ref: 0c01f247e31b2cc808392f32ae00691dedad9796
dir: /srv.c/
/*
* glendy (unix) server, based on cli version.
*
* it appears to my mind that socket.h and stdio.h have are in use
* since medieval times, which is really impressive of a design;
* ...for a torture device.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "unix.h"
#include "engine.h"
#define playersock sockfd[turn % 2]
int pcount = 0;
int sockfd[2];
int debug = 1;
char syncmsg[8];
pthread_mutex_t pcount_mutex;
// pthread_mutex_t print_mutex;
/*
* it might feel odd why it starts from 10,
* becase then we can just read two bytes to see what's wrong.
*/
enum
{
GLNDY_CONN = 10,
GLNDY_INIT = 11,
GLNDY_SYNC,
GLNDY_OK,
GLNDY_WAIT,
GLNDY_TURN,
GLNDY_NOTTURN,
GLNDY_CANTM,
GLNDY_CANTP,
GLNDY_INVALIDINPUT,
GLNDY_WALL,
GLNDY_GWON,
GLNDY_GLOST,
};
static void
error(const char *msg)
{
perror(msg);
pthread_exit(NULL);
}
static void
vprint(int fd, char *fmt, va_list arg)
{
char *s = malloc(1024);
int n;
n = vsprintf(s, fmt, arg);
if(write(fd, s, n) < n)
error("couldn't write\n");
free(s);
}
static void
print(int fd, char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
vprint(fd, fmt, arg);
va_end(arg);
}
static void
printclients(char *fmt, ...)
{
/* it seems arg gets changed during the first call to vprint, thus we need two */
va_list arg, arg2;
va_start(arg, fmt);
va_start(arg2, fmt);
vprint(sockfd[0], fmt, arg);
vprint(sockfd[1], fmt, arg2);
va_end(arg);
va_end(arg2);
}
static int
dprint(char *fmt, ...)
{
va_list va;
int n;
if(!debug)
return 0;
va_start(va, fmt);
n = vfprintf(stderr, fmt, va);
va_end(va);
return n;
}
int
setuplistener(int portno)
{
int sockfd;
struct sockaddr_in serv_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening listener socket.");
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR binding listener socket.");
dprint("listener on\n");
return sockfd;
}
void
getclients(int lis_sockfd)
{
int conns = 0;
socklen_t clilen;
struct sockaddr_in servaddr, clientaddr;
while(conns < 2)
{
listen(lis_sockfd, 253 - pcount);
memset(&clientaddr, 0, sizeof(clientaddr));
clilen = sizeof(clientaddr);
sockfd[conns] = accept(lis_sockfd, (struct sockaddr *) &clientaddr, &clilen);
if(sockfd[conns] < 0)
error("ERROR accepting a connection from a client.");
dprint("got connection %d\n", conns);
print(sockfd[conns], "CONN %d\n", conns);
dprint("client %d connected\n", conns);
pthread_mutex_lock(&pcount_mutex);
pcount++;
dprint("pcount = %d\n", pcount);
pthread_mutex_unlock(&pcount_mutex);
if(conns == 0)
{
print(sockfd[conns], "WAIT\n");
dprint("someone is gonna wait until they friend comes\n");
}
conns++;
}
}
void
drawlevel(void)
{
/* prints first row, this assumes SzX = SzY, is there a better way? */
printf("T%2d|", turn);
for(int i = 0 ; i < SzX ; i++)
printf("%2d |", i);
printf("\n");
for(int x = 0; x < SzX; x++)
{
for(int i = 0 ; i < SzY+1 ; i++)
printf("----");
printf("\n");
/* show column number and have a zig-zag effect */
printf("%2d%s |", x, x % 2 ? "" : "| ");
for(int y = 0; y < SzY; y++)
{
/* it's [y][x], not [x][y] */
switch(grid[y][x])
{
case Wall:
printf(" * |");
break;
case Glenda:
/* fancy effect for glenda's face */
printf(" g |");
break;
default:
printf(" |");
break;
}
}
printf("\n");
}
}
void
sendlevel(void)
{
if(state == Start)
{
printclients("INIT\n");
for(int x = 0; x < SzX; x++)
{
for(int y = 0; y < SzY; y++)
{
/* it's [y][x], not [x][y] */
switch(grid[y][x])
{
case Wall:
