52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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/*
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* round_generic.c
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*
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* $Id$
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*
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* Provides a generic implementation for the `round()', `roundf()'
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* and `roundl()' functions; compile with `-D FUNCTION=name', with
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* `name' set to each of these three in turn, to create separate
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* object files for each of the three functions.
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*
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* Written by Keith Marshall <keithmarshall@users.sourceforge.net>
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*
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* This is free software. You may redistribute and/or modify it as you
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* see fit, without restriction of copyright.
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*
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* This software is provided "as is", in the hope that it may be useful,
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* but WITHOUT WARRANTY OF ANY KIND, not even any implied warranty of
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* MERCHANTABILITY, nor of FITNESS FOR ANY PARTICULAR PURPOSE. At no
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* time will the author accept any form of liability for any damages,
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* however caused, resulting from the use of this software.
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*
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*/
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#ifndef FUNCTION
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/*
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* Normally specified with `-D FUNCTION=name', on the command line.
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* Valid FUNCTION names are `round', `roundf' and `roundl'; specifying
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* anything else will most likely cause a compilation error. If user
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* did not specify any FUNCTION name, default to `round'.
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*/
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#define FUNCTION round
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#endif
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#include "round_internal.h"
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/* Generic implementation.
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* The user is required to specify the FUNCTION name;
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* the RETURN_TYPE and INPUT_TYPE macros resolve to appropriate
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* type declarations, to match the selected FUNCTION prototype.
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*/
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RETURN_TYPE FUNCTION( INPUT_TYPE x )
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{
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/* Round to nearest integer, away from zero for half-way.
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*
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* We split it with the `round_internal()' function in
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* a private header file, so that it may be shared by this,
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* `lround()' and `llround()' implementations.
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*/
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return isfinite( x ) ? round_internal( x ) : x;
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}
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/* $RCSfile$$Revision$: end of file */
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