libdpkg: Add new enum parsedbtype

This will allow to track more easily what's going on in the code, when
having to distinguish between behaviour depending on the file being
parsed.

lib/dpkg/parse.c

@@ -332,6 +332,25 @@ pkg_parse_copy(struct parsedb_state *ps,
   }
 }
 
+/**
+ * Return a descriptive parser type.
+ */
+static enum parsedbtype
+parse_get_type(struct parsedb_state *ps, enum parsedbflags flags)
+{
+  if (flags & pdb_recordavailable) {
+    if (flags & pdb_deb_control)
+      return pdb_file_control;
+    else
+      return pdb_file_available;
+  } else {
+    if (flags & pdb_deb_control)
+      return pdb_file_update;
+    else
+      return pdb_file_status;
+  }
+}
+
 /**
  * Open a file for RFC-822 parsing.
  */
@@ -343,6 +362,7 @@ parse_open(struct parsedb_state *ps, const char *filename,
   struct stat st;
 
   ps->filename = filename;
+  ps->type = parse_get_type(ps, flags);
   ps->flags = flags;
   ps->lno = 0;
   ps->pkg = NULL;

lib/dpkg/parsedump.h

@@ -25,7 +25,18 @@
 
 struct fieldinfo;
 
+/**
+ * Parse action.
+ */
+enum parsedbtype {
+	pdb_file_update,
+	pdb_file_status,
+	pdb_file_control,
+	pdb_file_available,
+};
+
 struct parsedb_state {
+	enum parsedbtype type;
 	enum parsedbflags flags;
 	struct pkginfo *pkg;
 	struct pkgbin *pkgbin;