// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math

/*
	Floating-point arctangent.
*/

// The original C code, the long comment, and the constants below were
// from http://netlib.sandia.gov/cephes/cmath/atan.c, available from
// http://www.netlib.org/cephes/cmath.tgz.
// The go code is a version of the original C.
//
// atan.c
// Inverse circular tangent (arctangent)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math

/*
	Floating-point tangent.
*/

// The original C code, the long comment, and the constants
// below were from http://netlib.sandia.gov/cephes/cmath/sin.c,
// available from http://www.netlib.org/cephes/cmath.tgz.
// The go code is a simplified version of the original C.
//
//      tan.c
//
//      Circular tangent

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math

/*
	Floating-point sine and cosine.
*/

// The original C code, the long comment, and the constants
// below were from http://netlib.sandia.gov/cephes/cmath/sin.c,
// available from http://www.netlib.org/cephes/cmath.tgz.
// The go code is a simplified version of the original C.
//
//      sin.c
//

}

func openNetnsInRoot(hostMountsPath string) func(nspath string) (NetnsCloser, error) {
	return func(nspath string) (NetnsCloser, error) {
		nspathInContainer := filepath.Join(hostMountsPath, nspath)
		ns, err := OpenNetns(nspathInContainer)
		if err != nil {
			err = fmt.Errorf("failed to open netns: %w. Make sure that the netns host path %s is mounted in under %s in the container", err, nspath, hostMountsPath)
			log.Error(err.Error())
		}

	}
}

static void
matchprint(regmatch_t* match, int nmatch, int nsub, char* ans, unsigned long test)
{
	int	i;

	for (; nmatch > nsub + 1; nmatch--)
		if ((match[nmatch-1].rm_so != -1 || match[nmatch-1].rm_eo != -1) && (!(test & TEST_IGNORE_POSITION) || match[nmatch-1].rm_so >= 0 && match[nmatch-1].rm_eo >= 0))
			break;
	for (i = 0; i < nmatch; i++)
	{
		printf("(");
		matchoffprint(match[i].rm_so);

		t.Fatal(err)
	}
	mpath := filepath.Join(mdir, "covmeta.xxx")
	incfg := writePkgConfig(t, instdir, tag, ppath, pname, gran, mpath)
	_, _, errmsg := runPkgCover(t, instdir, tag, incfg, mode,
		pkg1files, false)
	if errmsg != "" {
		t.Fatalf("runPkgCover err: %q", errmsg)
	}

	// Check for existence of meta-data file.
	if inf, err := os.Open(mpath); err != nil {

}

func inodeForFd(n NetnsFd) (uint64, error) {
	stats := &unix.Stat_t{}
	err := unix.Fstat(int(n.Fd()), stats)
	return stats.Ino, err
}

func OpenNetns(nspath string) (NetnsCloser, error) {
	n, err := netns.GetNS(nspath)
	if err != nil {
		return nil, err
	}
	i, err := inodeForFd(n)
	if err != nil {
		n.Close()
		return nil, err
	}
	return &NetnsWrapper{innerNetns: n, inode: i}, nil
}

func ExampleExpm1() {
	fmt.Printf("%.6f\n", math.Expm1(0.01))
	fmt.Printf("%.6f\n", math.Expm1(-1))
	// Output:
	// 0.010050
	// -0.632121
}

func ExampleTrunc() {
	fmt.Printf("%.2f\n", math.Trunc(math.Pi))
	fmt.Printf("%.2f\n", math.Trunc(-1.2345))
	// Output:
	// 3.00
	// -1.00
}

func ExampleCbrt() {
	fmt.Printf("%.2f\n", math.Cbrt(8))
	fmt.Printf("%.2f\n", math.Cbrt(27))
	// Output:
	// 2.00

		t.Errorf("d9 <= d1 returned true")
	}
	if math.NaN() == math.NaN() {
		t.Errorf("math.NaN() == math.NaN() returned true")
	}
	if math.NaN() >= math.NaN() {
		t.Errorf("math.NaN() >= math.NaN() returned true")
	}
	if math.NaN() <= math.NaN() {
		t.Errorf("math.NaN() <= math.NaN() returned true")
	}
	if math.Copysign(math.NaN(), -1) < math.NaN() {
		t.Errorf("math.Copysign(math.NaN(), -1) < math.NaN() returned true")
	}

	in   float64 // used for error messages, not an input
	got  float64
}{
	{"sqrtNaN", math.NaN(), math.Sqrt(math.NaN())},
	{"sqrtNegative", -1, math.Sqrt(-1)},
	{"sqrtNegInf", math.Inf(-1), math.Sqrt(math.Inf(-1))},
}

func TestSqrtConst(t *testing.T) {
	for _, test := range tests {
		if test.got != test.want {
			t.Errorf("%s: math.Sqrt(%f): got %f, want %f\n", test.name, test.in, test.got, test.want)
		}
	}