Don't use Fattrib() for listing files and folders

file_exists() could return true in case of a folder on TOS4/FreeMiNT and
path_exists() would fail on finding a folder on TOS 1.x-3.x and EmuTOS.

Hopefully this fixes freemint/qed#8 for good.

Author: mikrosk

fexists.c

@@ -32,5 +32,8 @@ int file_exists(char *filename)
 {
 	if (filename[0] == '\0')
 		return FALSE;
-	return Fattrib(filename, 0, 0) >= 0;
+	/* include read-only, hidden, system and files with archive-bit
+	 * (exclude volume labels and directories)
+	 */
+	return Fsfirst(filename, FA_RDONLY|FA_HIDDEN|FA_SYSTEM|FA_CHANGED) == 0;
 }

fsexists.c

@@ -34,7 +34,6 @@
 int path_exists(char *pathname)
 {
 	int r = FALSE;
-	short attr;
 
 	if (pathname[0] != '\0')
 	{
@@ -44,7 +43,8 @@ int path_exists(char *pathname)
 		if (trailing_backslash)
 			pathname[len-1] = '\0';
 
-		if ((attr = Fattrib(pathname, 0, 0)) >= 0 && (attr & FA_DIR) != 0)
+		if (Fsfirst(pathname, FA_RDONLY|FA_HIDDEN|FA_SYSTEM|FA_DIR|FA_CHANGED) == 0
+			&& ((Fgetdta())->dta_attribute & FA_DIR) != 0)
 			r = TRUE;
 
 		if (trailing_backslash)