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btoc(9) [netbsd man page]

CTOD(9) 						   BSD Kernel Developer's Manual						   CTOD(9)

NAME
ctod -- macros related to bytes, pages, and disk blocks SYNOPSIS
#include <sys/param.h> size ctod(size x); size dtoc(size x); size ctob(size x); size btoc(size x); size dbtob(size x); size btodb(size x); DESCRIPTION
The ctod family of macros can be used to convert between bytes, pages (``clicks''), and disk blocks. The following table lists the possible conversions: Macro From To ctod() pages disk blocks dtoc() disk blocks pages ctob() pages bytes btoc() bytes pages dbtob() disk blocks bytes btodb() bytes disk blocks These are typical macros that may appear with different names in other operating systems. Examples include btop() and btopr() in Solaris. SEE ALSO
param(3) HISTORY
Some of these macros appeared in Version 7 AT&T UNIX. CAVEATS
The described macros make no assumptions about the type of the input parameter. A caller should ensure that neither integer overflow nor integer underflow are possible. BSD
April 8, 2011 BSD

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ROUNDUP(9)						   BSD Kernel Developer's Manual						ROUNDUP(9)

NAME
roundup -- macros for counting and rounding SYNOPSIS
#include <sys/param.h> size howmany(x, size); size roundup(x, size); size rounddown(x, size); size roundup2(x, size); int powerof2(x); DESCRIPTION
The roundup() and rounddown() macros return an integer from rounding x up and down, respectively, to the next size. The howmany() macro in turn reveals how many times size fits into x, rounding the residual up. The roundup2() macro also rounds up, but with the assumption that size is a power of two. If x is indeed a power of two, powerof2() return 1. RETURN VALUES
The return value is an integer from the respective operation. If x is 0, all macros except powerof2() return 0. The behavior is undefined if size is 0. EXAMPLES
The following example rounds the variable rx to a 32-bit boundary: uint16_t rx; ... rx = roundup2(rx, sizeof(uint32_t)); SEE ALSO
ilog2(3), param(3), imax(9) CAVEATS
All described macros make no assumptions about the type of the parameters. These are implicitly assumed to be unsigned integers. BSD
June 1, 2011 BSD
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