* sysdeps/generic/s_ctan.c (__ctan): Likewise.

	* sysdeps/generic/s_ctanf.c (__ctanf): Likewise.
	* sysdeps/generic/s_ctanl.c (__ctanl): Likewise.

diff --git a/ChangeLog b/ChangeLog
index 6c5daee..6f7ec2d 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,9 @@
        * sysdeps/generic/s_ctanh.c (__ctanh): Handle case of zero den better.
        * sysdeps/generic/s_ctanhf.c (__ctanhf): Likewise.
        * sysdeps/generic/s_ctanhl.c (__ctanhl): Likewise.
+       * sysdeps/generic/s_ctan.c (__ctan): Likewise.
+       * sysdeps/generic/s_ctanf.c (__ctanf): Likewise.
+       * sysdeps/generic/s_ctanl.c (__ctanl): Likewise.
 
 2005-04-13  H.J. Lu  <hongjiu.lu@intel.com>
 

diff --git a/sysdeps/generic/s_ctan.c b/sysdeps/generic/s_ctan.c
index 6a09fe4..0464ab8 100644 (file)
--- a/sysdeps/generic/s_ctan.c
+++ b/sysdeps/generic/s_ctan.c
@@ -1,5 +1,5 @@
 /* Complex tangent function for double.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -61,8 +61,18 @@ __ctan (__complex__ double x)
 
       den = cos2rx + __ieee754_cosh (2.0 * __imag__ x);
 
-      __real__ res = sin2rx / den;
-      __imag__ res = __ieee754_sinh (2.0 * __imag__ x) / den;
+      if (den == 0.0)
+       {
+         __complex__ double ez = __cexp (1.0i * x);
+         __complex__ double emz = __cexp (-1.0i * x);
+
+         res = (ez - emz) / (ez + emz) * -1.0i;
+       }
+      else
+       {
+         __real__ res = sin2rx / den;
+         __imag__ res = __ieee754_sinh (2.0 * __imag__ x) / den;
+       }
     }
 
   return res;

diff --git a/sysdeps/generic/s_ctanf.c b/sysdeps/generic/s_ctanf.c
index e02971d..58d9d13 100644 (file)
--- a/sysdeps/generic/s_ctanf.c
+++ b/sysdeps/generic/s_ctanf.c
@@ -1,5 +1,5 @@
 /* Complex tangent function for float.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -61,8 +61,19 @@ __ctanf (__complex__ float x)
 
       den = cos2rx + __ieee754_coshf (2.0 * __imag__ x);
 
-      __real__ res = sin2rx / den;
-      __imag__ res = __ieee754_sinhf (2.0 * __imag__ x) / den;
+
+      if (den == 0.0)
+       {
+         __complex__ float ez = __cexpf (1.0i * x);
+         __complex__ float emz = __cexpf (-1.0i * x);
+
+         res = (ez - emz) / (ez + emz) * -1.0i;
+       }
+      else
+       {
+         __real__ res = sin2rx / den;
+         __imag__ res = __ieee754_sinhf (2.0 * __imag__ x) / den;
+       }
     }
 
   return res;

diff --git a/sysdeps/generic/s_ctanl.c b/sysdeps/generic/s_ctanl.c
index fa153e9..89379a5 100644 (file)
--- a/sysdeps/generic/s_ctanl.c
+++ b/sysdeps/generic/s_ctanl.c
@@ -1,5 +1,5 @@
 /* Complex tangent function for long double.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -61,8 +61,19 @@ __ctanl (__complex__ long double x)
 
       den = cos2rx + __ieee754_coshl (2.0 * __imag__ x);
 
-      __real__ res = sin2rx / den;
-      __imag__ res = __ieee754_sinhl (2.0 * __imag__ x) / den;
+
+      if (den == 0.0)
+       {
+         __complex__ long double ez = __cexpl (1.0i * x);
+         __complex__ long double emz = __cexpl (-1.0i * x);
+
+         res = (ez - emz) / (ez + emz) * -1.0i;
+       }
+      else
+       {
+         __real__ res = sin2rx / den;
+         __imag__ res = __ieee754_sinhl (2.0 * __imag__ x) / den;
+       }
     }
 
   return res;