fold: infinite loop for -bs

[mknos]

• For some input files, fold would get stuck in a loop printing "\n when run with -b and -s options
• In this case fold_file_byte() is called instead of fold_file()
• The regular expressions $soft and $hard are expected to modify the length of $_ if they match
• The while-loop controlled by $_ length never terminated if neither regex matched
• Adding a condition to break out of the loop for no-match prevents the infinite loop

%perl fold -b -s ed  | head -n 2000 | less
...
00000c80: 676c 6520 6c65 7474 6572 2063 6f6d 6d61  gle letter comma
00000c90: 6e64 2065 6e74 6572 6564 2062 7920 7573  nd entered by us
00000ca0: 6572 0a6d 7920 2463 6f6d 6d61 6e64 7375  er.my $commandsu
00000cb0: 663b 2020 2020 2020 2020 2020 2020 2020  f;              
00000cc0: 2020 2023 2073 696e 676c 6520 6c65 7474     # single lett
00000cd0: 6572 206d 6f64 6966 6965 7220 6f66 2063  er modifier of c
00000ce0: 6f6d 6d61 6e64 0a0a 0a0a 0a0a 0a0a 0a0a  ommand..........
00000cf0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d00: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d10: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d20: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d30: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d40: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d50: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d60: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d70: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d80: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000d90: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000da0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000db0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000dc0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000dd0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................
00000de0: 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a 0a0a  ................

[coveralls]

Pull Request Test Coverage Report for Build 11773015541

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 73.069%

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Totals
Change from base Build 11772357361:	-0.7%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: fix possbile infinite loop in -bs