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Command interpreter code updated to pass the command string into command hander functions.

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pull/4/head
Richard Barry 13 years ago
parent 255dd683d2
commit e7a1222c5f
2 changed files with 130 additions and 15 deletions
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127
Demo/Common/Utils/CommandInterpreter.c
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@ -71,7 +71,12 @@ typedef struct xCOMMAND_INPUT_LIST
* The callback function that is executed when "help" is entered. This is the
* only default command that is always present.
*/
static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen );
static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char *pcCommandString );
/*
* Return the number of parameters that follow the command name.
*/
static signed char prvGetNumberOfParameters( const signed char * pcCommandString );
/* The definition of the "help" command. This command is always at the front
of the list of registered commands. */
@ -79,7 +84,8 @@ static const xCommandLineInput xHelpCommand =
{
( const signed char * const ) "help",
( const signed char * const ) "help: Lists all the registered commands\r\n",
prvHelpCommand
prvHelpCommand,
0
};
/* The definition of the list of commands. Commands that are registered are
@ -146,7 +152,8 @@ portBASE_TYPE xReturn = pdFAIL;
portBASE_TYPE xCmdIntProcessCommand( const signed char * const pcCommandInput, signed char * pcWriteBuffer, size_t xWriteBufferLen )
{
static const xCommandLineInputListItem *pxCommand = NULL;
portBASE_TYPE xReturn;
portBASE_TYPE xReturn = pdTRUE;
const signed char *pcRegisteredCommandString;
/* Note: This function is not re-entrant. It must not be called from more
thank one task. */
@ -156,19 +163,37 @@ portBASE_TYPE xReturn;
/* Search for the command string in the list of registered commands. */
for( pxCommand = &xRegisteredCommands; pxCommand != NULL; pxCommand = pxCommand->pxNext )
{
if( strcmp( ( const char * ) pcCommandInput, ( const char * ) pxCommand->pxCommandLineDefinition->pcCommand ) == 0 )
pcRegisteredCommandString = pxCommand->pxCommandLineDefinition->pcCommand;
if( strncmp( ( const char * ) pcCommandInput, ( const char * ) pcRegisteredCommandString, strlen( ( const char * ) pcRegisteredCommandString ) ) == 0 )
{
/* 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 )
{
/* The command has been found, the loop can exit so the command
can be executed. */
if( prvGetNumberOfParameters( pcCommandInput ) != pxCommand->pxCommandLineDefinition->cExpectedNumberOfParameters )
{
xReturn = pdFALSE;
}
}
break;
}
}
}
if( pxCommand != NULL )
if( ( pxCommand != NULL ) && ( xReturn == pdFALSE ) )
{
/* The command was found, but the number of parameters with the command
was incorrect. */
strncpy( ( char * ) 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 );
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
@ -180,6 +205,7 @@ portBASE_TYPE xReturn;
}
else
{
/* pxCommand was NULL, the command was not found. */
strncpy( ( char * ) pcWriteBuffer, ( const char * const ) "Command not recognised. Enter \"help\" to view a list of available commands.\r\n\r\n", xWriteBufferLen );
xReturn = pdFALSE;
}
@ -200,11 +226,64 @@ unsigned portBASE_TYPE uxCmdIntGetOutputBufferSizeBytes( void )
}
/*-----------------------------------------------------------*/
static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen )
const signed char *pcCmdIntGetParameter( const signed char *pcCommandString, unsigned portBASE_TYPE uxWantedParameter, portBASE_TYPE *pxParameterStringLength )
{
unsigned portBASE_TYPE uxParametersFound = 0;
const signed char *pcReturn = NULL;
*pxParameterStringLength = 0;
while( uxParametersFound < uxWantedParameter )
{
/* Index the character pointer past the current word. If this is the start
of the command string then the first word is the command itself. */
while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) != ' ' ) )
{
pcCommandString++;
}
/* Find the start of the next string. */
while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) == ' ' ) )
{
pcCommandString++;
}
/* Was a string found? */
if( *pcCommandString != 0x00 )
{
/* Is this the start of the required parameter? */
uxParametersFound++;
if( uxParametersFound == uxWantedParameter )
{
/* How long is the parameter? */
pcReturn = pcCommandString;
while( ( ( *pcCommandString ) != 0x00 ) && ( ( *pcCommandString ) != ' ' ) )
{
( *pxParameterStringLength )++;
pcCommandString++;
}
break;
}
}
else
{
break;
}
}
return pcReturn;
}
/*-----------------------------------------------------------*/
static portBASE_TYPE prvHelpCommand( signed char *pcWriteBuffer, size_t xWriteBufferLen, const signed char *pcCommandString )
{
static const xCommandLineInputListItem * pxCommand = NULL;
signed portBASE_TYPE xReturn;
( void ) pcCommandString;
if( pxCommand == NULL )
{
/* Reset the pxCommand pointer back to the start of the list. */
@ -229,4 +308,34 @@ signed portBASE_TYPE xReturn;
return xReturn;
}
/*-----------------------------------------------------------*/
static signed char prvGetNumberOfParameters( const signed char * pcCommandString )
{
signed char cParameters = 0;
portBASE_TYPE xLastCharacterWasSpace = pdFALSE;
/* Count the number of space delimited words in pcCommandString. */
while( *pcCommandString != 0x00 )
{
if( ( *pcCommandString ) == ' ' )
{
if( xLastCharacterWasSpace != pdTRUE )
{
cParameters++;
xLastCharacterWasSpace = pdTRUE;
}
}
else
{
xLastCharacterWasSpace = pdFALSE;
}
pcCommandString++;
}
/* The value returned is one less than the number of space delimited words,
as the first word should be the command itself. */
return cParameters;
}

16
Demo/Common/Utils/CommandInterpreter.h
Unescape Escape View File

@ -55,11 +55,11 @@
#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 );
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. */
@ -68,6 +68,7 @@ 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;
/*
@ -110,6 +111,11 @@ portBASE_TYPE xCmdIntProcessCommand( const signed char * const pcCommandInput, s
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 */

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