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NetBSD 6.1.5 - man page for humanize_number (netbsd section 9)

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HUMANIZE_NUMBER(9)		  BSD Kernel Developer's Manual 	       HUMANIZE_NUMBER(9)

     humanize_number, format_bytes -- human readable numbers

     humanize_number(char *buf, size_t len, uint64_t number, const char *suffix, int divisor);

     format_bytes(char *buf, size_t len, uint64_t number);

     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 suf-
     fix is removed.  This means that a result of ``100000'' occurs, instead of ``100000 B''.

     Both functions return the number of characters stored in buf (excluding the terminating NUL)
     upon success, or -1 upon failure.


     These functions first appeared in NetBSD 1.5.

BSD					  August 7, 2010				      BSD
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