tr: add full support for ranges #314
Merged
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tr currently only handles ranges if they are the only construct in
the string containing them (see
contains_single_range
).Add proper handling of ranges: multiple in one string, ranges from
one character type to another (e.g. tr -d '\060-9 A-Z').
Fix handling of octal sequences above \377.
Add validation to ensure equiv (in "[=equiv=]" constructs) is only
one character.
Add validation to ensure ranges are not "backwards" (the ending
character be must greater than or equal to the starting character).
Parse and validate string1 and string2 before reading from stdin.