elf: Ignore loader debug env vars for setuid
[glibc.git] / math / w_scalbf_compat.c
blob4074e981428de93e278c93b96059e0430336fab0
1 /* Copyright (C) 2011-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
18 #include <errno.h>
19 #include <math.h>
20 #include <math_private.h>
21 #include <math-svid-compat.h>
24 #if LIBM_SVID_COMPAT
25 static float
26 __attribute__ ((noinline))
27 sysv_scalbf (float x, float fn)
29 float z = __ieee754_scalbf (x, fn);
31 if (__glibc_unlikely (isinf (z)))
33 if (isfinite (x))
34 return __kernel_standard_f (x, fn, 132); /* scalb overflow */
35 else
36 __set_errno (ERANGE);
38 else if (__builtin_expect (z == 0.0f, 0) && z != x)
39 return __kernel_standard_f (x, fn, 133); /* scalb underflow */
41 return z;
45 /* Wrapper scalbf */
46 float
47 __scalbf (float x, float fn)
49 if (__glibc_unlikely (_LIB_VERSION == _SVID_))
50 return sysv_scalbf (x, fn);
51 else
53 float z = __ieee754_scalbf (x, fn);
55 if (__glibc_unlikely (!isfinite (z) || z == 0.0f))
57 if (isnan (z))
59 if (!isnan (x) && !isnan (fn))
60 __set_errno (EDOM);
62 else if (isinf (z))
64 if (!isinf (x) && !isinf (fn))
65 __set_errno (ERANGE);
67 else
69 /* z == 0. */
70 if (x != 0.0f && !isinf (fn))
71 __set_errno (ERANGE);
74 return z;
77 weak_alias (__scalbf, scalbf)
78 #endif