user_id
stringlengths 24
24
| time
stringlengths 24
24
| feature_type
stringclasses 5
values | feature_version
stringclasses 2
values | input_question
stringlengths 1
1.24k
⌀ | input_code
stringlengths 2
18.5k
⌀ | input_intention
stringlengths 1
2.48k
⌀ | input_task_description
stringlengths 18
3.32k
⌀ |
|---|---|---|---|---|---|---|---|
63c6479f5f004bf4898cf545 | 2023-03-31T21:24:41.321Z | General Question | v2 | client: connect: Connection refused how to fix | null | null | null |
63c6479f5f004bf4898cf545 | 2023-03-31T21:28:58.340Z | General Question | v2 | what steps can i take to fix the error client: connect: Connection refused | null | null | null |
63c6479f5f004bf4898cf545 | 2023-04-05T19:21:59.212Z | Question from Code | v2 | how to change the error: initialization discards ‘const’ qualifier from pointer target type error | char *list_users(const User *curr) {
// Get the length of the returned string
int num_char = 0;
User *curr_user = curr; | null | null |
63c6479f5f004bf4898cf545 | 2023-04-05T19:29:49.417Z | Question from Code | v2 | help me fix this error | friends.c : 251 : 9 : error : format not a string literal and no format arguments[-Werror = format - security] 251 | num_bytes_written +=
snprintf(user_buf + num_bytes_written, num_char - num_bytes_written, print_post(curr)); // Append the post contents | null | null |
63c6479f5f004bf4898cf545 | 2023-04-06T13:51:02.998Z | Question from Code | v2 | will this handle partial reads, read one full line and then do something with the full line? | char *read(int client_index, struct sockname *users) {
int fd = users[client_index].sock.fd;
char buf[BUFSIZE + 1];
// Read user input and handle partial reads
int inbuf = 0; // Number of bytes in buf
int room = sizeof(buf); // How many bytes left in the buf
char *after = buf; // Pointer to the position after the data
int nbytes;
int command_read = 1; // Store if a full line has been read
while ((nbytes = read(fd, after, room)) > 0 || command_read == 1) {
inbuf += nbytes;
int where;
if ((where = find_network_newline(buf, inbuf)) > 0) { // When full line is read
buf[where - 2] = '\0'; // Null terminate the buffer
// Update inbuf
inbuf -= where;
// Move everything after the full
memmove(buf, buf + (sizeof(char) * where), inbuf);
command_read = 0;
}
// Update after and room
after = &buf[inbuf];
room = BUFSIZE - inbuf;
}
close(fd);
// Check for recieved username
if (users[client_index].username == NULL) {
users[client_index].username = malloc(sizeof(char) * strlen(buf) + 1);
if (users[client_index].username == NULL) {
perror("malloc");
free(users[client_index].username);
exit(1);
}
// Set the username
strcpy(users[client_index].username, buf);
users[client_index].username[strlen(buf) + 1] = '\0';
return NULL; // Return NULL if username was set
} else { // It is a command
int cmd_len = strlen(buf) + 1;
char *command = malloc(sizeof(char) * cmd_len);
if (command == NULL) {
perror("malloc");
exit(1);
}
strcpy(command, buf);
command[length] = '\0';
return command; // Return the command
}
} | null | null |
63c6479f5f004bf4898cf545 | 2023-04-06T20:28:55.085Z | Question from Code | v2 | why is this stuck in an infinite loop | char *read_input(int fd) {
char buf[INPUT_BUFFER_SIZE + 1];
// Read user input and handle partial reads
int inbuf = 0; // Number of bytes in buf
int room = sizeof(buf); // How many bytes left in the buf
char *after = buf; // Pointer to the position after the data
int nbytes;
int command_read = 1; // Store if a full line has been read
while ((nbytes = read(fd, after, room)) > 0 || command_read == 1) {
inbuf += nbytes;
int where;
if ((where = find_network_newline(buf, inbuf)) > 0) { // When full line is read
buf[where - 2] = '\0'; // Null terminate the buffer
// Update inbuf
inbuf -= where;
// Move everything after the full
memmove(buf, buf + (sizeof(char) * where), inbuf);
command_read = 0;
}
// Update after and room
after = &buf[inbuf];
room = INPUT_BUFFER_SIZE - inbuf;
// Check for closed connection
if (nbytes == 0) {
close(fd);
return NULL;
}
}
close(fd);
// Return the input
char *input = malloc(sizeof(char) * (strlen(buf) + 1));
if (input == NULL) {
perror("malloc");
exit(1);
}
strcpy(input, buf);
input[strlen(buf)] = '\0';
return input;
} | null | null |
63c6479f5f004bf4898cf545 | 2023-04-07T00:47:01.713Z | General Question | v2 | How do you use EWOULDBLOCK or EAGAIN to make sure read does not block | null | null | null |
