HUMANIZE_NUMBER(3) BSD Library Functions Manual HUMANIZE_NUMBER(3)
humanize_number -- format a number into a human readable form
humanize_number(char *buf, size_t len, int64_t number,
const char *suffix, int scale, int flags);
The humanize_number() function formats the signed 64 bit quantity given
in number into buffer. A space and then suffix is appended to the end.
buffer must be at least len bytes bytes long.
If the formatted number (including suffix) would be too long to fit into
buffer, then divide number by 1024 until it will. In this case, prefix
suffix with the appropriate SI designator.
The prefixes are:
Prefix Description Multiplier
k kilo 1024
M mega 1048576
G giga 1073741824
T tera 1099511627776
P peta 1125899906842624
E exa 1152921504606846976
len must be at least 4 plus the length of suffix, in order to ensure a
useful result is generated into buffer. To use a specific prefix, spec-
ify this as scale (Multiplier = 1024 ^ scale). This can not be combined
with any of the scale flags below.
The following flags may be passed in scale:
HN_AUTOSCALE Format the buffer using the lowest multiplier possi-
HN_GETSCALE Return the prefix index number (the number of times
number must be divided to fit) instead of formatting
it to the buffer.
The following flags may be passed in flags:
HN_DECIMAL If the final result is less than 10, display it using
HN_NOSPACE Do not put a space between number and the prefix.
HN_B Use 'B' (bytes) as prefix if the original result does
not have a prefix.
Divide number with 1000 instead of 1024.
humanize_number() returns the number of characters stored in buffer
(excluding the terminating NUL) upon success, or -1 upon failure. If
HN_GETSCALE is specified, the prefix index number will be returned
humanize_number() first appeared in NetBSD 2.0.
BSD March 14, 2002 BSD