root / trunk / code / projects / colonet / ColonetServer / Command.cpp @ 156
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/**
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* @file Command.cpp
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*
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* @author Jason Knichel
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* @date 10/9/07
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*
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* @todo make it so command doesn't rely on connection pool. have methods
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* that may return a response return it by getting a response array passed in to them
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* that they fill in and then colonet server takes the contents of that response array
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* and sends it to the appropriate client
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*/
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#include <colonet_wireless.h> |
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#include <ctype.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "includes/Command.h" |
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#include "includes/ConnectionPool.h" |
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Command::Command(ConnectionPool * connection_pool_temp) { |
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connection_pool = connection_pool_temp; |
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} |
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Command::~Command() { |
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} |
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int Command::parse_command(char* command, int pool_index) { |
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char tokens[MAX_TOKENS][MAX_TOKEN_SIZE];
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int number_tokens = 0; |
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char* end_pointer = NULL; |
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int command_id;
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if (!connection_pool) {
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return -1; |
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} |
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if (!command) {
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return -1; |
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} |
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if (pool_index < 0) { |
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return -1; |
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} |
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if ((number_tokens = tokenize_command(command, tokens)) < 0) { |
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return -1; |
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} |
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//the 10 in the function call indicates number is base 10
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command_id = strtol(tokens[0], &end_pointer, 10); |
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if (!end_pointer || *end_pointer != '\0') { |
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printf("There was an error converting first token into a number.\n");
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return -1; |
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} |
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if (command_id == SEND_TO_ROBOT) {
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if (parse_send_to_robot(number_tokens, tokens, pool_index)) {
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return -1; |
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} |
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} else if (command_id == REQUEST_FROM_SERVER) { |
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if (parse_request_from_server(number_tokens, tokens, pool_index)) {
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return -1; |
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} |
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} |
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return 0; |
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} |
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/**
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* @brief Breaks a command up into tokens
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*
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* @param command The command to tokenize
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* @param tokens A two dimensional character array to store the tokens in
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*
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* @return 0 on success, negative error code on failure
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*/
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int Command::tokenize_command(char* command, char tokens[MAX_TOKENS][MAX_TOKEN_SIZE]) { |
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char* next_token = command;
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char* end_token = NULL; |
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int number_tokens = 0; |
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if (!command) {
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return -1; |
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} |
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while ((end_token = strstr(next_token, " "))) { |
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*end_token = '\0';
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if (strlen(next_token) > MAX_TOKEN_SIZE-1) { |
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return -1; |
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} |
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strcpy(tokens[number_tokens], next_token); |
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number_tokens++; |
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next_token = end_token + 1;
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while (isspace(*next_token) && *next_token != '\0') { |
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next_token++; |
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} |
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} |
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if (end_token == NULL && *next_token != '\0') { |
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if (strlen(next_token) > MAX_TOKEN_SIZE-1) { |
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return -1; |
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} |
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strcpy(tokens[number_tokens], next_token); |
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number_tokens++; |
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} |
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return number_tokens;
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} |
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/**
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* @brief checks a list of tokens to see if it's valid
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*
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* @param tokens The tokens to check
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* @param number_tokens The number of tokens contained in the tokens parameter
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*
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* @return 0 if tokens is valid
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*/
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int Command::check_tokens(unsigned char* tokens, int number_tokens) { |
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if (number_tokens > 3 + PACKET_DATA_LEN) { |
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/* Too many tokens */
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return -1; |
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} |
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if (number_tokens < 3) { |
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/* Not enough tokens */
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return -1; |
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} |
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if (tokens[1] != COLONET_REQUEST && tokens[1] != COLONET_COMMAND) { |
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/* Invalid message type */
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return -1; |
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} |
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return 0; |
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} |
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int Command::parse_send_to_robot(int number_tokens, char tokens[MAX_TOKENS][MAX_TOKEN_SIZE], int pool_index) { |
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int i;
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unsigned char int_tokens[MAX_TOKENS]; |
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int number_int_tokens = number_tokens;
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unsigned char arguments[PACKET_DATA_LEN]; |
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memset(arguments, 1, PACKET_DATA_LEN);
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// Convert tokens to ints
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for (i = ROBOT_COMMAND_OFFSET; i < number_int_tokens; i++) {
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int_tokens[i-ROBOT_COMMAND_OFFSET] = atoi(tokens[i]); |
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} |