63c6479f5f004bf4898cf545 | 2023-04-07T01:38:13.872Z | General Question | v2 | do i need to deal with the remaining data in buffer if I'm reading one line doing partial reads | null | null | null |
63c6479f5f004bf4898cf545 | 2023-04-07T01:39:51.103Z | Question from Code | v2 | can i delete the code that deals with the remaining data | // Read user input and handle partial reads
int inbuf = 0; // Number of bytes in buf
int room = sizeof(buf); // How many bytes left in the buf
char *after = buf; // Pointer to the position after the data
int nbytes;
while ((nbytes = read(fd, after, room)) > 0) {
inbuf += nbytes;
int where;
if ((where = find_network_newline(buf, inbuf)) > 0) { // When full line is read
buf[where - 2] = '\0'; // NULL terminate buff
// Handle remaining data in buffer
int remaining = inbuf - where;
char *rest = malloc(sizeof(char) * (remaining + 1));
if (rest == NULL) {
perror("malloc");
exit(1);
}
memcpy(rest, buf + where, remaining);
rest[remaining] = '\0';
// Return the input
char *input = malloc(sizeof(char) * (strlen(buf) + 1));
if (input == NULL) {
perror("malloc");
exit(1);
}
strcpy(input, buf);
input[strlen(buf)] = '\0';
// Free the rest and return
free(rest);
return input;
}
| null | null |
63c6479f5f004bf4898cf545 | 2023-04-07T01:48:48.794Z | Question from Code | v2 | am i passing in the correct user name into process_args | while (curr_client != NULL) {
if (curr_client->client_soc > -1 && FD_ISSET(curr_client->client_soc, &all_fds)) {
char *input = read_input(curr_client->client_soc);
if (input == NULL) { // If connection closed
printf("Client %d disconnected\n", client_count);
} else if (read_from(client_count, users, input) == 1) { // If input is a username
if (find_user(input, users_list) == NULL) { // Check for existing or new user
// Write a welcome message
char *welcome_msg;
if (curr_client->welcome_status == 0) {
welcome_msg = "Welcome\r\nEnter commands\r\n> "; // If first time user
} else {
welcome_msg = "Welcome back\r\nEnter commands\r\n> "; // If returning user
}
int write_error = write(curr_client->client_soc, welcome_msg, strlen(welcome_msg)); // Write the message to the client
if (write_error < 0) { // Error Checking
perror("write");
exit(1);
}
curr_client->welcome_status = 1; // Update to flag that user recieved a welcome message
}
} else { // If input is a command
// Process the arguments
char *cmd_argv[INPUT_ARG_MAX_NUM];
int cmd_argc = tokenize(input, cmd_argv, curr_client->client_soc);
if (cmd_argc > 0 && process_args(cmd_argc, cmd_argv, &users_list, users[client_count].username, curr_client->client_soc) == -1) {
break; // can only reach if quit command was entered
}
// Print the prompt arrow
char *prompt_arrow = "> ";
int write_error = write(curr_client->client_soc, prompt_arrow, strlen(prompt_arrow));
if (write_error < 0) {
perror("write");
exit(1);
}
}
}
client_count++; // Update the client count
--INSERT-- | null | null |
63c6479f5f004bf4898cf545 | 2023-04-07T01:54:26.837Z | Question from Code | v2 | how will the server know which user is using it | while (curr_client != NULL) {
if (curr_client->client_soc > -1 && FD_ISSET(curr_client->client_soc, &all_fds)) {
char *input = read_input(curr_client->client_soc);
if (input == NULL) { // If connection closed
printf("Client %d disconnected\n", client_count);
} else if (read_from(client_count, users, input) == 1) { // If input is a username
if (find_user(input, users_list) == NULL) { // Check for existing or new user
// Write a welcome message
char *welcome_msg;
if (curr_client->welcome_status == 0) {
welcome_msg = "Welcome\r\nEnter commands\r\n> "; // If first time user
} else {
welcome_msg = "Welcome back\r\nEnter commands\r\n> "; // If returning user
}
int write_error = write(curr_client->client_soc, welcome_msg, strlen(welcome_msg)); // Write the message to the client
if (write_error < 0) { // Error Checking
perror("write");
exit(1);
}
curr_client->welcome_status = 1; // Update to flag that user recieved a welcome message
}
} else { // If input is a command
// Process the arguments
char *cmd_argv[INPUT_ARG_MAX_NUM];
int cmd_argc = tokenize(input, cmd_argv, curr_client->client_soc);
if (cmd_argc > 0 && process_args(cmd_argc, cmd_argv, &users_list, users[client_count].username, curr_client->client_soc) == -1) {
break; // can only reach if quit command was entered
}
// Print the prompt arrow
char *prompt_arrow = "> ";
