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Add lenght definition in arrays

At this moment we only parse the lenght expression, and we only
admit constant array lenght.

--- a/decl.c

+++ b/decl.c

@@ -52,11 +52,17 @@

 				/* TODO: prototyped function */;

 			continue;

 		} else if (accept('[')) {

+			unsigned len;

+

+			if (accept(']')) {

+				len = 0;

+			} else {

+				expect(CONSTANT);

+				len = yyval.sym->val;

+				expect(']');

+			}

+			pushtype(len);

 			pushtype(ARY);

-			if (accept(']'))

-				; /* TODO: automatic size array */

-			else

-				/* TODO: specify size of array */;

 			continue;

 		} else {

 			return;

--- a/symbol.h

+++ b/symbol.h

@@ -31,6 +31,7 @@

 	bool c_volatile : 1;

 	bool c_restrict : 1;

 	bool c_unsigned : 1;

+	unsigned len;

 	struct ctype *base;

 	unsigned char refcnt;

 };

@@ -55,7 +56,7 @@

 extern struct ctype *decl_type(struct ctype *t);

-extern void pushtype(unsigned char mod);

+extern void pushtype(unsigned mod);

 extern unsigned char btype(unsigned char, unsigned char tok);

 extern void new_ctx(void);

 extern void del_ctx(void);

--- a/types.c

+++ b/types.c

@@ -34,8 +34,13 @@

 static struct ctype *

 mktype(register struct ctype *tp, unsigned  char op)

 {

+	unsigned len;

+

 	switch (op) {

-	case PTR: case ARY: case FTN: {

+	case ARY:

+		assert(stackp != stack);

+		len = *--stackp;

+	case PTR: case FTN: {

 		register struct ctype *aux = tp;

 		++tp->refcnt;

@@ -42,6 +47,7 @@

 		tp = newctype();

 		tp->type = op;

 		tp->base = aux;

+		tp->len = len;

 		break;

 	}

 	case VOLATILE:

@@ -62,7 +68,7 @@

 }

 void

-pushtype(unsigned char mod)

+pushtype(unsigned mod)

 {

 	if (stackp == stack + NR_DECLARATORS)

 		error("Too much type declarators");

-- 

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