Fix floating point exception by checking for overflow.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@12278 57a11ea4-9604-0410-9ed3-97b8803252fd

src/app-utils/gnc-ui-util.c

@@ -1189,6 +1189,12 @@ PrintAmountInternal(char *buf, gnc_numeric val, const GNCPrintAmountInfo *info)
     rounding.num = 5; /* Limit the denom to 10^13 ~= 2^44, leaving max at ~524288 */
     rounding.denom = pow(10, max_dp + 1);
     val = gnc_numeric_add(val, rounding, GNC_DENOM_AUTO, GNC_DENOM_LCD);
+    /* Yes, rounding up can cause overflow.  Check for it. */
+    if (gnc_numeric_check(val)) {
+        PWARN("Bad numeric from rounding.");
+        *buf = '\0';
+        return 0;
+    }
   }
 
   /* calculate the integer part and the remainder */

src/app-utils/gnc-ui-util.h

@@ -295,6 +295,9 @@ GNCPrintAmountInfo gnc_default_price_print_info (void);
 
 GNCPrintAmountInfo gnc_integral_print_info (void);
 
+/* WARNING: Garbage in, garbage out.  You must check the validity of
+   the supplied gnc_numeric.  If it's invalid, the returned string
+   could point to ANYTHING. */
 const char * xaccPrintAmount (gnc_numeric val, GNCPrintAmountInfo info);
 int xaccSPrintAmount (char *buf, gnc_numeric val, GNCPrintAmountInfo info);