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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_08_12
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8n12122a
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1990-10-29
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84 lines
/**** LISTING 3 *******/
main()
{
int get_event();
ARG arg;
init(&arg);
/* the event loop */
while (1)
{
driver(get_event(), &arg);
}
}
/* Initialize the ARG structure */
int init(arg)
ARG *arg;
{
arg->cur_state = 1;
arg->chan = 1;
}
/* Get an event - here it is from stdio */
int get_event()
{
int ev;
printf("Event: ");
if (scanf("%d", &ev) != 1)
{
printf("\nCompleted\n");
exit(0);
}
return (ev);
}
/* send the event through the state machine */
int driver(ev, arg)
int ev;
ARG *arg;
{
register int curr = arg->cur_state;
register int i,j;
int (*func) ();
/* find the state */
for (i = 0; (curr != s_table[i].state || s_table[i].state == END); i++);
if (s_table[i].state == END)
{
printf("Invalid State: %d\n",curr);
return (-1);
}
/* find the event for this state */
for (; (s_table[i].event != ev && s_table[i].state == curr); i++);
if (s_table[i].state != curr)
{
/* uncomment printf if warning desired */
/* printf("Invalid event: %d\n", ev); */
return (-2);
}
/* set the next state */
arg->cur_state = s_table[i].n_state;
/* execute the function list */
for (j = 0; j < MAX_FUNCS; j++)
{
if ((func = *(s_table[i].flist[j])) != 0)
(*func) (arg);
}
return (0);
}