error reporting

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

#ifndef lint
static  char *sccsid = "@(#)wwpty.c     3.3 83/08/26";
#endif

#include "ww.h"

wwgetpty(w)
       register struct ww *w;
{
       register char c;
       register char *line;
       register int i;
#define PTY "/dev/ptyXX"

       for (c = 'p'; c <= 's'; c++) {
               line = PTY;
               line[sizeof PTY - 6] = 'p';
               line[sizeof PTY - 3] = c;
               line[sizeof PTY - 2] = '0';
               if (access(line, 0) < 0)
                       break;
               for (i = 0; i < 16; i++) {
                       line[sizeof PTY - 6] = 'p';
                       line[sizeof PTY - 2] = "0123456789abcdef"[i];
                       w->ww_pty = open(line, 2);
                       if (w->ww_pty >= 0) {
                               line[sizeof PTY - 6] = 't';
                               w->ww_tty = open(line, 2);
                               if (w->ww_tty >= 0)
                                       goto good;
                               (void) close(w->ww_pty);
                       }
               }
       }
       wwerrno = WWE_NOPTY;
       return -1;
good:
       (void) strcpy(w->ww_ttyname, line);
       return 0;
}