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#!/usr/bin/env python
"""Displays os.fpathconf values related to terminals."""
# pylint: disable=invalid-name
# Invalid module name "display-sighandlers"
# std imports
import os
import sys
def display_fpathconf():
"""Program entry point."""
if not hasattr(os, "pathconf_names"):
return
disp_values = (
('PC_MAX_CANON', ('Max no. of bytes in a '
'terminal canonical input line.')),
('PC_MAX_INPUT', ('Max no. of bytes for which '
'space is available in a terminal input queue.')),
('PC_PIPE_BUF', ('Max no. of bytes which will '
'be written atomically to a pipe.')),
# to explain in more detail: PC_VDISABLE is the reference character in
# the pairing output for bin/display-terminalinfo.py: if the value
# matches (\xff), then that special control character is disabled, fe:
#
# Index Name Special Character Default Value
# VEOF EOF ^D
# VEOL EOL _POSIX_VDISABLE
#
# regardless, this value is almost always \xff.
('PC_VDISABLE', 'Terminal character disabling value.')
)
fmt = '{name:<13} {value:<10} {description:<11}'
# column header
print(fmt.format(name='name', value='value', description='description'))
print(fmt.replace('<', '-<').format(name='-', value='-', description='-'))
fd = sys.stdin.fileno()
for name, description in disp_values:
key = os.pathconf_names.get(name, None)
if key is None:
value = 'UNDEF'
else:
try:
value = os.fpathconf(fd, name)
if name == 'PC_VDISABLE':
value = fr'\x{value:02x}'
except OSError as err:
value = f'OSErrno {err.errno}'
print(fmt.format(name=name, value=value, description=description))
print()
if __name__ == '__main__':
display_fpathconf()
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