src/helper/command.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifndef COMMAND_H
  24 #define COMMAND_H
  25
  26 #include "types.h"
  27
  28 /* Integrate the JIM TCL interpretor into the command processing. */
  29 #if BUILD_ECOSBOARD
  30 #include <stdio.h>
  31 #include <stdarg.h>
  32 /* Jim is provied by eCos */
  33 #include <cyg/jimtcl/jim.h>
  34 #else
  35 #include "jim.h"
  36 #endif
  37
  38 /* To achieve C99 printf compatibility in MinGW, gnu_printf should be
  39  * used for __attribute__((format( ... ))), with GCC v4.4 or later
  40  */
  41 #if (defined(IS_MINGW) && (((__GNUC__ << 16) + __GNUC_MINOR__) >= 0x00040004))
  42 #define PRINTF_ATTRIBUTE_FORMAT gnu_printf
  43 #else
  44 #define PRINTF_ATTRIBUTE_FORMAT printf
  45 #endif
  46
  47 enum command_mode
  48 {
  49         COMMAND_EXEC,
  50         COMMAND_CONFIG,
  51         COMMAND_ANY,
  52 };
  53
  54 struct command_context;
  55
  56 /// The type signature for command context's output handler.
  57 typedef int (*command_output_handler_t)(struct command_context *context,
  58                                 const char* line);
  59
  60 struct command_context
  61 {
  62         enum command_mode mode;
  63         struct command *commands;
  64         int current_target;
  65         /* Execute a command.
  66          *
  67          * If the command fails, it *MUST* return a value != ERROR_OK
  68          * (many commands break this rule, patches welcome!)
  69          *
  70          * This is *especially* important for commands such as writing
  71          * to flash or verifying memory. The reason is that those commands
  72          * can be used by programs to determine if the operation succeded
  73          * or not. If the operation failed, then a program can try
  74          * an alternative approach.
  75          *
  76          * Returning ERROR_COMMAND_SYNTAX_ERROR will have the effect of
  77          * printing out the syntax of the command.
  78          */
  79         command_output_handler_t output_handler;
  80         void *output_handler_priv;
  81 };
  82
  83 /**
  84  * When run_command is called, a new instance will be created on the
  85  * stack, filled with the proper values, and passed by reference to the
  86  * required COMMAND_HANDLER routine.
  87  */
  88 struct command_invocation {
  89         struct command_context *ctx;
  90         const char *name;
  91         unsigned argc;
  92         const char **argv;
  93 };
  94
  95 /**
  96  * Command handlers may be defined with more parameters than the base
  97  * set provided by command.c.  This macro uses C99 magic to allow
  98  * defining all such derivative types using this macro.
  99  */
 100 #define __COMMAND_HANDLER(name, extra...) \
 101                 int name(struct command_invocation *cmd, ##extra)
 102
 103 /**
 104  * Use this to macro to call a command helper (or a nested handler).
 105  * It provides command handler authors protection against reordering or
 106  * removal of unused parameters.
 107  *
 108  * @b Note: This macro uses lexical capture to provide some arguments.
 109  * As a result, this macro should be used @b only within functions
 110  * defined by the COMMAND_HANDLER or COMMAND_HELPER macros.  Those
 111  * macros provide the expected lexical context captured by this macro.
 112  * Furthermore, it should be used only from the top-level of handler or
 113  * helper function, or care must be taken to avoid redefining the same
 114  * variables in intervening scope(s) by accident.
 115  */
 116 #define CALL_COMMAND_HANDLER(name, extra...) \
 117                 name(cmd, ##extra)
 118
 119 /**
 120  * Always use this macro to define new command handler functions.
 121  * It ensures the parameters are ordered, typed, and named properly, so
 122  * they be can be used by other macros (e.g. COMMAND_PARSE_NUMBER).
 123  * All command handler functions must be defined as static in scope.
 124  */
 125 #define COMMAND_HANDLER(name) static __COMMAND_HANDLER(name)
 126
 127 /**
 128  * Similar to COMMAND_HANDLER, except some parameters are expected.
 129  * A helper is globally-scoped because it may be shared between several
 130  * source files (e.g. the s3c24xx device command helper).
 131  */
 132 #define COMMAND_HELPER(name, extra...) __COMMAND_HANDLER(name, extra)
 133
 134 /**
 135  * Use this macro to access the context of the command being handled,
 136  * rather than accessing the variable directly.  It may be moved.