int write_error = write(curr_client->client_soc, prompt_arrow, strlen(prompt_arrow));
if (write_error < 0) {
perror("write");
exit(1);
}
}
}
client_count++; // Update the client count
--INSERT-- | null | null |
63c6479f5f004bf4898cf545 | 2023-04-10T23:26:03.572Z | Help Write Code | v2 | null | null | null | a function called read_input that handles partial reads and returns 1 full line (newline terminated) of input |
63c647a05f004bf4898cf54a | 2023-01-23T20:39:05.298Z | General Question | v1 | what is a pointer | null | null | null |
63c647a05f004bf4898cf54a | 2023-01-24T22:09:39.163Z | Help Fix Code | v1 | null | void fib(int **arr, int n){
*arr = malloc(sizeof(int)*(n));
for (int x = 0; x < n; x++){
if (x == 0){
*arr[x] = 0;
}
if (x == 1){
*arr[x] = 1;
}
} | I want to assign the second value of the array to 1. | null |
63c647a05f004bf4898cf54a | 2023-01-24T22:11:25.646Z | Help Fix Code | v1 | null | void fib(int **arr, int n){
*arr = malloc(sizeof(int)*(n));
for (int x = 0; x < n; x++){
if (x == 0){
*arr[x] = 0;
}
if (x == 1){
*arr[x] = 1;
}
} | I'm getting a cygwin_exception::open_stackdumpfile error | null |
63c647a05f004bf4898cf54a | 2023-01-24T22:16:30.746Z | Explain Code | v1 | null | void fib(int **arr, int n){
*arr = malloc(sizeof(int)*(n));
for (int x = 0; x < n; x++){
if (x == 0){
*arr[x] = 0;
}
else if (x == 1){
*arr[x] = 1;
}
else {
*arr[x] = *arr[x-1] + *arr[x-2];
printf("%d\n", *arr[x]);
}
}
} | null | null |
63c647a05f004bf4898cf54a | 2023-02-10T02:53:55.521Z | General Question | v1 | How do i cast a constant struct pointer to a struct pointer? | null | null | null |
63c647a05f004bf4898cf54a | 2023-02-10T02:56:49.239Z | Question from Code | v1 | Am I casting a constant to head? | User *find_user(const char *name, const User *head) {
while (head != NULL){
if (strncmp(name, head->name, MAX_NAME) == 0){
return (const User*)head;
}
head = head->next;
}
return NULL;
} | null | null |
63c647a05f004bf4898cf54a | 2023-02-10T03:05:09.922Z | Question from Code | v1 | Why am i getting a segmentation fault | int create_user(const char *name, User **user_ptr_add) {
if (strlen(name) >= MAX_NAME){
return 2;
}
while (*user_ptr_add != NULL){
if (strncmp(name, (*user_ptr_add)->name, MAX_NAME) == 0){
return 1;
}
if((*user_ptr_add)->next == NULL){
break;
}
*user_ptr_add = (*user_ptr_add)->next;
}
User *new_user = malloc(sizeof(User));
strncpy(new_user->name, name, MAX_NAME);
new_user->name[MAX_NAME-1] = '\0';
(*user_ptr_add)->next = new_user;
return 0; | null | null |
63c647a05f004bf4898cf54f | 2023-01-19T18:34:07.339Z | Help Fix Code | v1 | null | int sum_card(int **score_card, int size) {
// TODO: write the body of sum_card according to its description.
int sum = 0;
for (i=0; i<=size; i++) {
sum += **score_card[i];
}
return sum;
}
| null | null |
63c647a05f004bf4898cf54f | 2023-01-19T18:34:52.537Z | Help Fix Code | v1 | null | int sum_card(int **score_card, int size) {
// TODO: write the body of sum_card according to its description.
int sum = 0;
for (i=0; i<=size; i++) {
sum += *score_card[i];
}
return sum;
}
| null | null |
63c647a05f004bf4898cf54f | 2023-01-19T18:38:31.354Z | Help Fix Code | v1 | null | int sum_card(int **score_card, int size) {
// TODO: write the body of sum_card according to its description.
int sum = 0;
for (i=0; i<=size; i++) {
sum += *score_card[i];
}
return sum;
}
/*
* NOTE: don't change the main function!
* The command line arguments are a sequence of integers that will be
* used to initialize the array score_card.
*
* Sample usage:
* $ gcc -Wall -std=gnu99 -g -o score_card score_card.c
* $ ./score_card 10 -3 4
* Sum: 11
*/
int main(int argc, char **argv) {
int size = argc - 1;
int *score_card[size];
for (int i = 0; i < size; i++) {
// NOTE: We haven't covered malloc yet, so don't worry about this line.
score_card[i] = malloc(sizeof(int));
*(score_card[i]) = strtol(argv[i + 1], NULL, 10);
}
printf("Sum: %d\n", sum_card(score_card, size));
return 0;
}
| null | null |
63c647a05f004bf4898cf54f | 2023-01-19T19:49:23.743Z | Help Fix Code | v1 | null | int sum_card(int **score_card, int size) {
// TODO: write the body of sum_card according to its description.
int sum = 0;
for (int i=0; i<=size; i++) {
sum += *score_card[i];
}
return sum;
}
/*
* NOTE: don't change the main function!
* The command line arguments are a sequence of integers that will be
* used to initialize the array score_card.
