4.3BSD - /usr/src/usr.lib/libU77/ttynam_.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)ttynam_.c	5.1	6/7/85
   7:  */
   8: 
   9: /*
  10:  * Return name of tty port associated with lunit
  11:  *
  12:  * calling sequence:
  13:  *	character*19 string, ttynam
  14:  * 	string = ttynam (lunit)
  15:  * where:
  16:  *	the character string will be filled with the name of
  17:  *	the port, preceded with '/dev/', and blank padded.
  18:  *	(19 is the max length ever required)
  19:  */
  20: 
  21: #include "../libI77/fiodefs.h"
  22: 
  23: extern unit units[];
  24: 
  25: ttynam_(name, strlen, lu)
  26: char *name; long strlen; long *lu;
  27: {
  28:     char *t = NULL, *ttyname();
  29: 
  30:     if (0 <= *lu && *lu < MXUNIT && units[*lu].ufd)
  31:         t = ttyname(fileno(units[*lu].ufd));
  32:     if (t == NULL)
  33:         t = "";
  34:     b_char(t, name, strlen);
  35: }

Defined functions