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Annotation of embedaddon/sudo/common/ttysize.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.2   misho       2:  * Copyright (c) 2010-2012 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       misho       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>
1.1.1.3 ! misho      36: #include <limits.h>
1.1       misho      37: 
                     38: #include "missing.h"
                     39: #include "sudo_debug.h"
1.1.1.3 ! misho      40: #include "sudo_util.h"
1.1       misho      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. */
1.1.1.3 ! misho      82:        if ((p = getenv("LINES")) == NULL ||
        !            83:            (*rowp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
1.1       misho      84:            *rowp = 24;
1.1.1.3 ! misho      85:        }
        !            86:        if ((p = getenv("COLUMNS")) == NULL ||
        !            87:            (*colp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
1.1       misho      88:            *colp = 80;
1.1.1.3 ! misho      89:        }
1.1       misho      90:     }
                     91: 
                     92:     debug_return;
                     93: }