/*-
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* Copyright (c) 2012-2013 Jan Breuer,
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*
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* All Rights Reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file scpi_parser.c
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* @date Thu Nov 15 10:58:45 UTC 2012
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*
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* @brief SCPI parser implementation
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*
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*
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*/
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#include <ctype.h>
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#include <string.h>
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#include "scpi/config.h"
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#include "scpi/parser.h"
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#include "scpi/lexer.h"
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#include "utils.h"
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#include "scpi/error.h"
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/**
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* Write data to SCPI output
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* @param context
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* @param data
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* @param len - lenght of data to be written
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* @return number of bytes written
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*/
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static size_t writeData(scpi_t * context, const char * data, size_t len) {
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return context->interface->write(context, data, len);
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}
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/**
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* Flush data to SCPI output
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* @param context
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* @return
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*/
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static int flushData(scpi_t * context) {
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if (context && context->interface && context->interface->flush) {
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return context->interface->flush(context);
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} else {
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return SCPI_RES_OK;
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}
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}
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/**
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* Write result delimiter to output
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* @param context
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* @return number of bytes written
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*/
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static size_t writeDelimiter(scpi_t * context) {
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if (context->output_count > 0) {
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return writeData(context, ", ", 2);
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} else {
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return 0;
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}
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}
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/**
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* Conditionaly write "New Line"
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* @param context
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* @return number of characters written
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*/
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static size_t writeNewLine(scpi_t * context) {
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if (context->output_count > 0) {
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size_t len;
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len = writeData(context, "\r\n", 2);
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flushData(context);
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return len;
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} else {
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return 0;
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}
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}
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/**
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* Process command
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* @param context
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*/
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static void processCommand(scpi_t * context) {
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const scpi_command_t * cmd = context->param_list.cmd;
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lex_state_t * state = &context->param_list.lex_state;
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context->cmd_error = FALSE;
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context->output_count = 0;
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context->input_count = 0;
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SCPI_DEBUG_COMMAND(context);
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/* if callback exists - call command callback */
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if (cmd->callback != NULL) {
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if ((cmd->callback(context) != SCPI_RES_OK) && !context->cmd_error) {
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SCPI_ErrorPush(context, SCPI_ERROR_EXECUTION_ERROR);
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}
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}
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/* conditionaly write new line */
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writeNewLine(context);
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/* set error if command callback did not read all parameters */
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if (state->pos < (state->buffer + state->len) && !context->cmd_error) {
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SCPI_ErrorPush(context, SCPI_ERROR_PARAMETER_NOT_ALLOWED);
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}
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}
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/**
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* Cycle all patterns and search matching pattern. Execute command callback.
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* @param context
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* @result TRUE if context->paramlist is filled with correct values
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*/
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static bool_t findCommandHeader(scpi_t * context, const char * header, int len) {
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int32_t i;
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const scpi_command_t * cmd;
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for (i = 0; context->cmdlist[i].pattern != NULL; i++) {
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cmd = &context->cmdlist[i];
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if (matchCommand(cmd->pattern, header, len)) {
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context->param_list.cmd = cmd;
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Parse one command line
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* @param context
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* @param data - complete command line
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* @param len - command line length
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* @return 1 if the last evaluated command was found
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*/
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int SCPI_Parse(scpi_t * context, const char * data, int len) {
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int result = 0;
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scpi_parser_state_t * state;
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int r;
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if (context == NULL) {
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return -1;
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}
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state = &context->parser_state;
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while (1) {
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result = 0;
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r = SCPI_DetectProgramMessageUnit(state, data, len);
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if (state->programHeader.type == TokInvalid) {
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SCPI_ErrorPush(context, SCPI_ERROR_UNEXPECTED_CHARACTER);
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} else if (state->programHeader.len > 0) {
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if (findCommandHeader(context, state->programHeader.ptr, state->programHeader.len)) {
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context->param_list.lex_state.buffer = state->programData.ptr;
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context->param_list.lex_state.pos = context->param_list.lex_state.buffer;
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context->param_list.lex_state.len = state->programData.len;
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processCommand(context);
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result = 1;
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_UNDEFINED_HEADER);
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}
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}
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if (r < len) {
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data += r;
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len -= r;
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} else {
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break;
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}
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}
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return result;
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}
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/**
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* Initialize SCPI context structure
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* @param context
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* @param command_list
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* @param buffer
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* @param interface
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*/
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void SCPI_Init(scpi_t * context) {
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context->buffer.position = 0;
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SCPI_ErrorInit(context);
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}
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/**
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* Interface to the application. Adds data to system buffer and try to search
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* command line termination. If the termination is found or if len=0, command
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* parser is called.
