release/src/router/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 GPLv2, see file LICENSE in this source tree.
  11  */
  12
  13 //usage:#define ttysize_trivial_usage
  14 //usage:       "[w] [h]"
  15 //usage:#define ttysize_full_usage "\n\n"
  16 //usage:       "Print dimension(s) of stdin's terminal, on error return 80x25"
  17
  18 #include "libbb.h"
  19
  20 int ttysize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21 int ttysize_main(int argc UNUSED_PARAM, char **argv)
  22 {
  23         unsigned w, h;
  24         struct winsize wsz;
  25
  26         w = 80;
  27         h = 24;
  28         if (!ioctl(0, TIOCGWINSZ, &wsz)) {
  29                 w = wsz.ws_col;
  30                 h = wsz.ws_row;
  31         }
  32
  33         if (!argv[1]) {
  34                 printf("%u %u", w, h);
  35         } else {
  36                 const char *fmt, *arg;
  37
  38                 fmt = "%u %u" + 3; /* "%u" */
  39                 while ((arg = *++argv) != NULL) {
  40                         char c = arg[0];
  41                         if (c == 'w')
  42                                 printf(fmt, w);
  43                         if (c == 'h')
  44                                 printf(fmt, h);
  45                         fmt = "%u %u" + 2; /* " %u" */
  46                 }
  47         }
  48         bb_putchar('\n');
  49         return 0;
  50 }