int close(const char *from, const char *to, void *aux)
{
stack_t *stk = aux;
int val;
val = stack_top(stk).val;
stack_drop(stk);
calc_op(stk,val);
printf(")");
return 0;
}
static bool daemon_serve(int s, char *cmd) {
/* Do <cmd> for client connected on <s>. */
static Node *null=NULL, **stack=&null;
char buf[FILEPATH_MAX];
bool keep_running=true;
if( strcmp(cmd, CMD_PUSH) == 0 ) {
char *status;
if( stack_len(stack) >= STACK_MAX ) {
printf("daemon: push request failed (stack full)\n");
status = MSG_ERROR;
strcpy(buf, MSG_ERR_STACK_FULL);
} else {
soc_w(s, MSG_SUCCESS);
if( soc_r(s, buf, FILEPATH_MAX) <= 0 ) {
printf("daemon: push request failed (read error)\n");
status = MSG_ERROR;
strcpy(buf, MSG_ERR_LENGTH);
} else {
status = MSG_SUCCESS;
stack_push(buf, stack);
printf("daemon: PUSH `%s'\n", buf);
}
}
soc_w(s, status);
soc_w(s, buf);
} else if( strcmp(cmd, CMD_POP) == 0 ) {
char *status;
if( stack_len(stack) > 0 ) {
status = MSG_SUCCESS;
sprintf(buf, "%s", stack_peek(stack));
stack_drop(stack);
printf("daemon: POP `%s'\n", buf);
} else {
printf("daemon: tried to pop from empty stack\n");
status = MSG_ERROR;
sprintf(buf, MSG_ERR_STACK_EMPTY);
}
soc_w(s, status);
soc_w(s, buf);
} else if( strcmp(cmd, CMD_PEEK) == 0 ) {
char *status;
if( stack_len(stack) > 0 ) {
status = MSG_SUCCESS;
sprintf(buf, "%s", stack_peek(stack));
} else {
status = MSG_ERROR;
sprintf(buf, MSG_ERR_STACK_EMPTY);
}
soc_w(s, status);
soc_w(s, buf);
} else if( strcmp(cmd, CMD_PICK) == 0 ) {
char *picked;
soc_w(s, MSG_SUCCESS);
soc_r(s, buf, MSG_MAX);
picked = stack_nth(atoi(buf), stack);
if( picked == NULL ) {
soc_w(s, MSG_ERROR);
soc_w(s, "stack is not quite that deep");
} else {
soc_w(s, MSG_SUCCESS);
soc_w(s, picked);
}
} else if( strcmp(cmd, CMD_SIZE) == 0 ) {
sprintf(buf, "%d", stack_len(stack));
soc_w(s, buf);
} else if( strcmp(cmd, CMD_STOP) == 0 ) {
printf("daemon: Shutting down...\n");
soc_w(s, MSG_SUCCESS);
keep_running = false;
} else {
char msg[MSG_MAX + FILEPATH_MAX];
sprintf(msg, "unknown command `%s'", cmd);
soc_w(s, msg);
}
return keep_running;
}