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// Fill arguments buffer with arguments
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for (i = ROBOT_COMMAND_LEN; i < number_int_tokens-ROBOT_COMMAND_OFFSET; i++) {
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arguments[i-ROBOT_COMMAND_LEN] = int_tokens[i]; |
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} |
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// Check the tokens
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if (check_tokens(int_tokens, number_int_tokens) < 0) { |
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fprintf(stderr, "%s: Error - Invalid robot command/request.\n", __FUNCTION__);
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return -1; |
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} |
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// Send packet to robot
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fprintf(stderr, "Calling colonet_wl_send(%d, %d, %d, arguments)\n", int_tokens[0], int_tokens[1], int_tokens[2]); |
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colonet_wl_send(pool_index, int_tokens[0], (ColonetMessageType)int_tokens[1], int_tokens[2], arguments); |
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return 0; |
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} |
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int Command::parse_request_from_server(int number_tokens, char tokens[MAX_TOKENS][MAX_TOKEN_SIZE], int pool_index) { |
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char* end_pointer = NULL; |
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if (!connection_pool) {
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return -1; |
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} |
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if (number_tokens < 2) { |
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return -1; |
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} |
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end_pointer=NULL;
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int second_token = strtol(tokens[1], &end_pointer, 10); |
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if (!end_pointer || *end_pointer != '\0') { |
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printf("There was an error converting second token into a number.\n");
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return -1; |
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} |
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if (second_token == REQUEST_BOM_MATRIX) {
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if (parse_request_bom_matrix(pool_index)) {
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return -1; |
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} |
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} else if (second_token == REQUEST_XBEE_IDS) { |
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if (parse_request_xbee_ids(pool_index)) {
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return -1; |
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} |
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} else {
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char * my_current_message = "Hi, how are you?\n"; |
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printf("Sending %s\n", my_current_message);
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connection_pool->write_to_client(pool_index, my_current_message, strlen(my_current_message)); |
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} |
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return 0; |
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} |
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int Command::parse_request_bom_matrix(int pool_index) { |
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char response_bom_matrix_buffer[MAX_RESPONSE_LEN];
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char temp_bom_matrix_buffer[MAX_RESPONSE_LEN];
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if (!connection_pool) {
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return -1; |
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} |
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//TODO: change after we start keeping track of bom matrix
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/*
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int number_robots = rand()%10;
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int bom_matrix[number_robots][number_robots];
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for (int ii = 0; ii < number_robots; ii++) {
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for (int j = 0; j < number_robots; j++) {
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//do this to generate some -1 values which mean they can't see each other
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int matrix_value = rand()%(number_robots+1)-1;
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bom_matrix[ii][j] = matrix_value;
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}
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}
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*/
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int number_robots = 3; |
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int bom_matrix[number_robots][number_robots];
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for (int ii = 0; ii < number_robots; ii++) { |
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for (int j = 0; j < number_robots; j++) { |
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bom_matrix[ii][j] = ((ii*3+j)%17)-1; |
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} |
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} |
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printf("number of robots is %d\n", number_robots);
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//TODO: make this better
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//TODO: make sure I don't need to do MAX_RESPONSE_LENGTH-1
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snprintf(response_bom_matrix_buffer,MAX_RESPONSE_LEN, "%d %d %d", RESPONSE_TO_CLIENT_REQUEST, REQUEST_BOM_MATRIX, number_robots);
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for (int ii = 0; ii < number_robots; ii++) { |
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for (int j = 0; j < number_robots; j++) { |
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//TODO: don't use strcpy
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strcpy(temp_bom_matrix_buffer, response_bom_matrix_buffer); |
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//TODO: put length checking in here so array doesn't go out of bounds
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//TODO: maybe use strncat?
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strcat(temp_bom_matrix_buffer," %d");
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snprintf(response_bom_matrix_buffer, MAX_RESPONSE_LEN, temp_bom_matrix_buffer, bom_matrix[ii][j]); |
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} |
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} |
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strcat(response_bom_matrix_buffer,"\n");
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connection_pool->write_to_client(pool_index, response_bom_matrix_buffer, strlen(response_bom_matrix_buffer)); |
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printf("Sending %s", response_bom_matrix_buffer);
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return 0; |
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} |
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int Command::parse_request_xbee_ids(int pool_index) { |
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//TODO: make this better
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//TODO: change when we actually know this data
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//int number_robots = rand() % 10;
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int number_robots = 3; |
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char xbee_id_buffer[MAX_RESPONSE_LEN];
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char temp_xbee_id_buffer[MAX_RESPONSE_LEN];
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if (!connection_pool) {
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return -1; |
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} |
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snprintf(xbee_id_buffer, MAX_RESPONSE_LEN, "%d %d %d", RESPONSE_TO_CLIENT_REQUEST, REQUEST_XBEE_IDS, number_robots);
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printf("number of robots is %d\n", number_robots);
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for (int ii = 0; ii < number_robots; ii++) { |
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strcpy(temp_xbee_id_buffer, xbee_id_buffer); |
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//TODO: put length checking in here so array doesn't go out of bounds
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//TODO: maybe use strncat?
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strcat(temp_xbee_id_buffer, " %d");
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snprintf(xbee_id_buffer, MAX_RESPONSE_LEN, temp_xbee_id_buffer, ii); |
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} |
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strcat(xbee_id_buffer, "\n");
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connection_pool->write_to_client(pool_index, xbee_id_buffer, strlen(xbee_id_buffer)); |
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printf("Sending %s", xbee_id_buffer);
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return 0; |
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} |