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/************************************************************************
Functions for reading and writing "messages" over virtual circuits for
the tic-tac-toe system.
Phil Kearns
April 12, 1998
*************************************************************************/
#include "common.h"
void
putmsg(int s, struct tttmsg *m)
// int s socket on which sending
// struct tttmsg *m pointer to the message to be sent
{
int bytes_sofar, to_go, num;
char *addr;
bytes_sofar = 0;
to_go = sizeof(struct tttmsg);
addr = (char *) m;
while (to_go > 0) {
num = write(s, &(addr[bytes_sofar]), to_go);
if (num < 0) {
perror("putmsg");
exit(1);
}
to_go -= num; bytes_sofar += num;
}
}
void
getmsg(int s, struct tttmsg *m)
// int s socket on which receiving
// struct tttmsg *m container for the message
{
int bytes_sofar, to_go, num;
char *addr;
bytes_sofar = 0;
to_go = sizeof(struct tttmsg);
addr = (char *) m;
while (to_go > 0) {
num = read(s, &(addr[bytes_sofar]), to_go);
if (num < 0) {
perror("putmsg");
exit(1);
}
if (num == 0) {
fprintf(stderr, "Unexpected EOF\n");
exit(1);
}
to_go -= num; bytes_sofar += num;
}
}
void
protocol_error(char expected, struct tttmsg *offender)
{
char *stype;
fprintf(stderr, "Protocol error: expected ");
switch (expected) {
case 'A':
stype = "WHO"; break;
case 'B':
stype = "HANDLE"; break;
case 'C':
stype = "MATCH"; break;
case 'D':
stype = "WHATMOVE"; break;
case 'E':
stype = "MOVE"; break;
case 'F':
stype = "RESULT"; break;
default:
stype = "UNKNOWN"; break;
}
fprintf(stderr, "%s message; got following message:\n", stype);
dumpmsg(offender);
exit(1);
}
void
dumpmsg(struct tttmsg *m)
{
char *stype, datastring[32];
int i;
switch (m->type) {
case 'A':
stype = "WHO"; break;
case 'B':
stype = "HANDLE"; break;
case 'C':
stype = "MATCH"; break;
case 'D':
stype = "WHATMOVE"; break;
case 'E':
stype = "MOVE"; break;
case 'F':
stype = "RESULT"; break;
default:
stype = "UNKNOWN"; break;
}
fprintf(stderr,"\tTYPE: %s\n",stype);
fprintf(stderr,"\tBOARD: [");
for (i=0; i<8; i++)
fprintf(stderr,"%c,",m->board[i]);
fprintf(stderr,"%c]\n",m->board[8]);
bcopy(datastring,&(m->data),31);
datastring[31]='\0';
fprintf(stderr,"\tDATA: %s\n", datastring);
fprintf(stderr,"\tRES: %c\n", m->res);
}
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