bug#42904: [PATCH] Non-Unicode frame title crashes Emacs on macOS

[Mattias Engdegård]

17 aug. 2020 kl. 17.55 skrev Eli Zaretskii <eliz@gnu.org>:

> Is something wrong with encode_string_utf_8?  It has arguments that
> allow you to replace invalid bytes into the likes of u+FFFD.  Or did I
> misunderstand the problem you are facing?

No, that's a valid question. I did try that function first, but it had too many 
quirks: doesn't accept a unibyte non-ASCII string, sometimes replaces valid 
characters, doesn't always output UTF-8... It was easier to write a new 
function which encapsulates the common usage case. In addition, the new 
function is short and simple enough that it can easily be verified to be 
correct; encode_string_utf_8 is big and complex.

In addition, it seems likely that the same problem exists elsewhere and it's 
useful to have a function which solves it right away.