1: /*
2: * Copyright (c) 2010-2012 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: #include "sudo_debug.h"
39:
40: /* Compatibility with older tty systems. */
41: #if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
42: # define TIOCGWINSZ TIOCGSIZE
43: # define winsize ttysize
44: # define ws_col ts_cols
45: # define ws_row ts_lines
46: #endif
47:
48: #ifdef TIOCGWINSZ
49: static int
50: get_ttysize_ioctl(int *rowp, int *colp)
51: {
52: struct winsize wsize;
53: debug_decl(get_ttysize_ioctl, SUDO_DEBUG_EXEC)
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: debug_return_int(0);
60: }
61: debug_return_int(-1);
62: }
63: #else
64: static int
65: get_ttysize_ioctl(int *rowp, int *colp)
66: {
67: return -1;
68: }
69: #endif /* TIOCGWINSZ */
70:
71: void
72: get_ttysize(int *rowp, int *colp)
73: {
74: debug_decl(fork_cmnd, SUDO_DEBUG_EXEC)
75:
76: if (get_ttysize_ioctl(rowp, colp) == -1) {
77: char *p;
78:
79: /* Fall back on $LINES and $COLUMNS. */
80: if ((p = getenv("LINES")) == NULL || (*rowp = atoi(p)) <= 0)
81: *rowp = 24;
82: if ((p = getenv("COLUMNS")) == NULL || (*colp = atoi(p)) <= 0)
83: *colp = 80;
84: }
85:
86: debug_return;
87: }
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