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*
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* @param context
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* @param data - data to process
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* @param len - length of data
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* @return
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*/
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int SCPI_Input(scpi_t * context, const char * data, int len) {
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int result = 0;
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size_t totcmdlen = 0;
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int cmdlen = 0;
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if (len == 0) {
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context->buffer.data[context->buffer.position] = 0;
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result = SCPI_Parse(context, context->buffer.data, context->buffer.position);
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context->buffer.position = 0;
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} else {
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int buffer_free;
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buffer_free = context->buffer.length - context->buffer.position;
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if (len > (buffer_free - 1)) {
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return -1;
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}
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memcpy(&context->buffer.data[context->buffer.position], data, len);
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context->buffer.position += len;
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context->buffer.data[context->buffer.position] = 0;
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while (1) {
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cmdlen = SCPI_DetectProgramMessageUnit(&context->parser_state, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
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totcmdlen += cmdlen;
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if (context->parser_state.termination == PmutNewLine) break;
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if (context->parser_state.programHeader.type == TokUnknown) break;
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if (totcmdlen >= context->buffer.position) break;
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}
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if (context->parser_state.termination == PmutNewLine) {
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result = SCPI_Parse(context, context->buffer.data, totcmdlen);
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memmove(context->buffer.data, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
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context->buffer.position -= totcmdlen;
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}
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}
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return result;
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}
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/* writing results */
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/**
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* Write raw string result to the output
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* @param context
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* @param data
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* @return
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*/
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size_t SCPI_ResultCharacters(scpi_t * context, const char * data, size_t len) {
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size_t result = 0;
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result += writeDelimiter(context);
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result += writeData(context, data, len);
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context->output_count++;
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return result;
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}
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/**
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* Write integer value to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultInt(scpi_t * context, int32_t val) {
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return SCPI_ResultIntBase(context, val, 10);
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}
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static const char * getBasePrefix(int8_t base) {
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switch (base) {
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case 2: return "#B";
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case 8: return "#Q";
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case 16: return "#H";
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default: return NULL;
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}
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}
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size_t SCPI_ResultIntBase(scpi_t * context, int32_t val, int8_t base) {
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char buffer[33];
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const char * basePrefix;
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size_t result = 0;
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size_t len;
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len = longToStr(val, buffer, sizeof (buffer), base);
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basePrefix = getBasePrefix(base);
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result += writeDelimiter(context);
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if (basePrefix != NULL) {
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result += writeData(context, basePrefix, 2);
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}
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result += writeData(context, buffer, len);
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context->output_count++;
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return result;
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}
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/**
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* Write double walue to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultDouble(scpi_t * context, double val) {
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char buffer[32];
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size_t result = 0;
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size_t len = doubleToStr(val, buffer, sizeof (buffer));
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result += writeDelimiter(context);
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result += writeData(context, buffer, len);
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context->output_count++;
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return result;
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}
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/**
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* Write string withn " to the result
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* @param context
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* @param data
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* @return
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*/
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size_t SCPI_ResultText(scpi_t * context, const char * data) {
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size_t result = 0;
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result += writeDelimiter(context);
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result += writeData(context, "\"", 1);
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result += writeData(context, data, strlen(data));
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result += writeData(context, "\"", 1);
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context->output_count++;
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return result;
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}
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/**
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* Write boolean value to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultBool(scpi_t * context, bool_t val) {
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return SCPI_ResultIntBase(context, val ? 1 : 0, 10);
