| /** |
| * This file has no copyright assigned and is placed in the Public Domain. |
| * This file is part of the w64 mingw-runtime package. |
| * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| */ |
| /* |
| Contributed by Danny Smith |
| 2005-01-04 |
| */ |
| |
| #include <math.h> |
| #include <complex.h> |
| #include <errno.h> |
| |
| |
| /* ctan (x + I * y) = (sin (2 * x) + I * sinh(2 * y)) |
| / (cos (2 * x) + cosh (2 * y)) */ |
| |
| long double complex ctanl (long double complex Z) |
| { |
| long double complex Res; |
| long double two_I = 2.0L * __imag__ Z; |
| long double two_R = 2.0L * __real__ Z; |
| long double denom = cosl (two_R) + coshl (two_I); |
| if (denom == 0.0L) |
| { |
| errno = ERANGE; |
| __real__ Res = HUGE_VALL; |
| __imag__ Res = HUGE_VALL; |
| } |
| else if (isinf (denom)) |
| { |
| errno = ERANGE; |
| __real__ Res = 0.0; |
| __imag__ Res = two_I > 0 ? 1.0L : -1.0L; |
| } |
| else |
| { |
| __real__ Res = sinl (two_R) / denom; |
| __imag__ Res = sinhl (two_I) / denom; |
| } |
| return Res; |
| } |
| |