*
* Sample usage:
* $ gcc -Wall -std=gnu99 -g -o score_card score_card.c
* $ ./score_card 10 -3 4
* Sum: 11
*/
int main(int argc, char **argv) {
int size = argc - 1;
int *score_card[size];
for (int i = 0; i < size; i++) {
// NOTE: We haven't covered malloc yet, so don't worry about this line.
score_card[i] = malloc(sizeof(int));
*(score_card[i]) = strtol(argv[i + 1], NULL, 10);
}
printf("Sum: %d\n", sum_card(score_card, size));
return 0;
}
| null | null |
63c647a05f004bf4898cf54f | 2023-01-19T20:58:57.094Z | Explain Code | v1 | null | int main(int argc, char **argv) {
int size = argc - 1;
int *score_card[size];
for (int i = 0; i < size; i++) {
// NOTE: We haven't covered malloc yet, so don't worry about this line.
score_card[i] = malloc(sizeof(int));
*(score_card[i]) = strtol(argv[i + 1], NULL, 10);
}
printf("Sum: %d\n", sum_card(score_card, size));
return 0;
} | null | null |
63c647a05f004bf4898cf54f | 2023-01-19T21:39:25.965Z | Explain Code | v1 | null | int sum_card(int **score_card, int size) {
// TODO: write the body of sum_card according to its description.
int sum = 0;
for (int i=0; i<=size; i++) {
sum += score_card[i];
}
return sum;
} | null | null |
63c647a35f004bf4898cf568 | 2023-01-31T04:06:04.090Z | Question from Code | v1 | Is this a valid way to truncate a string
| strncpy(s, s, n); | null | null |
63c647a35f004bf4898cf568 | 2023-02-13T21:55:52.254Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
typedef struct user {
char name[32];
char profile_pic[32];
struct post *first_port;
struct user *friends[10];
struct user *next;
} User;
User this_user;
this_user.next = NULL;
/* Need to check if name can be fully copied over. */
if (strlen(name) > sizeof(this_user.name) - 1) {
return 2;}
/* Case 1: I am the first user. user_ptr_add is NULL? the linked list is empty. */
if (*user_ptr_add == NULL) {
strncpy(this_user.name, name, sizeof(this_user.name));
this_user.name[31] = '\0';
*user_ptr_add = &this_user;
return 0;
}
/* Case 2: linked list already contains users. */
User *curr = *user_ptr_add;
/* Find the last node <- its next is NULL. */
while (curr->next != NULL) {
/* Check for duplicate names. */
if (strcmp(curr->name, name) == 0) {
return 1;
} curr = curr->next;
} curr->next = &this_user;
strncpy(this_user.name, name, sizeof(this_user.name));
this_user.name[31] = '\0';
return -1;
} | Create a new user with the given name. Insert it at the tail of the list of users whose head is pointed to by *user_ptr_add.
Return:
- 0 if successful
- 1 if a user by this name already exists in this list
- 2 if the given name cannot fit in the 'name' array (don't forget about the null terminator)
| null |
63c647a35f004bf4898cf568 | 2023-02-13T22:06:18.020Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
/* Need to check if name can be fully copied over. */
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
/* Case 1: I am the first user. user_ptr_add is NULL? the linked list is empty. */
if (*user_ptr_add == NULL) {
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
*user_ptr_add = this_user;
return 0;
}
/* Case 2: linked list already contains users. */
User *curr = *user_ptr_add;
/* Find the last node <- its next is NULL. */
while (curr->next != NULL) {
/* Check for duplicate names. */
if (strcmp(curr->name, name) == 0) {
return 1;
} curr = curr->next;
} curr->next = this_user;
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
return -1;
} | Create a new user with the given name. Insert it at the tail of the list of users whose head is pointed to by *user_ptr_add. Return: - 0 if successful - 1 if a user by this name already exists in this list - 2 if the given name cannot fit in the 'name' array (don't forget about the null terminator) | null |
63c647a35f004bf4898cf568 | 2023-02-13T22:07:35.683Z | Question from Code | v1 | I got an error: Undefined symbols for architecture arm64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
How do I resolve this? | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
/* Need to check if name can be fully copied over. */
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
/* Case 1: I am the first user. user_ptr_add is NULL? the linked list is empty. */
if (*user_ptr_add == NULL) {
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
*user_ptr_add = this_user;
return 0;
}
/* Case 2: linked list already contains users. */
User *curr = *user_ptr_add;
/* Find the last node <- its next is NULL. */
while (curr->next != NULL) {
/* Check for duplicate names. */
if (strcmp(curr->name, name) == 0) {
return 1;
} curr = curr->next;
} curr->next = this_user;
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
return -1;
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T00:51:04.073Z | Explain Code | v1 | null | void list_users(const User *curr) {
while (curr != NULL) {
printf(curr->name);
curr = curr->next;
}
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T00:51:42.488Z | Help Fix Code | v1 | null | void list_users(const User *curr) {
while (curr != NULL) {
printf(curr->name);
curr = curr->next;
}
} | Print the usernames of all users in the list starting at curr. Names should be printed to standard output, one per line. Is there anything to be fixed? | null |
63c647a35f004bf4898cf568 | 2023-02-14T00:52:34.852Z | Help Fix Code | v1 | null | User *find_user(const char *name, const User *head) {
User *curr = (User *)head;
while (curr != NULL) {
if (strcmp(curr->name, name) == 0){
return &curr;
} curr = curr->next;
}
return NULL;
