git.ozlabs.org Git - petitboot/blob - discover/grub2/grub2.h

   1 #ifndef GRUB2_H
   2 #define GRUB2_H
   3
   4 #include <discover/device-handler.h>
   5
   6 #include <stdbool.h>
   7 #include <list/list.h>
   8
   9 struct grub2_script;
  10
  11 struct grub2_word {
  12         enum {
  13                 GRUB2_WORD_TEXT,
  14                 GRUB2_WORD_VAR,
  15         } type;
  16         union {
  17                 char            *text;
  18                 const char      *name;
  19         };
  20         bool                    split;
  21         struct grub2_word       *next;
  22         struct grub2_word       *last;
  23         struct list_item        argv_list;
  24 };
  25
  26 struct grub2_argv {
  27         struct list             words;
  28
  29         /* postprocessing (with process_expansions) populates these to hand to
  30          * the grub2_command callbacks */
  31         char                    **argv;
  32         int                     argc;
  33 };
  34
  35 struct grub2_statements {
  36         struct list             list;
  37 };
  38
  39 struct grub2_statement {
  40         struct list_item        list;
  41         enum {
  42                 STMT_TYPE_SIMPLE,
  43                 STMT_TYPE_MENUENTRY,
  44                 STMT_TYPE_IF,
  45                 STMT_TYPE_BLOCK,
  46                 STMT_TYPE_CONDITIONAL,
  47         } type;
  48         int                     (*exec)(struct grub2_script *,
  49                                         struct grub2_statement *);
  50 };
  51
  52 struct grub2_statement_simple {
  53         struct grub2_statement  st;
  54         struct grub2_argv       *argv;
  55 };
  56
  57 struct grub2_statement_menuentry {
  58         struct grub2_statement  st;
  59         struct grub2_argv       *argv;
  60         struct grub2_statements *statements;
  61 };
  62
  63 struct grub2_statement_conditional {
  64         struct grub2_statement  st;
  65         struct grub2_statement  *condition;
  66         struct grub2_statements *statements;
  67 };
  68
  69 struct grub2_statement_if {
  70         struct grub2_statement  st;
  71         struct grub2_statements *conditionals;
  72         struct grub2_statements *else_case;
  73 };
  74
  75 struct grub2_statement_block {
  76         struct grub2_statement  st;
  77         struct grub2_statements *statements;
  78 };
  79
  80 struct grub2_statement_function {
  81         struct grub2_statement  st;
  82         struct grub2_word       *name;
  83         struct grub2_statements *body;
  84 };
  85
  86 struct grub2_script {
  87         struct grub2_statements         *statements;
  88         struct list                     environment;
  89         struct list                     symtab;
  90         struct discover_context         *ctx;
  91         struct discover_boot_option     *opt;
  92 };
  93
  94 struct grub2_parser {
  95         void                    *scanner;
  96         struct grub2_script     *script;
  97 };
  98
  99 /* type for builtin functions */
 100 typedef int (*grub2_function)(struct grub2_script *script, void *data,
 101                                 int argc, char *argv[]);
 102
 103 struct grub2_statements *create_statements(struct grub2_parser *parser);
 104
 105 struct grub2_statement *create_statement_simple(struct grub2_parser *parser,
 106                 struct grub2_argv *argv);
 107
 108 struct grub2_statement *create_statement_menuentry(struct grub2_parser *parser,
 109                 struct grub2_argv *argv, struct grub2_statements *stmts);
 110
 111 struct grub2_statement *create_statement_conditional(
 112                 struct grub2_parser *parser, struct grub2_statement *condition,
 113                 struct grub2_statements *statements);
 114
 115 struct grub2_statement *create_statement_if(struct grub2_parser *parser,
 116                 struct grub2_statement *conditional,
 117                 struct grub2_statements *elifs,
 118                 struct grub2_statements *else_case);
 119
 120 struct grub2_statement *create_statement_block(struct grub2_parser *parser,
 121                 struct grub2_statements *stmts);
 122
 123 struct grub2_statement *create_statement_function(struct grub2_parser *parser,
 124                 struct grub2_word *name, struct grub2_statements *body);
 125
 126 struct grub2_word *create_word_text(struct grub2_parser *parser,
 127                 const char *text);
 128
 129 struct grub2_word *create_word_var(struct grub2_parser *parser,
 130                 const char *name, bool split);
 131
 132 struct grub2_argv *create_argv(struct grub2_parser *parser);
 133
 134 void statement_append(struct grub2_statements *stmts,
 135                 struct grub2_statement *stmt);
 136
 137 void argv_append(struct grub2_argv *argv, struct grub2_word *word);
 138
 139 void word_append(struct grub2_word *w1, struct grub2_word *w2);
 140
 141 /* script interface */
 142 void script_execute(struct grub2_script *script);
 143
 144 int statement_simple_execute(struct grub2_script *script,
 145                 struct grub2_statement *statement);
 146 int statement_block_execute(struct grub2_script *script,
 147                 struct grub2_statement *statement);
 148 int statement_if_execute(struct grub2_script *script,
 149                 struct grub2_statement *statement);
 150 int statement_menuentry_execute(struct grub2_script *script,
 151                 struct grub2_statement *statement);
 152 int statement_function_execute(struct grub2_script *script,
 153                 struct grub2_statement *statement);
 154
 155 struct grub2_script *create_script(struct grub2_parser *parser,
 156                 struct discover_context *ctx);
 157
 158 const char *script_env_get(struct grub2_script *script, const char *name);
 159
 160 void script_env_set(struct grub2_script *script,
 161                 const char *name, const char *value);
 162
 163 void script_register_function(struct grub2_script *script,
 164                 const char *name, grub2_function fn, void *data);
 165
 166 void register_builtins(struct grub2_script *script);
 167
 168 /* resources */
 169 struct resource *create_grub2_resource(void *ctx,
 170                 struct discover_device *orig_device,
 171                 const char *root, const char *path);
 172
 173 bool resolve_grub2_resource(struct device_handler *handler,
 174                 struct resource *res);
 175
 176 /* external parser api */
 177 struct grub2_parser *grub2_parser_create(struct discover_context *ctx);
 178 void grub2_parser_parse(struct grub2_parser *parser, char *buf, int len);
 179 #endif /* GRUB2_H */
 180