shithub: rgbds

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Fix division by zero crashes in instructions

Previously, rgbasm could crash with a floating point exception if an
instruction includes a division or modulo by 0. Fixes #49.

--- a/src/asm/rpn.c

+++ b/src/asm/rpn.c

@@ -316,6 +316,9 @@

     struct Expression * src2)

 {

 	joinexpr();

+	if (src2->nVal == 0) {

+		fatalerror("division by zero");

+	}

 	expr->nVal = (expr->nVal / src2->nVal);

 	pushbyte(expr, RPN_DIV);

 }

@@ -325,6 +328,9 @@

     struct Expression * src2)

 {

 	joinexpr();

+	if (src2->nVal == 0) {

+		fatalerror("division by zero");

+	}

 	expr->nVal = (expr->nVal % src2->nVal);

 	pushbyte(expr, RPN_MOD);

 }