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#!/usr/bin/env python3
"""
Reads a script with a shebang from standard input and executes it.
"""
import os
import subprocess
import sys
# We are not using sys.stdin because it does internal buffering:
# sys.stdin.read(2) can read up to 8192 bytes, we however don't
# want that because we want everything after the shebang to be
# read by the subprocess.
if os.read(0, 2) != b'#!':
sys.exit('expected #! shebang')
line = b''
while True:
byte = os.read(0, 1)
if byte == b'':
sys.exit('unexpected EOF')
if byte == b'\n':
break
line += byte
args = line.strip().split(maxsplit=1)
args.append('/dev/stdin')
subprocess.run(args)
# the subprocess inherits the standard input file
# descriptor and interprets the remaining input
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