1 /* $NetBSD: humanize_number.c,v 1.8 2004/07/27 01:56:24 enami Exp $ */
4 * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
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.
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12 * modification, are permitted provided that the following conditions
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20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
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27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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40 #include <sys/cdefs.h>
42 #include <sys/types.h>
53 /* humanize_number(3) */
54 #define HN_DECIMAL 0x01
55 #define HN_NOSPACE 0x02
57 #define HN_DIVISOR_1000 0x08
59 #define HN_GETSCALE 0x10
60 #define HN_AUTOSCALE 0x20
63 xo_humanize_number (char *buf, size_t len, int64_t bytes,
64 const char *suffix, int scale, int flags)
66 const char *prefixes, *sep;
67 int b, i, r, maxscale, s1, s2, sign;
69 // We multiply bytes by 100 to deal with rounding, so we need something
70 // big enough to hold LLONG_MAX * 100. On 64-bit we can use 128-bit wide
71 // integers with __int128_t, but on 32-bit we have to use long double.
73 __int128_t scalable = (__int128_t)bytes;
75 long double scalable = (long double)bytes;
80 assert(suffix != NULL);
83 if (flags & HN_DIVISOR_1000) {
84 /* SI for decimal multiplies */
87 prefixes = "B\0k\0M\0G\0T\0P\0E";
89 prefixes = "\0\0k\0M\0G\0T\0P\0E";
93 * XXX IEC 60027-2 recommends Ki, Mi, Gi...
97 prefixes = "B\0K\0M\0G\0T\0P\0E";
99 prefixes = "\0\0K\0M\0G\0T\0P\0E";
102 #define SCALE2PREFIX(scale) (&prefixes[(scale) << 1])
105 if (scale >= maxscale &&
106 (scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0)
109 if (buf == NULL || suffix == NULL)
117 baselen = 3; /* sign, digit, prefix */
121 baselen = 2; /* digit, prefix */
123 if (flags & HN_NOSPACE)
129 baselen += strlen(suffix);
131 /* Check if enough room for `x y' + suffix + `\0' */
132 if (len < baselen + 1)
135 if (scale & (HN_AUTOSCALE | HN_GETSCALE)) {
136 /* See if there is additional columns can be used. */
137 for (max = 100, i = len - baselen; i-- > 0;)
140 for (i = 0; scalable >= max && i < maxscale; i++)
143 if (scale & HN_GETSCALE)
146 for (i = 0; i < scale && i < maxscale; i++)
149 /* If a value <= 9.9 after rounding and ... */
150 if (scalable < 995 && i > 0 && flags & HN_DECIMAL) {
151 /* baselen + \0 + .N */
152 if (len < baselen + 1 + 2)
154 b = ((int)scalable + 5) / 10;
157 r = snprintf(buf, len, "%s%d%s%d%s%s%s",
158 ((sign == -1) ? "-" : ""),
159 s1, localeconv()->decimal_point, s2,
160 sep, SCALE2PREFIX(i), suffix);
162 r = snprintf(buf, len, "%s%lld%s%s%s",
164 ((sign == -1) ? "-" : ""),
165 (long long)((scalable + 50) / 100),
166 sep, SCALE2PREFIX(i), suffix);