shithub: scc

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Add add and sub

These operators have the same precedence level, so
they are implemented in the same function.

--- a/expr.c

+++ b/expr.c

@@ -265,6 +265,24 @@

 	}

 }

+static struct node *

+add(void)

+{

+	register char op;

+	register Node *np;

+

+	np = mul();

+	for (;;) {

+		switch (yytoken) {

+		case '+': op = OADD; break;

+		case '-': op = OSUB; break;

+		default:  return np;

+		}

+		next();

+		np = arithmetic(op, np, mul());

+	}

+}

+

 Node *

 expr(void)

 {

@@ -271,7 +289,7 @@

 	register Node *np;

 	do

-		np = mul();

+		np = add();

 	while (yytoken == ',');

 	return np;

 }