Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

vendor/github.com/buger/goterm/README.md

@@ -0,0 +1,119 @@
+## Description
+
+This library provides basic building blocks for building advanced console UIs.
+
+Initially created for [Gor](http://github.com/buger/gor).
+
+Full API documentation: http://godoc.org/github.com/buger/goterm
+
+## Basic usage
+
+Full screen console app, printing current time:
+
+```go
+import (
+    tm "github.com/buger/goterm"
+    "time"
+)
+
+func main() {
+    tm.Clear() // Clear current screen
+
+    for {
+        // By moving cursor to top-left position we ensure that console output
+        // will be overwritten each time, instead of adding new.
+        tm.MoveCursor(1,1)
+
+        tm.Println("Current Time:", time.Now().Format(time.RFC1123))
+
+        tm.Flush() // Call it every time at the end of rendering
+
+        time.Sleep(time.Second)
+    }
+}
+```
+
+This can be seen in [examples/time_example.go](examples/time_example.go).  To
+run it yourself, go into your `$GOPATH/src/github.com/buger/goterm` directory
+and run `go run ./examples/time_example.go`
+
+
+Print red bold message on white background:
+
+```go    
+tm.Println(tm.Background(tm.Color(tm.Bold("Important header"), tm.RED), tm.WHITE))
+```
+
+
+Create box and move it to center of the screen:
+
+```go
+tm.Clear()
+
+// Create Box with 30% width of current screen, and height of 20 lines
+box := tm.NewBox(30|tm.PCT, 20, 0)
+
+// Add some content to the box
+// Note that you can add ANY content, even tables
+fmt.Fprint(box, "Some box content")
+
+// Move Box to approx center of the screen
+tm.Print(tm.MoveTo(box.String(), 40|tm.PCT, 40|tm.PCT))
+
+tm.Flush()
+```
+
+This can be found in [examples/box_example.go](examples/box_example.go).
+
+Draw table:
+
+```go
+// Based on http://golang.org/pkg/text/tabwriter
+totals := tm.NewTable(0, 10, 5, ' ', 0)
+fmt.Fprintf(totals, "Time\tStarted\tActive\tFinished\n")
+fmt.Fprintf(totals, "%s\t%d\t%d\t%d\n", "All", started, started-finished, finished)
+tm.Println(totals)
+tm.Flush()
+```
+
+This can be found in [examples/table_example.go](examples/table_example.go).
+
+## Line charts
+
+Chart example:
+
+![screen shot 2013-07-09 at 5 05 37 pm](https://f.cloud.github.com/assets/14009/767676/e3dd35aa-e887-11e2-9cd2-f6451eb26adc.png)
+
+
+```go
+    import (
+        tm "github.com/buger/goterm"
+    )
+
+    chart := tm.NewLineChart(100, 20)
+    
+    data := new(tm.DataTable)
+    data.addColumn("Time")
+    data.addColumn("Sin(x)")
+	data.addColumn("Cos(x+1)")
+
+    for i := 0.1; i < 10; i += 0.1 {
+		data.addRow(i, math.Sin(i), math.Cos(i+1))
+	}
+    
+    tm.Println(chart.Draw(data))
+```
+
+This can be found in [examples/chart_example.go](examples/chart_example.go).
+
+Drawing 2 separate graphs in different scales. Each graph have its own Y axe.
+
+```go
+chart.Flags = tm.DRAW_INDEPENDENT
+```
+
+Drawing graph with relative scale (Grapwh draw starting from min value instead of zero)
+
+```go
+chart.Flags = tm.DRAW_RELATIVE
+```

