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.  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, and pcCommandString is the entire string as input by
the user (from which parameters can be extracted.*/
typedef portBASE_TYPE (*pdCOMMAND_LINE_CALLBACK)( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char * pcCommandString );

/* 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. */
	signed char cExpectedNumberOfParameters;			/* Commands expect a fixed number of parameters, which may be zero. */
} 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  );

/*-----------------------------------------------------------*/

/*
 * A buffer into which command outputs can be written is declared in the
 * main command interpreter, rather than in the command console implementation,
 * to allow application that provide access to the command console via multiple
 * interfaces to share a buffer, and therefore save RAM.  Note, however, that
 * the command interpreter itself is not re-entrant, so only one command
 * console interface can be used at any one time.  For that reason, no attempt
 * is made to provide any mutual exclusion mechanism on the output buffer.
 *
 * pcCmdIntGetOutputBuffer() returns the address of the output buffer.
 *
 * uxCmdIntGetOutputBufferSizeBytes() returns the size, in bytes, of the output
 * buffer returned by pcCmdIntGetOutputBuffer();
 */
signed char *pcCmdIntGetOutputBuffer( void );
unsigned portBASE_TYPE uxCmdIntGetOutputBufferSizeBytes( void );

/*
 * Return a pointer to the xParameterNumber'th word in pcCommandString.
 */
const signed char *pcCmdIntGetParameter( const signed char *pcCommandString, unsigned portBASE_TYPE uxWantedParameter, portBASE_TYPE *pxParameterStringLength );

#endif /* COMMAND_INTERPRETER_H */