discover/grub2: Clean up error-handling for grub2 parser & lexer

[petitboot] / discover / grub2 / script.c

diff --git a/discover/grub2/script.c b/discover/grub2/script.c
index ec37fbb0c06bc1b8da5984e339c90a27502689a3..d0b824aebcb9965e63d2ec0d0cb631da0a2dfc5d 100644 (file)
--- a/discover/grub2/script.c
+++ b/discover/grub2/script.c
@@ -1,7 +1,9 @@
 
 #include <sys/types.h>
 #include <string.h>
+#include <stdlib.h>
 
+#include <log/log.h>
 #include <types/types.h>
 #include <talloc/talloc.h>
 
@@ -9,10 +11,16 @@
 
 #define to_stmt_simple(stmt) \
        container_of(stmt, struct grub2_statement_simple, st)
+#define to_stmt_block(stmt) \
+       container_of(stmt, struct grub2_statement_block, st)
 #define to_stmt_if(stmt) \
        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;
@@ -90,6 +98,24 @@ static bool is_delim(char c)
        return c == ' ' || c == '\t';
 }
 
+static bool option_is_default(struct grub2_script *script,
+               struct discover_boot_option *opt)
+{
+       unsigned int default_idx;
+       const char *var;
+       char *end;
+
+       var = script_env_get(script, "default");
+       if (!var)
+               return false;
+
+       default_idx = strtoul(var, &end, 10);
+       if (end != var && *end == '\0')
+               return default_idx == script->n_options;
+
+       return !strcmp(opt->option->name, var);
+}
+
 /* For non-double-quoted variable expansions, we may need to split the
  * variable's value into multiple argv items.
  *
@@ -229,6 +255,7 @@ int statement_simple_execute(struct grub2_script *script,
 {
        struct grub2_statement_simple *st = to_stmt_simple(statement);
        struct grub2_symtab_entry *entry;
+       char *pos;
        int rc;
 
        if (!st->argv)
@@ -239,10 +266,21 @@ int statement_simple_execute(struct grub2_script *script,
        if (!st->argv->argc)
                return 0;
 
+       /* is this a var=value assignment? */
+       pos = strchr(st->argv->argv[0], '=');
+       if (pos) {
+               char *name, *value;
+               name = st->argv->argv[0];
+               name = talloc_strndup(st, name, pos - name);
+               value = pos + 1;
+               script_env_set(script, name, value);
+               return 0;
+       }
+
        entry = script_lookup_function(script, st->argv->argv[0]);
        if (!entry) {
-               fprintf(stderr, "undefined function '%s'\n", st->argv->argv[0]);
-               return 0;
+               pb_log("grub2: undefined function '%s'\n", st->argv->argv[0]);
+               return 1;
        }
 
        rc = entry->fn(script, entry->data, st->argv->argc, st->argv->argv);
@@ -250,24 +288,45 @@ int statement_simple_execute(struct grub2_script *script,
        return rc;
 }
 
-int statement_if_execute(struct grub2_script *script,
+int statement_block_execute(struct grub2_script *script,
                struct grub2_statement *statement)
 {
-       struct grub2_statement_if *st = to_stmt_if(statement);
-       struct grub2_statements *case_stmts;
+       struct grub2_statement_block *st = to_stmt_block(statement);
+       return statements_execute(script, st->statements);
+}
+
+/* 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);
 
-       if (rc == 0)
-               case_stmts = st->true_case;
-       else
-               case_stmts = st->false_case;
+       return rc;
+}
 
-       if (case_stmts)
-               statements_execute(script, case_stmts);
-       else
-               rc = 0;
+int statement_if_execute(struct grub2_script *script,
+               struct grub2_statement *statement)
+{
+       struct grub2_statement_if *st = to_stmt_if(statement);
+       struct grub2_statement *conditional;
+       bool executed;
+       int rc;
+
+       list_for_each_entry(&st->conditionals->list, conditional, list) {
+               rc = statement_conditional_execute(script,
+                               conditional, &executed);
+               if (executed)
+                       break;
+       }
+
+       if (!executed && st->else_case)
+               rc = statements_execute(script, st->else_case);
 
        return rc;
 }
@@ -286,17 +345,54 @@ int statement_menuentry_execute(struct grub2_script *script,
        } else {
                opt->option->name = talloc_strdup(opt, "(unknown)");
        }
+       opt->option->id = talloc_asprintf(opt->option, "%s#%s",
+                       script->ctx->device->device->id,
+                       opt->option->name);
 
        script->opt = opt;
 
        statements_execute(script, st->statements);
 
+       opt->option->is_default = option_is_default(script, opt);
+
        discover_context_add_boot_option(script->ctx, opt);
+       script->n_options++;
        script->opt = NULL;
 
        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;
@@ -334,11 +430,10 @@ struct grub2_script *create_script(struct grub2_parser *parser,
 {
        struct grub2_script *script;
 
-       script = talloc(parser, struct grub2_script);
+       script = talloc_zero(parser, struct grub2_script);
 
        init_env(script);
        script->ctx = ctx;
-       script->opt = NULL;
 
        list_init(&script->symtab);
        register_builtins(script);