convtbl.c revision 1.2.2.2
1 1.2.2.2 pgoyette /* $NetBSD: convtbl.c,v 1.2.2.2 2016/08/06 00:19:12 pgoyette Exp $ */ 2 1.2.2.2 pgoyette 3 1.2.2.2 pgoyette /* 4 1.2.2.2 pgoyette * Copyright (c) 2003, Trent Nelson, <trent (at) arpa.com>. 5 1.2.2.2 pgoyette * All rights reserved. 6 1.2.2.2 pgoyette * 7 1.2.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.2.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.2.2.2 pgoyette * are met: 10 1.2.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.2.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.2.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.2.2.2 pgoyette * 3. The name of the author may not be used to endorse or promote products 16 1.2.2.2 pgoyette * derived from this software without specific prior written permission. 17 1.2.2.2 pgoyette * 18 1.2.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 1.2.2.2 pgoyette * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 1.2.2.2 pgoyette * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 1.2.2.2 pgoyette * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 1.2.2.2 pgoyette * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.2.2.2 pgoyette * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 1.2.2.2 pgoyette * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.2.2.2 pgoyette * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.2.2.2 pgoyette * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.2.2.2 pgoyette * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.2.2.2 pgoyette * SUCH DAMAGE. 29 1.2.2.2 pgoyette * 30 1.2.2.2 pgoyette * $FreeBSD: releng/10.1/usr.bin/systat/convtbl.c 175387 2008-01-16 19:27:43Z delphij $ 31 1.2.2.2 pgoyette */ 32 1.2.2.2 pgoyette 33 1.2.2.2 pgoyette #include <sys/cdefs.h> 34 1.2.2.2 pgoyette #ifndef lint 35 1.2.2.2 pgoyette __RCSID("$NetBSD: convtbl.c,v 1.2.2.2 2016/08/06 00:19:12 pgoyette Exp $"); 36 1.2.2.2 pgoyette #endif /* not lint */ 37 1.2.2.2 pgoyette 38 1.2.2.2 pgoyette #include <sys/types.h> 39 1.2.2.2 pgoyette 40 1.2.2.2 pgoyette #include <stdlib.h> 41 1.2.2.2 pgoyette #include <string.h> 42 1.2.2.2 pgoyette 43 1.2.2.2 pgoyette #include "convtbl.h" 44 1.2.2.2 pgoyette 45 1.2.2.2 pgoyette #define BIT (8) 46 1.2.2.2 pgoyette #define BITS (1) 47 1.2.2.2 pgoyette #define KILOBIT (1000LL) 48 1.2.2.2 pgoyette #define MEGABIT (KILOBIT * 1000) 49 1.2.2.2 pgoyette #define GIGABIT (MEGABIT * 1000) 50 1.2.2.2 pgoyette #define TERABIT (GIGABIT * 1000) 51 1.2.2.2 pgoyette 52 1.2.2.2 pgoyette #define BYTE (1) 53 1.2.2.2 pgoyette #define BYTES (1) 54 1.2.2.2 pgoyette #define KILOBYTE (1024LL) 55 1.2.2.2 pgoyette #define MEGABYTE (KILOBYTE * 1024) 56 1.2.2.2 pgoyette #define GIGABYTE (MEGABYTE * 1024) 57 1.2.2.2 pgoyette #define TERABYTE (GIGABYTE * 1024) 58 1.2.2.2 pgoyette 59 1.2.2.2 pgoyette struct convtbl { 60 1.2.2.2 pgoyette uintmax_t mul; 61 1.2.2.2 pgoyette uintmax_t scale; 62 1.2.2.2 pgoyette const char *str; 63 1.2.2.2 pgoyette const char *name; 64 1.2.2.2 pgoyette }; 65 1.2.2.2 pgoyette 66 1.2.2.2 pgoyette static struct convtbl convtbl[] = { 67 1.2.2.2 pgoyette /* mul, scale, str, name */ 68 1.2.2.2 pgoyette [SC_BYTE] = { BYTE, BYTES, "B", "byte" }, 69 1.2.2.2 pgoyette [SC_KILOBYTE] = { BYTE, KILOBYTE, "KB", "kbyte" }, 70 1.2.2.2 pgoyette [SC_MEGABYTE] = { BYTE, MEGABYTE, "MB", "mbyte" }, 71 1.2.2.2 pgoyette [SC_GIGABYTE] = { BYTE, GIGABYTE, "GB", "gbyte" }, 72 1.2.2.2 pgoyette [SC_TERABYTE] = { BYTE, TERABYTE, "TB", "tbyte" }, 