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