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}
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/* parsing parameters */
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bool_t SCPI_Parameter(scpi_t * context, scpi_parameter_t * parameter, bool_t mandatory) {
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token_t token;
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lex_state_t * state;
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int32_t value;
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parameter->data.ptr = NULL;
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parameter->data.len = 0;
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parameter->number.value = 0;
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parameter->number.base = 10;
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parameter->number.unit = SCPI_UNIT_NONE;
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parameter->number.type = SCPI_NUM_NUMBER;
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parameter->type = TokUnknown;
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state = &context->param_list.lex_state;
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if (state->pos >= (state->buffer + state->len)) {
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if (mandatory) {
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SCPI_ErrorPush(context, SCPI_ERROR_MISSING_PARAMETER);
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} else {
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parameter->number.type = SCPI_NUM_DEF;
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parameter->type = TokProgramMnemonic; // TODO: select something different
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}
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return FALSE;
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}
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if (context->input_count != 0) {
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SCPI_LexComma(state, &token);
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if (token.type != TokComma) {
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_SEPARATOR);
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return FALSE;
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}
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}
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context->input_count++;
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SCPI_ParseProgramData(&context->param_list.lex_state, &token);
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parameter->type = token.type;
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parameter->data.ptr = token.ptr;
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parameter->data.len = token.len;
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switch (token.type) {
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case TokHexnum:
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parameter->number.base = 16;
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strToLong(token.ptr, &value, 16);
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parameter->number.value = value;
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return TRUE;
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case TokOctnum:
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parameter->number.base = 8;
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strToLong(token.ptr, &value, 8);
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parameter->number.value = value;
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return TRUE;
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case TokBinnum:
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parameter->number.base = 2;
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strToLong(token.ptr, &value, 2);
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parameter->number.value = value;
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return TRUE;
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case TokProgramMnemonic:
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return TRUE;
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case TokDecimalNumericProgramData:
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strToDouble(token.ptr, ¶meter->number.value);
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return TRUE;
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case TokDecimalNumericProgramDataWithSuffix:
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strToDouble(token.ptr, ¶meter->number.value);
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return TRUE;
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case TokArbitraryBlockProgramData:
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return TRUE;
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case TokSingleQuoteProgramData:
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// TODO: replace double "single qoute"
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return TRUE;
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case TokDoubleQuoteProgramData:
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// TODO: replace double "double qoute"
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return TRUE;
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case TokProgramExpression:
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return TRUE;
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default:
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parameter->type = TokUnknown;
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parameter->data.ptr = NULL;
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parameter->data.len = 0;
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SCPI_ErrorPush(context, SCPI_ERROR_UNKNOWN_PARAMETER);
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return FALSE;
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}
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}
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int32_t SCPI_ParamGetIntVal(scpi_t * context, scpi_parameter_t * parameter) {
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switch (parameter->type) {
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case TokHexnum:
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case TokOctnum:
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case TokBinnum:
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case TokDecimalNumericProgramData:
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case TokDecimalNumericProgramDataWithSuffix:
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return parameter->number.value;
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default:
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_PARAMETER);
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return 0;
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}
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}
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double SCPI_ParamGetDoubleVal(scpi_t * context, scpi_parameter_t * parameter) {
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return parameter->number.value;
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}
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void SCPI_ParamGetTextVal(scpi_t * context, scpi_parameter_t * parameter, const char ** data, int32_t * len) {
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*data = parameter->data.ptr;
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*len = parameter->data.len;
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}
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/* SCPI-99 7.3 Boolean Program Data */
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bool_t SCPI_ParamGetBoolVal(scpi_t * context, scpi_parameter_t * parameter) {
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switch (parameter->type) {
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case TokDecimalNumericProgramData:
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return parameter->number.value ? 1 : 0;
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case TokProgramMnemonic:
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if (compareStr("ON", 2, parameter->data.ptr, parameter->data.len)) {
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return TRUE;
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} else if (compareStr("OFF", 3, parameter->data.ptr, parameter->data.len)) {
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return FALSE;
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_PARAMETER);
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return FALSE;
