1 /* $NetBSD: humanize_number.c,v 1.8 2004/07/27 01:56:24 enami Exp $ */ 2 /* $DragonFly: src/lib/libutil/humanize_number.c,v 1.2 2005/03/04 04:31:11 cpressey 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 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 * 40 * $FreeBSD: /repoman/r/ncvs/src/lib/libutil/humanize_number.c,v 1.1.2.1 2004/09/28 18:24:10 pjd Exp $ 41 */ 42 43 #include <sys/cdefs.h> 44 #include <sys/types.h> 45 46 #include <assert.h> 47 #include <locale.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #include "libutil.h" 53 54 int 55 humanize_number(char *buf, size_t len, int64_t bytes, 56 const char *suffix, int scale, int flags) 57 { 58 const char *prefixes, *sep; 59 int b, i, r, maxscale, s1, s2, sign; 60 int64_t divisor, max; 61 size_t baselen; 62 63 assert(buf != NULL); 64 assert(suffix != NULL); 65 assert(scale >= 0); 66 67 if (flags & HN_DIVISOR_1000) { 68 /* SI for decimal multiplies */ 69 divisor = 1000; 70 if (flags & HN_B) 71 prefixes = "B\0k\0M\0G\0T\0P\0E"; 72 else 73 prefixes = "\0\0k\0M\0G\0T\0P\0E"; 74 } else { 75 /* 76 * binary multiplies 77 * XXX IEC 60027-2 recommends Ki, Mi, Gi... 78 */ 79 divisor = 1024; 80 if (flags & HN_B) 81 prefixes = "B\0K\0M\0G\0T\0P\0E"; 82 else 83 prefixes = "\0\0K\0M\0G\0T\0P\0E"; 84 } 85 86 #define SCALE2PREFIX(scale) (&prefixes[(scale) << 1]) 87 maxscale = 7; 88 89 if (scale >= maxscale && 90 (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0) 91 return (-1); 92 93 if (buf == NULL || suffix == NULL) 94 return (-1); 95 96 if (len > 0) 97 buf[0] = '\0'; 98 if (bytes < 0) { 99 sign = -1; 100 bytes *= -100; 101 baselen = 3; /* sign, digit, prefix */ 102 } else { 103 sign = 1; 104 bytes *= 100; 105 baselen = 2; /* digit, prefix */ 106 } 107 if (flags & HN_NOSPACE) 108 sep = ""; 109 else { 110 sep = " "; 111 baselen++; 112 } 113 baselen += strlen(suffix); 114 115 /* Check if enough room for `x y' + suffix + `\0' */ 116 if (len < baselen + 1) 117 return (-1); 118 119 if (scale & (HN_AUTOSCALE | HN_GETSCALE)) { 120 /* See if there is additional columns can be used. */ 121 for (max = 100, i = len - baselen; i-- > 0;) 122 max *= 10; 123 124 for (i = 0; bytes >= max && i < maxscale; i++) 125 bytes /= divisor; 126 127 if (scale & HN_GETSCALE) 128 return (i); 129 } else 130 for (i = 0; i < scale && i < maxscale; i++) 131 bytes /= divisor; 132 133 /* If a value <= 9.9 after rounding and ... */ 134 if (bytes < 995 && i > 0 && flags & HN_DECIMAL) { 135 /* baselen + \0 + .N */ 136 if (len < baselen + 1 + 2) 137 return (-1); 138 b = ((int)bytes + 5) / 10; 139 s1 = b / 10; 140 s2 = b % 10; 141 r = snprintf(buf, len, "%d%s%d%s%s%s", 142 sign * s1, localeconv()->decimal_point, s2, 143 sep, SCALE2PREFIX(i), suffix); 144 } else 145 r = snprintf(buf, len, "%lld%s%s%s", 146 /* LONGLONG */ 147 (long long)(sign * ((bytes + 50) / 100)), 148 sep, SCALE2PREFIX(i), suffix); 149 150 return (r); 151 } 152