humanize_number, format_bytes - format a number into a human readable
humanize_number(char *buf, size_t len, u_int64_t number,
const char *suffix, int divisor);
format_bytes(char *buf, size_t len, u_int64_t number);
The humanize_number() function formats the unsigned 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 divisor until it will. In this case, prefix
suffix with the appropriate SI designator. Suitable values of
divisor are 1024 or 1000 to remain consistent with the common meanings of
the SI designator prefixes.
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.
The format_bytes() function is a front-end to humanize_number() that
calls the latter with a suffix of ``B''. Also, if the suffix in the
returned buffer would not have a prefix, remove the suffix. This means
that a result of ``100000'' occurs, instead of ``100000 B''.
humanize_number() and format_bytes() return the number of characters
stored in buffer (excluding the terminating NUL) upon success, or -1 upon
humanize_number() and format_bytes() first appeared in NetBSD 1.5.
BSD May 21, 1999 BSD
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