[ruby-core:99199] [Ruby master Feature#13381] [PATCH] Expose rb_fstring and its family to C extensions

Issue #13381 has been updated by ko1 (Koichi Sasada).


Nobu and I discussed the name, we want to choose `rb_str_pool` terminology.

* `rb_str_pool` prefix
    * `rb_str_pool(VALUE)`
    * `rb_str_pool_buff(const char *ptr, long len)`
    * `rb_str_pool_cstr(const char *ptr)`
    * `rb_enc_str_pool_buff(const char *ptr, long len, rb_encoding *enc)`
    * `rb_enc_str_pool_cstr(const char *ptr, rb_encoding *enc)`

* FYI: `rb_str_new` series:
    * `rb_str_new(const char *ptr, long len)`
    * `rb_str_new_cstr(const char *ptr)`
    * `rb_enc_str_new(const char *ptr, long len, rb_encoding *enc)`
    * `rb_enc_str_new_cstr(const char *ptr, rb_encoding *enc)`

If there is no comments, we will merge it soon.

----------------------------------------
Feature #13381: [PATCH] Expose rb_fstring and its family to C extensions
https://bugs.ruby-lang.org/issues/13381#change-86578

* Author: eagletmt (Kohei Suzuki)
* Status: Assigned
* Priority: Normal
----------------------------------------
https://github.com/ruby/ruby/pull/1559

Currently, C extensions cannot use fstrings. I'd like to use
`rb_fstring_cstr` instead of `rb_str_new_cstr` for static strings in C
extensions to avoid excess allocation.

I think there's several use cases.

- https://github.com/k0kubun/hamlit/blob/v2.8.0/ext/hamlit/hamlit.c#L508-L512
- https://bitbucket.org/ged/ruby-pg/src/e5eb92cca97abc0c6fc168acfad993c2ad314589/ext/pg_connection.c?at=v0.20.0&fileviewer=file-view-default#pg_connection.c-3679
- https://bitbucket.org/ged/ruby-pg/src/e5eb92cca97abc0c6fc168acfad993c2ad314589/ext/pg_copy_coder.c?at=v0.20.0&fileviewer=file-view-default#pg_copy_coder.c-38



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