Add TIOCGWINSZ ioctl so userland can determine terminal geometry.

(Don't) use this to implement short-form output in ls.
I'm too tired to make a nice column formatting algorithm.
I just wanted something concise when I type "ls".

1 files changed, 7 insertions, 1 deletions

diff --git a/Userland/tst.cpp b/Userland/tst.cpp
index 9659a20aab..14463f691f 100644
--- a/Userland/tst.cpp
+++ b/Userland/tst.cpp
@@ -1,9 +1,15 @@
-#include <LibC/stdio.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
 
 int main(int argc, char** argv)
 {
     (void) argc;
     (void) argv;
+
+    struct winsize ws;
+    ioctl(0, TIOCGWINSZ, &ws);
+    printf("Terminal is %ux%u\n", ws.ws_col, ws.ws_row);
+
     printf("Counting to 100000: \033[s");
     for (unsigned i = 0; i <= 100000; ++i) {
         printf("\033[u\033[s%u", i);