} | Return a pointer to the user with this name in the list starting with head. Return NULL if no such user exists. NOTE: You'll likely need to cast a (const User *) to a (User *) to satisfy the prototype without warnings. Is there anything to fix? | null |
63c647a35f004bf4898cf568 | 2023-02-14T00:53:46.285Z | Help Fix Code | v1 | null | User *find_user(const char *name, const User *head) {
User *curr = (User *)head;
while (curr != NULL) {
if (strcmp(curr->name, name) == 0){
return curr;
} curr = curr->next;
}
return NULL;
} | Return a pointer to the user with this name in the list starting with head. Return NULL if no such user exists. NOTE: You'll likely need to cast a (const User *) to a (User *) to satisfy the prototype without warnings. Is there anything to fix? | null |
63c647a35f004bf4898cf568 | 2023-02-14T01:52:28.153Z | Help Fix Code | v1 | null | int update_pic(User *user, const char *filename) {
/* Check if filename is too long. */
if (strlen(filename) > sizeof(user->profile_pic) - 1) {
return 2;
} elif (fopen(filename, "r") == NULL) {
return 1;
} else {
user->profile_pic = filename;
return 0;
}
} | Change the filename for the profile pic of the given user. Return:
- 0 on success.
- 1 if the file does not exist or cannot be opened.
- 2 if the filename is too long. | null |
63c647a35f004bf4898cf568 | 2023-02-14T01:56:17.495Z | Explain Code | v1 | null | int update_pic(User *user, const char *filename) {
/* Check if filename is too long. */
if (strlen(filename) > sizeof(user->profile_pic) - 1) {
return 2;
} else if (fopen(filename, "r") == NULL) {
return 1;
} else {
strncpy(user->profile_pic, filename, sizeof(user->profile_pic));
return 0;
}
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T01:57:20.258Z | Question from Code | v1 | If the file does not exist, will fopen() also return NULL? | int update_pic(User *user, const char *filename) {
/* Check if filename is too long. */
if (strlen(filename) > sizeof(user->profile_pic) - 1) {
return 2;
} else if (fopen(filename, "r") == NULL) {
return 1;
} else {
strncpy(user->profile_pic, filename, sizeof(user->profile_pic));
return 0;
}
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T02:07:55.799Z | Help Fix Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
this_user->first_post = NULL;
/* Need to check if name can be fully copied over. */
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
/* Case 1: I am the first user. user_ptr_add is NULL? the linked list is empty. */
if (*user_ptr_add == NULL) {
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
*user_ptr_add = this_user;
return 0;
}
/* Case 2: linked list already contains users. */
User *curr = *user_ptr_add;
/* Find the last node <- its next is NULL. */
while (curr->next != NULL) {
/* Check for duplicate names. */
if (strcmp(curr->name, name) == 0) {
return 1;
} curr = curr->next;
} curr->next = this_user;
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
return 0;
} | Create a new user with the given name. Insert it at the tail of the list of users whose head is pointed to by *user_ptr_add. Return: - 0 if successful - 1 if a user by this name already exists in this list - 2 if the given name cannot fit in the 'name' array (don't forget about the null terminator)
However, my code is failing in the case where the name is already in the list. I think the while loop is not working. It does not loop from the head of the linked list. | null |
63c647a35f004bf4898cf568 | 2023-02-14T02:20:03.693Z | Question from Code | v1 | I have this pointer to the head of a linked list, how do I traverse the linked list? | User **user_ptr_add | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T02:24:21.196Z | Explain Code | v1 | null | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
this_user->first_post = NULL;
/* Need to check if name can be fully copied over. */
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
/* Case 1: I am the first user. user_ptr_add is NULL? the linked list is empty. */
if (*user_ptr_add == NULL) {
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
*user_ptr_add = this_user;
return 0;
}
/* Case 2: linked list already contains users. */
User *curr = *user_ptr_add;
/* Find the last node <- its next is NULL. */
while (curr != NULL) {
/* Check for duplicate names. */
if (strcmp(curr->name, name) == 0) {
printf("%s\n", curr->name);
return 1;
}
// if (curr->next == NULL) {
// curr->next = this_user;
// }
curr = curr->next;
} curr = this_user;
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
return 0;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-14T03:32:54.407Z | Question from Code | v1 | Is friends a pointer to an array that stores 1o user structs? | #define MAX_NAME 32 // Max username and profile_pic filename lengths
#define MAX_FRIENDS 10
typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T03:35:04.694Z | General Question | v1 | if I have an array of pointers, how can I determine its size? | null | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T23:21:38.318Z | Question from Code | v1 | How do i initialize a time_t | typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *this_post = malloc(sizeof(Post));
strcpy(this_post->author, author->name);
this_post->contents = contents; | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T23:22:31.525Z | Question from Code | v1 | Is this the correct way to initialize a time_t? | typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *this_post = malloc(sizeof(Post));
strcpy(this_post->author, author->name);
this_post->contents = contents;
this_post->time_t = time(NULL); | null | null |
