/**
* Parse one command line
* @param context
* @param data - complete command line
* @param len - command line length
* @return 1 if the last evaluated command was found
*/
int SCPI_Parse(scpi_t * context, char * data, int len) {
int result = 0;
scpi_parser_state_t * state;
int r;
scpi_token_t cmd_prev = {SCPI_TOKEN_UNKNOWN, NULL, 0};
if (context == NULL) {
return -1;
}
state = &context->parser_state;
context->output_count = 0;
while (1) {
result = 0;
r = scpiParser_detectProgramMessageUnit(state, data, len);
if (state->programHeader.type == SCPI_TOKEN_INVALID) {
SCPI_ErrorPush(context, SCPI_ERROR_INVALID_CHARACTER);
} else if (state->programHeader.len > 0) {
composeCompoundCommand(&cmd_prev, &state->programHeader);
if (findCommandHeader(context, state->programHeader.ptr, state->programHeader.len)) {
context->param_list.lex_state.buffer = state->programData.ptr;
context->param_list.lex_state.pos = context->param_list.lex_state.buffer;
context->param_list.lex_state.len = state->programData.len;
context->param_list.cmd_raw.data = state->programHeader.ptr;
context->param_list.cmd_raw.position = 0;
context->param_list.cmd_raw.length = state->programHeader.len;
processCommand(context);
result = 1;
cmd_prev = state->programHeader;
} else {
SCPI_ErrorPush(context, SCPI_ERROR_UNDEFINED_HEADER);
}
}
if (r < len) {
data += r;
len -= r;
} else {
break;
}
}
/* conditionaly write new line */
writeNewLine(context);
return result;
}
/**
* Interface to the application. Adds data to system buffer and try to search
* command line termination. If the termination is found or if len=0, command
* parser is called.
*
* @param context
* @param data - data to process
* @param len - length of data
* @return
*/
scpi_bool_t SCPI_Input(scpi_t * context, const char * data, int len) {
scpi_bool_t result = TRUE;
size_t totcmdlen = 0;
int cmdlen = 0;
if (len == 0) {
context->buffer.data[context->buffer.position] = 0;
result = SCPI_Parse(context, context->buffer.data, context->buffer.position);
context->buffer.position = 0;
} else {
int buffer_free;
buffer_free = context->buffer.length - context->buffer.position;
if (len > (buffer_free - 1)) {
/* Input buffer overrun - invalidate buffer */
context->buffer.position = 0;
context->buffer.data[context->buffer.position] = 0;
SCPI_ErrorPush(context, SCPI_ERROR_INPUT_BUFFER_OVERRUN);
return FALSE;
}
memcpy(&context->buffer.data[context->buffer.position], data, len);
context->buffer.position += len;
context->buffer.data[context->buffer.position] = 0;
while (1) {
cmdlen = scpiParser_detectProgramMessageUnit(&context->parser_state, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
totcmdlen += cmdlen;
if (context->parser_state.termination == SCPI_MESSAGE_TERMINATION_NL) {
result = SCPI_Parse(context, context->buffer.data, totcmdlen);
memmove(context->buffer.data, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
context->buffer.position -= totcmdlen;
totcmdlen = 0;
} else {
if (context->parser_state.programHeader.type == SCPI_TOKEN_UNKNOWN) break;
if (totcmdlen >= context->buffer.position) break;
}
}
}
return result;
}
/**
* Interface to the application. Adds data to system buffer and try to search
* command line termination. If the termination is found or if len=0, command
* parser is called.
*
* @param context
* @param data - data to process
* @param len - length of data
* @return
*/
int SCPI_Input(scpi_t * context, const char * data, int len) {
int result = 0;
size_t totcmdlen = 0;
int cmdlen = 0;
if (len == 0) {
context->buffer.data[context->buffer.position] = 0;
result = SCPI_Parse(context, context->buffer.data, context->buffer.position);
context->buffer.position = 0;
} else {
int buffer_free;
buffer_free = context->buffer.length - context->buffer.position;
if (len > (buffer_free - 1)) {
return -1;
}
memcpy(&context->buffer.data[context->buffer.position], data, len);
context->buffer.position += len;
context->buffer.data[context->buffer.position] = 0;
while (1) {
cmdlen = scpiParser_detectProgramMessageUnit(&context->parser_state, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
totcmdlen += cmdlen;
if (context->parser_state.termination == SCPI_MESSAGE_TERMINATION_NL) {
result = SCPI_Parse(context, context->buffer.data, totcmdlen);
memmove(context->buffer.data, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
context->buffer.position -= totcmdlen;
totcmdlen = 0;
} else {
if (context->parser_state.programHeader.type == SCPI_TOKEN_UNKNOWN) break;
if (totcmdlen >= context->buffer.position) break;
}
}
}
return result;
}
