Implement C99's standard header <tgmath.h>. It provides type-generic macros

for the <math.h> and <complex.h> functions that have float, double and long
double implementations.  Such type-generic macros expand to an actual
function, depending on the types of the macro arguments, eg. if <tgmath.h>
is included, the invocation cos(1.0f) calls the function cosf().

include/Makefile

@@ -16,7 +16,8 @@ INCS=	a.out.h ar.h assert.h bitstring.h complex.h cpio.h ctype.h db.h \
 	pthread_np.h pwd.h ranlib.h readpassphrase.h regex.h regexp.h \
 	resolv.h rune.h runetype.h search.h setjmp.h sgtty.h signal.h stab.h \
 	stdbool.h stddef.h stdio.h stdlib.h string.h stringlist.h \
-	strings.h sysexits.h tar.h time.h timeconv.h timers.h ttyent.h \
+	strings.h sysexits.h tar.h tgmath.h \
+	time.h timeconv.h timers.h ttyent.h \
 	ulimit.h unistd.h utime.h utmp.h uuid.h varargs.h vis.h wchar.h \
 	wctype.h wordexp.h
 

include/tgmath.h

@@ -0,0 +1,166 @@
+/*-
+ * Copyright (c) 2004 Stefan Farfeleder.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _TGMATH_H_
+#define	_TGMATH_H_
+
+#include <complex.h>
+#include <math.h>
+
+/*
+ * This implementation of <tgmath.h> requires two implementation-dependent
+ * macros to be defined:
+ * __tg_impl_simple(x, y, z, fn, fnf, fnl, ...)
+ *	Invokes fnl() if the corresponding real type of x, y or z is long
+ *	double, fn() if it is double or any has an integer type, and fnf()
+ *	otherwise.
+ * __tg_impl_full(x, y, z, fn, fnf, fnl, cfn, cfnf, cfnl, ...)
+ *	Invokes [c]fnl() if the corresponding real type of x, y or z is long
+ *	double, [c]fn() if it is double or any has an integer type, and
+ *	[c]fnf() otherwise.  The function with the 'c' prefix is called if
+ *	any of x, y or z is a complex number.
+ * Both macros call the chosen function with all additional arguments passed
+ * to them, as given by __VA_ARGS__.
+ *
+ * Note that these macros cannot be implemented with C's ?: operator,
+ * because the return type of the whole expression would incorrectly be long
+ * double complex regardless of the argument types.
+ */
+
+#if __GNUC_PREREQ__(3, 1)
+#define	__tg_type(e, t)	__builtin_types_compatible_p(__typeof__(e), t)
+#define	__tg_type3(e1, e2, e3, t)					\
+	(__tg_type(e1, t) || __tg_type(e2, t) || __tg_type(e3, t))
+#define	__tg_type_corr(e1, e2, e3, t)					\
+	(__tg_type3(e1, e2, e3, t) || __tg_type3(e1, e2, e3, t complex))
+#define	__tg_integer(e1, e2, e3)					\
+	(((__typeof__(e1))1.5 == 1) || ((__typeof__(e2))1.5 == 1) ||	\
+	    ((__typeof__(e3))1.5 == 1))
+#define	__tg_is_complex(e1, e2, e3)					\
+	(__tg_type3(e1, e2, e3, float complex) ||			\
+	    __tg_type3(e1, e2, e3, double complex) ||			\
+	    __tg_type3(e1, e2, e3, long double complex))
+
+#define	__tg_impl_simple(x, y, z, fn, fnf, fnl, ...)			\
+	__builtin_choose_expr(__tg_type_corr(x, y, z, long double),	\
+	    fnl(__VA_ARGS__), __builtin_choose_expr(			\
+		__tg_type_corr(x, y, z, double) || __tg_integer(x, y, z),\
+		fn(__VA_ARGS__), fnf(__VA_ARGS__)))
+
+#define	__tg_impl_full(x, y, z, fn, fnf, fnl, cfn, cfnf, cfnl, ...)	\
+	__builtin_choose_expr(__tg_is_complex(x, y, z),			\
+	    __tg_impl_simple(x, y, z, cfn, cfnf, cfnl, __VA_ARGS__),	\
+	    __tg_impl_simple(x, y, z, fn, fnf, fnl, __VA_ARGS__))
+
+#else	/* __GNUC__ */
+#error "<tgmath.h> not implemented for this compiler"
+#endif	/* !__GNUC__ */
+
+/* Macros to save lots of repetition below */
+#define	__tg_simple(x, fn)						\
