213b954a90
- Add check in roundx() functions for infinite or NaN cases - Add block to avoid style warnings - Define long double constants and macros for infinity and nan - Correct return syntax to match NuttX style - Make c89 compliant - Fix definitions of INFINITY_L/NAN_L * include/nuttx/lib/math.h - match standard naming conventions - Rename isinf_l to isinfl - Rename isinf_f to isinff - Add finite() - Add finitel() - Add finitef() - Define isnanl and isnanf - Define isfinite() so that it uses the appropriate macro * libs/libc/math/lib_asinf.c libs/libc/math/lib_asinl.c libs/libc/math/lib_roundf.c libs/libc/math/lib_roundl.c libs/libc/math/lib_sqrtf.c libs/libc/math/lib_sqrtl.c - Use renamed macros - Use correct NAN_x or INFINIT_x macro on returns
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/****************************************************************************
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* libs/libc/math/lib_roundf.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <math.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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float roundf(float x)
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{
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float f;
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if (isinff(x) || isnanf(x))
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{
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return x;
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}
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f = modff(x, &x);
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if (x <= 0.0f && f <= -0.5f)
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{
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x -= 1.0f;
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}
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if (x >= 0.0f && f >= 0.5f)
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{
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x += 1.0f;
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}
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return x;
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}
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