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Catch a pointer to the current function

We need know where we are in the code, and having a pointer to the current
function allow us can check for example the returning value in a easy way.

--- a/decl.c

+++ b/decl.c

@@ -9,8 +9,8 @@

 #include "symbol.h"

 char parser_out_home;

+struct ctype *curfun;

-

 static void declarator(void);

 static void

@@ -140,15 +140,13 @@

 listdcl(register struct ctype *tp)

 {

 	do {

-		register  struct ctype *new;

-

 		declarator();

-		new = decl_type(tp);

-		if (!new->type) {

+		curfun = decl_type(tp);

+		if (!curfun->type) {

 			warning_error(options.implicit,

 				      "type defaults to 'int' in declaration of '%s'",

 				      yytext);

-		} else if (new->type == FTN && yytoken == '{') {

+		} else if (curfun->type == FTN && yytoken == '{') {

 			struct node *np = compound();

 			prtree(np);

 			putchar('\n');

--- a/flow.c

+++ b/flow.c

@@ -178,12 +178,11 @@

 _return(void)

 {

 	register struct node *np;

-	extern struct ctype *curfun;

 	expect(RETURN);

-	/* TODO: Check the type of the function, can be void */

 	np = expr();

 	expect(';');

+

 	return node1(ORETURN, np);

 }

--- a/symbol.h

+++ b/symbol.h

@@ -48,6 +48,7 @@

 	struct symbol *hash;

 };

+extern struct ctype *curfun;

 extern struct type tchar, tshort, tint, tulong, tllong, tvoid, tkeyword;

 extern struct type tfloat, tdouble, tldouble, tlong;