| """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 map CR to NL on input. |
| mode[IFLAG] &= ~(ICRNL) |
| |
| # 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 |
