# SDL_strlen This works exactly like strlen() but doesn't require access to a C runtime. ## Header File Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h) ## Syntax ```c size_t SDL_strlen(const char *str); ``` ## Function Parameters | | | | | ------------ | ------- | ----------------------------------------------------- | | const char * | **str** | The null-terminated string to read. Must not be NULL. | ## Return Value (size_t) Returns the length (in bytes, excluding the null terminator) of `src`. ## Remarks Counts the bytes in `str`, excluding the null terminator. If you need the length of a UTF-8 string, consider using [SDL_utf8strlen](SDL_utf8strlen)(). ## Thread Safety It is safe to call this function from any thread. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_strnlen](SDL_strnlen) - [SDL_utf8strlen](SDL_utf8strlen) - [SDL_utf8strnlen](SDL_utf8strnlen) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryStdinc](CategoryStdinc)