diff options
Diffstat (limited to 'math/s_fdim.c')
| -rw-r--r-- | math/s_fdim.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/math/s_fdim.c b/math/s_fdim.c index 5804e631c3..677fdcde1a 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 |