zdump/opts: Make parsing of command line arguments testable

Make the C module responsible for the parsing of command-line arguments
independent of other global variables. This improves its testability.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zdump/zgetdump.h

@@ -12,43 +12,16 @@
 #ifndef ZGETDUMP_H
 #define ZGETDUMP_H
 
-#include "zg.h"
-
-/*
- * zgetdump options
- */
-struct options {
-	int		action_specified;
-	enum zg_action	action;
-	char		*device;
-	char		*mount_point;
-	int		fmt_specified;
-	const char	*fmt;
-	int		debug_specified;
-	char		**argv_fuse;
-	int		argc_fuse;
-	const char	*select;
-	int		select_specified;
-	int		verbose;
-};
-
-extern const char *OPTS_SELECT_KDUMP;
-extern const char *OPTS_SELECT_PROD;
-extern const char *OPTS_SELECT_ALL;
+#include "opts.h"
 
 /*
  * zgetdump globals
  */
 extern struct zgetdump_globals {
 	struct zg_fh	*fh;
-	const char 	*prog_name;
 	struct options	opts;
 } g;
 
-/*
- * Misc fuctions
- */
-extern void opts_parse(int argc, char *argv[]);
-extern int stdout_write_dump(void);
+int stdout_write_dump(void);
 
 #endif /* ZGETDUMP_H */