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Add pre and post increment

--- a/expr.c

+++ b/expr.c

@@ -163,6 +163,25 @@

 	}

 }

+static Node *

+unary(void)

+{

+	Node *np;

+	char op;

+

+	switch (yytoken) {

+	case INC: case DEC:

+		op = (yytoken == INC) ? OINC : ODEC;

+		/* TODO: check that the the base type is a complete type */

+		next();

+		np = unary();

+		return unarycode(op, np->type, np);

+		break;

+	default:

+		return postfix();

+	}

+}

+

 Node *

 expr(void)

 {

@@ -169,7 +188,7 @@

 	Node *np;

 	do

-		np = postfix();

+		np = unary();

 	while (yytoken == ',');

 	return np;

 }