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-.\" Copyright (c) 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
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-.\"     @(#)getbsize.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd November 16, 2012
-.Dt GETBSIZE 3
-.Os
-.Sh NAME
-.Nm getbsize
-.Nd get preferred block size
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft char *
-.Fn getbsize "int *headerlenp" "long *blocksizep"
-.Sh DESCRIPTION
-The
-.Fn getbsize
-function returns a preferred block size for reporting by system utilities
-.Xr df 1 ,
-.Xr du 1 ,
-.Xr ls 1
-and
-.Xr systat 1 ,
-based on the value of the
-.Ev BLOCKSIZE
-environment variable.
-.Ev BLOCKSIZE
-may be specified directly in bytes, or in multiples of a kilobyte by
-specifying a number followed by ``K'' or ``k'', in multiples of a
-megabyte by specifying a number followed by ``M'' or ``m'' or in
-multiples of a gigabyte by specifying a number followed by ``G'' or
-``g''.
-Multiples must be integers.
-.Pp
-Valid values of
-.Ev BLOCKSIZE
-are 512 bytes to 1 gigabyte.
-Sizes less than 512 bytes are rounded up to 512 bytes, and sizes
-greater than 1 GB are rounded down to 1 GB.
-In each case
-.Fn getbsize
-produces a warning message.
-.Pp
-The
-.Fn getbsize
-function returns a pointer to a null-terminated string describing
-the block size, something like
-.Dq 1K-blocks .
-The memory referenced by
-.Fa headerlenp
-is filled in with the length of the string (not including the
-terminating null).
-The memory referenced by
-.Fa blocksizep
-is filled in with block size, in bytes.
-.Sh SEE ALSO
-.Xr df 1 ,
-.Xr du 1 ,
-.Xr ls 1 ,
-.Xr systat 1 ,
-.Xr environ 7
-.Sh HISTORY
-The
-.Fn getbsize
-function first appeared in
-.Bx 4.4 .