ttysize: if stdin is not tty, try stdout, then stderr

function                                             old     new   delta
ttysize_main                                         135     175     +40
packed_usage                                       31686   31672     -14

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/miscutils/ttysize.c b/miscutils/ttysize.c
index 135ce8535..cba65b148 100644
--- a/miscutils/ttysize.c
+++ b/miscutils/ttysize.c
@@ -25,7 +25,7 @@
 //usage:#define ttysize_trivial_usage
 //usage:       "[w] [h]"
 //usage:#define ttysize_full_usage "\n\n"
-//usage:       "Print dimension(s) of stdin's terminal, on error return 80x25"
+//usage:       "Print dimensions of stdin tty, or 80x24"
 
 #include "libbb.h"
 
@@ -37,7 +37,10 @@ int ttysize_main(int argc UNUSED_PARAM, char **argv)
 
         w = 80;
         h = 24;
-        if (!ioctl(0, TIOCGWINSZ, &wsz)) {
+        if (ioctl(0, TIOCGWINSZ, &wsz) == 0
+         || ioctl(1, TIOCGWINSZ, &wsz) == 0
+         || ioctl(2, TIOCGWINSZ, &wsz) == 0
+        ) {
                 w = wsz.ws_col;
                 h = wsz.ws_row;
         }