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authorUlrich Drepper <drepper@redhat.com>2009-08-24 12:06:55 -0700
committerUlrich Drepper <drepper@redhat.com>2009-08-24 12:06:55 -0700
commitf0c281e072fd324261a51558284c04e230c0178d (patch)
tree1934177724689ef72853bdb7490648034eef7cb1 /math/s_fdim.c
parent7b943af6cf2bfd4b94be271877a10128c32d03da (diff)
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Fix overflow handling in fdim.
Diffstat (limited to 'math/s_fdim.c')
-rw-r--r--math/s_fdim.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/math/s_fdim.c b/math/s_fdim.c
index 5804e63..677fdcd 100644
--- a/math/s_fdim.c
+++ b/math/s_fdim.c
@@ -1,5 +1,5 @@
/* Return positive difference between arguments.
- Copyright (C) 1997, 2004 Free Software Foundation, Inc.
+ Copyright (C) 1997, 2004, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@@ -18,6 +18,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+#include <errno.h>
#include <math.h>
double
@@ -31,7 +32,14 @@ __fdim (double x, double y)
/* Raise invalid flag. */
return x - y;
- return x <= y ? 0 : x - y;
+ if (x <= y)
+ return 0.0;
+
+ double r = x - y;
+ if (fpclassify (r) == FP_INFINITE)
+ __set_errno (ERANGE);
+
+ return r;
}
weak_alias (__fdim, fdim)
#ifdef NO_LONG_DOUBLE