1 /* $NetBSD: humanize_number.c,v 1.3 2002/09/27 18:37:45 drochner 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 1.3 2002/09/27 18:37:45 drochner Exp $"); 45 #endif /* !__lint */ 46 47 #include <assert.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <locale.h> 52 #include <util.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; 59 int i, r; 60 int64_t divisor, max, s1, s2, sign; 61 size_t baselen, suffixlen; 62 63 _DIAGASSERT(buf != NULL); 64 _DIAGASSERT(suffix != NULL); 65 66 if (flags & HN_DIVISOR_1000) { 67 /* SI for decimal multiplies */ 68 divisor = 1000; 69 prefixes = " kMGTPE"; 70 } else { 71 /* 72 * binary multiplies 73 * XXX IEC 60027-2 recommends Ki, Mi, Gi... 74 */ 75 divisor = 1024; 76 prefixes = " KMGTPE"; 77 } 78 79 if (scale >= strlen(prefixes) && scale != HN_AUTOSCALE && 80 scale != HN_GETSCALE) 81 return (-1); 82 83 if (buf == NULL || suffix == NULL) 84 return (-1); 85 86 if (len > 0) 87 buf[0] = '\0'; 88 if (bytes < 0) { 89 sign = -1; 90 bytes *= -100; 91 baselen = 4; 92 } else { 93 sign = 1; 94 bytes *= 100; 95 baselen = 3; 96 } 97 98 suffixlen = strlen(suffix); 99 100 /* check if enough room for `x y' + suffix + `\0' */ 101 if (len < baselen + suffixlen + 1) 102 return (-1); 103 104 if (flags & HN_DIVISOR_1000) 105 divisor = 1000; 106 else 107 divisor = 1024; 108 109 max = 100; 110 for (i = 0; i < len - suffixlen - baselen + ((flags & HN_NOSPACE) ? 111 1 : 0); i++) 112 max *= 10; 113 114 if ((scale & HN_AUTOSCALE) || (scale & HN_GETSCALE)) { 115 for (i = 0; bytes >= max && prefixes[i + 1]; i++) 116 bytes /= divisor; 117 } else { 118 for (i = 0; i < scale && prefixes[i + 1]; i++) 119 bytes /= divisor; 120 } 121 122 if (scale & HN_GETSCALE) 123 return (i); 124 125 if (bytes < 1000 && flags & HN_DECIMAL) { 126 if (len < (baselen + 2 + ((flags & HN_NOSPACE) || (i == 0 && 127 !(flags & HN_B)) ? 0 : 1))) 128 return (-1); 129 s1 = bytes / 100; 130 if ((s2 = (((bytes % 100) + 5) / 10)) == 10) { 131 s1++; 132 s2 = 0; 133 } 134 r = snprintf(buf, len, "%lld%s%lld%s%c%s", 135 /* LONGLONG */ 136 (long long)(sign * s1), 137 localeconv()->decimal_point, 138 /* LONGLONG */ 139 (long long)s2, 140 (i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ? 141 "" : " ", (i == 0 && (flags & HN_B)) ? 'B' : 142 prefixes[i], suffix); 143 144 } else 145 r = snprintf(buf, len, "%lld%s%c%s", 146 /* LONGLONG */ 147 (long long)(sign * ((bytes + 50) / 100)), 148 i == 0 || flags & HN_NOSPACE ? "" : " ", (i == 0 && 149 (flags & HN_B)) ? 'B' : prefixes[i], suffix); 150 151 return (r); 152 } 153