 137  */
 138 #define CMD_CTX cmd->ctx
 139 /**
 140  * Use this macro to access the number of arguments for the command being
 141  * handled, rather than accessing the variable directly.  It may be moved.
 142  */
 143 #define CMD_ARGC cmd->argc
 144 /**
 145  * Use this macro to access the arguments for the command being handled,
 146  * rather than accessing the variable directly.  It may be moved.
 147  */
 148 #define CMD_ARGV cmd->argv
 149 /**
 150  * Use this macro to access the name of the command being handled,
 151  * rather than accessing the variable directly.  It may be moved.
 152  */
 153 #define CMD_NAME cmd->name
 154
 155
 156 /// The type signature for commands' handler functions.
 157 typedef __COMMAND_HANDLER((*command_handler_t));
 158
 159 struct command
 160 {
 161         char *name;
 162         const char *help;
 163         struct command *parent;
 164         struct command *children;
 165         command_handler_t handler;
 166         enum command_mode mode;
 167         struct command *next;
 168 };
 169
 170 /**
 171  * @param c The command to be named.
 172  * @param delim The character to place between command names.
 173  * @returns A malloc'd string containing the full command name,
 174  * which may include one or more ancestor components.  Multiple names
 175  * are separated by single spaces.  The caller must free() the string
 176  * when done with it.
 177  */
 178 char *command_name(struct command *c, char delim);
 179
 180 /**
 181  * Register a command @c handler that can be called from scripts during
 182  * the execution @c mode specified.
 183  *
 184  * If @c parent is non-NULL, the new command will be registered as a
 185  * sub-command under it; otherwise, it will be available as a top-level
 186  * command.
 187  *
 188  * A conventioal format should be used for help strings, to provide both
 189  * usage and basic information:
 190  * @code
 191  * "@<options@> ... - some explanation text"
 192  * @endcode
 193  *
 194  * @param cmd_ctx The command_context in which to register the command.
 195  * @param parent Register this command as a child of this, or NULL to
 196  * register a top-level command.
 197  * @param name The name of the command to register, which must not have
 198  * been registered previously.
 199  * @param handler The callback function that will be called.  If NULL,
 200  * then the command serves as a placeholder for its children or a script.
 201  * @param mode The command mode(s) in which this command may be run.
 202  * @param help The help text that will be displayed to the user.
 203  * @returns The new command, if successful; otherwise, NULL.
 204  */
 205 struct command* register_command(struct command_context *cmd_ctx,
 206                 struct command *parent, const char *name,
 207                 command_handler_t handler, enum command_mode mode,
 208                 const char *help);
 209
 210 /**
 211  * Unregisters command @c name from the given context, @c cmd_ctx.
 212  * @param cmd_ctx The context of the registered command.
 213  * @param parent The parent of the given command, or NULL.
 214  * @param name The name of the command to unregister.
 215  * @returns ERROR_OK on success, or an error code.
 216  */
 217 int unregister_command(struct command_context *cmd_ctx,
 218                 struct command *parent, const char *name);
 219 /**
 220  * Unregisters all commands from the specfied context.
 221  * @param cmd_ctx The context that will be cleared of registered commands.
 222  * @param parent If given, only clear commands from under this one command.
 223  * @returns ERROR_OK on success, or an error code.
 224  */
 225 int unregister_all_commands(struct command_context *cmd_ctx,
 226                 struct command *parent);
 227
 228 void command_set_output_handler(struct command_context* context,
 229                 command_output_handler_t output_handler, void *priv);
 230
 231 struct command_context* copy_command_context(struct command_context* context);
 232
 233 int command_context_mode(struct command_context *context, enum command_mode mode);
 234
 235 /**
 236  * Creates a new command context using the startup TCL provided.
 237  */
 238 struct command_context* command_init(const char *startup_tcl);
 239 int command_done(struct command_context *context);
 240
 241 void command_print(struct command_context *context, const char *format, ...)
 242                 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 2, 3)));
 243 void command_print_sameline(struct command_context *context, const char *format, ...)
 244                 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 2, 3)));
 245 int command_run_line(struct command_context *context, char *line);
 246 int command_run_linef(struct command_context *context, const char *format, ...)
