1 /* $NetBSD: humanize_number.c,v 1.10 2005/09/13 01:44:09 christos 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 #if defined(LIBC_SCCS) && !defined(lint) 42 __RCSID("$NetBSD: humanize_number.c,v 1.10 2005/09/13 01:44:09 christos Exp $"); 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <assert.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <locale.h> 51 #include <util.h> 52 53 int 54 humanize_number(char *buf, size_t len, int64_t bytes, 55 const char *suffix, int scale, int flags) 56 { 57 const char *prefixes, *sep; 58 int b, i, r, maxscale, s1, s2, sign; 59 int64_t divisor, max; 60 size_t baselen; 61 62 _DIAGASSERT(buf != NULL); 63 _DIAGASSERT(suffix != NULL); 64 _DIAGASSERT(scale >= 0); 65 66 if (flags & HN_DIVISOR_1000) { 67 /* SI for decimal multiplies */ 68 divisor = 1000; 69 if (flags & HN_B) 70 prefixes = "B\0k\0M\0G\0T\0P\0E"; 71 else 72 prefixes = "\0\0k\0M\0G\0T\0P\0E"; 73 } else { 74 /* 75 * binary multiplies 76 * XXX IEC 60027-2 recommends Ki, Mi, Gi... 77 */ 78 divisor = 1024; 79 if (flags & HN_B) 80 prefixes = "B\0K\0M\0G\0T\0P\0E"; 81 else 82 prefixes = "\0\0K\0M\0G\0T\0P\0E"; 83 } 84 85 #define SCALE2PREFIX(scale) (&prefixes[(scale) << 1]) 86 maxscale = 7; 87 88 if (scale >= maxscale && 89 (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0) 90 return (-1); 91 92 if (buf == NULL || suffix == NULL) 93 return (-1); 94 95 if (len > 0) 96 buf[0] = '\0'; 97 if (bytes < 0) { 98 sign = -1; 99 bytes *= -100; 100 baselen = 3; /* sign, digit, prefix */ 101 } else { 102 sign = 1; 103 bytes *= 100; 104 baselen = 2; /* digit, prefix */ 105 } 106 if (flags & HN_NOSPACE) 107 sep = ""; 108 else { 109 sep = " "; 110 baselen++; 111 } 112 baselen += strlen(suffix); 113 114 /* Check if enough room for `x y' + suffix + `\0' */ 115 if (len < baselen + 1) 116 return (-1); 117 118 if (scale & (HN_AUTOSCALE | HN_GETSCALE)) { 119 /* See if there is additional columns can be used. */ 120 for (max = 100, i = len - baselen; i-- > 0;) 121 max *= 10; 122 123 for (i = 0; bytes >= max && i < maxscale; i++) 124 bytes /= divisor; 125 126 if (scale & HN_GETSCALE) 127 return (i); 128 } else 129 for (i = 0; i < scale && i < maxscale; i++) 130 bytes /= divisor; 131 132 /* If a value <= 9.9 after rounding and ... */ 133 if (bytes < 995 && i > 0 && flags & HN_DECIMAL) { 134 /* baselen + \0 + .N */ 135 if (len < baselen + 1 + 2) 136 return (-1); 137 b = ((int)bytes + 5) / 10; 138 s1 = b / 10; 139 s2 = b % 10; 140 r = snprintf(buf, len, "%d%s%d%s%s%s", 141 sign * s1, localeconv()->decimal_point, s2, 142 sep, SCALE2PREFIX(i), suffix); 143 } else 144 r = snprintf(buf, len, "%lld%s%s%s", 145 /* LONGLONG */ 146 (long long)(sign * ((bytes + 50) / 100)), 147 sep, SCALE2PREFIX(i), suffix); 148 149 return (r); 150 } 151