discover/grub2: Add function support

[petitboot] / discover / grub2 / script.c

diff --git a/discover/grub2/script.c b/discover/grub2/script.c
index ec37fbb0c06bc1b8da5984e339c90a27502689a3..9c087373ac0454524308fa6da5370a0b86b69cc5 100644 (file)
--- a/discover/grub2/script.c
+++ b/discover/grub2/script.c
@@ -13,6 +13,8 @@
        container_of(stmt, struct grub2_statement_if, st)
 #define to_stmt_menuentry(stmt) \
        container_of(stmt, struct grub2_statement_menuentry, st)
+#define to_stmt_function(stmt) \
+       container_of(stmt, struct grub2_statement_function, st)
 
 struct env_entry {
        const char              *name;
@@ -297,6 +299,37 @@ int statement_menuentry_execute(struct grub2_script *script,
        return 0;
 }
 
+static int function_invoke(struct grub2_script *script,
+               void *data, int argc, char **argv)
+{
+       struct grub2_statement_function *fn = data;
+       char *name;
+       int i;
+
+       /* set positional parameters */
+       for (i = 0; i < argc; i++) {
+               name = talloc_asprintf(script, "$%d", i);
+               script_env_set(script, name, argv[i]);
+       }
+
+       return statements_execute(script, fn->body);
+}
+
+int statement_function_execute(struct grub2_script *script,
+               struct grub2_statement *statement)
+{
+       struct grub2_statement_function *st = to_stmt_function(statement);
+       const char *name;
+
+       if (st->name->type == GRUB2_WORD_VAR)
+               expand_var(script, st->name);
+
+       name = st->name->text;
+       script_register_function(script, name, function_invoke, st);
+
+       return 0;
+}
+
 static void init_env(struct grub2_script *script)
 {
        struct env_entry *env;