vendor/github.com/buger/goterm/box.go

@@ -0,0 +1,122 @@
+package goterm
+
+import (
+	"bytes"
+	"strings"
+)
+
+const DEFAULT_BORDER = "- │ ┌ ┐ └ ┘"
+
+// Box allows you to create independent parts of screen, with its own buffer and borders.
+// Can be used for creating modal windows
+//
+// Generates boxes likes this:
+// ┌--------┐
+// │hello   │
+// │world   │
+// │        │
+// └--------┘
+//
+type Box struct {
+	Buf *bytes.Buffer
+
+	Width  int
+	Height int
+
+	// To get even padding: PaddingX ~= PaddingY*4
+	PaddingX int
+	PaddingY int
+
+	// Should contain 6 border pieces separated by spaces
+	//
+	// Example border:
+	//   "- │ ┌ ┐ └ ┘"
+	Border string
+
+	Flags int // Not used now
+}
+
+// Create new Box.
+// Width and height can be relative:
+//
+//    // Create box with 50% with of current screen and 10 lines height
+//    box := tm.NewBox(50|tm.PCT, 10, 0)
+//
+func NewBox(width, height int, flags int) *Box {
+	width, height = GetXY(width, height)
+
+	box := new(Box)
+	box.Buf = new(bytes.Buffer)
+	box.Width = width
+	box.Height = height
+	box.Border = DEFAULT_BORDER
+	box.PaddingX = 1
+	box.PaddingY = 0
+	box.Flags = flags
+
+	return box
+}
+
+func (b *Box) Write(p []byte) (int, error) {
+	return b.Buf.Write(p)
+}
+
+// Render Box
+func (b *Box) String() (out string) {
+	borders := strings.Split(b.Border, " ")
+	lines := strings.Split(b.Buf.String(), "\n")
+
+	// Border + padding
+	prefix := borders[1] + strings.Repeat(" ", b.PaddingX)
+	suffix := strings.Repeat(" ", b.PaddingX) + borders[1]
+
+	offset := b.PaddingY + 1 // 1 is border width
+
+	// Content width without borders and padding
+	contentWidth := b.Width - (b.PaddingX+1)*2
+
+	for y := 0; y < b.Height; y++ {
+		var line string
+
+		switch {
+		// Draw borders for first line
+		case y == 0:
+			line = borders[2] + strings.Repeat(borders[0], b.Width-2) + borders[3]
+
+		// Draw borders for last line
+		case y == (b.Height - 1):
+			line = borders[4] + strings.Repeat(borders[0], b.Width-2) + borders[5]
+
+		// Draw top and bottom padding
+		case y <= b.PaddingY || y >= (b.Height-b.PaddingY):
+			line = borders[1] + strings.Repeat(" ", b.Width-2) + borders[1]
+
+		// Render content
+		default:
+			if len(lines) > y-offset {
+				line = lines[y-offset]
+			} else {
+				line = ""
+			}
+
+			if len(line) > contentWidth-1 {
+				// If line is too large limit it
+				line = line[0:contentWidth]
+			} else {
+				// If line is too small enlarge it by adding spaces
+				line = line + strings.Repeat(" ", contentWidth-len(line))
+			}
+
+			line = prefix + line + suffix
+		}
+
+		// Don't add newline for last element
+		if y != b.Height-1 {
+			line = line + "\n"
+		}
+
+		out += line
+	}
+
+	return out
+}

