32 lines
814 B
Go
32 lines
814 B
Go
// +build !windows
|
|
|
|
package colog
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
// Use variable indirection for test stubbing
|
|
var isTerminal = isTerminalFunc
|
|
var terminalWidth = terminalWidthFunc
|
|
|
|
// isTerminalFunc returns true if the given file descriptor is a terminal.
|
|
func isTerminalFunc(fd int) bool {
|
|
var termios syscall.Termios
|
|
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
|
|
return err == 0
|
|
}
|
|
|
|
// terminalWidthFunc returns the width in characters of the terminal.
|
|
func terminalWidthFunc(fd int) (width int) {
|
|
var dimensions [4]uint16
|
|
|
|
_, _, errno := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0)
|
|
if errno != 0 {
|
|
return -1
|
|
}
|
|
|
|
return int(dimensions[1])
|
|
}
|