1 /* $NetBSD: humanize_number.c,v 1.9 2005/02/09 21:35:46 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center, by Luke Mewburn and by Tomas Svensson. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 #ifndef __lint 42 __COPYRIGHT("@(#) Copyright (c) 2002\n\ 43 The NetBSD Foundation, inc. All rights reserved.\n"); 44 __RCSID("$NetBSD: humanize_number.c,v 1.9 2005/02/09 21:35:46 kleink Exp $"); 45 #endif /* !__lint */ 46 47 #include "namespace.h" 48 #include <assert.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <locale.h> 53 #include <util.h> 54 55 int 56 humanize_number(char *buf, size_t len, int64_t bytes, 57 const char *suffix, int scale, int flags) 58 { 59 const char *prefixes, *sep; 60 int b, i, r, maxscale, s1, s2, sign; 61 int64_t divisor, max; 62 size_t baselen; 63 64 _DIAGASSERT(buf != NULL); 65 _DIAGASSERT(suffix != NULL); 66 _DIAGASSERT(scale >= 0); 67 68 if (flags & HN_DIVISOR_1000) { 69 /* SI for decimal multiplies */ 70 divisor = 1000; 71 if (flags & HN_B) 72 prefixes = "B\0k\0M\0G\0T\0P\0E"; 73 else 74 prefixes = "\0\0k\0M\0G\0T\0P\0E"; 75 } else { 76 /* 77 * binary multiplies 78 * XXX IEC 60027-2 recommends Ki, Mi, Gi... 79 */ 80 divisor = 1024; 81 if (flags & HN_B) 82 prefixes = "B\0K\0M\0G\0T\0P\0E"; 83 else 84 prefixes = "\0\0K\0M\0G\0T\0P\0E"; 85 } 86 87 #define SCALE2PREFIX(scale) (&prefixes[(scale) << 1]) 88 maxscale = 7; 89 90 if (scale >= maxscale && 91 (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0) 92 return (-1); 93 94 if (buf == NULL || suffix == NULL) 95 return (-1); 96 97 if (len > 0) 98 buf[0] = '\0'; 99 if (bytes < 0) { 100 sign = -1; 101 bytes *= -100; 102 baselen = 3; /* sign, digit, prefix */ 103 } else { 104 sign = 1; 105 bytes *= 100; 106 baselen = 2; /* digit, prefix */ 107 } 108 if (flags & HN_NOSPACE) 109 sep = ""; 110 else { 111 sep = " "; 112 baselen++; 113 } 114 baselen += strlen(suffix); 115 116 /* Check if enough room for `x y' + suffix + `\0' */ 117 if (len < baselen + 1) 118 return (-1); 119 120 if (scale & (HN_AUTOSCALE | HN_GETSCALE)) { 121 /* See if there is additional columns can be used. */ 122 for (max = 100, i = len - baselen; i-- > 0;) 123 max *= 10; 124 125 for (i = 0; bytes >= max && i < maxscale; i++) 126 bytes /= divisor; 127 128 if (scale & HN_GETSCALE) 129 return (i); 130 } else 131 for (i = 0; i < scale && i < maxscale; i++) 132 bytes /= divisor; 133 134 /* If a value <= 9.9 after rounding and ... */ 135 if (bytes < 995 && i > 0 && flags & HN_DECIMAL) { 136 /* baselen + \0 + .N */ 137 if (len < baselen + 1 + 2) 138 return (-1); 139 b = ((int)bytes + 5) / 10; 140 s1 = b / 10; 141 s2 = b % 10; 142 r = snprintf(buf, len, "%d%s%d%s%s%s", 143 sign * s1, localeconv()->decimal_point, s2, 144 sep, SCALE2PREFIX(i), suffix); 145 } else 146 r = snprintf(buf, len, "%lld%s%s%s", 147 /* LONGLONG */ 148 (long long)(sign * ((bytes + 50) / 100)), 149 sep, SCALE2PREFIX(i), suffix); 150 151 return (r); 152 } 153