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Annotation of src/lib/libm/src/s_roundf.c, Revision 1.1.2.2

1.1.2.2 ! he          1: /*-
        !             2:  * Copyright (c) 2003, Steven G. Kargl
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice unmodified, this list of conditions, and the following
        !            10:  *    disclaimer.
        !            11:  * 2. Redistributions in binary form must reproduce the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer in the
        !            13:  *    documentation and/or other materials provided with the distribution.
        !            14:  *
        !            15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            17:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            18:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            19:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            20:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            21:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            22:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            23:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            24:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            25:  */
        !            26:
        !            27: #include <sys/cdefs.h>
        !            28: #if defined(LIBM_SCCS) && !defined(lint)
        !            29: __RCSID("$NetBSD: s_roundf.c,v 1.1.2.1 2004/07/15 20:57:36 he Exp $");
        !            30: #if 0
        !            31: __FBSDID("$FreeBSD: src/lib/msun/src/s_roundf.c,v 1.1 2004/06/07 08:05:36 das Exp $");
        !            32: #endif
        !            33: #endif
        !            34:
        !            35: #include <math.h>
        !            36:
        !            37: float
        !            38: roundf(float x)
        !            39: {
        !            40:        float t;
        !            41:        int i;
        !            42:
        !            43:        i = fpclassify(x);
        !            44:        if (i == FP_INFINITE || i == FP_NAN)
        !            45:                return (x);
        !            46:
        !            47:        if (x >= 0.0) {
        !            48:                t = ceilf(x);
        !            49:                if (t - x > 0.5)
        !            50:                        t -= 1.0;
        !            51:                return (t);
        !            52:        } else {
        !            53:                t = ceilf(-x);
        !            54:                if (t + x > 0.5)
        !            55:                        t -= 1.0;
        !            56:                return (-t);
        !            57:        }
        !            58: }

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