src/rt/tty.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  tty.c - i/o for terminal drivers.
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include  <stdio.h>
#include  <signal.h>
#include  <fcntl.h>
#include  <sys/ioctl.h>

#include  "driver.h"

/*
 *  Drivers using these routines must call getch()
 *  for input from stdin.
 */

struct sgttyb  ttymode;                 /* original tty modes */

int  ttyfd;                             /* tty file descriptor */

struct driver  *ttydev;                 /* tty device */


ttyset(dev, fd)                         /* set up raw tty device */
struct driver  *dev;
int  fd;
{
        int  ttyin(), newinp();
        struct sgttyb  flags;

        if (!isatty(fd))
                return(-1);

        ttyfd = fd;
        ioctl(ttyfd, TIOCGETP, &ttymode);
        ioctl(ttyfd, TIOCGETP, &flags);
        flags.sg_flags |= RAW;                  /* also turns output */
        flags.sg_flags &= ~ECHO;                /* processing off */
        ioctl(ttyfd, TIOCSETP, &flags);
                                                /* install input handler */
        ttydev = dev;
        ttydev->comin = ttyin;
        ttydev->inpready = 0;
        signal(SIGIO, newinp);
        fcntl(ttyfd, F_SETFL, FASYNC);
        return(0);
}


ttydone()                               /* restore tty modes */
{
        fcntl(ttyfd, F_SETFL, 0);
        signal(SIGIO, SIG_DFL);
        ioctl(ttyfd, TIOCSETP, &ttymode);
        ttydev->comin = NULL;
        ttydev->inpready = 0;
        ttydev = NULL;
}


int
getch()                                 /* get a character in raw mode */
{
        register int  c;

        fcntl(ttyfd, F_SETFL, 0);               /* allow read to block */
        if (ttydev->inpready > 0)
                ttydev->inpready--;
        c = getchar();
        fcntl(ttyfd, F_SETFL, FASYNC);
        return(c);
}


static
ttyin(buf, prompt)                      /* read a line in raw mode */
char  *buf, *prompt;
{
        int  getch();

        if (prompt != NULL)
                (*ttydev->comout)(prompt);
        editline(buf, getch, ttydev->comout);
}


static
newinp()                                /* new input */
{
        ttydev->inpready++;
}
Revision:	2.2
Committed:	Sat Feb 22 02:07:29 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.1:	+57 -5 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* tty.c - i/o for terminal drivers.
6	*/
7
8	/* ====================================================================
9	* The Radiance Software License, Version 1.0
10	*
11	* Copyright (c) 1990 - 2002 The Regents of the University of California,
12	* through Lawrence Berkeley National Laboratory. All rights reserved.
13	*
14	* Redistribution and use in source and binary forms, with or without
15	* modification, are permitted provided that the following conditions
16	* are met:
17	*
18	* 1. Redistributions of source code must retain the above copyright
19	* notice, this list of conditions and the following disclaimer.
20	*
21	* 2. Redistributions in binary form must reproduce the above copyright
22	* notice, this list of conditions and the following disclaimer in
23	* the documentation and/or other materials provided with the
24	* distribution.
25	*
26	* 3. The end-user documentation included with the redistribution,
27	* if any, must include the following acknowledgment:
28	* "This product includes Radiance software
29	* (http://radsite.lbl.gov/)
30	* developed by the Lawrence Berkeley National Laboratory
31	* (http://www.lbl.gov/)."
32	* Alternately, this acknowledgment may appear in the software itself,
33	* if and wherever such third-party acknowledgments normally appear.
34	*
35	* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
36	* and "The Regents of the University of California" must
37	* not be used to endorse or promote products derived from this
38	* software without prior written permission. For written
39	* permission, please contact [email protected].
40	*
41	* 5. Products derived from this software may not be called "Radiance",
42	* nor may "Radiance" appear in their name, without prior written
43	* permission of Lawrence Berkeley National Laboratory.
44	*
45	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
46	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
48	* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
49	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
52	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
53	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
55	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56	* SUCH DAMAGE.
57	* ====================================================================
58	*
59	* This software consists of voluntary contributions made by many
60	* individuals on behalf of Lawrence Berkeley National Laboratory. For more
61	* information on Lawrence Berkeley National Laboratory, please see
62	* <http://www.lbl.gov/>.
63	*/
64
65	#include <stdio.h>
66	#include <signal.h>
67	#include <fcntl.h>
68	#include <sys/ioctl.h>
69
70	#include "driver.h"
71
72	/*
73	* Drivers using these routines must call getch()
74	* for input from stdin.
75	*/
76
77	struct sgttyb ttymode; /* original tty modes */
78
79	int ttyfd; /* tty file descriptor */
80
81	struct driver ttydev; / tty device */
82
83
84	ttyset(dev, fd) /* set up raw tty device */
85	struct driver *dev;
86	int fd;
87	{
88	int ttyin(), newinp();
89	struct sgttyb flags;
90
91	if (!isatty(fd))
92	return(-1);
93
94	ttyfd = fd;
95	ioctl(ttyfd, TIOCGETP, &ttymode);
96	ioctl(ttyfd, TIOCGETP, &flags);
97	flags.sg_flags \|= RAW; /* also turns output */
98	flags.sg_flags &= ~ECHO; /* processing off */
99	ioctl(ttyfd, TIOCSETP, &flags);
100	/* install input handler */
101	ttydev = dev;
102	ttydev->comin = ttyin;
103	ttydev->inpready = 0;
104	signal(SIGIO, newinp);
105	fcntl(ttyfd, F_SETFL, FASYNC);
106	return(0);
107	}
108
109
110	ttydone() /* restore tty modes */
111	{
112	fcntl(ttyfd, F_SETFL, 0);
113	signal(SIGIO, SIG_DFL);
114	ioctl(ttyfd, TIOCSETP, &ttymode);
115	ttydev->comin = NULL;
116	ttydev->inpready = 0;
117	ttydev = NULL;
118	}
119
120
121	int
122	getch() /* get a character in raw mode */
123	{
124	register int c;
125
126	fcntl(ttyfd, F_SETFL, 0); /* allow read to block */
127	if (ttydev->inpready > 0)
128	ttydev->inpready--;
129	c = getchar();
130	fcntl(ttyfd, F_SETFL, FASYNC);
131	return(c);
132	}
133
134
135	static
136	ttyin(buf, prompt) /* read a line in raw mode */
137	char buf, prompt;
138	{
139	int getch();
140
141	if (prompt != NULL)
142	(*ttydev->comout)(prompt);
143	editline(buf, getch, ttydev->comout);
144	}
145
146
147	static
148	newinp() /* new input */
149	{
150	ttydev->inpready++;
151	}