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Annotation of embedaddon/sudo/src/ttysize.c, revision 1.1.1.1

1.1       misho       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: }