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gh-85984: New additions and improvements to the tty library.#101832

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gpshead merged 7 commits intopython:mainfrom8vasu:tty_new_additions
May 19, 2023
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New additions to the tty library. Functions added: cfmakeraw(), and c…
…fmakecbreak(). Thefunctions setcbreak() and setraw() now return original termios to save an extra tcgetattr() call.Signed-off-by: Soumendra Ganguly <soumendraganguly@gmail.com>
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@8vasu
8vasu committedFeb 11, 2023
commit33f1871b8b8b567f3d2bfb7f216a63491426eade
18 changes: 16 additions & 2 deletionsDoc/library/tty.rst
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Expand Up@@ -20,18 +20,32 @@ Because it requires the :mod:`termios` module, it will work only on Unix.
The :mod:`tty` module defines the following functions:


.. function:: cfmakeraw(mode)

Convert the tty attribute list *mode*, which is a list like the one returned
by :func:`termios.tcgetattr`, to that of a tty in raw mode.


.. function:: cfmakecbreak(mode)

Convert the tty attribute list *mode*, which is a list like the one returned
by :func:`termios.tcgetattr`, to that of a tty in cbreak mode.


.. function:: setraw(fd, when=termios.TCSAFLUSH)

Change the mode of the file descriptor *fd* to raw. If *when* is omitted, it
defaults to :const:`termios.TCSAFLUSH`, and is passed to
:func:`termios.tcsetattr`.
:func:`termios.tcsetattr`. The return value of :func:`termios.tcgetattr`
is saved before setting *fd* to raw mode; this value is returned.


.. function:: setcbreak(fd, when=termios.TCSAFLUSH)

Change the mode of file descriptor *fd* to cbreak. If *when* is omitted, it
defaults to :const:`termios.TCSAFLUSH`, and is passed to
:func:`termios.tcsetattr`.
:func:`termios.tcsetattr`. The return value of :func:`termios.tcgetattr`
is saved before setting *fd* to cbreak mode; this value is returned.


.. seealso::
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70 changes: 54 additions & 16 deletionsLib/tty.py
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Expand Up@@ -4,9 +4,9 @@

from termios import *

__all__ = ["setraw", "setcbreak"]
__all__ = ["cfmakeraw", "cfmakecbreak", "setraw", "setcbreak"]

#Indexes for termios list.
#Indices for termios list.
IFLAG = 0
OFLAG = 1
CFLAG = 2
Expand All@@ -15,22 +15,60 @@
OSPEED = 5
CC = 6

def setraw(fd, when=TCSAFLUSH):
"""Put terminal into a raw mode."""
mode = tcgetattr(fd)
mode[IFLAG] = mode[IFLAG] & ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON)
mode[OFLAG] = mode[OFLAG] & ~(OPOST)
mode[CFLAG] = mode[CFLAG] & ~(CSIZE | PARENB)
mode[CFLAG] = mode[CFLAG] | CS8
mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON | IEXTEN | ISIG)
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][VMIN] = 1
mode[CC][VTIME] = 0
tcsetattr(fd, when, mode)

def setcbreak(fd, when=TCSAFLUSH):
"""Put terminal into a cbreak mode."""
mode = tcgetattr(fd)
mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON)
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][VMIN] = 1
mode[CC][VTIME] = 0
tcsetattr(fd, when, mode)

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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