HUMANIZE_NUMBER(9) | Kernel Developer's Manual | HUMANIZE_NUMBER(9) |
humanize_number
, format_bytes
—
humanize_number
(char
*buf, size_t len,
uint64_t number,
const char *suffix,
int divisor);
int
format_bytes
(char
*buf, size_t len,
uint64_t number);
humanize_number
() function formats the unsigned
64-bit quantity given in number into
buf. A space and then suffix is
appended to the end. The supplied buf must be at least
len bytes long.
If the formatted number (including suffix)
is too long to fit into buf,
humanize_number
() divides
number by divisor until it will
fit. In this case, suffix is prefixed 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 |
The len argument must be at least 4 plus the length of suffix, in order to ensure a useful result in buf.
The format_bytes
() function is a front-end
to humanize_number
(). It calls the latter with a
suffix of “B”. Also, if the suffix in
the returned buf would not have a prefix, the suffix
is removed. This means that a result of “100000” occurs,
instead of “100000 B”.
August 7, 2010 | NetBSD 9.2 |