Final decimal bug fix changeset (hope)

sql/field.cc:
  Code cleanup for Floating point overflow bug fix. According to Monty's comments

sql/field.cc

@@ -479,23 +479,18 @@ void Field_decimal::store(const char *from,uint len)
     else
       expo_sign_char= '+';
     /*
-     Read digits of the exponent and compute its value.
-     We must care about 'exponent' overflow, because as
-     unsigned arithmetic is "modulo", big exponents
-     will become small (e.g.
-     1e4294967296 will become 1e0, and the field
-     will finally contain 1 instead of its max possible value).
+      Read digits of the exponent and compute its value.  We must care about
+      'exponent' overflow, because as unsigned arithmetic is "modulo", big 
+      exponents will become small (e.g. 1e4294967296 will become 1e0, and the 
+      field will finally contain 1 instead of its max possible value).
     */
     for (;from!=end && isdigit(*from); from++)
     {
       exponent=10*exponent+(*from-'0');
       if (exponent>MAX_EXPONENT)
-      {
-        exponent=MAX_EXPONENT;
         break;
     }
   }
-  }
   
   /*
     We only have to generate warnings if count_cuted_fields is set.
@@ -538,8 +533,8 @@ void Field_decimal::store(const char *from,uint len)
   /* 
      Below tmp_uint cannot overflow with small enough MAX_EXPONENT setting,
      as int_digits_added_zeros<=exponent<4G and 
-     (ulonglong)(int_digits_end-int_digits_from)<=max_allowed_packet<=2G and
-     (ulonglong)(frac_digits_from-int_digits_tail_from)<=max_allowed_packet<=2G
+     (int_digits_end-int_digits_from)<=max_allowed_packet<=2G and
+     (frac_digits_from-int_digits_tail_from)<=max_allowed_packet<=2G
   */
 
   if (!expo_sign_char)
@@ -577,9 +572,9 @@ void Field_decimal::store(const char *from,uint len)
 	int_digits_added_zeros=0;
       }
     }
-    tmp_uint=tmp_dec+(int_digits_end-int_digits_from)
-                 +(uint)(frac_digits_from-int_digits_tail_from)+
-                 int_digits_added_zeros;
+    tmp_uint= (tmp_dec+(int_digits_end-int_digits_from)+
+               (uint)(frac_digits_from-int_digits_tail_from)+
+               int_digits_added_zeros);
   }
   
   /*
@@ -590,8 +585,7 @@ void Field_decimal::store(const char *from,uint len)
     If the sign is defined and '-', we need one position for it
   */
 
-  if (field_length < tmp_uint + (sign_char == '-')) 
-  //the rightmost sum above cannot overflow
+  if (field_length < tmp_uint + (int) (sign_char == '-')) 
   {
     // too big number, change to max or min number
     Field_decimal::overflow(sign_char == '-');
@@ -654,8 +648,6 @@ void Field_decimal::store(const char *from,uint len)
       *pos--=' ';  //fill with blanks
   }
   
-  //  if (tmp_dec)
-  { 
   /*
     Write digits of the frac_% parts ;
     Depending on current_thd->count_cutted_fields, we may also want
@@ -667,7 +659,8 @@ void Field_decimal::store(const char *from,uint len)
       
   pos=to+(uint)(field_length-tmp_dec);	// Calculate post to '.'
   right_wall=to+field_length;
-    if (pos != right_wall) *pos++='.';
+  if (pos != right_wall) 
+    *pos++='.';
 
   if (expo_sign_char == '-')
   {
@@ -716,7 +709,7 @@ void Field_decimal::store(const char *from,uint len)
       
   while (pos != right_wall)
    *pos++='0';			// Fill with zeros at right of '.'
-  }
+  
 }