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authorUlrich Drepper <drepper@redhat.com>1999-07-28 22:39:04 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-28 22:39:04 +0000
commitb113c12c350c29a0f7f06fba12f06d86e79de1f4 (patch)
treeb42569c0a1afb8ea9358239ceecb64834c6c038d /misc/efgcvt.c
parentaa847ee5a48c4dc582960b1ee575a82cab005a01 (diff)
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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.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/misc/efgcvt.c b/misc/efgcvt.c
index 9348914..dc711c6 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)