139 next(&len); 140 switch ((*db->del)(db, &key, 0)) { 141 case 0: 142 DPRINTF("del %zu %zu %#x\n", 143 key.size, val.size, c); 144 break; 145 case -1: 146 err(EXIT_FAILURE, "del %zu %zu %#x", key.size, 147 val.size, c); 148 case 1: 149 errx(EXIT_FAILURE, "del not found %zu %zu %#x", 150 key.size, val.size, c); 151 default: 152 abort(); 153 } 154 } 155 156 len = 0xaec1; 157 for (size_t i = 0; i < MAXKEY; i++) { 158 key.size = (len & 0xff) + 1; 159 c = len >> 8; 160 memset(kb, c, key.size); 161 next(&len); 162 switch ((*db->get)(db, &key, &val, 0)) { 163 case 0: 164 errx(EXIT_FAILURE, "get2 found %zu %zu %#x", 165 key.size, val.size, c); 166 break; 167 case -1: 168 err(EXIT_FAILURE, "get2 %zu %zu %#x", 169 key.size, val.size, c); 170 case 1: 171 DPRINTF("get2 %zu %zu %#x\n", 172 key.size, val.size, c); 173 break; 174 default: 175 abort(); 176 } 177 } 178 return 0; 179 } 180
Indexes created Sat Sep 20 22:09:52 GMT 2025