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Take the lastest fixes from NetBSD.

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Obtained from:	NetBSD
This commit is contained in:
Pawel Jakub Dawidek 2004-09-25 14:11:34 +00:00
parent 864fe1ec99
commit bd52c9ac59
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=135792
2 changed files with 72 additions and 92 deletions
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46
lib/libutil/humanize_number.3
View File

@ -35,7 +35,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd May 25, 2004
.Dd Sep 25, 2004
.Dt HUMANIZE_NUMBER 3
.Os
.Sh NAME
@ -53,14 +53,13 @@
.Sh DESCRIPTION
The
.Fn humanize_number
function formats the signed 64-bit quantity given in
function formats the signed 64 bit quantity given in
.Fa number
into
.Fa buffer .
A space and then
.Fa suffix
is appended to the end.
The buffer pointed to by
.Fa buffer
must be at least
.Fa len
@ -80,30 +79,29 @@ with the appropriate SI designator.
The prefixes are:
.Bl -column "Prefix" "Description" "Multiplier" -offset indent
.It Sy "Prefix" Ta Sy "Description" Ta Sy "Multiplier"
.It Li k Ta No kilo Ta 1024
.It Li M Ta No mega Ta 1048576
.It Li G Ta No giga Ta 1073741824
.It Li T Ta No tera Ta 1099511627776
.It Li P Ta No peta Ta 1125899906842624
.It Li E Ta No exa Ta 1152921504606846976
.It k kilo 1024
.It M mega 1048576
.It G giga 1073741824
.It T tera 1099511627776
.It P peta 1125899906842624
.It E exa 1152921504606846976
.El
.Pp
The
.Fa len
argument must be at least 4 plus the length of
must be at least 4 plus the length of
.Fa suffix ,
in order to ensure a useful result is generated into
.Fa buffer .
To use a specific prefix, specify this as
.Fa scale
(multiplier = 1024 ^ scale).
This cannot be combined with any of the
(Multiplier = 1024 ^ scale).
This can not be combined with any of the
.Fa scale
flags below.
.Pp
The following flags may be passed in
.Fa scale :
.Bl -tag -width ".Dv HN_DIVISOR_1000" -offset indent
.Pa scale :
.Bl -tag -width Dv -offset indent
.It Dv HN_AUTOSCALE
Format the buffer using the lowest multiplier possible.
.It Dv HN_GETSCALE
@ -113,8 +111,8 @@ must be divided to fit) instead of formatting it to the buffer.
.El
.Pp
The following flags may be passed in
.Fa flags :
.Bl -tag -width ".Dv HN_DIVISOR_1000" -offset indent
.Pa flags :
.Bl -tag -width Dv -offset indent
.It Dv HN_DECIMAL
If the final result is less than 10, display it using one digit.
.It Dv HN_NOSPACE
@ -122,27 +120,21 @@ Do not put a space between
.Fa number
and the prefix.
.It Dv HN_B
Use
.Ql B
(bytes) as prefix if the original result does not have a prefix.
Use 'B' (bytes) as prefix if the original result does not have a prefix.
.It Dv HN_DIVISOR_1000
Divide
.Fa number
with 1000 instead of 1024.
.El
.Sh RETURN VALUES
The
.Fn humanize_number
function returns the number of characters stored in
returns the number of characters stored in
.Fa buffer
(excluding the terminating
.Dv NUL )
upon success, or \-1 upon failure.
(excluding the terminating NUL) upon success, or \-1 upon failure.
If
.Dv HN_GETSCALE
is specified, the prefix index number will be returned instead.
.Sh HISTORY
The
.Fn humanize_number
function first appeared in
first appeared in
.Nx 2.0 .

