1 .\" $NetBSD: humanize_number.3,v 1.8 2008/04/30 13:10:50 martin Exp $
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34 .Nm dehumanize_number ,
36 .Nd format a number into a human readable form and viceversa
38 .ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
43 .Fn dehumanize_number "const char *str" "int64_t *result"
45 .Fn humanize_number "char *buf" "size_t len" "int64_t number" "const char *suffix" "int scale" "int flags"
49 function formats the signed 64 bit quantity given in
55 is appended to the end.
61 If the formatted number (including
63 would be too long to fit into
67 by 1024 until it will.
70 with the appropriate SI designator.
73 .Bl -column "Prefix" "Description" "Multiplier" -offset indent
74 .It Sy "Prefix" Ta Sy "Description" Ta Sy "Multiplier"
78 .It T tera 1099511627776
79 .It P peta 1125899906842624
80 .It E exa 1152921504606846976
84 must be at least 4 plus the length of
86 in order to ensure a useful result is generated into
88 To use a specific prefix, specify this as
90 (Multiplier = 1024 ^ scale).
91 This can not be combined with any of the
95 The following flags may be passed in
97 .Bl -tag -width Dv -offset indent
99 Format the buffer using the lowest multiplier possible.
101 Return the prefix index number (the number of times
103 must be divided to fit) instead of formatting it to the buffer.
106 The following flags may be passed in
108 .Bl -tag -width Dv -offset indent
110 If the final result is less than 10, display it using one digit.
112 Do not put a space between
116 Use 'B' (bytes) as prefix if the original result does not have a prefix.
117 .It Dv HN_DIVISOR_1000
120 with 1000 instead of 1024.
124 .Fn dehumanize_number
125 function parses the string representing an integral value given in
127 and stores the numerical value in the integer pointed to by
129 The provided string may hold one of the suffixes, which will be interpreted
130 and used to scale up its accompanying numerical value.
133 returns the number of characters stored in
135 (excluding the terminating NUL) upon success, or \-1 upon failure.
138 is specified, the prefix index number will be returned instead.
140 .Fn dehumanize_number
141 returns 0 if the string was parsed correctly.
142 A \-1 is returned to indicate failure and an error code is stored in
145 .Fn dehumanize_number
146 will fail and no number will be stored in
153 was empty or carried an unknown suffix.
157 represented a number that does not fit in
161 .Xr humanize_number 9
167 .Fn dehumanize_number
169 .\" FIXME: This should be in groff, but for now it avoids the warning.
170 .ds operating-system-NetBSD-5.0 5.0