discover/grub2: Fix word append

[petitboot] / discover / grub2 / script.c

diff --git a/discover/grub2/script.c b/discover/grub2/script.c
index 71d6cba81a77cfabf37d2fc6bacfcf0d42092973..536139418d93b89457743bc35688bb03103e0fb6 100644 (file)
--- a/discover/grub2/script.c
+++ b/discover/grub2/script.c
@@ -1,12 +1,151 @@
 
+#include <sys/types.h>
+#include <string.h>
+
 #include <talloc/talloc.h>
 
 #include "grub2.h"
 
+#define to_stmt_simple(stmt) \
+       container_of(stmt, struct grub2_statement_simple, st)
+#define to_stmt_if(stmt) \
+       container_of(stmt, struct grub2_statement_if, st)
+
+struct env_entry {
+       const char              *name;
+       const char              *value;
+       struct list_item        list;
+};
+
+static const char *env_lookup(struct grub2_script *script,
+               const char *name)
+{
+       struct env_entry *entry;
+
+       list_for_each_entry(&script->environment, entry, list)
+               if (!strcmp(entry->name, name))
+                       return entry->value;
+
+       return NULL;
+}
+
+static bool expand_var(struct grub2_script *script, struct grub2_word *word)
+{
+       const char *val;
+
+       val = env_lookup(script, word->var.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.
+ *
+ * Once that's done, we may (if split == true) have to split the word to create
+ * new argv items
+ */
+static void process_expansions(struct grub2_script *script,
+               struct grub2_argv *argv)
+{
+       struct grub2_word *top_word, *word;
+
+       list_for_each_entry(&argv->words, top_word, argv_list) {
+               /* expand vars and squash the list of words into the top struct.
+                * todo: splitting
+                */
+               for (word = top_word; word; word = word->next) {
+                       if (word->type == GRUB2_WORD_VAR)
+                               expand_var(script, word);
+
+                       if (word == top_word)
+                               continue;
+
+                       top_word->text = talloc_asprintf_append(top_word->text,
+                                       "%s", word->text);
+               }
+               top_word->next = NULL;
+       }
+}
+
+int statements_execute(struct grub2_script *script,
+               struct grub2_statements *stmts)
+{
+       struct grub2_statement *stmt;
+       int rc = 0;
+
+       list_for_each_entry(&stmts->list, stmt, list) {
+               if (stmt->exec)
+                       rc = stmt->exec(script, stmt);
+       }
+       return rc;
+}
+
+int statement_simple_execute(struct grub2_script *script,
+               struct grub2_statement *statement)
+{
+       struct grub2_statement_simple *st = to_stmt_simple(statement);
+
+       if (!st->argv)
+               return 0;
+
+       process_expansions(script, st->argv);
+
+       return 0;
+}
+
+int statement_if_execute(struct grub2_script *script,
+               struct grub2_statement *statement)
+{
+       struct grub2_statement_if *st = to_stmt_if(statement);
+       struct grub2_statements *case_stmts;
+       int rc;
+
+       rc = st->condition->exec(script, st->condition);
+
+       if (rc == 0)
+               case_stmts = st->true_case;
+       else
+               case_stmts = st->false_case;
+
+       if (case_stmts)
+               statements_execute(script, case_stmts);
+       else
+               rc = 0;
+
+       return rc;
+}
+
+static void init_env(struct grub2_script *script)
+{
+       struct env_entry *env;
+
+       list_init(&script->environment);
+
+       env = talloc(script, struct env_entry);
+       env->name = talloc_strdup(env, "prefix");
+       env->value = talloc_strdup(env, "/");
+
+       list_add(&script->environment, &env->list);
+}
+
+
+void script_execute(struct grub2_script *script)
+{
+       statements_execute(script, script->statements);
+}
+
 struct grub2_script *create_script(void *ctx)
 {
        struct grub2_script *script;
+
        script = talloc(ctx, struct grub2_script);
+
+       init_env(script);
+
        return script;
 }