vim-patch:partial:9.2.0126: String handling can be improved (#38214)

Problem:  String handling can be improved
Solution: Pass string length where it is known to avoid strlen() calls,
          do a few minor refactors (John Marriott).

This commit changes some calls to function `set_vim_var_string()` to pass
the string length where it is known or can be easily calculated.

In addition:
In `evalvars.c`:
  * In function `set_reg_var()` turn variable `regname` into a C string
    because that is how it used.
  * Small cosmetics.
In `option.c`:
  * Slightly refactor function `apply_optionset_autocmd()` to move some
    variables closer to where they are used.
In `getchar.c`:
  * Slightly refactor function `do_key_input_pre()`:
    -> change call to `dict_add_string()` to `dict_add_string_len()` and
       pass it the length of `buf`.
    -> only call `get_vim_var_string()` once.
In `message.c`:
  * Use a `string_T` to store local variable `p`.
In `normal.c`:
  * Move some variables closer to where they are used.

closes: vim/vim#19618

https://github.com/vim/vim/commit/727f6e2686fb1d06b9591e6de689763a479cc664

Co-authored-by: John Marriott <basilisk@internode.on.net>

0 files changed, 0 insertions, 0 deletions