SDL_wcsnlen - This works exactly like wcsnlen() but doesn't require access to a C runtime.

       This function is available since SDL 3.2.0.

       Counts up to a maximum of maxlen wchar_t values in wstr , excluding the null terminator.

       Like SDL_strnlen
        only  counts bytes and not codepoints in a UTF-8 string, this counts wchar_t values in a string, even if
       the string's encoding is of variable width, like UTF-16.

       Also be aware that wchar_t is different sizes on different platforms (4 bytes on  Linux,  2  on  Windows,
       etc).

       Also, maxlen is a count of wide characters, not bytes!

wstr   The null-terminated wide string to read. Must not be NULL.

       maxlen The maximum amount of wide characters to count.

       Defined in SDL3/SDL_stdinc.h

       SDL_wcsnlen - This works exactly like wcsnlen() but doesn't require access to a C runtime.

       Returns the length (in wide characters, excluding the null terminator) of wstr but never more than maxlen
       .

•(3), SDL_wcslen(3), •(3), SDL_utf8strlen(3), •(3), SDL_utf8strnlen(3)

Simple Directmedia Layer                           SDL 3.2.10                                     SDL_wcsnlen(3)

#include"SDL3/SDL.h"size_tSDL_wcsnlen(constwchar_t*wstr,size_tmaxlen);

       It is safe to call this function from any thread.