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948e516190
unescape() is used by several tools, in particular printf(1) and
tr(1), which should stop the octal escape at a maximum of 3 digits:
printf(1)
> In addition to the escape sequences shown in XBD 5. File Format
> Notation ('\\', '\a', '\b', '\f', '\n', '\r', '\t', '\v'), "\ddd",
> where ddd is a one, two, or three-digit octal number, shall be
> written as a byte with the numeric value specified by the octal
> number.
tr(1)
> An octal sequence shall consist of a <backslash> followed by the
> longest sequence of one, two, or three-octal-digit characters.
Previously, the maximum was set to 4 (possibly a typo?), which meant
that printf '\0123' printed `S` instead of `<newline>3`.
To check that this doesn't break any other tools using unescape:
- cut: used for -d parameter, escapes are non-standard
- join: used for -t parameter, escapes are non-standard
- nl: used for -s parameter, escapes are non-standard
- paste: used for -d parameter, POSIX specifies \n, \t, \\, and \0,
\0 followed by a digit is unspecified
- sort: used for -t parameter, escapes are non-standard