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Update humanize_number() from FreeBSD

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Implements HN_IEC_PREFIXES.
This commit is contained in:
Guillem Jover 2018-05-20 19:22:16 +02:00
parent facbddb652
commit e3979d1a7c
3 changed files with 102 additions and 62 deletions
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1
COPYING
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@ -273,6 +273,7 @@ Files:
src/stringlist.c
Copyright:
Copyright © 1994, 1997-2000, 2002, 2008, 2010 The NetBSD Foundation, Inc.
Copyright © 2013 John-Mark Gurney <jmg@FreeBSD.org>
All rights reserved.
.
Some code was contributed to The NetBSD Foundation by Allen Briggs.

16
include/bsd/libutil.h
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@ -67,14 +67,16 @@ int pidfile_remove(struct pidfh *pfh);
char *fparseln(FILE *, size_t *, size_t *, const char[3], int);
__END_DECLS
/* humanize_number(3) */
#define HN_DECIMAL 0x01
#define HN_NOSPACE 0x02
#define HN_B 0x04
#define HN_DIVISOR_1000 0x08
/* Values for humanize_number(3)'s flags parameter. */
#define HN_DECIMAL 0x01
#define HN_NOSPACE 0x02
#define HN_B 0x04
#define HN_DIVISOR_1000 0x08
#define HN_IEC_PREFIXES 0x10
#define HN_GETSCALE 0x10
#define HN_AUTOSCALE 0x20
/* Values for humanize_number(3)'s scale parameter. */
#define HN_GETSCALE 0x10
#define HN_AUTOSCALE 0x20
/*
* fparseln() specific operation flags.

