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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #pragma weak _cfsetispeed = cfsetispeed
     33 
     34 #include "lint.h"
     35 #include <sys/types.h>
     36 #include <sys/termios.h>
     37 
     38 /*
     39  * sets the input baud rate stored in c_cflag to speed
     40  */
     41 
     42 int
     43 cfsetispeed(struct termios *termios_p, speed_t speed)
     44 {
     45 	/*
     46 	 * If the input speed is zero, set it to output speed
     47 	 */
     48 	if (speed == 0) {
     49 		speed = termios_p->c_cflag & CBAUD;
     50 		if (termios_p->c_cflag & CBAUDEXT)
     51 			speed += (CBAUD + 1);
     52 	}
     53 
     54 	if ((speed << 16) > CIBAUD) {
     55 		termios_p->c_cflag |= CIBAUDEXT;
     56 		speed -= ((CIBAUD >> 16) + 1);
     57 	} else
     58 		termios_p->c_cflag &= ~CIBAUDEXT;
     59 	termios_p->c_cflag =
     60 	    (termios_p->c_cflag & ~CIBAUD) | ((speed << 16) & CIBAUD);
     61 	return (0);
     62 }
     63