63c647a35f004bf4898cf568 | 2023-02-14T23:24:14.102Z | Question from Code | v1 | How do I initialize a time_t? I did that and got this error: incompatible integer to pointer conversion assigning to 'time_t *' (aka 'long *') from 'time_t' (aka 'long') | typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *this_post = malloc(sizeof(Post));
strcpy(this_post->author, author->name);
this_post->contents = contents;
this_post->date = time(NULL); | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T17:23:38.274Z | Help Fix Code | v1 | null | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
int delete_user(const char *name, User **user_ptr_del) {
User *this_user = find_user(name, *user_ptr_del);
// Case 1: User with this name does not exist
if (this_user == NULL) {
return 1;
}
// Case 0: Delete user
// Remove user from each friend's friend list
int this_user_idx;
for (int i = 0; i < sizeof(this_user->friends)/sizeof(this_user->friends[0]); i++) {
// Find the index of this_user
User *frd = this_user->friends[i];
for (int j = 0; j < sizeof(frd->friends)/sizeof(frd->friends[0]); j++) {
if (frd->friends[j] == this_user) {
this_user_idx = j;
}
} printf("%d", this_user_idx);
} | I keep getting a seg fault in line 22 where I want to take this_user's friend list, loop through each friend, and find this_user's index in the friend's friend list. | null |
63c647a35f004bf4898cf568 | 2023-02-15T17:27:05.488Z | Help Fix Code | v1 | null | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
int delete_user(const char *name, User **user_ptr_del) {
User *this_user = find_user(name, *user_ptr_del);
// Case 1: User with this name does not exist
if (this_user == NULL) {
return 1;
}
// Case 0: Delete user
// Remove user from each friend's friend list
int this_user_idx;
for (int i = 0; i < MAX_FRIENDS; i++) {
// Find the index of this_user
User *frd = this_user->friends[i];
for (int j = 0; j < MAX_FRIENDS; j++) {
if (frd->friends[j] == this_user) {
this_user_idx = j;
}
} printf("%d", this_user_idx);
} | I keep getting a seg fault in line 22 where I want to take this_user's friend list, loop through each friend, and find this_user's index in the friend's friend list. | null |
63c647a35f004bf4898cf568 | 2023-02-15T17:28:29.429Z | Question from Code | v1 | I keep getting a seg fault in line 22. I want to take this_user's friend list, loop through each friend, and find this_user's index in the friend's friend list. | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
int delete_user(const char *name, User **user_ptr_del) {
User *this_user = find_user(name, *user_ptr_del);
// Case 1: User with this name does not exist
if (this_user == NULL) {
return 1;
}
// Case 0: Delete user
// Remove user from each friend's friend list
int this_user_idx;
for (int i = 0; i < MAX_FRIENDS; i++) {
// Find the index of this_user
User *frd = this_user->friends[i];
for (int j = 0; j < MAX_FRIENDS; j++) {
if (frd->friends[j] == this_user) {
this_user_idx = j;
}
} printf("%d", this_user_idx);
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T21:01:22.117Z | Question from Code | v1 | I want to free the memory in the heap but I am getting a memory leak. | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *curr_post = this_user->first_post;
while (curr_post != NULL) {
Post* next_post = curr_post->next;
free(curr_post->contents);
free(curr_post->date);
free(curr_post);
curr_post = next_post;
}
free(this_user); | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T21:03:26.305Z | Question from Code | v1 | Still getting a memory leak
| typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *curr_post = this_user->first_post;
while (curr_post != NULL) {
Post* next_post = curr_post->next;
free(curr_post->contents);
free(curr_post->date);
free(curr_post);
curr_post = next_post;
}
free(this_user->next);
free(this_user); | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T21:07:43.306Z | Question from Code | v1 | Do I need to free the friends array that is an array of pointers pointing to User structs | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *curr_post = this_user->first_post;
while (curr_post != NULL) {
Post* next_post = curr_post->next;
free(curr_post->contents);
free(curr_post->date);
free(curr_post);
curr_post = next_post;
}
free(this_user->next);
free(this_user); | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T21:08:39.696Z | Question from Code | v1 | Do I need to free the next pointer in this_user? It points to the next user struct in the linked list. | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
Post *curr_post = this_user->first_post;
while (curr_post != NULL) {
Post* next_post = curr_post->next;
free(curr_post->contents);
free(curr_post->date);
free(curr_post);
curr_post = next_post;
}
free(this_user->next);
free(this_user); | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T23:27:35.592Z | Question from Code | v1 | Is this how to allocate space for a User? | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
typedef struct post {
char author[MAX_NAME];
char *contents;
time_t *date;
struct post *next;
} Post;
User *this_user = malloc(sizeof(User));
| null | null |
63c647a35f004bf4898cf568 | 2023-02-15T23:50:40.175Z | Question from Code | v1 | I think I called malloc twice but I don't know where | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
this_user->first_post = NULL;
strcpy(this_user->profile_pic, "\0");
for (int i = 0; i < MAX_FRIENDS; i++) {
this_user->friends[i] = NULL;
}
// Case 2: Check if name can be fully copied over.
