* make simdb_t opaque type

src/database.c

@@ -18,6 +18,12 @@
 #include "database.h"
 #include "bitmap.h"
 
+struct _simdb_t {
+  int fd;
+  int flags;
+  char path[PATH_MAX];
+};
+
 #define DB_READ(db, buf, len, off) \
   errno = 0; \
   memset((buf), 0x0, (len)); \

src/database.h

@@ -22,11 +22,7 @@
 #define SIMDB_ERR_NXRECORD    -5 /* no such record in database */
 #define SIMDB_ERR_READONLY    -6 /* database opened in read-only mode */
 
-typedef struct {
+typedef struct _simdb_t simdb_t; /* opaque database type */
-  int fd;
-  int flags;
-  char path[PATH_MAX];
-} simdb_t;
 
 /**
   Database header format - fixed length, 48 bytes