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sudo v 1.8.10p3

    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: #include <limits.h>
   37: 
   38: #include "missing.h"
   39: #include "sudo_debug.h"
   40: #include "sudo_util.h"
   41: 
   42: /* Compatibility with older tty systems. */
   43: #if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
   44: # define TIOCGWINSZ	TIOCGSIZE
   45: # define winsize	ttysize
   46: # define ws_col		ts_cols
   47: # define ws_row		ts_lines
   48: #endif
   49: 
   50: #ifdef TIOCGWINSZ
   51: static int
   52: get_ttysize_ioctl(int *rowp, int *colp)
   53: {
   54:     struct winsize wsize;
   55:     debug_decl(get_ttysize_ioctl, SUDO_DEBUG_EXEC)
   56: 
   57:     if (ioctl(STDERR_FILENO, TIOCGWINSZ, &wsize) == 0 &&
   58: 	wsize.ws_row != 0 && wsize.ws_col  != 0) {
   59: 	*rowp = wsize.ws_row;
   60: 	*colp = wsize.ws_col;
   61: 	debug_return_int(0);
   62:     }
   63:     debug_return_int(-1);
   64: }
   65: #else
   66: static int
   67: get_ttysize_ioctl(int *rowp, int *colp)
   68: {
   69:     return -1;
   70: }
   71: #endif /* TIOCGWINSZ */
   72: 
   73: void
   74: get_ttysize(int *rowp, int *colp)
   75: {
   76:     debug_decl(fork_cmnd, SUDO_DEBUG_EXEC)
   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 ||
   83: 	    (*rowp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
   84: 	    *rowp = 24;
   85: 	}
   86: 	if ((p = getenv("COLUMNS")) == NULL ||
   87: 	    (*colp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
   88: 	    *colp = 80;
   89: 	}
   90:     }
   91: 
   92:     debug_return;
   93: }