1 /* $NetBSD: humanize_number.c,v 1.14 2008/04/28 20:22:59 martin Exp $ */ 2 /* $DragonFly: src/lib/libutil/humanize_number.c,v 1.3 2008/08/04 19:09:26 swildner Exp $ */ 3 4 /* 5 * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 10 * NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libutil/humanize_number.c,v 1.3 2008/03/08 21:55:59 antoine Exp $ 34 */ 35 36 #include <sys/types.h> 37 #include <assert.h> 38 #include <inttypes.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <locale.h> 43 44 #include "libutil.h" 45 46 int 47 humanize_number(char *buf, size_t len, int64_t bytes, 48 const char *suffix, int scale, int flags) 49 { 50 const char *prefixes, *sep; 51 int b, i, r, maxscale, s1, s2, sign; 52 int64_t divisor, max; 53 size_t baselen; 54 55 assert(buf != NULL); 56 assert(suffix != NULL); 57 assert(scale >= 0); 58 59 if (flags & HN_DIVISOR_1000) { 60 /* SI for decimal multiplies */ 61 divisor = 1000; 62 if (flags & HN_B) 63 prefixes = "B\0k\0M\0G\0T\0P\0E"; 64 else 65 prefixes = "\0\0k\0M\0G\0T\0P\0E"; 66 } else { 67 /* 68 * binary multiplies 69 * XXX IEC 60027-2 recommends Ki, Mi, Gi... 70 */ 71 divisor = 1024; 72 if (flags & HN_B) 73 prefixes = "B\0K\0M\0G\0T\0P\0E"; 74 else 75 prefixes = "\0\0K\0M\0G\0T\0P\0E"; 76 } 77 78 #define SCALE2PREFIX(scale) (&prefixes[(scale) << 1]) 79 maxscale = 7; 80 81 if (scale >= maxscale && 82 (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0) 83 return (-1); 84 85 if (buf == NULL || suffix == NULL) 86 return (-1); 87 88 if (len > 0) 89 buf[0] = '\0'; 90 if (bytes < 0) { 91 sign = -1; 92 bytes *= -100; 93 baselen = 3; /* sign, digit, prefix */ 94 } else { 95 sign = 1; 96 bytes *= 100; 97 baselen = 2; /* digit, prefix */ 98 } 99 if (flags & HN_NOSPACE) 100 sep = ""; 101 else { 102 sep = " "; 103 baselen++; 104 } 105 baselen += strlen(suffix); 106 107 /* Check if enough room for `x y' + suffix + `\0' */ 108 if (len < baselen + 1) 109 return (-1); 110 111 if (scale & (HN_AUTOSCALE | HN_GETSCALE)) { 112 /* See if there is additional columns can be used. */ 113 for (max = 100, i = len - baselen; i-- > 0;) 114 max *= 10; 115 116 /* 117 * Divide the number until it fits the given column. 118 * If there will be an overflow by the rounding below, 119 * divide once more. 120 */ 121 for (i = 0; bytes >= max - 50 && i < maxscale; i++) 122 bytes /= divisor; 123 124 if (scale & HN_GETSCALE) 125 return (i); 126 } else 127 for (i = 0; i < scale && i < maxscale; i++) 128 bytes /= divisor; 129 130 /* If a value <= 9.9 after rounding and ... */ 131 if (bytes < 995 && i > 0 && flags & HN_DECIMAL) { 132 /* baselen + \0 + .N */ 133 if (len < baselen + 1 + 2) 134 return (-1); 135 b = ((int)bytes + 5) / 10; 136 s1 = b / 10; 137 s2 = b % 10; 138 r = snprintf(buf, len, "%d%s%d%s%s%s", 139 sign * s1, localeconv()->decimal_point, s2, 140 sep, SCALE2PREFIX(i), suffix); 141 } else 142 r = snprintf(buf, len, "%" PRId64 "%s%s%s", 143 sign * ((bytes + 50) / 100), 144 sep, SCALE2PREFIX(i), suffix); 145 146 return (r); 147 } 148