On Mon, 2021-07-26 at 14:21 -0400, Andrew MacLeod via Gcc-patches
wrote:
> Remove lower case characters from the range of to_upper and likewise,
> upper case characters from to_lower.
>
> I looked at also only adding the upper case characters for which there
> is a lower_case character in the range, but it seemed of limited use
> Given some odd usage patterns we emit. . Instead, I simply took the
> incoming range, removed the "from" character set, and added the "to"
> character set. This'll preserve any odd things that are passed into it
> while providing the basic functionality.
>
> Easy enough for someone to enhance if they feel so inclined.
>
> Bootstrapped on x86_64-pc-linux-gnu with no regressions. Pushed.
Awkward question: does this work with character sets where there are
non-letter characters between 'a' and 'z' and between 'A' and 'Z' (e.g.
EBCDIC [1])?
For example toupper('~') should return '~', but '~' is between 'a' and
'z' in EBCDIC; likewise tolower('}') should return '}', but '}' is
between 'A' and 'Z' in EBCDIC.
Dave
[1] https://en.wikipedia.org/wiki/EBCDIC