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
// Case 1: User exists in linked list.
if (find_user(name, *user_ptr_add) != NULL) {
return 1;
}
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
// Case 0: (a) Linked list is empty
if (*user_ptr_add == NULL) {
*user_ptr_add = this_user;
} else {
// Case 0: (b) Linked list is not empty
User *curr = *user_ptr_add;
while (curr->next != NULL) {
curr = curr->next;
} curr->next = this_user;
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-15T23:56:27.511Z | Question from Code | v1 | Did I implicitly called malloc more than once? | int create_user(const char *name, User **user_ptr_add) {
User *this_user = malloc(sizeof(User));
this_user->next = NULL;
this_user->first_post = NULL;
strcpy(this_user->profile_pic, "\0");
for (int i = 0; i < MAX_FRIENDS; i++) {
this_user->friends[i] = NULL;
}
// Case 2: Check if name can be fully copied over.
if (strlen(name) > sizeof(this_user->name) - 1) {
return 2;}
// Case 1: User exists in linked list.
if (find_user(name, *user_ptr_add) != NULL) {
return 1;
}
strncpy(this_user->name, name, sizeof(this_user->name));
this_user->name[31] = '\0';
// Case 0: (a) Linked list is empty
if (*user_ptr_add == NULL) {
*user_ptr_add = this_user;
} else {
// Case 0: (b) Linked list is not empty
User *curr = *user_ptr_add;
while (curr->next != NULL) {
curr = curr->next;
} curr->next = this_user;
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-02-16T01:07:09.375Z | Question from Code | v1 | What happens to my this_user->profile_pic after this line of code? | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME]; // This is a *filename*, not the file contents.
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
strcpy(this_user->profile_pic, "\0"); | null | null |
63c647a35f004bf4898cf568 | 2023-02-17T04:59:51.349Z | Question from Code | v1 | does this code have the same implementation as strncpy? | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
}
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:01:33.343Z | Question from Code | v1 | Does this code do what it is supposed to do: Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
}
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:02:59.804Z | Question from Code | v1 | Does this code do what it is supposed to do: Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[-1] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:04:11.712Z | Question from Code | v1 | Does this code do what it is supposed to do: Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity; i++) {
dest[i] = src[i];
} dest[-1] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:05:01.449Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity; i++) {
dest[i] = src[i];
} dest[-1] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated.
How can I fix the code? | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:06:08.699Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[-1] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. How can I fix the code? | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:06:58.068Z | Help Fix Code | v1 | null | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[capacity] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. How can I fix the code? | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:07:46.571Z | Question from Code | v1 | How do I add a null terminator to the end of the string? | char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[capacity] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:08:31.261Z | Question from Code | v1 | How do I add a null terminator to the end of the string? | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[capacity] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:10:00.366Z | Help Fix Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
memset(dest, '\0', capacity);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[capacity/sizeof(dest)] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest.
Does this code do what it is supposed to do? | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:21:36.308Z | Question from Code | v1 | Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. Does this code do what it is supposed to do? | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
int n = capacity/sizeof(dest)[0];
memset(dest, '\0', n);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[n] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:22:24.126Z | Question from Code | v1 | Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. Does this code do what it is supposed to do? | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
int n = capacity/sizeof(dest)[0];
memset(dest, '\0', n);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < n && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[n] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| null | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:23:41.111Z | Help Fix Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
int n = capacity/sizeof(dest)[0];
memset(dest, '\0', n);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < n && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[n] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:24:16.044Z | Help Fix Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
int n = capacity/sizeof(dest)[0];
memset(dest, '\0', n);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < n && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[n] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:24:47.834Z | Help Fix Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
int n = capacity/sizeof(dest)[0];
memset(dest, '\0', n);
// Case 1: dest < src; cannot fully copy over, need to null terminate
for (int i = 0; i < n && src[i] != '\0'; i++) {
dest[i] = src[i];
} dest[n] = '\0';
// Case 2: dest > src; have space left in dest
// Already memset so no need to worry
return dest;
}
| Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest. | null |
63c647a35f004bf4898cf568 | 2023-02-17T05:55:45.606Z | Help Fix Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
// Case 1: dest < src; cannot fully copy over, need to null terminate
int i;
for (i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
}
for ( ; i < capacity; i++) {
dest[i] = '\0';}
dest[capacity - 1] = '\0';
// Case 2: dest > src; have space left in dest
return dest;
} | Write the copy function to perform exactly as strncpy does, with one exception: your copy function will guarantee that dest is always null-terminated. Capacity is expected to be the number of bytes of memory allocated to dest.
| null |
63c647a35f004bf4898cf568 | 2023-02-17T05:56:39.200Z | Explain Code | v1 | null | /* Write the copy function to perform exactly as strncpy does, with one
exception: your copy function will guarantee that dest is always
null-terminated. Capacity is expected to be the number of bytes of
memory allocated to dest.
