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Fix overflow handling in fdim.

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This commit is contained in:
Ulrich Drepper
2009-08-24 12:06:55 -07:00
parent 7b943af6cf
commit f0c281e072
4 changed files with 36 additions and 8 deletions
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12
math/s_fdim.c
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@ -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