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: void
48: get_ttysize(int *rowp, int *colp)
49: {
50: char *p;
51: #ifdef TIOCGWINSZ
52: struct winsize wsize;
53:
54: if (ioctl(STDERR_FILENO, TIOCGWINSZ, &wsize) == 0 &&
55: wsize.ws_row != 0 && wsize.ws_col != 0) {
56: *rowp = wsize.ws_row;
57: *colp = wsize.ws_col;
58: return;
59: }
60: #endif
61:
62: /* Fall back on $LINES and $COLUMNS. */
63: if ((p = getenv("LINES")) == NULL || (*rowp = atoi(p)) <= 0)
64: *rowp = 24;
65: if ((p = getenv("COLUMNS")) == NULL || (*colp = atoi(p)) <= 0)
66: *colp = 80;
67: }
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