147
src/humanize_number.c
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@ -1,7 +1,10 @@
/* $NetBSD: humanize_number.c,v 1.14 2008/04/28 20:22:59 martin Exp $ */
/*
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
* Copyright 2013 John-Mark Gurney <jmg@FreeBSD.org>
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
@ -31,6 +34,7 @@
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
@ -39,58 +43,81 @@
#include <locale.h>
#include <libutil.h>
static const int maxscale = 6;
int
humanize_number(char *buf, size_t len, int64_t bytes,
humanize_number(char *buf, size_t len, int64_t quotient,
const char *suffix, int scale, int flags)
{
const char *prefixes, *sep;
int b, i, r, maxscale, s1, s2, sign;
int i, r, remainder, s1, s2, sign;
int divisordeccut;
int64_t divisor, max;
size_t baselen;
assert(buf != NULL);
assert(suffix != NULL);
assert(scale >= 0);
if (flags & HN_DIVISOR_1000) {
/* SI for decimal multiplies */
divisor = 1000;
if (flags & HN_B)
prefixes = "B\0k\0M\0G\0T\0P\0E";
else
prefixes = "\0\0k\0M\0G\0T\0P\0E";
} else {
/*
* binary multiplies
* XXX IEC 60027-2 recommends Ki, Mi, Gi...
*/
divisor = 1024;
if (flags & HN_B)
prefixes = "B\0K\0M\0G\0T\0P\0E";
else
prefixes = "\0\0K\0M\0G\0T\0P\0E";
}
#define SCALE2PREFIX(scale) (&prefixes[(scale) << 1])
maxscale = 7;
if (scale >= maxscale &&
(scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0)
return (-1);
if (buf == NULL || suffix == NULL)
return (-1);
/* Since so many callers don't check -1, NUL terminate the buffer */
if (len > 0)
buf[0] = '\0';
if (bytes < 0) {
/* validate args */
if (buf == NULL || suffix == NULL)
return (-1);
if (scale < 0)
return (-1);
else if (scale > maxscale &&
((scale & ~(HN_AUTOSCALE|HN_GETSCALE)) != 0))
return (-1);
if ((flags & HN_DIVISOR_1000) && (flags & HN_IEC_PREFIXES))
return (-1);
/* setup parameters */
remainder = 0;
if (flags & HN_IEC_PREFIXES) {
baselen = 2;
/*
* Use the prefixes for power of two recommended by
* the International Electrotechnical Commission
* (IEC) in IEC 80000-3 (i.e. Ki, Mi, Gi...).
*
* HN_IEC_PREFIXES implies a divisor of 1024 here
* (use of HN_DIVISOR_1000 would have triggered
* an assertion earlier).
*/
divisor = 1024;
divisordeccut = 973; /* ceil(.95 * 1024) */
if (flags & HN_B)
prefixes = "B\0\0Ki\0Mi\0Gi\0Ti\0Pi\0Ei";
else
prefixes = "\0\0\0Ki\0Mi\0Gi\0Ti\0Pi\0Ei";
} else {
baselen = 1;
if (flags & HN_DIVISOR_1000) {
divisor = 1000;
divisordeccut = 950;
if (flags & HN_B)
prefixes = "B\0\0k\0\0M\0\0G\0\0T\0\0P\0\0E";
else
prefixes = "\0\0\0k\0\0M\0\0G\0\0T\0\0P\0\0E";
} else {
divisor = 1024;
divisordeccut = 973; /* ceil(.95 * 1024) */
if (flags & HN_B)
prefixes = "B\0\0K\0\0M\0\0G\0\0T\0\0P\0\0E";
else
prefixes = "\0\0\0K\0\0M\0\0G\0\0T\0\0P\0\0E";
}
}
#define SCALE2PREFIX(scale) (&prefixes[(scale) * 3])
if (quotient < 0) {
sign = -1;
bytes *= -100;
baselen = 3; /* sign, digit, prefix */
quotient = -quotient;
baselen += 2; /* sign, digit */
} else {
sign = 1;
bytes *= 100;
baselen = 2; /* digit, prefix */
baselen += 1; /* digit */
}
if (flags & HN_NOSPACE)
sep = "";
@ -106,7 +133,7 @@ humanize_number(char *buf, size_t len, int64_t bytes,
if (scale & (HN_AUTOSCALE | HN_GETSCALE)) {
/* See if there is additional columns can be used. */
for (max = 100, i = len - baselen; i-- > 0;)
for (max = 1, i = len - baselen; i-- > 0;)
max *= 10;
/*
@ -114,29 +141,39 @@ humanize_number(char *buf, size_t len, int64_t bytes,
* If there will be an overflow by the rounding below,
* divide once more.
*/
for (i = 0; bytes >= max - 50 && i < maxscale; i++)
bytes /= divisor;
for (i = 0;
(quotient >= max || (quotient == max - 1 &&
(remainder >= divisordeccut || remainder >=
divisor / 2))) && i < maxscale; i++) {
remainder = quotient % divisor;
quotient /= divisor;
}
if (scale & HN_GETSCALE)
return (i);
} else
for (i = 0; i < scale && i < maxscale; i++)
bytes /= divisor;
} else {
for (i = 0; i < scale && i < maxscale; i++) {
remainder = quotient % divisor;
quotient /= divisor;
}
}
/* If a value <= 9.9 after rounding and ... */
if (bytes < 995 && i > 0 && flags & HN_DECIMAL) {
/* baselen + \0 + .N */
if (len < baselen + 1 + 2)
return (-1);
b = ((int)bytes + 5) / 10;
s1 = b / 10;
s2 = b % 10;
/*
* XXX - should we make sure there is enough space for the decimal
* place and if not, don't do HN_DECIMAL?
*/
if (((quotient == 9 && remainder < divisordeccut) || quotient < 9) &&
i > 0 && flags & HN_DECIMAL) {
s1 = (int)quotient + ((remainder * 10 + divisor / 2) /
divisor / 10);
s2 = ((remainder * 10 + divisor / 2) / divisor) % 10;
r = snprintf(buf, len, "%d%s%d%s%s%s",
sign * s1, localeconv()->decimal_point, s2,
sep, SCALE2PREFIX(i), suffix);
} else
r = snprintf(buf, len, "%" PRId64 "%s%s%s",
sign * ((bytes + 50) / 100),
sign * (quotient + (remainder + divisor / 2) / divisor),
sep, SCALE2PREFIX(i), suffix);
return (r);