 247                 __attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 2, 3)));
 248 void command_output_text(struct command_context *context, const char *data);
 249
 250 void process_jim_events(void);
 251
 252 #define         ERROR_COMMAND_CLOSE_CONNECTION          (-600)
 253 #define         ERROR_COMMAND_SYNTAX_ERROR                      (-601)
 254 #define         ERROR_COMMAND_NOTFOUND                          (-602)
 255 #define         ERROR_COMMAND_ARGUMENT_INVALID          (-603)
 256 #define         ERROR_COMMAND_ARGUMENT_OVERFLOW         (-604)
 257 #define         ERROR_COMMAND_ARGUMENT_UNDERFLOW        (-605)
 258
 259 extern Jim_Interp *interp;
 260
 261 void register_jim(struct command_context *context, const char *name,
 262                 Jim_CmdProc cmd, const char *help);
 263
 264 int parse_ulong(const char *str, unsigned long *ul);
 265 int parse_ullong(const char *str, unsigned long long *ul);
 266
 267 int parse_long(const char *str, long *ul);
 268 int parse_llong(const char *str, long long *ul);
 269
 270 #define DECLARE_PARSE_WRAPPER(name, type) \
 271         int parse##name(const char *str, type *ul)
 272
 273 DECLARE_PARSE_WRAPPER(_uint, unsigned);
 274 DECLARE_PARSE_WRAPPER(_u32, uint32_t);
 275 DECLARE_PARSE_WRAPPER(_u16, uint16_t);
 276 DECLARE_PARSE_WRAPPER(_u8, uint8_t);
 277
 278 DECLARE_PARSE_WRAPPER(_int, int);
 279 DECLARE_PARSE_WRAPPER(_s32, int32_t);
 280 DECLARE_PARSE_WRAPPER(_s16, int16_t);
 281 DECLARE_PARSE_WRAPPER(_s8, int8_t);
 282
 283 /**
 284  * @brief parses the string @a in into @a out as a @a type, or prints
 285  * a command error and passes the error code to the caller.  If an error
 286  * does occur, the calling function will return the error code produced
 287  * by the parsing function (one of ERROR_COMMAND_ARGUMENT_*).
 288  *
 289  * This function may cause the calling function to return immediately,
 290  * so it should be used carefully to avoid leaking resources.  In most
 291  * situations, parsing should be completed in full before proceding
 292  * to allocate resources, and this strategy will most prevents leaks.
 293  */
 294 #define COMMAND_PARSE_NUMBER(type, in, out) \
 295         do { \
 296                 int retval = parse_##type(in, &(out)); \
 297                 if (ERROR_OK != retval) { \
 298                         command_print(CMD_CTX, stringify(out) \
 299                                 " option value ('%s') is not valid", in); \
 300                         return retval; \
 301                 } \
 302         } while (0)
 303
 304 /**
 305  * Parse the string @c as a binary parameter, storing the boolean value
 306  * in @c out.  The strings @c on and @c off are used to match different
 307  * strings for true and false options (e.g. "on" and "off" or
 308  * "enable" and "disable").
 309  */
 310 #define COMMAND_PARSE_BOOL(in, out, on, off) \
 311         do { \
 312                 bool value; \
 313                 int retval = command_parse_bool_arg(in, &value); \
 314                 if (ERROR_OK != retval) { \
 315                         command_print(CMD_CTX, stringify(out) \
 316                                 " option value ('%s') is not valid", in); \
 317                         command_print(CMD_CTX, "  choices are '%s' or '%s'", \
 318                                 on, off); \
 319                         return retval; \
 320                 } \
 321                 out = value; \
 322         } while (0)
 323
 324 int command_parse_bool_arg(const char *in, bool *out);
 325 COMMAND_HELPER(handle_command_parse_bool, bool *out, const char *label);
 326
 327 /// parses an on/off command argument
 328 #define COMMAND_PARSE_ON_OFF(in, out) \
 329                 COMMAND_PARSE_BOOL(in, out, "on", "off")
 330 /// parses an enable/disable command argument
 331 #define COMMAND_PARSE_ENABLE(in, out) \
 332                 COMMAND_PARSE_BOOL(in, out, "enable", "disable")
 333
 334 void script_debug(Jim_Interp *interp, const char *cmd,
 335                 unsigned argc, Jim_Obj *const *argv);
 336
 337 #endif /* COMMAND_H */