vendor/github.com/buger/goterm/plot.go

@@ -0,0 +1,328 @@
+package goterm
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+const (
+	AXIS_LEFT = iota
+	AXIS_RIGHT
+)
+
+const (
+	DRAW_INDEPENDENT = 1 << iota
+	DRAW_RELATIVE
+)
+
+type DataTable struct {
+	columns []string
+
+	rows [][]float64
+}
+
+func (d *DataTable) AddColumn(name string) {
+	d.columns = append(d.columns, name)
+}
+
+func (d *DataTable) AddRow(elms ...float64) {
+	d.rows = append(d.rows, elms)
+}
+
+type Chart interface {
+	Draw(data DataTable, flags int) string
+}
+
+type LineChart struct {
+	Buf      []string
+	chartBuf []string
+
+	data *DataTable
+
+	Width  int
+	Height int
+
+	chartHeight int
+	chartWidth  int
+
+	paddingX int
+
+	paddingY int
+
+	Flags int
+}
+
+func genBuf(size int) []string {
+	buf := make([]string, size)
+
+	for i := 0; i < size; i++ {
+		buf[i] = " "
+	}
+
+	return buf
+}
+
+// Format float
+func ff(num interface{}) string {
+	return fmt.Sprintf("%.1f", num)
+}
+
+func NewLineChart(width, height int) *LineChart {
+	chart := new(LineChart)
+	chart.Width = width
+	chart.Height = height
+	chart.Buf = genBuf(width * height)
+
+	// axis lines + axies text
+	chart.paddingY = 2
+
+	return chart
+}
+
+func (c *LineChart) DrawAxes(maxX, minX, maxY, minY float64, index int) {
+	side := AXIS_LEFT
+
+	if c.Flags&DRAW_INDEPENDENT != 0 {
+		if index%2 == 0 {
+			side = AXIS_RIGHT
+		}
+
+		c.DrawLine(c.paddingX-1, 1, c.Width-c.paddingX, 1, "-")
+	} else {
+		c.DrawLine(c.paddingX-1, 1, c.Width-1, 1, "-")
+	}
+
+	if side == AXIS_LEFT {
+		c.DrawLine(c.paddingX-1, 1, c.paddingX-1, c.Height-1, "│")
+	} else {
+		c.DrawLine(c.Width-c.paddingX, 1, c.Width-c.paddingX, c.Height-1, "│")
+	}
+
+	left := 0
+	if side == AXIS_RIGHT {
+		left = c.Width - c.paddingX + 1
+	}
+
+	if c.Flags&DRAW_RELATIVE != 0 {
+		c.writeText(ff(minY), left, 1)
+	} else {
+		if minY > 0 {
+			c.writeText("0", left, 1)
+		} else {
+			c.writeText(ff(minY), left, 1)
+		}
+	}
+
+	c.writeText(ff(maxY), left, c.Height-1)
+
+	c.writeText(ff(minX), c.paddingX, 0)
+
+	x_col := c.data.columns[0]
+	c.writeText(c.data.columns[0], c.Width/2-len(x_col)/2, 1)
+
+	if c.Flags&DRAW_INDEPENDENT != 0 || len(c.data.columns) < 3 {
+		col := c.data.columns[index]
+
+		for idx, char := range strings.Split(col, "") {
+			start_from := c.Height/2 + len(col)/2 - idx
+
+			if side == AXIS_LEFT {
+				c.writeText(char, c.paddingX-1, start_from)
+			} else {
+				c.writeText(char, c.Width-c.paddingX, start_from)
+			}
+		}
+	}
+
+	if c.Flags&DRAW_INDEPENDENT != 0 {
+		c.writeText(ff(maxX), c.Width-c.paddingX-len(ff(maxX)), 0)
+	} else {
+		c.writeText(ff(maxX), c.Width-len(ff(maxX)), 0)
+	}
+}
+
+func (c *LineChart) writeText(text string, x, y int) {
+	coord := y*c.Width + x
+
+	for idx, char := range strings.Split(text, "") {
+		c.Buf[coord+idx] = char
+	}
+}
+
+func (c *LineChart) Draw(data *DataTable) (out string) {
+	var scaleY, scaleX float64
+
+	c.data = data
+
+	if c.Flags&DRAW_INDEPENDENT != 0 && len(data.columns) > 3 {
+		fmt.Println("Error: Can't use DRAW_INDEPENDENT for more then 2 graphs")
+		return ""
+	}
+
+	charts := len(data.columns) - 1
+
+	prevPoint := [2]int{-1, -1}
+
+	maxX, minX, maxY, minY := getBoundaryValues(data, -1)
