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# usually behave like "head -n 1"
a
ret: 0
# never consume more than one line
1
2
ret: 0
# add a newline
abc
ret: 1
# print one newline on empty input
ret: 1
# add a newline, return 1 when EOF
xyz
ret: 1
# print one newline on empty input, return 1 when EOF
ret: 1
# large line of zero bytes
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00100000 0a |.|
00100001
ret: 0
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