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Command: expand_number | Section: 3 | Source: FreeBSD | File: expand_number.3.gz
EXPAND_NUMBER(3) FreeBSD Library Functions Manual EXPAND_NUMBER(3)
NAME
expand_number - format a number from human readable form
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <libutil.h>
int
expand_number(const char *buf, uint64_t *num);
DESCRIPTION
The expand_number() function parses the buf string and stores a unsigned
64-bit quantity at *num.
The expand_number() function is case-insensitive and follows the SI power
of two convention.
The suffixes are:
Suffix Description Multiplier
K kilo 1024
M mega 1048576
G giga 1073741824
T tera 1099511627776
P peta 1125899906842624
E exa 1152921504606846976
For historical reasons, the expand_number() function accepts and ignores
a single "B" suffix at the end of the buf string. However, the usage of
this suffix is discouraged.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The expand_number() function will fail if:
[EINVAL] The given string contains no digits.
[EINVAL] An unrecognized suffix was given.
[ERANGE] Result doesn't fit into 64 bits.
SEE ALSO
humanize_number(3)
HISTORY
The expand_number() function first appeared in FreeBSD 6.3.
FreeBSD 14.1-RELEASE-p8 June 13, 2023 FreeBSD 14.1-RELEASE-p8