switch to POSIX tty, old code still supported under OLD_TTY

[unix-history] / usr / src / usr.bin / window / wwpty.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)wwpty.c     3.19 (Berkeley) %G%";
#endif /* not lint */

#include "ww.h"
#if !defined(OLD_TTY) && !defined(TIOCPKT)
#include <sys/ioctl.h>
#endif

wwgetpty(w)
register struct ww *w;
{
       register char c, *p;
       int tty;
       int on = 1;
#define PTY "/dev/XtyXX"
#define _PT     5
#define _PQRS   8
#define _0_9    9

       (void) strcpy(w->ww_ttyname, PTY);
       for (c = 'p'; c <= 'u'; c++) {
               w->ww_ttyname[_PT] = 'p';
               w->ww_ttyname[_PQRS] = c;
               w->ww_ttyname[_0_9] = '0';
               if (access(w->ww_ttyname, 0) < 0)
                       break;
               for (p = "0123456789abcdef"; *p; p++) {
                       w->ww_ttyname[_PT] = 'p';
                       w->ww_ttyname[_0_9] = *p;
                       if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
                               continue;
                       w->ww_ttyname[_PT] = 't';
                       if ((tty = open(w->ww_ttyname, 2)) < 0) {
                               (void) close(w->ww_pty);
                               continue;
                       }
                       (void) close(tty);
                       if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
                               (void) close(w->ww_pty);
                               continue;
                       }
                       return 0;
               }
       }
       w->ww_pty = -1;
       wwerrno = WWE_NOPTY;
       return -1;
}