1 .\" $NetBSD: humanize_number.3,v 1.5 2005/04/11 12:19:16 wiz Exp $
2 .\" $FreeBSD: src/lib/libutil/humanize_number.3,v 1.12 2007/09/28 15:31:44 obrien Exp $
3 .\" $DragonFly: src/lib/libutil/humanize_number.3,v 1.4 2008/09/14 20:04:59 swildner Exp $
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32 .Dd September 14, 2008
36 .Nm dehumanize_number ,
38 .Nd format a number into a human readable form and vice versa
44 .Fn dehumanize_number "const char *str" "int64_t *result"
47 .Fa "char *buf" "size_t len" "int64_t number" "const char *suffix"
48 .Fa "int scale" "int flags"
53 function formats the signed 64 bit quantity given in
59 is appended to the end.
60 The buffer pointed to by
66 If the formatted number (including
68 would be too long to fit into
72 by 1024 until it will.
75 with the appropriate SI designator.
79 follows the traditional computer science conventions rather than the proposed
80 SI power of two convention.
83 .Bl -column "Prefix" "Description" "1000000000000000000" -offset indent
84 .It Sy "Prefix" Ta Sy "Description" Ta Sy "Multiplier" Ta Sy "Multiplier 1000x"
85 .It Li k Ta No kilo Ta 1024 Ta 1000
86 .It Li M Ta No mega Ta 1048576 Ta 1000000
87 .It Li G Ta No giga Ta 1073741824 Ta 1000000000
88 .It Li T Ta No tera Ta 1099511627776 Ta 1000000000000
89 .It Li P Ta No peta Ta 1125899906842624 Ta 1000000000000000
90 .It Li E Ta No exa Ta 1152921504606846976 Ta 1000000000000000000
95 argument must be at least 4 plus the length of
97 in order to ensure a useful result is generated into
99 To use a specific prefix, specify this as
101 (multiplier = 1024 ^ scale).
102 This cannot be combined with any of the
106 The following flags may be passed in
108 .Bl -tag -width ".Dv HN_DIVISOR_1000" -offset indent
110 Format the buffer using the lowest multiplier possible.
112 Return the prefix index number (the number of times
114 must be divided to fit) instead of formatting it to the buffer.
117 The following flags may be passed in
119 .Bl -tag -width ".Dv HN_DIVISOR_1000" -offset indent
121 If the final result is less than 10, display it using one digit.
123 Do not put a space between
129 (bytes) as prefix if the original result does not have a prefix.
130 .It Dv HN_DIVISOR_1000
133 with 1000 instead of 1024.
137 .Fn dehumanize_number
138 function parses the string representing an integral value given in
140 and stores the numerical value in the integer pointed to by
142 The provided string may hold one of the suffixes, which will be interpreted
143 and used to scale up its accompanying numerical value.
147 function returns the number of characters stored in
149 (excluding the terminating
151 upon success, or \-1 upon failure.
154 is specified, the prefix index number will be returned instead.
157 .Fn dehumanize_number
158 function returns 0 if the string was parsed correctly.
159 A \-1 is returned to indicate failure and an error code is stored in
163 .Fn dehumanize_number
164 function will fail and no number will be stored in
171 was empty or carried an unknown suffix.
175 represented a number that does not fit in
181 function first appeared in
187 .Fn dehumanize_number
188 function first appeared in