Library import 16 (#2433)

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1 files changed, 73 insertions, 0 deletions

diff --git a/contrib/tools/python3/Lib/tty.py b/contrib/tools/python3/Lib/tty.py
new file mode 100644
index 0000000000..5a49e04004
--- /dev/null
+++ b/contrib/tools/python3/Lib/tty.py
@@ -0,0 +1,73 @@
+"""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