#include <sys/types.h>
#include <string.h>
+#include <stdlib.h>
+#include <types/types.h>
#include <talloc/talloc.h>
#include "grub2.h"
#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;
struct list_item list;
};
-static const char *env_lookup(struct grub2_script *script,
- const char *name)
+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;
return NULL;
}
+void script_env_set(struct grub2_script *script,
+ const char *name, const char *value)
+{
+ struct env_entry *e, *entry = NULL;
+
+ list_for_each_entry(&script->environment, e, list) {
+ if (!strcmp(e->name, name)) {
+ entry = e;
+ break;
+ }
+ }
+
+ if (!entry) {
+ entry = talloc(script, struct env_entry);
+ entry->name = name;
+ list_add(&script->environment, &entry->list);
+ }
+
+ entry->value = value;
+}
+
static bool expand_var(struct grub2_script *script, struct grub2_word *word)
{
const char *val;
- val = env_lookup(script, word->var.name);
+ val = script_env_get(script, word->name);
if (!val)
val = "";
- word->type = GRUB2_WORD_TEXT;
word->text = talloc_strdup(script, val);
return true;
}
-/* iterate through the words in an argv, looking for GRUB2_WORD_VAR expansions.
+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.
+ *
+ * This function sets the word->text to the initial set of non-delimiter chars
+ * in the expanded var value. We then skip any delimiter chars, and (if
+ * required), create the new argv item with the remaining text, and
+ * add it to the argv list, after top_word.
+ */
+static void process_split(struct grub2_script *script,
+ struct grub2_word *top_word,
+ struct grub2_word *word)
+{
+ int i, len, delim_start = -1, delim_end = -1;
+ struct grub2_word *new_word;
+ char *remainder;
+
+ len = strlen(word->text);
+
+ /* Scan our string for the start of a delim (delim_start), and the
+ * start of any new text (delim_end). */
+ for (i = 0; i < len; i++) {
+ if (is_delim(word->text[i])) {
+ if (delim_start == -1)
+ delim_start = i;
+ } else if (delim_start != -1) {
+ delim_end = i;
+ break;
+ }
+ }
+
+ /* No delim? nothing to do. The process_expansions loop will
+ * append this word's text to the top word, if necessary
+ */
+ if (delim_start == -1)
+ return;
+
+ /* Set this word's text value to the text before the delimiter.
+ * this will get appended to the top word
+ */
+ word->text[delim_start] = '\0';
+
+ /* No trailing text? If there are no following word tokens, we're done.
+ * Otherwise, we need to start a new argv item with those tokens */
+ if (delim_end == -1) {
+ if (!word->next)
+ return;
+ remainder = "";
+ } else {
+ remainder = word->text + delim_end;
+ }
+
+ new_word = talloc(script, struct grub2_word);
+ new_word->type = GRUB2_WORD_TEXT;
+ /* if there's no trailing text, we know we don't need to re-split */
+ new_word->split = delim_end != -1;
+ new_word->next = word->next;
+ new_word->last = NULL;
+ new_word->text = talloc_strdup(new_word, remainder);
+
+ /* stitch it into the argv list before this word */
+ list_insert_after(&top_word->argv_list,
+ &new_word->argv_list);
+
+ /* terminate this word */
+ word->next = NULL;
+}
+
+/* iterate through the words in an argv_list, looking for GRUB2_WORD_VAR
+ * expansions.
*
* Once that's done, we may (if split == true) have to split the word to create
* new argv items
struct grub2_argv *argv)
{
struct grub2_word *top_word, *word;
+ int i;
+
+ argv->argc = 0;
list_for_each_entry(&argv->words, top_word, argv_list) {
- /* expand vars and squash the list of words into the top struct.
- * todo: splitting
- */
+ argv->argc++;
+
+ /* expand vars and squash the list of words into the head
+ * of the argv word list */
for (word = top_word; word; word = word->next) {
- if (word->type == GRUB2_WORD_VAR)
+
+ /* if it's a variable, perform the substitution */
+ if (word->type == GRUB2_WORD_VAR) {
expand_var(script, word);
+ word->type = GRUB2_WORD_TEXT;
+ }
+
+ /* split; this will potentially insert argv
+ * entries after top_word. */
+ if (word->split)
+ process_split(script, top_word, word);
+
+ /* accumulate word text into the top word, so
+ * we end up with a shallow tree of argv data */
+ /* todo: don't do this in process_split */
+ if (word != top_word) {
+ top_word->text = talloc_asprintf_append(
+ top_word->text,
+ "%s", word->text);
+ }
- if (word == top_word)
- continue;
- top_word->text = talloc_asprintf_append(top_word->text,
- "%s", word->text);
}
top_word->next = NULL;
}
+
+ /* convert the list to an argv array, to pass to the function */
+ argv->argv = talloc_array(script, char *, argv->argc);
+ i = 0;
+
+ list_for_each_entry(&argv->words, word, argv_list)
+ argv->argv[i++] = word->text;
}
-int statements_execute(struct grub2_script *script,
+static int statements_execute(struct grub2_script *script,
struct grub2_statements *stmts)
{
struct grub2_statement *stmt;
struct grub2_statement *statement)
{
struct grub2_statement_simple *st = to_stmt_simple(statement);
+ struct grub2_symtab_entry *entry;
+ char *pos;
+ int rc;
if (!st->argv)
return 0;
process_expansions(script, st->argv);
- return 0;
+ 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 1;
+ }
+
+ rc = entry->fn(script, entry->data, st->argv->argc, st->argv->argv);
+
+ 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;
}
+int statement_menuentry_execute(struct grub2_script *script,
+ struct grub2_statement *statement)
+{
+ struct grub2_statement_menuentry *st = to_stmt_menuentry(statement);
+ struct discover_boot_option *opt;
+
+ process_expansions(script, st->argv);
+
+ opt = discover_boot_option_create(script->ctx, script->ctx->device);
+ if (st->argv->argc > 0) {
+ opt->option->name = talloc_strdup(opt, st->argv->argv[0]);
+ } 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;
list_add(&script->environment, &env->list);
}
+void script_register_function(struct grub2_script *script,
+ const char *name, grub2_function fn,
+ void *data)
+{
+ struct grub2_symtab_entry *entry;
+
+ entry = talloc(script, struct grub2_symtab_entry);
+ entry->fn = fn;
+ entry->name = name;
+ entry->data = data;
+ list_add(&script->symtab, &entry->list);
+}
+
void script_execute(struct grub2_script *script)
{
statements_execute(script, script->statements);
}
-struct grub2_script *create_script(void *ctx)
+struct grub2_script *create_script(struct grub2_parser *parser,
+ struct discover_context *ctx)
{
struct grub2_script *script;
- script = talloc(ctx, struct grub2_script);
+ script = talloc_zero(parser, struct grub2_script);
init_env(script);
+ script->ctx = ctx;
+
+ list_init(&script->symtab);
+ register_builtins(script);
return script;
}
projects / petitboot / blobdiff