diff options
Diffstat (limited to 'misc/qefgcvt.c')
| -rw-r--r-- | misc/qefgcvt.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/misc/qefgcvt.c b/misc/qefgcvt.c index af65fc1688..faf788aa5d 100644 --- a/misc/qefgcvt.c +++ b/misc/qefgcvt.c @@ -17,13 +17,20 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <float.h> + #define FLOAT_TYPE long double #define FUNC_PREFIX q #define FLOAT_FMT_FLAG "L" /* Actually we have to write (LDBL_DIG + log10 (LDBL_MAX_10_EXP)) but we don't have log10 available in the preprocessor. Since we cannot assume anything on the used `long double' format be generous. */ -#define MAXDIG (LDBL_DIG + 12) -#define NDIGIT_MAX LDBL_DIG +#define MAXDIG (NDIGIT_MAX + 12) +#if LDBL_MANT_DIG == 64 +# define NDIGIT_MAX 21 +#else +/* See IEEE 854 5.6, table 2 for this formula. */ +# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0))) +#endif #include "efgcvt.c" |