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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1997 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 /*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40 /*LINTLIBRARY*/
41
42 /*
43 * Routines to deal with setting and resetting modes in the tty driver.
44 * See also setupterm.c in the termlib part.
45 */
46 #include <sys/types.h>
47 #include "curses_inc.h"
48
49 int
cbreak(void)50 cbreak(void)
51 {
52 /*
53 * This optimization is here because till SVR3.1 curses did not come up
54 * in cbreak mode and now it does. Therefore, most programs when they
55 * call cbreak won't pay for it since we'll know we're in the right
56 * mode.
57 */
58
59 if (cur_term->_fl_rawmode != 1) {
60 #ifdef SYSV
61 /*
62 * You might ask why ICRNL has anything to do with cbreak.
63 * The problem is that there are function keys that send
64 * a carriage return (some hp's). Curses cannot virtualize
65 * these function keys if CR is being mapped to a NL. Sooo,
66 * when we start a program up we unmap those but if you are
67 * in nocbreak then we map them back. The reason for that is that
68 * if a getch or getstr is done and you are in nocbreak the tty
69 * driver won't return until it sees a new line and since we've
70 * turned it off any program that has nl() and nocbreak() would
71 * force the user to type a NL. The problem with the function keys
72 * only gets solved if you are in cbreak mode which is OK
73 * since program taking action on a function key is probably
74 * in cbreak because who would expect someone to press a function
75 * key and then return ?????
76 */
77
78 PROGTTYS.c_iflag &= ~ICRNL;
79 PROGTTYS.c_lflag &= ~ICANON;
80 PROGTTYS.c_cc[VMIN] = 1;
81 PROGTTYS.c_cc[VTIME] = 0;
82 #else
83 PROGTTY.sg_flags |= (CBREAK | CRMOD);
84 #endif
85
86 #ifdef DEBUG
87 #ifdef SYSV
88 if (outf)
89 fprintf(outf, "cbreak(), file %x, flags %x\n",
90 cur_term->Filedes, PROGTTYS.c_lflag);
91 #else
92 if (outf)
93 fprintf(outf, "cbreak(), file %x, flags %x\n",
94 cur_term->Filedes, PROGTTY.sg_flags);
95 #endif
96 #endif
97 cur_term->_fl_rawmode = 1;
98 cur_term->_delay = -1;
99 (void) reset_prog_mode();
100 #ifdef FIONREAD
101 cur_term->timeout = 0;
102 #endif /* FIONREAD */
103 }
104 return (OK);
105 }
106