BaseType_t FreeRTOS_CLIProcessCommand()

in AVR_Dx_MPLAB.X/cli/FreeRTOS_CLI.c [147:219]
48 lines of code
12 McCabe index (conditional complexity)

BaseType_t FreeRTOS_CLIProcessCommand( const char * const pcCommandInput, char * pcWriteBuffer, size_t xWriteBufferLen  )
{
static CLI_Definition_List_Item_t  *pxCommand = NULL;
BaseType_t xReturn = pdTRUE;
const char *pcRegisteredCommandString;
size_t xCommandStringLength;

	/* Note:  This function is not re-entrant.  It must not be called from more
	thank one task. */

	if( pxCommand == NULL )
	{
		/* Search for the command string in the list of registered commands. */
		for( pxCommand = &xRegisteredCommands; pxCommand != NULL; pxCommand = pxCommand->pxNext )
		{
			pcRegisteredCommandString = pxCommand->pxCommandLineDefinition->pcCommand;
			xCommandStringLength = strlen( pcRegisteredCommandString );

			/* To ensure the string lengths match exactly, so as not to pick up
			a sub-string of a longer command, check the byte after the expected
			end of the string is either the end of the string or a space before
			a parameter. */
			if( strncmp( pcCommandInput, pcRegisteredCommandString, xCommandStringLength ) == 0 )
			{
				if( ( pcCommandInput[ xCommandStringLength ] == ' ' ) || ( pcCommandInput[ xCommandStringLength ] == 0x00 ) )
				{
					/* The command has been found.  Check it has the expected
					number of parameters.  If cExpectedNumberOfParameters is -1,
					then there could be a variable number of parameters and no
					check is made. */
					if( pxCommand->pxCommandLineDefinition->cExpectedNumberOfParameters >= 0 )
					{
						if( prvGetNumberOfParameters( pcCommandInput ) != pxCommand->pxCommandLineDefinition->cExpectedNumberOfParameters )
						{
							xReturn = pdFALSE;
						}
					}

					break;
				}
			}
		}
	}

	if( ( pxCommand != NULL ) && ( xReturn == pdFALSE ) )
	{
		/* The command was found, but the number of parameters with the command
		was incorrect. */
		strncpy( pcWriteBuffer, "Incorrect command parameter(s).  Enter \"help\" to view a list of available commands.\r\n\r\n", xWriteBufferLen );
		pxCommand = NULL;
	}
	else if( pxCommand != NULL )
	{
		/* Call the callback function that is registered to this command. */
		xReturn = pxCommand->pxCommandLineDefinition->pxCommandInterpreter( pcWriteBuffer, xWriteBufferLen, pcCommandInput );

		/* If xReturn is pdFALSE, then no further strings will be returned
		after this one, and	pxCommand can be reset to NULL ready to search
		for the next entered command. */
		if( xReturn == pdFALSE )
		{
			pxCommand = NULL;
		}
	}
	else
	{
		/* pxCommand was NULL, the command was not found. */
		strncpy( pcWriteBuffer, "Command not recognised.  Enter 'help' to view a list of available commands.\r\n\r\n", xWriteBufferLen );
		xReturn = pdFALSE;
	}

	return xReturn;
}