go mod vendor

vendor/github.com/creack/pty/util.go

@@ -0,0 +1,64 @@
+// +build !windows,!solaris
+
+package pty
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// InheritSize applies the terminal size of pty to tty. This should be run
+// in a signal handler for syscall.SIGWINCH to automatically resize the tty when
+// the pty receives a window size change notification.
+func InheritSize(pty, tty *os.File) error {
+	size, err := GetsizeFull(pty)
+	if err != nil {
+		return err
+	}
+	err = Setsize(tty, size)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// Setsize resizes t to s.
+func Setsize(t *os.File, ws *Winsize) error {
+	return windowRectCall(ws, t.Fd(), syscall.TIOCSWINSZ)
+}
+
+// GetsizeFull returns the full terminal size description.
+func GetsizeFull(t *os.File) (size *Winsize, err error) {
+	var ws Winsize
+	err = windowRectCall(&ws, t.Fd(), syscall.TIOCGWINSZ)
+	return &ws, err
+}
+
+// Getsize returns the number of rows (lines) and cols (positions
+// in each line) in terminal t.
+func Getsize(t *os.File) (rows, cols int, err error) {
+	ws, err := GetsizeFull(t)
+	return int(ws.Rows), int(ws.Cols), err
+}
+
+// Winsize describes the terminal size.
+type Winsize struct {
+	Rows uint16 // ws_row: Number of rows (in cells)
+	Cols uint16 // ws_col: Number of columns (in cells)
+	X    uint16 // ws_xpixel: Width in pixels
+	Y    uint16 // ws_ypixel: Height in pixels
+}
+
+func windowRectCall(ws *Winsize, fd, a2 uintptr) error {
+	_, _, errno := syscall.Syscall(
+		syscall.SYS_IOCTL,
+		fd,
+		a2,
+		uintptr(unsafe.Pointer(ws)),
+	)
+	if errno != 0 {
+		return syscall.Errno(errno)
+	}
+	return nil
+}