118
lib/libutil/humanize_number.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: humanize_number.c,v 1.5 2003/12/26 11:30:36 simonb Exp $ */
/* $NetBSD: humanize_number.c,v 1.8 2004/07/27 01:56:24 enami Exp $ */
/*
* Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
@ -52,10 +52,10 @@ int
humanize_number(char *buf, size_t len, int64_t bytes,
const char *suffix, int scale, int flags)
{
const char *prefixes;
int i, r;
int64_t divisor, max, s1, s2, sign;
size_t baselen, suffixlen;
const char *prefixes, *sep;
int b, i, r, maxscale, s1, s2, sign;
int64_t divisor, max;
size_t baselen;
assert(buf != NULL);
assert(suffix != NULL);
@ -64,18 +64,27 @@ humanize_number(char *buf, size_t len, int64_t bytes,
if (flags & HN_DIVISOR_1000) {
/* SI for decimal multiplies */
divisor = 1000;
prefixes = " kMGTPE";
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;
prefixes = " KMGTPE";
if (flags & HN_B)
prefixes = "B\0K\0M\0G\0T\0P\0E";
else
prefixes = "\0\0K\0M\0G\0T\0P\0E";
}
if ((size_t) scale >= strlen(prefixes) && scale != HN_AUTOSCALE &&
scale != HN_GETSCALE)
#define SCALE2PREFIX(scale) (&prefixes[(scale) << 1])
maxscale = 7;
if (scale >= maxscale &&
(scale & (HN_AUTOSCALE | HN_GETSCALE)) == 0)
return (-1);
if (buf == NULL || suffix == NULL)
@ -86,75 +95,54 @@ humanize_number(char *buf, size_t len, int64_t bytes,
if (bytes < 0) {
sign = -1;
bytes *= -100;
baselen = 4;
baselen = 3; /* sign, digit, prefix */
} else {
sign = 1;
bytes *= 100;
baselen = 3;
baselen = 2; /* digit, prefix */
}
if (flags & HN_NOSPACE)
sep = "";
else {
sep = " ";
baselen++;
}
baselen += strlen(suffix);
suffixlen = strlen(suffix);
/* check if enough room for `x y' + suffix + `\0' */
if (len < baselen + suffixlen + 1)
/* Check if enough room for `x y' + suffix + `\0' */
if (len < baselen + 1)
return (-1);
if (flags & HN_DIVISOR_1000)
divisor = 1000;
else
divisor = 1024;
if (scale & (HN_AUTOSCALE | HN_GETSCALE)) {
/* See if there is additional columns can be used. */
for (max = 100, i = len - baselen; i-- > 0;)
max *= 10;
max = 100;
for (i = 0;
(size_t) i < len - suffixlen - baselen + ((flags & HN_NOSPACE) ?
1 : 0); i++)
max *= 10;
if ((scale & HN_AUTOSCALE) || (scale & HN_GETSCALE)) {
for (i = 0; bytes >= max && prefixes[i + 1]; i++)
for (i = 0; bytes >= max && i < maxscale; i++)
bytes /= divisor;
} else {
for (i = 0; i < scale && prefixes[i + 1]; i++)
bytes /= divisor;
}
if (scale & HN_GETSCALE)
return (i);
if (bytes < 1000 && flags & HN_DECIMAL) {
if (len < (baselen + 2 + ((flags & HN_NOSPACE) || (i == 0 &&
!(flags & HN_B)) ? 0 : 1)))
return (-1);
s1 = bytes / 100;
if ((s2 = (((bytes % 100) + 5) / 10)) == 10) {
s1++;
s2 = 0;
}
if (s1 < 10 && i == 0)
/* Don't ever use .0 for a number less than 10. */
r = snprintf(buf, len, "%lld%s%c%s",
/* LONGLONG */
(long long)(sign * s1),
(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
prefixes[i], suffix);
else
r = snprintf(buf, len, "%lld%s%lld%s%c%s",
/* LONGLONG */
(long long)(sign * s1),
localeconv()->decimal_point,
/* LONGLONG */
(long long)s2,
(i == 0 && !(flags & HN_B)) || flags & HN_NOSPACE ?
"" : " ", (i == 0 && (flags & HN_B)) ? 'B' :
prefixes[i], suffix);
if (scale & HN_GETSCALE)
return (i);
} else
r = snprintf(buf, len, "%lld%s%c%s",
for (i = 0; i < scale && i < maxscale; i++)
bytes /= 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;
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, "%lld%s%s%s",
/* LONGLONG */
(long long)(sign * ((bytes + 50) / 100)),
i == 0 || flags & HN_NOSPACE ? "" : " ", (i == 0 &&
(flags & HN_B)) ? 'B' : prefixes[i], suffix);
sep, SCALE2PREFIX(i), suffix);
return (r);
}