static void do_something()
{
char *q;
if ((q = memnewline(buf, bytes_in_buf))) {
do_something_server(q);
} else {
fd_set fdlist;
FD_ZERO(&fdlist);
FD_SET(0, &fdlist);
FD_SET(serverfd, &fdlist);
if (select(serverfd+1, &fdlist, NULL, NULL, NULL) < 0) {
perror("select");
} else {
if (FD_ISSET(serverfd, &fdlist)) {
int n = read(serverfd, buf+bytes_in_buf, sizeof buf - bytes_in_buf);
if (n == 0) {
printf("\nserver dropped the connection\n");
exit(0);
} else if (n < 0) {
perror("read");
exit(1);
} else {
bytes_in_buf += n;
if ((q = memnewline(buf, bytes_in_buf)))
do_something_server(q);
}
}
if (FD_ISSET(0, &fdlist)) {
char buf[80];
if (fgets(buf, sizeof buf, stdin) == NULL)
exit(0);
//step 3
char buf1[80];
int l = strlen(lang_say);
strncpy(buf1,buf,l);
buf1[l]= 0;
if (strcmp (buf1,lang_say) == 0){
strncpy(buf1, buf + l + 1, strlen(buf) - l);
sprintf(buf,"say %s\n",buf1);
send_string(buf);
}else{
docmd(explode(buf));
}
}
}
}
}
static void connect_to_server()
{
struct hostent *hp;
struct sockaddr_in r;
char *q;
int len, server_protocol, server_nplaces, server_nthings;
if ((hp = gethostbyname(host)) == NULL) {
fprintf(stderr, "%s: no such host\n", host);
exit(1);
}
if (hp->h_addr_list[0] == NULL || hp->h_addrtype != AF_INET) {
fprintf(stderr, "%s: not an internet protocol host name\n", host);
exit(1);
}
if ((serverfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket");
exit(1);
}
memset((char *)&r, '\0', sizeof r);
r.sin_family = AF_INET;
memcpy((char *)&r.sin_addr, hp->h_addr_list[0], hp->h_length);
r.sin_port = htons(port);
if (connect(serverfd, (struct sockaddr *)&r, sizeof r) < 0) {
perror("connect");
exit(1);
}
/* read banner line */
while (!(q = memnewline(buf, bytes_in_buf))) {
if ((len = read(serverfd, buf+bytes_in_buf, sizeof buf - bytes_in_buf))
== 0) {
printf("server dropped the connection\n");
exit(0);
} else if (len < 0) {
perror("read");
exit(1);
}
bytes_in_buf += len;
}
*q = '\0';
if (sscanf(buf, "%d%d%d",
&server_protocol, &server_nplaces, &server_nthings)
!= 3) {
fprintf(stderr, "can't parse server banner line\n");
exit(0);
}
if (server_protocol != PROTOCOL_VERSION) {
fprintf(stderr, "protocol version mismatch\n");
exit(0);
}
if (server_nplaces != nplaces || server_nthings != lang_nthings) {
fprintf(stderr, "server has a different map than we do\n");
exit(0);
}
/* remove the banner line from the already-read buffer */
len = q - buf + 1;
if (bytes_in_buf > len && (buf[len] == '\r' || buf[len] == '\n'))
len++;
bytes_in_buf -= len;
memmove(buf, buf + len, bytes_in_buf);
}
/* This function is guaranteed to do at most one read(). */
char *read_line_from_server(struct server *s)
{
int len;
char *p;
/*
* If we returned a line last time, that's at the beginning of buf --
* move the rest of the string over it. The bytes_in_buf value has
* already been adjusted.
*/
if (s->nextbuf) {
memmove(s->buf, s->nextbuf, s->bytes_in_buf);
s->nextbuf = NULL;
}
/* Do a read(), unless we already have a whole line. */
if (!memnewline(s->buf, s->bytes_in_buf)) {
if ((len = read(s->serfd, s->buf + s->bytes_in_buf,
sizeof s->buf - s->bytes_in_buf - 1)) < 0) {
perror("read");
exit(1);
}
if (len == 0) {
printf("Server shut down.\n");
exit(0);
}
s->bytes_in_buf += len;
}
/* Now do we have a whole line? */
if ((p = memnewline(s->buf, s->bytes_in_buf))) {
s->nextbuf = p + 1; /* the next line if the newline is one byte */
/* but if the newline is \r\n... */
if (s->nextbuf < s->buf + s->bytes_in_buf && *p == '\r' && *(p+1) == '\n')
s->nextbuf++; /* then skip the \n too */
/*
* adjust bytes_in_buf for next time. Data moved down at the
* beginning of the next read_line_from_server() call.
*/
s->bytes_in_buf -= s->nextbuf - s->buf;
*p = '\0'; /* we return a nice string */
/* Is there a subsequent line already waiting? */
s->lines_pending = !!memnewline(s->nextbuf, s->bytes_in_buf);
return(s->buf);
}
/*
* Is the buffer full even though we don't yet have a whole line?
* This shouldn't happen if the server is following the protocol, but
* still we don't want to infinite-loop over this.
*/
if (s->bytes_in_buf == sizeof s->buf - 1) {
s->buf[sizeof s->buf - 1] = '\0';
s->bytes_in_buf = 0;
s->lines_pending = 0;
return(s->buf); /* needn't set nextbuf because there's nothing to move */
}
/* No line yet. Please try again later. */
return(NULL);
}
