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HUMANIZE_NUMBER(3)         Library Functions Manual         HUMANIZE_NUMBER(3)

     dehumanize_number, humanize_number - format a number into a human
     readable form and vice versa

     #include <stdlib.h>

     dehumanize_number(const char *str, int64_t *result);

     humanize_number(char *buffer, size_t len, int64_t number,
         const char *suffix, int scale, int flags);

     The humanize_number() function formats the signed 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 long.

     If the formatted number (including suffix) would be too long to fit into
     buffer, then divide number by 1024 until it will.  In this case, prefix
     suffix with the appropriate SI designator.

     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.  To use a specific prefix,
     specify this as scale (Multiplier = 1024 ^ scale).  This can not be
     combined with any of the scale flags below.

     The following flags may be passed in scale:

           HN_AUTOSCALE  Format the buffer using the lowest multiplier

           HN_GETSCALE   Return the prefix index number (the number of times
                         number must be divided to fit) instead of formatting
                         it to the buffer.

     The following flags may be passed in flags:

           HN_DECIMAL    If the final result is less than 10, display it using
                         one digit.

           HN_NOSPACE    Do not put a space between number and the prefix.

           HN_B          Use 'B' (bytes) as prefix if the original result does
                         not have a prefix.

                         Divide number with 1000 instead of 1024.

     The dehumanize_number() function parses the string representing an
     integral value given in str and stores the numerical value in the integer
     pointed to by result.  The provided string may hold one of the suffixes,
     which will be interpreted and used to scale up its accompanying numerical

     humanize_number() returns the number of characters stored in buffer
     (excluding the terminating NUL) upon success, or -1 upon failure.  If
     HN_GETSCALE is specified, the prefix index number will be returned

     dehumanize_number() returns 0 if the string was parsed correctly.  A -1
     is returned to indicate failure and an error code is stored in errno.

     dehumanize_number() will fail and no number will be stored in result if:

     [EINVAL]           The string in str was empty or carried an unknown

     [ERANGE]           The string in str represented a number that does not
                        fit in result.

     strsuftoll(3), orders(7), humanize_number(9)

     humanize_number() first appeared in NetBSD 2.0.

     dehumanize_number() first appeared in NetBSD 5.0.

NetBSD 8.0                     January 14, 2011                     NetBSD 8.0