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)
+#define to_stmt_conditional(stmt) \
+ container_of(stmt, struct grub2_statement_conditional, st)
struct env_entry {
const char *name;
struct list_item list;
};
+struct grub2_symtab_entry {
+ const char *name;
+ grub2_function fn;
+ void *data;
+ struct list_item list;
+};
+
+static struct grub2_symtab_entry *script_lookup_function(
+ struct grub2_script *script, const char *name)
+{
+ struct grub2_symtab_entry *entry;
+
+ list_for_each_entry(&script->symtab, entry, list) {
+ if (!strcmp(entry->name, name))
+ return entry;
+ }
+
+ return NULL;
+}
+
const char *script_env_get(struct grub2_script *script, const char *name)
{
struct env_entry *entry;
struct grub2_statement *statement)
{
struct grub2_statement_simple *st = to_stmt_simple(statement);
- struct grub2_command *cmd;
+ struct grub2_symtab_entry *entry;
int rc;
if (!st->argv)
if (!st->argv->argc)
return 0;
- cmd = script_lookup_command(script, st->argv->argv[0]);
- if (!cmd) {
- fprintf(stderr, "undefined command '%s'\n", st->argv->argv[0]);
+ entry = script_lookup_function(script, st->argv->argv[0]);
+ if (!entry) {
+ fprintf(stderr, "undefined function '%s'\n", st->argv->argv[0]);
return 0;
}
- rc = cmd->exec(script, st->argv->argc, st->argv->argv);
+ rc = entry->fn(script, entry->data, st->argv->argc, st->argv->argv);
+
+ return rc;
+}
+
+/* returns 0 if the statement was executed, 1 otherwise */
+static int statement_conditional_execute(struct grub2_script *script,
+ struct grub2_statement *statement, bool *executed)
+{
+ struct grub2_statement_conditional *st = to_stmt_conditional(statement);
+ int rc;
+
+ rc = st->condition->exec(script, st->condition);
+ *executed = (!rc);
+ if (*executed)
+ rc = statements_execute(script, st->statements);
return rc;
}
struct grub2_statement *statement)
{
struct grub2_statement_if *st = to_stmt_if(statement);
- struct grub2_statements *case_stmts;
+ struct grub2_statement *conditional;
+ bool executed;
int rc;
- rc = st->condition->exec(script, st->condition);
-
- if (rc == 0)
- case_stmts = st->true_case;
- else
- case_stmts = st->false_case;
+ list_for_each_entry(&st->conditionals->list, conditional, list) {
+ rc = statement_conditional_execute(script,
+ conditional, &executed);
+ if (executed)
+ break;
+ }
- if (case_stmts)
- statements_execute(script, case_stmts);
- else
- rc = 0;
+ if (!executed && st->else_case)
+ rc = statements_execute(script, st->else_case);
return rc;
}
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;
list_add(&script->environment, &env->list);
}
-struct grub2_command *script_lookup_command(struct grub2_script *script,
- const char *name)
+void script_register_function(struct grub2_script *script,
+ const char *name, grub2_function fn,
+ void *data)
{
- struct grub2_command *command;
+ struct grub2_symtab_entry *entry;
- list_for_each_entry(&script->commands, command, list) {
- if (!strcmp(command->name, name))
- return command;
- }
-
- return NULL;
-}
-
-void script_register_command(struct grub2_script *script,
- struct grub2_command *command)
-{
- list_add(&script->commands, &command->list);
+ entry = talloc(script, struct grub2_symtab_entry);
+ entry->fn = fn;
+ entry->name = name;
+ entry->data = data;
+ list_add(&script->symtab, &entry->list);
}
script->ctx = ctx;
script->opt = NULL;
- list_init(&script->commands);
+ list_init(&script->symtab);
register_builtins(script);
return script;