added sysctl for terminal-width retrieval

1 files changed, 29 insertions, 0 deletions

diff --git a/winsize.go b/winsize.go
new file mode 100644
index 0000000..1a3bdaf
--- /dev/null
+++ b/winsize.go
@@ -0,0 +1,29 @@
+package main
+
+// +build linux
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+type winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+func init() {
+	ws := &winsize{}
+	retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
+		uintptr(syscall.Stdin),
+		uintptr(syscall.TIOCGWINSZ),
+		uintptr(unsafe.Pointer(ws)))
+
+	if int(retCode) == -1 {
+		panic(errno)
+	}
+
+	Width = int(ws.Col)
+}