On 2024-09-18 04:45, Eli Zaretskii wrote:
> what's the
> problem with using c_isspace (and what do you mean by "multibyte
> space"

Using c_isspace would be OK, in that it'd handle most practical 
examples. I wrote the fancier version to handle prompts that end in 
non-ASCII spaces, e.g., (yes-or-no-p "Delete all files? ") where the 
last character is actually U+00A0 NO-BREAK_SPACE instead of U+0020 
SPACE, so its UTF-8 encoding is multiple bytes. If it's not important to 
handle such cases we could just use c_isspace.


> You are testing characters for whitespace syntax, which is AFAIU
> subject to buffer-local syntax tables.

Thanks, I didn't think of that. How about the attached patch? It is an 
alternative to just using c_isspace.