3 files changed, 12 insertions, 6 deletions
diff --git a/sysdeps/generic/s_cproj.c b/sysdeps/generic/s_cproj.c
index fb50bb5a88..f126bbe055 100644
--- a/sysdeps/generic/s_cproj.c
+++ b/sysdeps/generic/s_cproj.c
@@ -1,5 +1,5 @@
 /* Compute projection of complex double value to Riemann sphere.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -27,7 +27,9 @@ __cproj (__complex__ double x)
 {
   __complex__ double res;
 
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+  if (isnan (__real__ x) && isnan (__imag__ x))
+    return x;
+  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
     {
       __real__ res = INFINITY;
       __imag__ res = __copysign (0.0, __imag__ x);
diff --git a/sysdeps/generic/s_cprojf.c b/sysdeps/generic/s_cprojf.c
index b90590835c..6ec8b66001 100644
--- a/sysdeps/generic/s_cprojf.c
+++ b/sysdeps/generic/s_cprojf.c
@@ -1,5 +1,5 @@
 /* Compute projection of complex float value to Riemann sphere.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -27,7 +27,9 @@ __cprojf (__complex__ float x)
 {
   __complex__ float res;
 
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+  if (isnan (__real__ x) && isnan (__imag__ x))
+    return x;
+  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
     {
       __real__ res = INFINITY;
       __imag__ res = __copysignf (0.0, __imag__ x);
diff --git a/sysdeps/generic/s_cprojl.c b/sysdeps/generic/s_cprojl.c
index 13da4b417d..cac0407926 100644
--- a/sysdeps/generic/s_cprojl.c
+++ b/sysdeps/generic/s_cprojl.c
@@ -1,5 +1,5 @@
 /* Compute projection of complex long double value to Riemann sphere.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -27,7 +27,9 @@ __cprojl (__complex__ long double x)
 {
   __complex__ long double res;
 
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+  if (isnan (__real__ x) && isnan (__imag__ x))
+    return x;
+  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
     {
       __real__ res = INFINITY;
       __imag__ res = __copysignl (0.0, __imag__ x);