LXR busybox/miscutils/ttysize.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Replacement for "stty size", which is awkward for shell script use.
   4 * - Allows to request width, height, or both, in any order.
   5 * - Does not complain on error, but returns width 80, height 24.
   6 * - Size: less than 200 bytes
   7 *
   8 * Copyright (C) 2007 by Denys Vlasenko <vda.linux@googlemail.com>
   9 *
  10 * Licensed under the GPL v2, see the file LICENSE in this tarball.
  11 */
  12#include "libbb.h"
  13
  14int ttysize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  15int ttysize_main(int argc, char **argv)
  16{
  17        unsigned w, h;
  18        struct winsize wsz;
  19
  20        w = 80;
  21        h = 24;
  22        if (!ioctl(0, TIOCGWINSZ, &wsz)) {
  23                w = wsz.ws_col;
  24                h = wsz.ws_row;
  25        }
  26
  27        if (argc == 1) {
  28                printf("%u %u", w, h);
  29        } else {
  30                const char *fmt, *arg;
  31
  32                fmt = "%u %u" + 3; /* "%u" */
  33                while ((arg = *++argv) != NULL) {
  34                        char c = arg[0];
  35                        if (c == 'w')
  36                                printf(fmt, w);
  37                        if (c == 'h')
  38                                printf(fmt, h);
  39                        fmt = "%u %u" + 2; /* " %u" */
  40                }
  41        }
  42        bb_putchar('\n');
  43        return 0;
  44}
  45