+	__tg_impl_simple(x, x, x, fn, fn##f, fn##l, x)
+#define	__tg_simple2(x, y, fn)						\
+	__tg_impl_simple(x, x, y, fn, fn##f, fn##l, x, y)
+#define	__tg_simplev(x, fn, ...)					\
+	__tg_impl_simple(x, x, x, fn, fn##f, fn##l, __VA_ARGS__)
+#define	__tg_full(x, fn)						\
+	__tg_impl_full(x, x, x, fn, fn##f, fn##l, c##fn, c##fn##f, c##fn##l, x)
+
+/* 7.22#4 -- These macros expand to real or complex functions, depending on
+ * the type of their arguments. */
+#define	acos(x)		__tg_full(x, acos)
+#define	asin(x)		__tg_full(x, asin)
+#define	atan(x)		__tg_full(x, atan)
+#define	acosh(x)	__tg_full(x, acosh)
+#define	asinh(x)	__tg_full(x, asinh)
+#define	atanh(x)	__tg_full(x, atanh)
+#define	cos(x)		__tg_full(x, cos)
+#define	sin(x)		__tg_full(x, sin)
+#define	tan(x)		__tg_full(x, tan)
+#define	cosh(x)		__tg_full(x, cosh)
+#define	sinh(x)		__tg_full(x, sinh)
+#define	tanh(x)		__tg_full(x, tanh)
+#define	exp(x)		__tg_full(x, exp)
+#define	log(x)		__tg_full(x, log)
+#define	pow(x, y)	__tg_impl_full(x, x, y, pow, powf, powl,	\
+			    cpow, cpowf, cpowl, x, y)
+#define	sqrt(x)		__tg_full(x, sqrt)
+
+/* "The corresponding type-generic macro for fabs and cabs is fabs." */
+#define	fabs(x)		__tg_impl_full(x, x, x, fabs, fabsf, fabsl,	\
+    			    cabs, cabsf, cabsl, x)
+
+/* 7.22#5 -- These macros are only defined for arguments with real type. */
+#define	atan2(x, y)	__tg_simple2(x, y, atan2)
+#define	cbrt(x)		__tg_simple(x, cbrt)
+#define	ceil(x)		__tg_simple(x, ceil)
+#define	copysign(x, y)	__tg_simple2(x, y, copysign)
+#define	erf(x)		__tg_simple(x, erf)
+#define	erfc(x)		__tg_simple(x, erfc)
+#define	exp2(x)		__tg_simple(x, exp2)
+#define	expm1(x)	__tg_simple(x, expm1)
+#define	fdim(x, y)	__tg_simple2(x, y, fdim)
+#define	floor(x)	__tg_simple(x, floor)
+#define	fma(x, y, z)	__tg_impl_simple(x, y, z, fma, fmaf, fmal, x, y, z)
+#define	fmax(x, y)	__tg_simple2(x, y, fmax)
+#define	fmin(x, y)	__tg_simple2(x, y, fmin)
+#define	fmod(x, y)	__tg_simple2(x, y, fmod)
+#define	frexp(x, y)	__tg_simplev(x, frexp, x, y)
+#define	hypot(x, y)	__tg_simple2(x, y, hypot)
+#define	ilogb(x)	__tg_simple(x, ilogb)
+#define	ldexp(x, y)	__tg_simplev(x, ldexp, x, y)
+#define	lgamma(x)	__tg_simple(x, lgamma)
+#define	llrint(x)	__tg_simple(x, llrint)
+#define	llround(x)	__tg_simple(x, llround)
+#define	log10(x)	__tg_simple(x, log10)
+#define	log1p(x)	__tg_simple(x, log1p)
+#define	log2(x)		__tg_simple(x, log2)
+#define	logb(x)		__tg_simple(x, logb)
+#define	lrint(x)	__tg_simple(x, lrint)
+#define	lround(x)	__tg_simple(x, lround)
+#define	nextbyint(x)	__tg_simple(x, nextbyint)
+#define	nextafter(x, y)	__tg_simple2(x, y, nextafter)
+#define	nexttoward(x, y) __tg_simplev(x, nexttoward, x, y)
+#define	remainder(x, y)	__tg_simple2(x, y, remainder)
+#define	remquo(x, y, z)	__tg_impl_simple(x, x, y, remquo, remquof,	\
+			    remquol, x, y, z)
+#define	rint(x)		__tg_simple(x, rint)
+#define	round(x)	__tg_simple(x, round)
+#define	scalbn(x, y)	__tg_simplev(x, scalbn, x, y)
+#define	scalbln(x, y)	__tg_simplev(x, scalbln, x, y)
+#define	tgamma(x)	__tg_simple(x, tgamma)
+#define	trunc(x)	__tg_simple(x, trunc)
+
+/* 7.22#6 -- These macros always expand to complex functions. */
+#define	carg(x)		__tg_simple(x, carg)
+#define	cimag(x)	__tg_simple(x, cimag)
+#define	conj(x)		__tg_simple(x, conj)
+#define	cproj(x)	__tg_simple(x, cproj)
+#define	creal(x)	__tg_simple(x, creal)
+
+#endif /* !_TGMATH_H_ */