Index: uspace/lib/c/include/math.h
===================================================================
--- uspace/lib/c/include/math.h	(revision 3012ae777ffbbbecfe02f17eb2a456c88726797c)
+++ uspace/lib/c/include/math.h	(revision 3012ae777ffbbbecfe02f17eb2a456c88726797c)
@@ -0,0 +1,321 @@
+/*
+ * Copyright (c) 2018 CZ.NIC, z.s.p.o.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MATH_H
+#define _MATH_H
+
+#include <limits.h>
+#include <stddef.h>
+#include <float.h>
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_HELENOS_SOURCE)
+
+#define M_E         2.7182818284590452354
+#define M_LOG2E     1.4426950408889634074
+#define M_LOG10E    0.43429448190325182765
+#define M_LN2       0.69314718055994530942
+#define M_LN10      2.30258509299404568402
+#define M_PI        3.14159265358979323846
+#define M_PI_2      1.57079632679489661923
+#define M_PI_4      0.78539816339744830962
+#define M_1_PI      0.31830988618379067154
+#define M_2_PI      0.63661977236758134308
+#define M_2_SQRTPI  1.12837916709551257390
+#define M_SQRT2     1.41421356237309504880
+#define M_SQRT1_2   0.70710678118654752440
+
+#endif
+
+#if FLT_EVAL_METHOD == 0
+typedef float float_t;
+typedef double double_t;
+#elif FLT_EVAL_METHOD == 1
+typedef double float_t;
+typedef double double_t;
+#elif FLT_EVAL_METHOD == 2
+typedef long double float_t;
+typedef long double double_t;
+#else
+#error Unknown FLT_EVAL_METHOD value.
+#endif
+
+#define FP_ILOGB0    INT_MIN
+#define FP_ILOGBNAN  INT_MAX
+
+#define FP_NAN        0
+#define FP_INFINITE   1
+#define FP_NORMAL     2
+#define FP_SUBNORMAL  3
+#define FP_ZERO       4
+
+int __fpclassify(size_t, ...);
+int __signbit(size_t, ...);
+int __fcompare(size_t, size_t, ...);
+
+#define __FCOMPARE_EQUAL    1
+#define __FCOMPARE_LESS     2
+#define __FCOMPARE_GREATER  4
+
+#if defined(__GNUC__) || defined(__clang__)
+
+#define HUGE_VALF  __builtin_huge_valf()
+#define HUGE_VAL   __builtin_huge_val()
+#define HUGE_VALL  __builtin_huge_vall()
+#define INFINITY   __builtin_inff()
+#define NAN        __builtin_nan("")
+
+#define fpclassify(x)  __builtin_fpclassify(FP_NAN, FP_INFINITE, FP_NORMAL, FP_SUBNORMAL, FP_ZERO, (x))
+#define isfinite(x)    __builtin_isfinite(x)
+#define isinf(x)       __builtin_isinf(x)
+#define isnan(x)       __builtin_isnan(x)
+#define isnormal(x)    __builtin_isnormal(x)
+#define signbit(x)     __builtin_signbit(x)
+
+#define isgreater(x, y)      __builtin_isgreater(x, y)
+#define isgreaterequal(x, y) __builtin_isgreaterequal(x, y)
+#define isless(x, y)         __builtin_isless(x, y)
+#define islessequal(x, y)    __builtin_islessequal(x, y)
+#define islessgreater(x, y)  __builtin_islessgreater(x, y)
+#define isunordered(x, y)    __builtin_isunordered(x, y)
+
+#else  /* defined(__GNUC__) || defined(__clang__) */
+
+#define HUGE_VALF  (1.0f / 0.0f)
+#define HUGE_VAL   (1.0 / 0.0)
+#define HUGE_VALL  (1.0l / 0.0l)
+#define INFINITY   (1.0f / 0.0f)
+#define NAN        (0.0 / 0.0)
+
+#define fpclassify(x)  __fpclassify(sizeof(x), (x))
+#define isfinite(x)    (fpclassify(x) > FP_INFINITE)
+#define isinf(x)       (fpclassify(x) == FP_INFINITE)
+#define isnan(x)       (fpclassify(x) == FP_NAN)
+#define isnormal(x)    (fpclassify(x) == FP_NORMAL)
+#define signbit(x)     __signbit(sizeof(x), (x))
+
+#define isgreater(x, y)      (!!(__fcompare(sizeof(x), sizeof(y), (x), (y)) & __FCOMPARE_GREATER))
+#define isgreaterequal(x, y) (!!(__fcompare(sizeof(x), sizeof(y), (x), (y)) & (__FCOMPARE_GREATER | __FCOMPARE_EQUAL))))
+#define isless(x, y)         (!!(__fcompare(sizeof(x), sizeof(y), (x), (y)) & __FCOMPARE_LESS))
+#define islessequal(x, y)    (!!(__fcompare(sizeof(x), sizeof(y), (x), (y)) & (__FCOMPARE_LESS | __FCOMPARE_EQUAL)))
+#define islessgreater(x, y)  (!!(__fcompare(sizeof(x), sizeof(y), (x), (y)) & (__FCOMPARE_LESS | __FCOMPARE_GREATER)))
+#define isunordered(x, y)    (!__fcompare(sizeof(x), sizeof(y), (x), (y)))
+
+#endif  /* defined(__GNUC__) || defined(__clang__) */
+
+
+#define MATH_ERRNO      1
+#define MATH_ERREXCEPT  2
+
+#define math_errhandling MATH_ERRNO
+
+double acos(double);
+float acosf(float);
+long double acosl(long double);
+double asin(double);
+float asinf(float);
+long double asinl(long double);
+double atan(double);
+float atanf(float);
+long double atanl(long double);
+double atan2(double, double);
+float atan2f(float, float);
+long double atan2l(long double, long double);
+double cos(double);
+float cosf(float);
+long double cosl(long double);
+double sin(double);
+float sinf(float);
+long double sinl(long double);
+double tan(double);
+float tanf(float);
+long double tanl(long double);
+double acosh(double);
+float acoshf(float);
+long double acoshl(long double);
+double asinh(double);
