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