Demo/Common/Utils/CommandInterpreter.h

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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.  pcWriteBuffer is a buffer into which the output from executing
the command can be written, xWriteBufferLen is the length, in bytes, of the
pcWriteBuffer buffer. */
typedef portBASE_TYPE (*pdCOMMAND_LINE_CALLBACK)( signed char *pcWriteBuffer, size_t xWriteBufferLen );

/* 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 example "help: Returns a list of all the commands\r\n". */
	const pdCOMMAND_LINE_CALLBACK pxCommandInterpreter;	/* A pointer to the callback function that will return the output generated by the command. */
} 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.
 */
portBASE_TYPE xCmdIntRegisterCommand( const xCommandLineInput * const pxCommandToRegister );

/*
 * Runs the command interpreter for the command string "pcCommandInput".  Any
 * output generated by running the command will be placed into pcWriteBuffer.
 * xWriteBufferLen must indicate the size, in bytes, of the buffer pointed to
 * by pcWriteBuffer.
 *
 * xCmdIntProcessCommand should be called repeatedly until it returns pdFALSE.
 *
 * 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.
 */
portBASE_TYPE xCmdIntProcessCommand( const signed char * const pcCommandInput, signed char * pcWriteBuffer, size_t xWriteBufferLen  );

#endif /* COMMAND_INTERPRETER_H */