+
+	c.paddingX = int(math.Max(float64(len(ff(minY))), float64(len(ff(maxY))))) + 1
+
+	c.chartHeight = c.Height - c.paddingY
+
+	if c.Flags&DRAW_INDEPENDENT != 0 {
+		c.chartWidth = c.Width - 2*c.paddingX
+	} else {
+		c.chartWidth = c.Width - c.paddingX - 1
+	}
+
+	scaleX = float64(c.chartWidth) / (maxX - minX)
+
+	if c.Flags&DRAW_RELATIVE != 0 || minY < 0 {
+		scaleY = float64(c.chartHeight) / (maxY - minY)
+	} else {
+		scaleY = float64(c.chartHeight) / maxY
+	}
+
+	for i := 1; i < charts+1; i++ {
+		if c.Flags&DRAW_INDEPENDENT != 0 {
+			maxX, minX, maxY, minY = getBoundaryValues(data, i)
+
+			scaleX = float64(c.chartWidth-1) / (maxX - minX)
+			scaleY = float64(c.chartHeight) / maxY
+
+			if c.Flags&DRAW_RELATIVE != 0 || minY < 0 {
+				scaleY = float64(c.chartHeight) / (maxY - minY)
+			}
+		}
+
+		symbol := Color("•", i)
+
+		c_data := getChartData(data, i)
+
+		for _, point := range c_data {
+			x := int((point[0]-minX)*scaleX) + c.paddingX
+			y := int((point[1])*scaleY) + c.paddingY
+
+			if c.Flags&DRAW_RELATIVE != 0 || minY < 0 {
+				y = int((point[1]-minY)*scaleY) + c.paddingY
+			}
+
+			if prevPoint[0] == -1 {
+				prevPoint[0] = x
+				prevPoint[1] = y
+			}
+
+			if prevPoint[0] <= x {
+				c.DrawLine(prevPoint[0], prevPoint[1], x, y, symbol)
+			}
+
+			prevPoint[0] = x
+			prevPoint[1] = y
+		}
+
+		c.DrawAxes(maxX, minX, maxY, minY, i)
+	}
+
+	for row := c.Height - 1; row >= 0; row-- {
+		out += strings.Join(c.Buf[row*c.Width:(row+1)*c.Width], "") + "\n"
+	}
+
+	return
+}
+
+func (c *LineChart) DrawLine(x0, y0, x1, y1 int, symbol string) {
+	drawLine(x0, y0, x1, y1, func(x, y int) {
+		coord := y*c.Width + x
+
+		if coord > 0 && coord < len(c.Buf) {
+			c.Buf[coord] = symbol
+		}
+	})
+}
+
+func getBoundaryValues(data *DataTable, index int) (maxX, minX, maxY, minY float64) {
+	maxX = data.rows[0][0]
+	minX = data.rows[0][0]
+	maxY = data.rows[0][1]
+	minY = data.rows[0][1]
+
+	for _, r := range data.rows {
+		maxX = math.Max(maxX, r[0])
+		minX = math.Min(minX, r[0])
+
+		for idx, c := range r {
+			if idx > 0 {
+				if index == -1 || index == idx {
+					maxY = math.Max(maxY, c)
+					minY = math.Min(minY, c)
+				}
+			}
+		}
+	}
+
+	if maxY > 0 {
+		maxY = maxY * 1.1
+	} else {
+		maxY = maxY * 0.9
+	}
+
+	if minY > 0 {
+		minY = minY * 0.9
+	} else {
+		minY = minY * 1.1
+	}
+
+	return
+}
+
+// DataTable can contain data for multiple graphs, we need to extract only 1
+func getChartData(data *DataTable, index int) (out [][]float64) {
+	for _, r := range data.rows {
+		out = append(out, []float64{r[0], r[index]})
+	}
+
+	return
+}
+
+// Algorithm for drawing line between two points
+//
+// http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
+func drawLine(x0, y0, x1, y1 int, plot func(int, int)) {
+	dx := x1 - x0
+	if dx < 0 {
+		dx = -dx
+	}
+	dy := y1 - y0
+	if dy < 0 {
+		dy = -dy
+	}
+	var sx, sy int
+	if x0 < x1 {
+		sx = 1
+	} else {
+		sx = -1
+	}
+	if y0 < y1 {
+		sy = 1
+	} else {
+		sy = -1
+	}
+	err := dx - dy
+
+	for {
+		plot(x0, y0)
+		if x0 == x1 && y0 == y1 {
+			break
+		}
+		e2 := 2 * err
+		if e2 > -dy {
+			err -= dy
+			x0 += sx
+		}
+		if e2 < dx {
+			err += dx
+			y0 += sy
+		}
+	}
+}

