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65 lines
1.2 KiB
Go
65 lines
1.2 KiB
Go
// +build !windows
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package pty
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import (
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"os"
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"syscall"
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"unsafe"
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)
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// Getsize returns the number of rows (lines) and cols (positions
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// in each line) in terminal t.
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func Getsize(t *os.File) (rows, cols int, err error) {
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var ws winsize
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err = getwindowrect(&ws, t.Fd())
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return int(ws.ws_row), int(ws.ws_col), err
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}
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// Setsize sets the number of rows (lines) and cols (positions
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// in each line) in terminal t. Both rows and cols have to be
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// positive integers.
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func Setsize(t *os.File, rows, cols int) error {
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ws := winsize{
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ws_col: uint16(cols),
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ws_row: uint16(rows),
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ws_xpixel: uint16(0), // not used
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ws_ypixel: uint16(0), // not used
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}
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return setwindowrect(&ws, t.Fd())
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}
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type winsize struct {
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ws_row uint16
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ws_col uint16
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ws_xpixel uint16
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ws_ypixel uint16
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}
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func getwindowrect(ws *winsize, fd uintptr) error {
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_, _, errno := syscall.Syscall(
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syscall.SYS_IOCTL,
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fd,
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syscall.TIOCGWINSZ,
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uintptr(unsafe.Pointer(ws)),
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)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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func setwindowrect(ws *winsize, fd uintptr) error {
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_, _, errno := syscall.Syscall(
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syscall.SYS_IOCTL,
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fd,
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syscall.TIOCSWINSZ,
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uintptr(unsafe.Pointer(ws)),
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)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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