Man page - sdl_tellio(3)

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SDL_TellIO - Determine the current read/write offset in an SDL_IOStream
data stream.

Defined in SDL3/SDL_iostream.h

#include "SDL3/SDL.h"

Sint64 SDL_TellIO(SDL_IOStream *context);

SDL_TellIO
is actually a wrapper function that calls the

SDL_IOStream seek method, with an offset of 0 bytes from SDL_IO_SEEK_CUR , to simplify application development.

context

an SDL_IOStream
data stream object from which to get the current offset.

( Sint64 ) Returns the current offset in the stream, or -1 if the information can not be determined.

This function is not thread safe.

This function is available since SDL 3.2.0.