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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