diff options
| author | Ulrich Drepper <drepper@redhat.com> | 1999-07-28 22:39:04 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1999-07-28 22:39:04 +0000 |
| commit | b113c12c350c29a0f7f06fba12f06d86e79de1f4 (patch) | |
| tree | b42569c0a1afb8ea9358239ceecb64834c6c038d /misc/efgcvt.c | |
| parent | aa847ee5a48c4dc582960b1ee575a82cab005a01 (diff) | |
Update.
1999-07-28 Ulrich Drepper <drepper@cygnus.com>
* misc/efgcvt.c: Use IEEE 854 formula to compute the number of digits
to print.
* misc/efgcvt_r.c: Likewise.
* misc/qefgcvt.c: Likewise.
* misc/qefgcvt_r.c: Likewise.
* misc/tst-efgcvt.c: Remove one test which cannot reliably be run
anymore.
Diffstat (limited to 'misc/efgcvt.c')
| -rw-r--r-- | misc/efgcvt.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/misc/efgcvt.c b/misc/efgcvt.c index 9348914ff2..dc711c63dc 100644 --- a/misc/efgcvt.c +++ b/misc/efgcvt.c @@ -17,6 +17,7 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <math.h> #include <stdio.h> #include <stdlib.h> #include <sys/param.h> @@ -29,8 +30,13 @@ # define FLOAT_FMT_FLAG /* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we don't have log10 available in the preprocessor. */ -# define MAXDIG (DBL_DIG + 3) -# define NDIGIT_MAX DBL_DIG +# define MAXDIG (NDIGIT_MAX + 3) +# if DBL_MANT_DIG == 53 +# define NDIGIT_MAX 17 +# else +/* See IEEE 854 5.6, table 2 for this formula. */ +# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0))) +# endif #endif #define APPEND(a, b) APPEND2 (a, b) |