SDL_utf8strnlen - Count the number of codepoints in a UTF-8 string, up to n bytes.

       This function is available since SDL 3.2.0.

       Counts the _codepoints_, not _bytes_, in str, excluding the null terminator.

       If you need to count the bytes in a string instead, consider using SDL_strnlen().

       The  counting  stops  at bytes bytes (not codepoints!). This seems counterintuitive, but makes it easy to
       express the total size of the string's buffer.

       Since this handles Unicode, it expects the strings to be well-formed  UTF-8  and  not  a  null-terminated
       string  of  arbitrary  bytes.  Bytes  that  are  not  valid UTF-8 are treated as Unicode character U+FFFD
       (REPLACEMENT CHARACTER), so a malformed or incomplete UTF-8 sequence might increase the count by  several
       replacement characters.

str    The null-terminated UTF-8 string to read. Must not be NULL.

       bytes  The maximum amount of bytes to count.

       SDL_utf8strnlen - Count the number of codepoints in a UTF-8 string, up to n bytes.

       Returns The length (in codepoints, excluding the null terminator) of src but never more than maxlen.

SDL_utf8strlen(3), SDL_strnlen(3)

Simple Directmedia Layer                           SDL 3.2.20                                 SDL_utf8strnlen(3)

#include<SDL3/SDL_stdinc.h>size_tSDL_utf8strnlen(constchar*str,size_tbytes);

       It is safe to call this function from any thread.