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# define TGSOURCE "complex/ctanh.c"
#include "_tgmath.h"
#include <complex.h>
#include <math.h>
#include <fenv.h>
TYPE complex TGFN(ctanh)(TYPE complex z)
{
int classr = fpclassify(TGFN(creal)(z));
int classi = fpclassify(TGFN(cimag)(z));
//int signr = signbit(TGFN(creal)(z));
int signi = signbit(TGFN(cimag)(z));
if (classr == FP_ZERO && classi == FP_ZERO) {
return TGCMPLX(0.0, 0.0);
}
if (classr == FP_ZERO && classi == FP_INFINITE) {
feraiseexcept(FE_INVALID);
return TGCMPLX(0.0, NAN);
}
if (classr != FP_INFINITE && classr != FP_ZERO && classi == FP_INFINITE) {
feraiseexcept(FE_INVALID);
return TGCMPLX(NAN, NAN);
}
if (classr == FP_ZERO && classi == FP_NAN) {
return TGCMPLX(0.0, NAN);
}
if (classr != FP_INFINITE && classr != FP_ZERO && classi == FP_NAN) {
feraiseexcept(FE_INVALID);
return TGCMPLX(NAN, NAN);
}
if (classr == FP_INFINITE && classi != FP_INFINITE && !signi) {
TYPE y = TGFN(cimag)(z);
/* FIXME: this is surely a typo in C18 */
return TGCMPLX(1.0, 0 * TGFN(sin)(2 * y));
}
if (classr == FP_INFINITE && classi == FP_INFINITE) {
return TGCMPLX(1.0, 0.0);
}
if (classr == FP_INFINITE && classi == FP_NAN) {
return TGCMPLX(1.0, 0.0);
}
if (classr == FP_NAN && classi == FP_ZERO) {
return TGCMPLX(NAN, 0.0);
}
if (classr == FP_NAN && classi != FP_INFINITE && classi != FP_ZERO) {
feraiseexcept(FE_INVALID);
return TGCMPLX(NAN, NAN);
}
if (classr == FP_NAN && classi == FP_NAN) {
return TGCMPLX(NAN, NAN);
}
return z;
}
/*d
The ctanh functions compute the complex hyperbolic tangent of z.
d*/
/*r
The ctanh functions return the complex hyperbolic tangent value.
r*/
/*
STDC(199901)
LINK(m)
*/
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