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    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: }