(__gmp_doprnt_mpf): For DOPRNT_CONV_FIXED, ask for one more digit.

1 files changed, 4 insertions, 2 deletions

diff --git a/printf/doprntf.c b/printf/doprntf.c
index 6ddb58590..49e701304 100644
--- a/printf/doprntf.c
+++ b/printf/doprntf.c
@@ -90,8 +90,10 @@ __gmp_doprnt_mpf (const struct doprnt_funs_t *funs,
 	   overestimate the integer part, and add prec.  If f<1 then
 	   underestimate the zeros between the radix point and the first
 	   digit and subtract that from prec.  In either case add 2 so the
-	   round to nearest can be applied accurately.  */
-	ndigits = prec + 2
+	   round to nearest can be applied accurately.  Finally, we add 1 to
+	   handle the case of 1-eps where EXP(f) = 0 but mpf_get_str returns
+	   exp as 1.  */
+	ndigits = prec + 2 + 1
 	  + EXP(f) * (mp_bases[ABS(p->base)].chars_per_limb + (EXP(f)>=0));
 	ndigits = MAX (ndigits, 1);
 	break;