From 12326f2e34cdfc028705ead5a2f6371bbec6ba1e Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Tue, 24 Jul 2012 18:51:22 +0200
Subject: [PATCH] Added $LINES and $COLUMNS to the shell.

This tests the fancy new system call tcgetwinsize(2).
---
 utils/mxsh.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/utils/mxsh.cpp b/utils/mxsh.cpp
index dfddb946..8e36d45e 100644
--- a/utils/mxsh.cpp
+++ b/utils/mxsh.cpp
@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <error.h>
 #include <fcntl.h>
+#include <termios.h>
 
 int status = 0;
 
@@ -41,6 +42,19 @@ void updatepwd()
 	setenv("PWD", wd, 1);
 }
 
+void updateenv()
+{
+	char str[128];
+	struct winsize ws;
+	if ( tcgetwinsize(0, &ws) == 0 )
+	{
+		sprintf(str, "%zu", ws.ws_col);
+		setenv("COLUMNS", str, 1);
+		sprintf(str, "%zu", ws.ws_row);
+		setenv("LINES", str, 1);
+	}
+}
+
 int runcommandline(const char** tokens)
 {
 	int result = 127;
@@ -192,6 +206,7 @@ readcmd:
 		}
 	}
 
+	updateenv();
 	char statusstr[32];
 	sprintf(statusstr, "%i", status);
 	setenv("?", statusstr, 1);