1 files changed, 37 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/complex/cacosh.c b/winsup/mingw/mingwex/complex/cacosh.c
new file mode 100644
index 000000000..34469cb56
--- /dev/null
+++ b/winsup/mingw/mingwex/complex/cacosh.c
@@ -0,0 +1,37 @@
+/*
+   cacosh.c
+   Contributed by Danny Smith
+   2003-10-20
+*/
+
+#include <math.h>
+#include <complex.h>
+
+#if 0
+/* cacosh (z) = I * cacos (z)  */
+double complex cacosh (double complex Z)
+{
+  double complex Tmp;
+  double complex Res;
+
+  Tmp = cacos (Z);
+  __real__ Res = -__imag__ Tmp;
+  __imag__ Res = __real__ Tmp;
+  return Res;
+}
+
+#else
+
+/* cacosh (z) = I * cacos (z) = I * (pi/2 - casin (z))  */
+
+double complex cacosh (double complex Z)
+{
+  double complex Tmp;
+  double complex Res;
+
+  Tmp = casin (Z);
+  __real__ Res = __imag__ Tmp;
+  __imag__ Res =  M_PI_2 - __real__ Tmp;
+  return Res;
+}
+#endif