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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Wrapper to set errno for scalb.
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Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Only build wrappers from the templates for the types that define the macro
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below. This macro is set in math-type-macros-<type>.h in sysdeps/generic
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for each floating-point type. */
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#if __USE_WRAPPER_TEMPLATE
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#include <errno.h>
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#include <math.h>
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#include <math_private.h>
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/* Wrapper scalb */
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FLOAT M_DECL_FUNC (__scalb) (FLOAT x, FLOAT fn)
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{
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FLOAT z = M_SUF (__ieee754_scalb) (x, fn);
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if (__glibc_unlikely (!isfinite (z) || z == M_LIT (0.0)))
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{
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if (isnan (z))
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{
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if (!isnan (x) && !isnan (fn))
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__set_errno (EDOM);
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}
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else if (isinf (z))
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{
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if (!isinf (x) && !isinf (fn))
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__set_errno (ERANGE);
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}
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else
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{
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/* z == 0. */
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if (x != M_LIT (0.0) && !isinf (fn))
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__set_errno (ERANGE);
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}
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}
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return z;
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}
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/* Don't provide _FloatN aliases for scalb which is a deprecated interface,
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was obsolescent in POSIX.1-2001, removed in POSIX.1-2008, never made to
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C standard. */
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#undef libm_alias_float_other_r
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#define libm_alias_float_other_r(from, to, r)
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#undef libm_alias_double_other_r
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#define libm_alias_double_other_r(from, to, r)
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#undef libm_alias_ldouble_other_r
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#define libm_alias_ldouble_other_r(from, to, r)
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#undef libm_alias_float128_other_r
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#define libm_alias_float128_other_r(from, to, r)
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declare_mgen_alias (__scalb, scalb);
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#endif /* __USE_WRAPPER_TEMPLATE. */
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