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client.c
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client.c
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#include "client.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#define BUF_MAX 1024
void connector_new(connector *self) {
memset(self, 0, sizeof(connector));
}
void connector_destructor(connector *self) {
if (self->destructor != NULL && self->p != NULL) {
self->destructor(self->p);
}
}
// Contains protocol-agnostic logic of `client`.
// e.g. Input serialization, server response parsing, error handling.
typedef struct client_impl_t {
char buf[BUF_MAX]; // buffer for serialization
} client_impl;
// Creates a new `client_impl`.
// Returns 0 on success, -1 on failure.
int client_impl_new(client_impl *self) {
memset(self->buf, 0, BUF_MAX);
return 0;
}
void client_impl_destructor(__attribute__((unused)) client_impl *self) {
// do nothing
}
int client_impl_initial_prompt(client_impl *self) {
memset(self->buf, 0, BUF_MAX);
printf(">>>Ready to start game? (y/n): ");
scanf("%s", self->buf);
self->buf[strcspn(self->buf, "\n")] = 0;
const char *y_str = "y";
if (strcmp(self->buf, y_str) != 0) {
return 1;
}
return 0;
}
char client_impl_scan_guess(client_impl *self) {
while (1) {
memset(self->buf, 0, BUF_MAX);
printf(">>>Letter to guess: ");
scanf("%s", self->buf);
self->buf[strcspn(self->buf, "\n")] = 0;
if (strlen(self->buf) < 1) { // Ctrl+D!!
return -1;
}
if (strlen(self->buf) == 1) {
if (self->buf[0] >= 'A' && self->buf[0] <= 'Z') {
break;
}
if (self->buf[0] >= 'a' && self->buf[0] <= 'z') {
break;
}
}
// two letters
printf(">>>Error! Please guess one letter.\n");
}
return self->buf[0];
}
client *client_new(connector c) {
client_impl *p = malloc(sizeof(client_impl));
if (p == NULL) return NULL;
client_impl_new(p);
client *self = malloc(sizeof(client));
if (self == NULL) {
free(p);
return NULL;
}
self->c = c;
self->p = p;
return self;
}
void client_destructor(client *self) {
connector_destructor(&self->c);
if (self->p == NULL) return;
client_impl_destructor(self->p);
free(self->p);
self->p = NULL;
}
typedef struct control_msg_t {
const char *word;
char word_len;
const char *wrong_guesses;
char wrong_guesses_len;
} control_msg;
control_msg *client_recv_control_msg(client *self) {
char word_len;
{
const char *msg = self->c.recv_func(self->c.p, 1); // word len
if (msg == NULL) {
printf("recv word len failed");
return NULL;
}
word_len = msg[0];
}
char wrong_guesses_len;
{
const char *msg = self->c.recv_func(self->c.p, 1); // wrong guesses
if (msg == NULL) {
printf("recv wrong guesses failed");
return NULL;
}
wrong_guesses_len = msg[0];
}
char *word = malloc(word_len + 1);
{
const char *msg = self->c.recv_func(self->c.p, word_len); // word
if (msg == NULL) {
printf("recv word failed");
return NULL;
}
strcpy(word, msg);
word[word_len] = 0;
}
char *wrong_guesses_str = NULL;
if (wrong_guesses_len > 0) {
wrong_guesses_str = malloc(wrong_guesses_len + 1);
{
const char *msg = self->c.recv_func(self->c.p, wrong_guesses_len); // wrong guesses
if (msg == NULL) {
printf("recv wrong guesses failed");
return NULL;
}
strcpy(wrong_guesses_str, msg);
wrong_guesses_str[wrong_guesses_len] = 0;
}
}
control_msg *res = malloc(sizeof(control_msg));
if (res == NULL) {
printf("malloc failed");
return NULL;
}
res->word = word;
res->word_len = word_len;
res->wrong_guesses = wrong_guesses_str;
res->wrong_guesses_len = wrong_guesses_len;
return res;
}
typedef struct server_msg_t {
char msg_flag;
union {
control_msg *control;
char *announcement;
} msg;
} server_msg;
int client_recv_msg(client *self, server_msg *ret) {
char msg_flag;
{
const char *msg = self->c.recv_func(self->c.p, 1); // msg flag
if (msg == NULL) {
printf("recv msg flag failed");
return -1;
}
msg_flag = msg[0];
}
ret->msg_flag = msg_flag;
if (msg_flag < 1) { // control msg
control_msg *msg = client_recv_control_msg(self);
if (!msg) return -1;
ret->msg.control = msg;
return 0;
}
char *announcement_str = NULL;
{
announcement_str = malloc(msg_flag + 1);
const char *msg = self->c.recv_func(self->c.p, msg_flag); // announcement
if (msg == NULL) {
printf("recv announcement failed");
return -1;
}
strcpy(announcement_str, msg);
announcement_str[msg_flag] = 0;
}
ret->msg.announcement = announcement_str;
return 0;
}
int client_send_msg(client *self, const char *msg, char msg_len) {
if (self->c.send_func(self->c.p, &msg_len, 1)) return -1;
if (msg_len > 0) {
if (self->c.send_func(self->c.p, msg, msg_len)) return -1;
}
return 0;
}
void client_run(client *self) {
{
server_msg serv;
client_recv_msg(self, &serv);
if (serv.msg_flag > 0) {
if (strcmp(serv.msg.announcement, "server-overloaded") == 0) {
printf(">>>%s\n", serv.msg.announcement);
return; // overloaded
}
}
}
if (client_impl_initial_prompt(self->p)) {
printf("Exiting...\n");
return;
}
if (client_send_msg(self, NULL, 0)) {
printf("send initial msg failed");
return;
}
// printf("initialized, awaiting server...\n");
while (1) {
server_msg serv;
client_recv_msg(self, &serv);
if (serv.msg_flag > 0) {
printf(">>>%s\n", serv.msg.announcement);
if (strcmp(serv.msg.announcement, "server-overloaded") == 0) {
return; // overloaded
}
if (strcmp(serv.msg.announcement, "Game Over!") == 0) {
return; // completed
}
continue;
}
if(strchr(serv.msg.control->word, '_') == NULL) { // got correct word
printf(">>>The word was %s\n", serv.msg.control->word);
continue;
}
{
printf(">>>");
for (int i = 0; i < serv.msg.control->word_len; i += 1) {
printf("%c", serv.msg.control->word[i]);
if (i < serv.msg.control->word_len - 1) {
printf(" ");
}
}
printf("\n");
}
if (serv.msg.control->wrong_guesses_len < 1) {
printf(">>>Incorrect Guesses: \n");
} else {
printf(">>>Incorrect Guesses: ");
for (int i = 0; i < serv.msg.control->wrong_guesses_len; i += 1) {
printf("%c", serv.msg.control->wrong_guesses[i]);
if (i < serv.msg.control->wrong_guesses_len - 1) {
printf(" ");
}
}
printf("\n");
}
printf(">>>\n");
char guess = client_impl_scan_guess(self->p);
if (guess == -1) { // Ctrl+D
client_send_msg(self, NULL, 0);
printf("\n");
return;
}
if (client_send_msg(self, &guess, 1)) {
printf("send guess msg failed");
return;
}
}
}