vendor/github.com/buger/goterm/table.go

@@ -0,0 +1,34 @@
+package goterm
+
+import (
+	"bytes"
+	"text/tabwriter"
+)
+
+// Tabwriter with own buffer:
+//
+//     	totals := tm.NewTable(0, 10, 5, ' ', 0)
+// 		fmt.Fprintf(totals, "Time\tStarted\tActive\tFinished\n")
+//		fmt.Fprintf(totals, "%s\t%d\t%d\t%d\n", "All", started, started-finished, finished)
+//		tm.Println(totals)
+//
+//  Based on http://golang.org/pkg/text/tabwriter
+type Table struct {
+	tabwriter.Writer
+
+	Buf *bytes.Buffer
+}
+
+// Same as here http://golang.org/pkg/text/tabwriter/#Writer.Init
+func NewTable(minwidth, tabwidth, padding int, padchar byte, flags uint) *Table {
+	tbl := new(Table)
+	tbl.Buf = new(bytes.Buffer)
+	tbl.Init(tbl.Buf, minwidth, tabwidth, padding, padchar, flags)
+
+	return tbl
+}
+
+func (t *Table) String() string {
+	t.Flush()
+	return t.Buf.String()
+}

vendor/github.com/buger/goterm/terminal.go

@@ -0,0 +1,258 @@
+// Provides basic bulding blocks for advanced console UI
+//
+// Coordinate system:
+//
+//  1/1---X---->
+//   |
+//   Y
+//   |
+//   v
+//
+// Documentation for ANSI codes: http://en.wikipedia.org/wiki/ANSI_escape_code#Colors
+//
+// Inspired by: http://www.darkcoding.net/software/pretty-command-line-console-output-on-unix-in-python-and-go-lang/
+package goterm
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// Reset all custom styles
+const RESET = "\033[0m"
+
+// Reset to default color
+const RESET_COLOR = "\033[32m"
+
+// Return curor to start of line and clean it
+const RESET_LINE = "\r\033[K"
+
+// List of possible colors
+const (
+	BLACK = iota
+	RED
+	GREEN
+	YELLOW
+	BLUE
+	MAGENTA
+	CYAN
+	WHITE
+)
+
+var Output *bufio.Writer = bufio.NewWriter(os.Stdout)
+
+func getColor(code int) string {
+	return fmt.Sprintf("\033[3%dm", code)
+}
+
+func getBgColor(code int) string {
+	return fmt.Sprintf("\033[4%dm", code)
+}
+
+// Set percent flag: num | PCT
+//
+// Check percent flag: num & PCT
+//
+// Reset percent flag: num & 0xFF
+const shift = uint(^uint(0)>>63) << 4
+const PCT = 0x8000 << shift
+
+type winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+// Global screen buffer
+// Its not recommented write to buffer dirrectly, use package Print,Printf,Println fucntions instead.
+var Screen *bytes.Buffer = new(bytes.Buffer)
+
+// Get relative or absolute coorditantes
+// To get relative, set PCT flag to number:
+//
+//      // Get 10% of total width to `x` and 20 to y
+//      x, y = tm.GetXY(10|tm.PCT, 20)
+//
+func GetXY(x int, y int) (int, int) {
+	if y == -1 {
+		y = CurrentHeight() + 1
+	}
+
+	if x&PCT != 0 {
+		x = int((x & 0xFF) * Width() / 100)
+	}
+
+	if y&PCT != 0 {
+		y = int((y & 0xFF) * Height() / 100)
+	}
+
+	return x, y
+}
+
+type sf func(int, string) string
+
+// Apply given transformation func for each line in string
+func applyTransform(str string, transform sf) (out string) {
+	out = ""
+
+	for idx, line := range strings.Split(str, "\n") {
+		out += transform(idx, line)
+	}
+
+	return
+}
+
+// Clear screen
+func Clear() {
+	Output.WriteString("\033[2J")
+}
+
+// Move cursor to given position
+func MoveCursor(x int, y int) {
+	fmt.Fprintf(Screen, "\033[%d;%dH", x, y)
+}
+
+// Move cursor up relative the current position
+func MoveCursorUp(bias int) {
+	fmt.Fprintf(Screen, "\033[%dA", bias)
+}
+
+// Move cursor down relative the current position
+func MoveCursorDown(bias int) {
+	fmt.Fprintf(Screen, "\033[%dB", bias)
+}
+
+// Move cursor forward relative the current position
+func MoveCursorForward(bias int) {