printclients("w %d %d\n", x, y);
break;
case Glenda:
printclients("g %d %d\n", x, y);
break;
}
}
}
printclients("SENT\n");
}
else if(state == Playing)
{
dprint("turn: %d\n", turn);
printclients("SYNC %d %s\n", turn, syncmsg);
}
else
{
if(state == Won)
printclients("WON\n");
else if(state == Lost)
printclients("LOST\n");
restart(); /* will it execute twice? */
}
}
/* p x y */
void
proc_put(char *s)
{
unsigned int x, y, r;
sscanf(s, "%u %n", &x, &r);
sscanf(s+r, "%u", &y);
dprint("put %d %d\n", x, y);
if(x >= SzX || x < 0 || y >= SzY || y < 0)
{
print(playersock, "ERR invalidinput proc_put(): %d %d\n", x, y);
return;
}
r = doput(Pt(x, y));
if(r == Wall)
print(playersock, "WALL %d %d\n", x, y);
else
{
strncpy(syncmsg, s, 8);
dprint("syncmsg = %s\n", s);
}
}
/* m x y */
void
proc_move(char *s)
{
int d;
Point p;
p = findglenda();
if(strcmp(s, "NE") == 0)
d = NE;
else if(strcmp(s, "E") == 0)
d = E;
else if(strcmp(s, "SE") == 0)
d = SE;
else if(strcmp(s, "W") == 0)
d = W;
else if(strcmp(s, "SW") == 0)
d = SW;
else if(strcmp(s, "NW") == 0)
d = NW;
else
{
print(playersock, "ERR invalidinput proc_move(): %s\n", s);
return;
}
if(domove(d, p) == Wall)
{
print(playersock, "WALL %s %d %d\n", s, p.x, p.y);
return;
}
else
{
strncpy(syncmsg, s, 8);
dprint("syncmsg = %s\n", syncmsg);
}
}
/*
* handle input, which is in the form of
* p1> p xx yy
* which puts a wall in xx yy
* p2> m {NE, E, SE, W, SW, NW}
* which moves the bunny
* > r
* restarts the game
* > u
* undos last move
* > q
* quits the game
*/
void
proc(char *s)
{
char *t;
int oturn, n;
/* skip \n, so we don't need to process it later */
t = strchr(s, '\n');
if(t != nil)
*t = '\0';
oturn = turn;
/* s+2 skips command and first space after it */
switch(*s)
{
case 'p':
if(turn % 2 == 0)
proc_put(s+2);
else if(turn % 2 == 1)
print(playersock, "CANTP\n");
break;
case 'm':
if(turn % 2 == 0)
print(playersock, "CANTM\n");
else if(turn % 2 == 1)
proc_move(s+2);
break;
case 'u':
undo();
break;
case 'r':
/* maybe we need to put a confirm message here */
restart();
break;
case 'q':
case '\0':
/* should we end the game at this point? XXX important */
break;
default:
print(playersock, "ERR invalidinput %c\n", *s);
}
/* only print the map if turn have changed */
if(turn != oturn)
{
if(debug)
drawlevel();
sendlevel();
}
}
int
input(void)
{ char *s, c;
int n = 0;
/* sang bozorg */
s = malloc(1024);
print(playersock, "TURN\n");
// while((c = read(playersock, s + n++, 1)) != '\n' && c != '\0' && n < 1023)
memset(s, 0, 1024);
while(read(playersock, s+n, 1) == 1 && n < 1024)
{
if(s[n] == '\n' || s[n] == '\0')
{
s[n] = '\0';
break;
}
n++;
}
dprint("got input: %s\n", s);
proc(s);
return Ok;
}
int
main(int argc, char **argv)
{
int listenfd, port, result;
char r;
// pthread_t thread;
/* it might not be a real human */
ptype[0] = Human;
ptype[1] = Human;
if(argc != 2)
{
fprintf(stderr, "usage: %s <port>\n", argv[0]);
exit(1);
}
port = atoi(argv[1]);
listenfd = setuplistener(port);
pthread_mutex_init(&pcount_mutex, NULL);
// pthread_mutex_init(&print_mutex, NULL);
/* OpenBSD ignores this */
srand(time(nil));
getclients(listenfd);
initlevel();
/* result = pthread_create(&thread, NULL, (void*)input, NULL);
// if(result){
// printf("Thread creation failed with return code %d\n", result);
// exit(-1);
// }
*/
if(debug)
drawlevel();
sendlevel();
while(input() != Err)
;
close(listenfd);
// pthread_mutex_destroy(&pcount_mutex);
// pthread_mutex_destroy(&print_mutex);
return 0;
}