73 1.2.2.2 pgoyette 74 1.2.2.2 pgoyette [SC_BIT] = { BIT, BITS, "b", "bit" }, 75 1.2.2.2 pgoyette [SC_KILOBIT] = { BIT, KILOBIT, "Kb", "kbit" }, 76 1.2.2.2 pgoyette [SC_MEGABIT] = { BIT, MEGABIT, "Mb", "mbit" }, 77 1.2.2.2 pgoyette [SC_GIGABIT] = { BIT, GIGABIT, "Gb", "gbit" }, 78 1.2.2.2 pgoyette [SC_TERABIT] = { BIT, TERABIT, "Tb", "tbit" }, 79 1.2.2.2 pgoyette 80 1.2.2.2 pgoyette [SC_AUTO] = { 0, 0, "", "auto" } 81 1.2.2.2 pgoyette }; 82 1.2.2.2 pgoyette 83 1.2.2.2 pgoyette static 84 1.2.2.2 pgoyette struct convtbl * 85 1.2.2.2 pgoyette get_tbl_ptr(const uintmax_t size, const int scale) 86 1.2.2.2 pgoyette { 87 1.2.2.2 pgoyette uintmax_t tmp; 88 1.2.2.2 pgoyette int idx; 89 1.2.2.2 pgoyette 90 1.2.2.2 pgoyette /* If our index is out of range, default to auto-scaling. */ 91 1.2.2.2 pgoyette idx = scale < SC_AUTO ? scale : SC_AUTO; 92 1.2.2.2 pgoyette 93 1.2.2.2 pgoyette if (idx == SC_AUTO) 94 1.2.2.2 pgoyette /* 95 1.2.2.2 pgoyette * Simple but elegant algorithm. Count how many times 96 1.2.2.2 pgoyette * we can shift our size value right by a factor of ten, 97 1.2.2.2 pgoyette * incrementing an index each time. We then use the 98 1.2.2.2 pgoyette * index as the array index into the conversion table. 99 1.2.2.2 pgoyette */ 100 1.2.2.2 pgoyette for (tmp = size, idx = SC_KILOBYTE; 101 1.2.2.2 pgoyette tmp >= MEGABYTE && idx < SC_BIT - 1; 102 1.2.2.2 pgoyette tmp >>= 10, idx++); 103 1.2.2.2 pgoyette 104 1.2.2.2 pgoyette return (&convtbl[idx]); 105 1.2.2.2 pgoyette } 106 1.2.2.2 pgoyette 107 1.2.2.2 pgoyette double 108 1.2.2.2 pgoyette convert(const uintmax_t size, const int scale) 109 1.2.2.2 pgoyette { 110 1.2.2.2 pgoyette struct convtbl *tp; 111 1.2.2.2 pgoyette 112 1.2.2.2 pgoyette tp = get_tbl_ptr(size, scale); 113 1.2.2.2 pgoyette return ((double)size * tp->mul / tp->scale); 114 1.2.2.2 pgoyette 115 1.2.2.2 pgoyette } 116 1.2.2.2 pgoyette 117 1.2.2.2 pgoyette const char * 118 1.2.2.2 pgoyette get_string(const uintmax_t size, const int scale) 119 1.2.2.2 pgoyette { 120 1.2.2.2 pgoyette struct convtbl *tp; 121 1.2.2.2 pgoyette 122 1.2.2.2 pgoyette tp = get_tbl_ptr(size, scale); 123 1.2.2.2 pgoyette return (tp->str); 124 1.2.2.2 pgoyette } 125 1.2.2.2 pgoyette 126 1.2.2.2 pgoyette int 127 1.2.2.2 pgoyette get_scale(const char *name) 128 1.2.2.2 pgoyette { 129 1.2.2.2 pgoyette int i; 130 1.2.2.2 pgoyette 131 1.2.2.2 pgoyette for (i = 0; i <= SC_AUTO; i++) 132 1.2.2.2 pgoyette if (strcmp(convtbl[i].name, name) == 0) 133 1.2.2.2 pgoyette return (i); 134 1.2.2.2 pgoyette return (-1); 135 1.2.2.2 pgoyette } 136 1.2.2.2 pgoyette 137 1.2.2.2 pgoyette const char * 138 1.2.2.2 pgoyette get_helplist(void) 139 1.2.2.2 pgoyette { 140 1.2.2.2 pgoyette int i; 141 1.2.2.2 pgoyette size_t len; 142 1.2.2.2 pgoyette static char *buf; 143 1.2.2.2 pgoyette 144 1.2.2.2 pgoyette if (buf == NULL) { 145 1.2.2.2 pgoyette len = 0; 146 1.2.2.2 pgoyette for (i = 0; i <= SC_AUTO; i++) 147 1.2.2.2 pgoyette len += strlen(convtbl[i].name) + 2; 148 1.2.2.2 pgoyette if ((buf = malloc(len)) != NULL) { 149 1.2.2.2 pgoyette buf[0] = '\0'; 150 1.2.2.2 pgoyette for (i = 0; i <= SC_AUTO; i++) { 151 1.2.2.2 pgoyette strcat(buf, convtbl[i].name); 152 1.2.2.2 pgoyette if (i < SC_AUTO) 153 1.2.2.2 pgoyette strcat(buf, ", "); 154 1.2.2.2 pgoyette } 155 1.2.2.2 pgoyette } else 156 1.2.2.2 pgoyette return (""); 157 1.2.2.2 pgoyette } 158 1.2.2.2 pgoyette return (buf); 159 1.2.2.2 pgoyette } 160
Indexes created Tue Oct 21 08:09:48 GMT 2025