discover/grub2: expose internal parse function

Upcoming changes will need a method to parse a secondary file (to
support the 'source' command), but not execute it as a new script.

This change exposes the parsing code, separate from the execution code.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

discover/grub2/grub2-parser.y

@@ -331,14 +331,15 @@ struct grub2_parser *grub2_parser_create(struct discover_context *ctx)
 	return parser;
 }
 
-void grub2_parser_parse(struct grub2_parser *parser, const char *filename,
+/* performs a parse on buf, setting parser->script->statements */
+int grub2_parser_parse(struct grub2_parser *parser, const char *filename,
 		char *buf, int len)
 {
 	YY_BUFFER_STATE bufstate;
 	int rc;
 
 	if (!len)
-		return;
+		return -1;
 
 	parser->script->filename = filename;
 
@@ -349,6 +350,18 @@ void grub2_parser_parse(struct grub2_parser *parser, const char *filename,
 
 	yy_delete_buffer(bufstate, parser->scanner);
 
+	parser->inter_word = false;
+
+	return rc;
+}
+
+void grub2_parser_parse_and_execute(struct grub2_parser *parser,
+		const char *filename, char *buf, int len)
+{
+	int rc;
+
+	rc = grub2_parser_parse(parser, filename, buf, len);
+
 	if (!rc)
 		script_execute(parser->script);
 }

discover/grub2/grub2.c

@@ -169,7 +169,7 @@ static int grub2_parse(struct discover_context *dc)
 			continue;
 
 		parser = grub2_parser_create(dc);
-		grub2_parser_parse(parser, *filename, buf, len);
+		grub2_parser_parse_and_execute(parser, *filename, buf, len);
 		device_handler_status_dev_info(dc->handler, dc->device,
 				_("Parsed GRUB configuration from %s"),
 				*filename);

discover/grub2/grub2.h

@@ -204,9 +204,13 @@ struct grub2_file *grub2_parse_file(struct grub2_script *script,
 struct discover_device *grub2_lookup_device(struct device_handler *handler,
 		const char *desc);
 
+/* internal parse api */
+int grub2_parser_parse(struct grub2_parser *parser, const char *filename,
+		char *buf, int len);
+
 /* external parser api */
 struct grub2_parser *grub2_parser_create(struct discover_context *ctx);
-void grub2_parser_parse(struct grub2_parser *parser, const char *filename,
-		char *buf, int len);
+void grub2_parser_parse_and_execute(struct grub2_parser *parser,
+		const char *filename, char *buf, int len);
 #endif /* GRUB2_H */