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Fix floating point division by zero in preprocessor expressions.

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Closes #1183
This commit is contained in:
William S Fulton 2018-01-15 07:51:18 +00:00
commit ea5b55ecf4
4 changed files with 39 additions and 4 deletions
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18
Source/Preprocessor/expr.c
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@ -188,12 +188,22 @@ static int reduce_op() {
sp--;
break;
case SWIG_TOKEN_SLASH:
stack[sp - 2].value = stack[sp - 2].value / stack[sp].value;
sp -= 2;
if (stack[sp].value != 0) {
stack[sp - 2].value = stack[sp - 2].value / stack[sp].value;
sp -= 2;
} else {
errmsg = "Division by zero in expression";
return 0;
}
break;
case SWIG_TOKEN_PERCENT:
stack[sp - 2].value = stack[sp - 2].value % stack[sp].value;
sp -= 2;
if (stack[sp].value != 0) {
stack[sp - 2].value = stack[sp - 2].value % stack[sp].value;
sp -= 2;
} else {
errmsg = "Modulo by zero in expression";
return 0;
}
break;
case SWIG_TOKEN_LSHIFT:
stack[sp - 2].value = stack[sp - 2].value << stack[sp].value;