cli.h

完整的Bell实验室的嵌入式文件系统TFS

/* cli.h:
 * Header file for Command Line Interface related stuff.
 *
 *  General notice:
 *  This code is part of a boot-monitor package developed as a generic base
 *  platform for embedded system designs.  As such, it is likely to be
 *  distributed to various projects beyond the control of the original
 *  author.  Please notify the author of any enhancements made or bugs found
 *  so that all may benefit from the changes.  In addition, notification back
 *  to the author will allow the new user to pick up changes that may have
 *  been made by other users after this version of the code was distributed.
 *
 *  Note1: the majority of this code was edited with 4-space tabs.
 *  Note2: as more and more contributions are accepted, the term "author"
 *         is becoming a mis-representation of credit.
 *
 *  Original author:    Ed Sutter
 *  Email:              [e-mail]
 *  Phone:              908-582-2351
 */
#ifndef _cli_h
#define _cli_h


#ifdef __cplusplus
extern "C" {
#endif

struct cliextra {
    int (*nextarg)();       /* Function that will print command's next arg. */
};

/* Command table structure used by the monitor:
 */
struct  monCommand {
    char    *name;          /* Name of command seen by user. */
    int     (*func)();      /* Function called when command is invoked. */
    char    **helptxt;      /* Help text (see notes below). */
    struct  cliextra *clix; /* Pointer to "extras" that may or may not be */ 
                            /* used by a specific command. */
};

#ifdef __cplusplus
}
#endif

/* Maximum size of a command line:
 */
#define CMDLINESIZE 128

/* Maximum number of arguments in a command line:
 */
#define ARGCNT      24

/* Definitions for docommand() return values:
 *
 * Note that the CMD_SUCCESS, CMD_FAILURE and CMD_PARAM_ERROR are return
 * values used by the local command code also.  The remaining errors
 * (CMD_LINE_ERROR, CMD_ULVL_DENIED and CMD_NOT_FOUND) are used only by
 # the docommand() function.
 *
 *  CMD_SUCCESS:
 *      Everything worked ok.
 *  CMD_FAILURE:
 *      Command parameters were valid, but command itself failed for some other
 *      reason. The docommand() function does not print a message here, it
 *      is assumed that the error message was printed by the local function.
 *  CMD_PARAM_ERROR:
 *      Command line did not parse properly.  Control was passed to a 
 *      local command function, but argument syntax caused it to choke.
 *      In this case docommand() will print out the generic CLI syntax error
 *      message.
 *  CMD_LINE_ERROR:
 *      Command line itself was invalid.  Too many args, invalid shell var
 *      syntax, etc.. Somekind of command line error prior to checking for
 *      the command name-to-function match.
 *  CMD_ULVL_DENIED:
 *      Command's user level is higher than current user level, so access
 *      is denied.
 *  CMD_NOT_FOUND:
 *      Since these same return values are used for each command function
 *      plus the docommand() function, this error indicates that docommand()
 *      could not even find the command in the command table.
 *  CMD_PREFILL:
 *      The final argument of the command line received was '?'.  The
 *      response to this is to ask the specific command for information
 *      about the next argument, so the command responds, the CLI returns
 *      with CMD_PREFILL to tell the getline() function to pre-fill the
 *      new line with the entered string.
 */
#define CMD_SUCCESS         0
#define CMD_FAILURE         -1
#define CMD_PARAM_ERROR     -2
#define CMD_LINE_ERROR      -3
#define CMD_ULVL_DENIED     -4
#define CMD_NOT_FOUND       -5
#define CMD_PREFILL         -6

/* Notes on help text array:
 * The monitor's CLI processor assumes that every command's help text 
 * array abides by a few basic rules...
 * First of all, it assumes that every array has AT LEAST two strings.
 * The first string in the array of strings is assumed to be a one-line
 * abstract describing the command.
 * The second string in the array of strings is assumed to be a usage
 * message that describes the syntax of the arguments needed by the command.
 * If this second string is an empty string (""), the docommand() prints out
 * a generic usage string indicating that there are no options or arguements
 * to apply to the command.
 * All remaining lines are formatted based on the needs of the individual
 * command and the final string is a null pointer to let the CLI processor
 * know where the end is.
 * Following is an example help text array...
 *
 *  char *HelpHelp[] = {
 *          "Display command set",
 *          "-[d] [commandname]",
 *          "Options:",
 *          " -d   list commands and descriptions",
 *          0,
 *  };
 *
 */
#endif