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Annotation of embedaddon/sudo/common/ttysize.c, revision 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: #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: }