FreeRTOS-Kernel/Demo/Common/Utils/CommandInterpreter.h

/*
    FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
	

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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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*/

#ifndef COMMAND_INTERPRETER_H
#define COMMAND_INTERPRETER_H

/* The prototype to which callback functions used to process command line
commands must comply.  This type will change when commands with parameters 
are included. */
typedef const signed char * (*pdCOMMAND_LINE_CALLBACK)( void );

/* The structure that defines command line commands.  A command line command
should be defined by declaring a const structure of this type. */
typedef struct xCOMMAND_LINE_INPUT
{
	const signed char * const pcCommand;			/* The command that causes pxCommandInterpreter to be executed.  For example "help".  Must be all lower case. */
	const signed char * const pcHelpString;			/* String that describes how to use the command.  Should start with the command itself, and end with "\r\n".  For exxample "help: Returns a list of all the commands\r\n". */
	pdCOMMAND_LINE_CALLBACK pxCommandInterpreter;	/* A pointer to the callback function that will return the output generated by the command. */
	const struct xCOMMAND_LINE_INPUT *pxNext;		/* A pointer to the next xCommandLinInput structure.  This should be NULL when the command is defined.  It will get filled in automatically when the command is registered. */
} xCommandLineInput;

/*
 * Register the command passed in using the pxCommandToRegister parameter.
 * Registering a command adds the command to the list of commands that are
 * handled by the command interpreter.  Once a command has been registered it
 * can be executed from the command line.
 */
void vCmdIntRegisterCommand( const xCommandLineInput *pxCommandToRegister );

/*
 * Runns the command interpreter for the command string "pcCommandInput".  If
 * pcCommandInput is valid (the command has been registered) a string will be 
 * returned, and pcCmdIntProcessCommand must then be called repeatedly until 
 * NULL is returned.  If pcCommand pcCommandInput is not valid (the command is
 * not recognised as a registered command) then an error message will be
 * returned - and again pcCmdIntProcessCommand() must be called repeatedly
 * until NULL is returned.
 *
 * pcCmdIntProcessCommand is not reentrant.  It must not be called from more
 * than one task - or at least - by more than one task at a time.
 */
const signed char *pcCmdIntProcessCommand( const signed char *pcCommandInput );

#endif /* COMMAND_INTERPRETER_H */