You shoud read the man page to learn how strncpy works.
NOTE: You must write this function without using any string functions.
The only function that should depend on string.h is memset.
*/
char *copy(char *dest, const char *src, int capacity) {
// Case 1: dest < src; cannot fully copy over, need to null terminate
int i;
for (i = 0; i < capacity && src[i] != '\0'; i++) {
dest[i] = src[i];
}
for ( ; i < capacity; i++) {
dest[i] = '\0';}
dest[capacity - 1] = '\0';
// Case 2: dest > src; have space left in dest
return dest;
} | null | null |
63c647a35f004bf4898cf568 | 2023-03-03T20:25:12.960Z | Question from Code | v1 | I am trying to make it such that only the parent can call fork(), but I am stuck. | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int pid;
for (int i = 0; i < iterations; i++) {
if (i = 0) {
int n = fork();
if (n != 0) {
pid = getppid();
}
}
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-03-03T20:26:42.554Z | Question from Code | v1 | How do I modify this code so that only the parent can call fork()? | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-03-03T20:32:19.497Z | Explain Code | v1 | null | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int pid;
int n;
for (int i = 0; i < iterations; i++) {
// if (i = 0) {
// int n = fork();
// if (n != 0) {
// pid = getppid();
// }
// }
if (n != 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-03-03T20:44:16.913Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int pid;
int n;
for (int i = 0; i < iterations; i++) {
if (n != 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
| the new children do not create additional processes. Only the original parent calls fork. But currently, I get one extra fork | null |
63c647a35f004bf4898cf568 | 2023-03-03T20:50:46.768Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int pid;
int n;
for (int i = 0; i < iterations; i++) {
if (n != 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
}
| I want to make sure only the original parent calls fork. | null |
63c647a35f004bf4898cf568 | 2023-03-03T21:24:36.724Z | Question from Code | v1 | I want to make it such that only child calls fork(). | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
for (int i = 0; i < iterations; i++) {
int n = fork();
if (n == 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c647a35f004bf4898cf568 | 2023-03-03T21:30:11.166Z | Help Fix Code | v1 | null | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int n;
fork();
for (int i = 0; i < iterations; i++) {
if (n == 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | I would like to make sure only child calls fork() but now it only calls it once and terminates when i = 2. So I only get one process from the child instead of 2. | null |
63c647a35f004bf4898cf568 | 2023-03-03T21:31:50.085Z | Question from Code | v1 | I would like to make sure only child calls fork() but now it only calls it once and terminates when i = 2. So I only get one process from the child instead of 2. | int main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "Usage: forkloop <iterations>\n");
exit(1);
}
int iterations = strtol(argv[1], NULL, 10);
int n;
fork();
for (int i = 0; i < iterations; i++) {
if (n == 0) {
n = fork();
}
if (n < 0) {
perror("fork");
exit(1);
}
printf("ppid = %d, pid = %d, i = %d\n", getppid(), getpid(), i);
}
return 0;
} | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T01:58:50.180Z | Question from Code | v1 | what is the vaue of ptr | char *ptr; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T01:59:42.411Z | Question from Code | v1 | what is the value of s | char s; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:00:39.520Z | General Question | v1 | logical or in c | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:18:53.144Z | General Question | v1 | how to initialize a empty string?
| null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:20:16.416Z | Question from Code | v1 | what is the value of s | char s[3] =""; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:51:48.170Z | General Question | v1 | logical not in c | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:52:27.507Z | General Question | v1 | what is not in C | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:53:31.899Z | Explain Code | v1 | null | bool t = not false; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T02:55:03.239Z | General Question | v1 | is operator not different than logical operator ! | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:04:54.012Z | General Question | v1 | how to declare a boolean type variable
| null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:07:55.139Z | General Question | v1 | value of false | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:08:12.748Z | General Question | v1 | what type is false | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:09:33.059Z | Explain Code | v1 | null | 0 and 0 == false; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:10:53.292Z | Explain Code | v1 | null | 0 || 1 == true; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:11:38.902Z | General Question | v1 | format specifier for boolean type | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T03:58:12.307Z | General Question | v1 | what is being compared when use == to compare two pointers | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T18:30:02.047Z | General Question | v1 | what are switch stateemnts | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T18:57:42.381Z | General Question | v1 | what does fclose return | null | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T19:20:13.002Z | Question from Code | v1 | how to initialize user.profile_pic to an empty array | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME];
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User; | null | null |
63c647a55f004bf4898cf57c | 2023-02-15T19:22:02.579Z | Explain Code | v1 | null | typedef struct user {
char name[MAX_NAME];
char profile_pic[MAX_NAME];
struct post *first_post;
struct user *friends[MAX_FRIENDS];
struct user *next;
} User;
User user1;
char user1.profile_pic[20]; | null | null |