Test cases for printf of double overflows. (CVS 1260)

FossilOrigin-Name: 96a6d2d3ff5bd0aaff188ee1c5e2f02cbea435b2

1 files changed, 5 insertions, 6 deletions

diff --git a/src/printf.c b/src/printf.c
index d0785d1d7..3cd794280 100644
--- a/src/printf.c
+++ b/src/printf.c
@@ -411,12 +411,11 @@ static int vxprintf(
         /* Normalize realvalue to within 10.0 > realvalue >= 1.0 */
         exp = 0;
         if( realvalue>0.0 ){
-          int k = 0;
-          while( realvalue>=1e8 && k++<100 ){ realvalue *= 1e-8; exp+=8; }
-          while( realvalue>=10.0 && k++<100 ){ realvalue *= 0.1; exp++; }
-          while( realvalue<1e-8 && k++<100 ){ realvalue *= 1e8; exp-=8; }
-          while( realvalue<1.0 && k++<100 ){ realvalue *= 10.0; exp--; }
-          if( k>=100 ){
+          while( realvalue>=1e8 && exp<=350 ){ realvalue *= 1e-8; exp+=8; }
+          while( realvalue>=10.0 && exp<=350 ){ realvalue *= 0.1; exp++; }
+          while( realvalue<1e-8 && exp>=-350 ){ realvalue *= 1e8; exp-=8; }
+          while( realvalue<1.0 && exp>=-350 ){ realvalue *= 10.0; exp--; }
+          if( exp>350 || exp<-350 ){
             bufpt = "NaN";
             length = 3;
             break;