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}
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default:
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_PARAMETER);
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return FALSE;
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}
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}
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int SCPI_ParseProgramData(lex_state_t * state, token_t * token) {
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token_t tmp;
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int result = 0;
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int wsLen;
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int suffixLen;
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int realLen = 0;
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realLen += SCPI_LexWhiteSpace(state, &tmp);
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if (result == 0) result = SCPI_LexNondecimalNumericData(state, token);
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if (result == 0) result = SCPI_LexCharacterProgramData(state, token);
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if (result == 0) {
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result = SCPI_LexDecimalNumericProgramData(state, token);
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if (result != 0) {
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wsLen = SCPI_LexWhiteSpace(state, &tmp);
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suffixLen = SCPI_LexSuffixProgramData(state, &tmp);
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if (suffixLen > 0) {
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token->len += wsLen + suffixLen;
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token->type = TokDecimalNumericProgramDataWithSuffix;
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result = token->len;
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}
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}
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}
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if (result == 0) result = SCPI_LexStringProgramData(state, token);
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if (result == 0) result = SCPI_LexArbitraryBlockProgramData(state, token);
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if (result == 0) result = SCPI_LexProgramExpression(state, token);
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realLen += SCPI_LexWhiteSpace(state, &tmp);
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return result + realLen;
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}
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int SCPI_ParseAllProgramData(lex_state_t * state, token_t * token, int * numberOfParameters) {
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int result;
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token_t tmp;
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int paramCount = 0;
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token->len = -1;
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token->type = TokAllProgramData;
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token->ptr = state->pos;
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for (result = 1; result != 0; result = SCPI_LexComma(state, &tmp)) {
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token->len += result;
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if (result == 0) {
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token->type = TokUnknown;
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token->len = 0;
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paramCount = -1;
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break;
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}
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result = SCPI_ParseProgramData(state, &tmp);
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if (tmp.type != TokUnknown) {
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token->len += result;
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} else {
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token->type = TokUnknown;
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token->len = 0;
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paramCount = -1;
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break;
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}
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paramCount++;
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}
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if (token->len == -1) {
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token->len = 0;
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}
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if (numberOfParameters != NULL) {
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*numberOfParameters = paramCount;
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}
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return token->len;
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}
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static void invalidateToken(token_t * token, const char * ptr) {
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token->len = 0;
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token->ptr = ptr;
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token->type = TokUnknown;
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}
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int SCPI_DetectProgramMessageUnit(scpi_parser_state_t * state, const char * buffer, int len) {
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lex_state_t lex_state;
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token_t tmp;
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int result = 0;
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lex_state.buffer = lex_state.pos = buffer;
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lex_state.len = len;
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state->numberOfParameters = 0;
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/* ignore whitespace at the begginig */
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SCPI_LexWhiteSpace(&lex_state, &tmp);
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if (SCPI_LexProgramHeader(&lex_state, &state->programHeader) >= 0) {
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if (SCPI_LexWhiteSpace(&lex_state, &tmp) > 0) {
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SCPI_ParseAllProgramData(&lex_state, &state->programData, &state->numberOfParameters);
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} else {
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invalidateToken(&state->programData, lex_state.pos);
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}
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} else {
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invalidateToken(&state->programHeader, lex_state.buffer);
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invalidateToken(&state->programData, lex_state.buffer);
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}
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if (result == 0) result = SCPI_LexNewLine(&lex_state, &tmp);
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if (result == 0) result = SCPI_LexSemicolon(&lex_state, &tmp);
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if (!SCPI_LexIsEos(&lex_state) && (result == 0)) {
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lex_state.pos++;
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state->programHeader.len = 1;
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state->programHeader.type = TokInvalid;
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invalidateToken(&state->programData, lex_state.buffer);
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}
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if (TokSemicolon == tmp.type) {
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state->termination = PmutSemicolon;
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} else if (TokNewLine == tmp.type) {
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state->termination = PmutNewLine;
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} else {
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state->termination = PmutNone;
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}
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return lex_state.pos - lex_state.buffer;
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}
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