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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*
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* lround_generic.c
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*
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* $Id: lround_generic.c,v 1.1 2008/06/03 18:42:21 keithmarshall Exp $
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*
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* Provides a generic implementation for the `lround()', `lroundf()',
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* `lroundl()', `llround()', `llroundf()' and `llroundl()' functions;
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* compile with `-D FUNCTION=name', with `name' set to each of these
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* six in turn, to create separate object files for each of the six
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* 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 `lround', `lroundf', `lroundl', `llround'
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* `llroundf' and `llroundl'; specifying anything else will most likely
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* cause a compilation error. If user did not specify an appropriate
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* FUNCTION name, default to `lround'.
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*/
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#define FUNCTION lround
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#endif
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#include "round_internal.h"
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#include <limits.h>
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#include <errno.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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* while RETURN_MAX and RETURN_MIN map to the correspondingly
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* appropriate limits.h manifest values, to establish the
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* valid range for the RETURN_TYPE.
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*/
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RETURN_TYPE FUNCTION( INPUT_TYPE x )
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{
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if( !isfinite( x ) || !isfinite( x = round_internal( x ) )
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|| (x > MAX_RETURN_VALUE) || (x < MIN_RETURN_VALUE) )
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/*
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* Undefined behaviour...
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* POSIX requires us to report a domain error; ANSI C99 says we
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* _may_ report a range error, and previous MinGW implementation
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* set `errno = ERANGE' here; we change that, conforming to the
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* stricter requiremment of the POSIX standard.
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*/
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errno = EDOM;
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return (RETURN_TYPE)(x);
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}
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/* $RCSfile: lround_generic.c,v $$Revision: 1.1 $: end of file */
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