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server.c
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server.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/msg.h>
#define TEXT_SIZE 100
#define SENTENCE_SIZE 35
#define WORD_SIZE 35
#define MAX_TEXT 512
#define MICRO_SEC_IN_SEC 1000000
static char text[TEXT_SIZE][SENTENCE_SIZE]; //keeps track of all the sentences in the server
static char responseText[BUFSIZ]; //used to save the response
static int size = 0; //keeps track of the size of the code
struct my_msg_st {
long int my_msg_type; //keeps track of the type of the message
char some_text[BUFSIZ]; //keeps track of the message
};
/* finds the sentence from a given command */
void findSentence(char* newCommand, char* sentence, int i){
int j = 0;
//removes the next line character
while (newCommand[i]!='\0'){
if (newCommand[i]!='\n'){
sentence[j] = newCommand[i];
j++;
}
i++;
}
sentence[j] = '\0';
}
/* finds the word from a given command */
void findWord(char* newCommand, char* word, int i){
int j = 0;
//gets rid of the white space after the word
while (newCommand[i]!='\0' && newCommand[i]!='\n' && newCommand[i]!=' '){
word[j] = newCommand[i];
j++;
i++;
}
word[j] = '\0';
}
/* adds the sentence to the text */
int append (char* newSentence){
//adds the sentence to the end of the text
//if it goes over the limit it replaces it
if (strlen(newSentence)<=35){
strcpy(text[(size++)%TEXT_SIZE], newSentence);
return 1;
}
else{
return 0;
}
}
/* displays all the sentences in the server */
void displayText(char* response, int isClient){
if (size == 0){
//if the server is empty
strcpy(response, "Nothing to display\n");
}
else {
//if the server is calling this it prints all the sentences in the text
int text_length = size;
// if the client is running this command it only prints the first 10 lines in the server to not exceed
// the maximum size of the message queue limit
if (isClient && size > 10){
text_length = 10;
}
//adds the period at the end of the sentence
for (int i=0; i<text_length; i++){
strcat(response, text[i]);
strcat(response, ".\n");
}
}
}
/* finds the first occurance of the sentence in the text */
int removeSentence (char* sentence){
int i = 0;
int found = 0;
for (; i<size; i++){
//finding the sentence
if (strcmp(text[i], sentence)==0){
strcpy(text[i], "");
found = 1;
break;
}
}
if (found){
// move the other sentences back
for (; i<size-1; i++){
strcpy(text[i], text[i+1]);
}
strcpy(text[i],"");
size--;
}
return found;
}
/* remove every occurance of a word for a given sentence */
int removeWordFromSentence (char* sentence, char* word, char* newSentence){
char * newWord= strtok(sentence, " ");
int wordLength = strlen(word);
int found = 0;
strcpy(newSentence, "");
while(newWord != NULL ) {
//if the word did not match add it to the new sentence
if (!strcmp(newWord, word)==0){
strcat(newSentence, newWord);
strcat(newSentence, " ");
}
else{
found = 1;
}
newWord = strtok(NULL, " ");
}
//removes the space at the end of the sentence
if (newSentence[strlen(newSentence)-1]==' '){
newSentence[strlen(newSentence)-1]='\0';
}
return found;
}
/* deletes every occurance of the word in the text */
int deleteWord (char* word){
int found =0;
int sentencesToDelete=0;
for (int i=0; i<size;i++){
//goes through every sentence and deletes the words
char newSentence[SENTENCE_SIZE];
if (removeWordFromSentence(text[i], word, newSentence)){
found = 1;
}
strcpy(text[i], newSentence);
if (strcmp(newSentence, "")==0){
sentencesToDelete++;
}
}
for (int i =0; i<sentencesToDelete; i++){
removeSentence("");
}
return found;
}
/* finds the first occurance of the word in the text */
int searchWord (char* word, char* foundSentence){
char * foundWord;
for (int i=0; i<size; i++){
foundWord = strstr(text[i], word);
int index = (int) (foundWord - text[i]);
if (foundWord && (index == 0 || text[i][index-1]==' ') && (index + strlen(word) - 1 == strlen(text[i])-1 || text[i][index+strlen(word)]==' ')){
strcpy(foundSentence, text[i]);
return 1;
