getbsize (3)
Leading comments
Copyright (c) 1993
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
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 discl...
NAME
getbsize - get preferred block sizeLIBRARY
Lb libbsdSYNOPSIS
In stdlib.h (See libbsd(7) for include usage.) Ft char * Fn getbsize int *headerlenp long *blocksizepDESCRIPTION
The Fn getbsize function returns a preferred block size for reporting by system utilities df(1), du(1), ls(1) and systat(1), based on the value of the BLOCKSIZE environment variable. 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.Valid values of 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.
The Fn getbsize function returns a pointer to a null-terminated string describing the block size, something like ``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.