+float asinhf(float);
+long double asinhl(long double);
+double atanh(double);
+float atanhf(float);
+long double atanhl(long double);
+double cosh(double);
+float coshf(float);
+long double coshl(long double);
+double sinh(double);
+float sinhf(float);
+long double sinhl(long double);
+double tanh(double);
+float tanhf(float);
+long double tanhl(long double);
+double exp(double);
+float expf(float);
+long double expl(long double);
+double exp2(double);
+float exp2f(float);
+long double exp2l(long double);
+double expm1(double);
+float expm1f(float);
+long double expm1l(long double);
+double frexp(double, int *);
+float frexpf(float, int *);
+long double frexpl(long double, int *);
+int ilogb(double);
+int ilogbf(float);
+int ilogbl(long double);
+double ldexp(double, int);
+float ldexpf(float, int);
+long double ldexpl(long double, int);
+double log(double);
+float logf(float);
+long double logl(long double);
+double log10(double);
+float log10f(float);
+long double log10l(long double);
+double log1p(double);
+float log1pf(float);
+long double log1pl(long double);
+double log2(double);
+float log2f(float);
+long double log2l(long double);
+double logb(double);
+float logbf(float);
+long double logbl(long double);
+double modf(double value, double *);
+float modff(float value, float *);
+long double modfl(long double, long double *);
+double scalbn(double, int);
+float scalbnf(float, int);
+long double scalbnl(long double, int);
+double scalbln(double, long int);
+float scalblnf(float, long int);
+long double scalblnl(long double, long int);
+double cbrt(double);
+float cbrtf(float);
+long double cbrtl(long double);
+double fabs(double);
+float fabsf(float);
+long double fabsl(long double);
+double hypot(double, double);
+float hypotf(float, float);
+long double hypotl(long double, long double);
+double pow(double, double);
+float powf(float, float);
+long double powl(long double, long double);
+double sqrt(double);
+float sqrtf(float);
+long double sqrtl(long double);
+double erf(double);
+float erff(float);
+long double erfl(long double);
+double erfc(double);
+float erfcf(float);
+long double erfcl(long double);
+double lgamma(double);
+float lgammaf(float);
+long double lgammal(long double);
+double tgamma(double);
+float tgammaf(float);
+long double tgammal(long double);
+double ceil(double);
+float ceilf(float);
+long double ceill(long double);
+double floor(double);
+float floorf(float);
+long double floorl(long double);
+double nearbyint(double);
+float nearbyintf(float);
+long double nearbyintl(long double);
+double rint(double);
+float rintf(float);
+long double rintl(long double);
+long int lrint(double);
+long int lrintf(float);
+long int lrintl(long double);
+long long int llrint(double);
+long long int llrintf(float);
+long long int llrintl(long double);
+double round(double);
+float roundf(float);
+long double roundl(long double);
+long int lround(double);
+long int lroundf(float);
+long int lroundl(long double);
+long long int llround(double);
+long long int llroundf(float);
+long long int llroundl(long double);
+double trunc(double);
+float truncf(float);
+long double truncl(long double);
+double fmod(double, double);
+float fmodf(float, float);
+long double fmodl(long double, long double);
+double remainder(double, double);
+float remainderf(float, float);
+long double remainderl(long double, long double);
+double remquo(double, double, int *);
+float remquof(float, float, int *);
+long double remquol(long double, long double, int *);
+double copysign(double, double);
+float copysignf(float, float);
+long double copysignl(long double, long double);
+double nan(const char *);
+float nanf(const char *);
+long double nanl(const char *);
+double nextafter(double, double);
+float nextafterf(float, float);
+long double nextafterl(long double, long double);
+double nexttoward(double, long double);
+float nexttowardf(float, long double);
+long double nexttowardl(long double, long double);
+double fdim(double, double);
+float fdimf(float, float);
+long double fdiml(long double, long double);
+double fmax(double, double);
+float fmaxf(float, float);
+long double fmaxl(long double, long double);
+double fmin(double, double);
+float fminf(float, float);
+long double fminl(long double, long double);
+double fma(double, double, double);
+float fmaf(float, float, float);
+long double fmal(long double, long double, long double);
+
+#if defined(__GNUC__) || defined(__clang__)
+
+#define copysign __builtin_copysign
+#define copysignf __builtin_copysignf
+#define copysignl __builtin_copysignl
+
+#define nextafter __builtin_nextafter
+#define nextafterf __builtin_nextafterf
+#define nextafterl __builtin_nextafterl
+
+#endif
+
+#endif /* _MATH_H */
+
