2.9BSD/usr/src/lib/libU77/ttynam_.c

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/*
char id_ttynam[] = "@(#)ttynam_.c	1.1";
 *
 * Return name of tty port associated with lunit
 *
 * calling sequence:
 *	character*19 string, ttynam
 * 	string = ttynam (lunit)
 * where:
 *	the character string will be filled with the name of
 *	the port, preceded with '/dev/', and blank padded.
 *	(19 is the max length ever required)
 */

#include	"../libI77/fiodefs.h"

extern unit units[];

ttynam_(name, strlen, lu)
char *name; ftnlen strlen; ftnint *lu;
{
	char *t = NULL, *ttyname();

	if (0 <= *lu && *lu < MXUNIT && units[*lu].ufd)
		t = ttyname(fileno(units[*lu].ufd));
	if (t == NULL)
		t = "";
	b_char(t, name, strlen);
}