1/*
2 * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
16 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
17 */
18
19#include <config.h>
20
21#include <sys/types.h>
22#include <sys/ioctl.h>
23#include <stdio.h>
24#ifdef STDC_HEADERS
25# include <stdlib.h>
26# include <stddef.h>
27#else
28# ifdef HAVE_STDLIB_H
29#  include <stdlib.h>
30# endif
31#endif /* STDC_HEADERS */
32#ifdef HAVE_UNISTD_H
33# include <unistd.h>
34#endif /* HAVE_UNISTD_H */
35#include <termios.h>
36
37#include "missing.h"
38
39/* Compatibility with older tty systems. */
40#if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
41# define TIOCGWINSZ	TIOCGSIZE
42# define winsize	ttysize
43# define ws_col		ts_cols
44# define ws_row		ts_lines
45#endif
46
47#ifdef TIOCGWINSZ
48static int
49get_ttysize_ioctl(rowp, colp)
50    int *rowp;
51    int *colp;
52{
53    struct winsize wsize;
54
55    if (ioctl(STDERR_FILENO, TIOCGWINSZ, &wsize) == 0 &&
56	wsize.ws_row != 0 && wsize.ws_col  != 0) {
57	*rowp = wsize.ws_row;
58	*colp = wsize.ws_col;
59	return 0;
60    }
61    return -1;
62}
63#else
64static int
65get_ttysize_ioctl(rowp, colp)
66    int *rowp;
67    int *colp;
68{
69    return -1;
70}
71#endif /* TIOCGWINSZ */
72
73void
74get_ttysize(rowp, colp)
75    int *rowp;
76    int *colp;
77{
78    if (get_ttysize_ioctl(rowp, colp) == -1) {
79	char *p;
80
81	/* Fall back on $LINES and $COLUMNS. */
82	if ((p = getenv("LINES")) == NULL || (*rowp = atoi(p)) <= 0)
83	    *rowp = 24;
84	if ((p = getenv("COLUMNS")) == NULL || (*colp = atoi(p)) <= 0)
85	    *colp = 80;
86    }
87
88    return;
89}
90