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"""Terminal utilities.""" # Author: Steen Lumholt. from termios import * __all__ = ["cfmakeraw", "cfmakecbreak", "setraw", "setcbreak"] # Indices for termios list. IFLAG = 0 OFLAG = 1 CFLAG = 2 LFLAG = 3 ISPEED = 4 OSPEED = 5 CC = 6 def cfmakeraw(mode): """Make termios mode raw.""" # Clear all POSIX.1-2017 input mode flags. # See chapter 11 "General Terminal Interface" # of POSIX.1-2017 Base Definitions. mode[IFLAG] &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF) # Do not post-process output. mode[OFLAG] &= ~OPOST # Disable parity generation and detection; clear character size mask; # let character size be 8 bits. mode[CFLAG] &= ~(PARENB | CSIZE) mode[CFLAG] |= CS8 # Clear all POSIX.1-2017 local mode flags. mode[LFLAG] &= ~(ECHO | ECHOE | ECHOK | ECHONL | ICANON | IEXTEN | ISIG | NOFLSH | TOSTOP) # POSIX.1-2017, 11.1.7 Non-Canonical Mode Input Processing, # Case B: MIN>0, TIME=0 # A pending read shall block until MIN (here 1) bytes are received, # or a signal is received. mode[CC] = list(mode[CC]) mode[CC][VMIN] = 1 mode[CC][VTIME] = 0 def cfmakecbreak(mode): """Make termios mode cbreak.""" # Do not echo characters; disable canonical input. mode[LFLAG] &= ~(ECHO | ICANON) # POSIX.1-2017, 11.1.7 Non-Canonical Mode Input Processing, # Case B: MIN>0, TIME=0 # A pending read shall block until MIN (here 1) bytes are received, # or a signal is received. mode[CC] = list(mode[CC]) mode[CC][VMIN] = 1 mode[CC][VTIME] = 0 def setraw(fd, when=TCSAFLUSH): """Put terminal into raw mode.""" mode = tcgetattr(fd) new = list(mode) cfmakeraw(new) tcsetattr(fd, when, new) return mode def setcbreak(fd, when=TCSAFLUSH): """Put terminal into cbreak mode.""" mode = tcgetattr(fd) new = list(mode) cfmakecbreak(new) tcsetattr(fd, when, new) return mode
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