BITMAP_ORD_TO_POS(9) Basic Kernel Library Functions BITMAP_ORD_TO_POS(9)NAME
bitmap_ord_to_pos - find position of n-th set bit in bitmap
SYNOPSIS
int bitmap_ord_to_pos(const unsigned long * buf, int ord, int bits);
ARGUMENTS
buf
pointer to bitmap
ord
ordinal bit position (n-th set bit, n >= 0)
bits
number of valid bit positions in buf
DESCRIPTION
Map the ordinal offset of bit ord in buf to its position in buf. Value of ord should be in range 0 <= ord < weight(buf), else results are
undefined.
If for example, just bits 4 through 7 are set in buf, then ord values 0 through 3 will get mapped to 4 through 7, respectively, and all
other ord values return undefined values. When ord value 3 gets mapped to (returns) pos value 7 in this example, that means that the 3rd
set bit (starting with 0th) is at position 7 in buf.
The bit positions 0 through bits are valid positions in buf.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BITMAP_ORD_TO_POS(9)
Check Out this Related Man Page
HUMANIZE_NUMBER(9) BSD Kernel Developer's Manual HUMANIZE_NUMBER(9)NAME
humanize_number, format_bytes -- human readable numbers
SYNOPSIS
int
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);
DESCRIPTION
The 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''.
RETURN VALUES
Both functions return the number of characters stored in buf (excluding the terminating NUL) upon success, or -1 upon failure.
SEE ALSO humanize_number(3)HISTORY
These functions first appeared in NetBSD 1.5.
BSD August 7, 2010 BSD
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