netbsd man page for ctob

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