+	fmt.Fprintf(Screen, "\033[%dC", bias)
+}
+
+// Move cursor backward relative the current position
+func MoveCursorBackward(bias int) {
+	fmt.Fprintf(Screen, "\033[%dD", bias)
+}
+
+// Move string to possition
+func MoveTo(str string, x int, y int) (out string) {
+	x, y = GetXY(x, y)
+
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("\033[%d;%dH%s", y+idx, x, line)
+	})
+}
+
+// Return carrier to start of line
+func ResetLine(str string) (out string) {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf(RESET_LINE, line)
+	})
+}
+
+// Make bold
+func Bold(str string) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("\033[1m%s\033[0m", line)
+	})
+}
+
+// Apply given color to string:
+//
+//     tm.Color("RED STRING", tm.RED)
+//
+func Color(str string, color int) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("%s%s%s", getColor(color), line, RESET)
+	})
+}
+
+func Highlight(str, substr string, color int) string {
+	hiSubstr := Color(substr, color)
+	return strings.Replace(str, substr, hiSubstr, -1)
+}
+
+func HighlightRegion(str string, from, to, color int) string {
+	return str[:from] + Color(str[from:to], color) + str[to:]
+}
+
+// Change background color of string:
+//
+//     tm.Background("string", tm.RED)
+//
+func Background(str string, color int) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("%s%s%s", getBgColor(color), line, RESET)
+	})
+}
+
+// Get console width
+func Width() int {
+	ws, err := getWinsize()
+
+	if err != nil {
+		return -1
+	}
+
+	return int(ws.Col)
+}
+
+// Get console height
+func Height() int {
+	ws, err := getWinsize()
+	if err != nil {
+		return -1
+	}
+	return int(ws.Row)
+}
+
+// Get current height. Line count in Screen buffer.
+func CurrentHeight() int {
+	return strings.Count(Screen.String(), "\n")
+}
+
+// Flush buffer and ensure that it will not overflow screen
+func Flush() {
+	for idx, str := range strings.Split(Screen.String(), "\n") {
+		if idx > Height() {
+			return
+		}
+
+		Output.WriteString(str + "\n")
+	}
+
+	Output.Flush()
+	Screen.Reset()
+}
+
+func Print(a ...interface{}) (n int, err error) {
+	return fmt.Fprint(Screen, a...)
+}
+
+func Println(a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(Screen, a...)
+}
+
+func Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(Screen, format, a...)
+}
+
+func Context(data string, idx, max int) string {
+	var start, end int
+
+	if len(data[:idx]) < (max / 2) {
+		start = 0
+	} else {
+		start = idx - max/2
+	}
+
+	if len(data)-idx < (max / 2) {
+		end = len(data) - 1
+	} else {
+		end = idx + max/2
+	}
+
+	return data[start:end]
+}

vendor/github.com/buger/goterm/terminal_nosysioctl.go

@@ -0,0 +1,12 @@
+// +build windows plan9 solaris
+
+package goterm
+
+func getWinsize() (*winsize, error) {
+	ws := new(winsize)
+
+	ws.Col = 80
+	ws.Row = 24
+
+	return ws, nil
+}

vendor/github.com/buger/goterm/terminal_sysioctl.go

@@ -0,0 +1,36 @@
+// +build !windows,!plan9,!solaris
+
+package goterm
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+func getWinsize() (*winsize, error) {
+	ws := new(winsize)
+
+	var _TIOCGWINSZ int64
+
+	switch runtime.GOOS {
+	case "linux":
+		_TIOCGWINSZ = 0x5413
+	case "darwin":
+		_TIOCGWINSZ = 1074295912
+	}
+
+	r1, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
+		uintptr(syscall.Stdin),
+		uintptr(_TIOCGWINSZ),
+		uintptr(unsafe.Pointer(ws)),
+	)
+
+	if int(r1) == -1 {
+		fmt.Println("Error:", os.NewSyscallError("GetWinsize", errno))
+		return nil, os.NewSyscallError("GetWinsize", errno)
+	}
+	return ws, nil
+}