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Add parser for function calls

It is only a parser that accepts any call to function, without
any kind of semantic action and without generating any code. It is
a good point to begin.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -437,7 +437,28 @@

 	return np;

 }

+static Node *assign(void);

+

 static Node *

+arguments(Node *np)

+{

+	Node *par;

+

+	/* TODO: Check type of np */

+	expect('(');

+	if (accept(')'))

+		return np;

+

+	do {

+		if ((par = eval(assign())) == NULL)

+			unexpected();

+	} while (accept(','));

+

+	expect(')');

+	return np;

+}

+

+static Node *

 postfix(void)

 {

 	register Node *np1, *np2;

@@ -452,7 +473,7 @@

 			expect(']');

 			break;

 		case DEC: case INC:

-			np1 = incdec(np1,  (yytoken == INC) ? OINC : ODEC);

+			np1 = incdec(np1, (yytoken == INC) ? OINC : ODEC);

 			next();

 			break;

 		case INDIR:

@@ -461,7 +482,9 @@

 			next();

 			np1 = field(np1);

 			break;

-		/* TODO: case '(' */

+		case '(':

+			np1 = arguments(np1);

+			break;

 		default:

 			return np1;

 		}

-- 

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