}
}
return 0;
}
int main()
{
int running = 1;
int msgid1; //message queue used to receive data from the client
int msgid2; //message queue used to send data to the client
struct my_msg_st send_data;
struct my_msg_st receive_data;
long int msg_to_receive = 0;
msgid1 = msgget((key_t)7777, 0666 | IPC_CREAT);
if (msgid1 == -1) {
fprintf(stderr, "msgget failed with error: %d\n", errno);
exit(EXIT_FAILURE);
}
msgid2 = msgget((key_t)8888, 0666 | IPC_CREAT);
if (msgid2 == -1) {
fprintf(stderr, "msgget failed with error: %d\n", errno);
exit(EXIT_FAILURE);
}
char sentence[SENTENCE_SIZE] = ""; //keeps track of the sentence in the command
char word[WORD_SIZE] = ""; //keeps track of the word in the command
char buffer[BUFSIZ]; //used to sent the receive message
char timeVal[BUFSIZ];
while(running) {
//initializes sentence and word
strcpy(sentence,"");
strcpy(word, "");
strcpy(responseText, "");
//receives a command from the user
if (msgrcv(msgid1, (void *)&receive_data, BUFSIZ, msg_to_receive, 0) == -1) {
fprintf(stderr, "msgrcv failed with error: %d\n", errno);
exit(EXIT_FAILURE);
}
//if the command is append
if (strncmp(receive_data.some_text, "append", 6) == 0) {
findSentence(receive_data.some_text,sentence, 7); //extracts the sentence from the command
if (append(sentence)){ //adds the sentence to the list of commands
strcpy(responseText,"You added the following sentence: ");
strcat(responseText, sentence);
strcat(responseText, "\n");
}
else{
strcpy(responseText,"Your sentence was too long\n");
}
}
//if the command is delete
else if (strncmp(receive_data.some_text, "delete", 6) == 0) {
findWord(receive_data.some_text,word, 7); //extracts the word from the command
int didDelete = deleteWord(word);
if (didDelete){ //if the delete operation was successful
strcpy(responseText, "You deleted all the instances of ");
strcat(responseText, word);
strcat(responseText, "\n");
} else {
strcpy(responseText, "Did not find the word in the text :(\n");
}
}
//if the command is search
else if (strncmp(receive_data.some_text, "search", 6) == 0) {
findWord(receive_data.some_text,word, 7); //extracts the word from the command
int didFind = searchWord(word,sentence);
if (didFind){ //if search was successful
strcpy(responseText, "Here is the first occurance of ");
strcat(responseText, word);
strcat(responseText, ":\n");
strcat(responseText, sentence);
strcat(responseText, "\n");
} else {
strcpy(responseText, "Did not find the word in the text :(\n");
}
}
//if the command is remove
else if (strncmp(receive_data.some_text, "remove", 6) == 0) {
findSentence(receive_data.some_text,sentence, 7); //extracts the sentence from the command
int didRemove = removeSentence(sentence);
if (didRemove){ //if remove was successful
strcpy(responseText, "You removed the following sentence: ");
strcat(responseText, sentence);
strcat(responseText, "\n");
} else {
strcpy(responseText, "Could not find the sentence :(\n");
}
}
//if the command is end
else if (strncmp(receive_data.some_text, "end", 3) == 0) {
//prints everything in the server
displayText(responseText, 0);
printf("The final version of the text in the server:\n%s\n",responseText);
strcpy(responseText, "You have been disconnected\n");
running = 0;
}
/*
// the optional display command used for debugging
else if (strncmp(receive_data.some_text, "display", 7) == 0){
strcpy(responseText, "The text in the server as of now: \n");
displayText(responseText, 1);
}
*/
// if the commands is invalid
else {
strcpy(responseText, "Invalid command\n");
}
strcpy(send_data.some_text, responseText);
send_data.my_msg_type = 1;
if (msgsnd(msgid2, (void *)&send_data, MAX_TEXT, 0) == -1) {
fprintf(stderr, "msgsnd failed\n");
exit(EXIT_FAILURE);
}
}
//disconnecting both message queues
if (msgctl(msgid1, IPC_RMID, 0) == -1) {
fprintf(stderr, "msgctl(IPC_RMID) failed\n");
exit(EXIT_FAILURE);
}
if (msgctl(msgid2, IPC_RMID, 0) == -1) {
fprintf(stderr, "msgctl(IPC_RMID) failed\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}