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#!/usr/bin/env python
"""Displays os.fpathconf values related to terminals. """
from __future__ import print_function
import sys
import os
def display_fpathconf():
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.')),
('PC_VDISABLE', 'Terminal character disabling value.')
)
FMT = '{name:<13} {value:<5} {description}'
# column header
print(FMT.format(name='name', value='value', description='description'))
print(FMT.format(name=('-' * 13), value=('-' * 5), description=('-' * 11)))
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)
except OSError as err:
value = 'OSErrno {0.errno}'.format(err)
if name == 'PC_VDISABLE':
value = hex(value)
print(FMT.format(name=name, value=value, description=description))
print()
if __name__ == '__main__':
display_fpathconf()
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