SDL_ReadIO - Read from a data source.

       This function is available since SDL 3.2.0.

       This  function reads up size bytes from the data source to the area pointed at by ptr . This function may
       read less bytes than requested.

       This function will return zero when the data stream is completely read, and

       SDL_GetIOStatus () will return

       SDL_IO_STATUS_EOF . If zero is returned and the stream is not at EOF, SDL_GetIOStatus ()  will  return  a
       different error value and SDL_GetError () will offer a human-readable message.

context
              a pointer to an SDL_IOStream
               structure.

       ptr    a pointer to a buffer to read data into.

       size   the number of bytes to read from the data source.

       Defined in SDL3/SDL_iostream.h

       SDL_ReadIO - Read from a data source.

       Returns  the  number  of  bytes read, or 0 on end of file or other failure; call SDL_GetError () for more
       information.

•(3), SDL_WriteIO(3), •(3), SDL_GetIOStatus(3)

Simple Directmedia Layer                           SDL 3.2.10                                      SDL_ReadIO(3)

#include"SDL3/SDL.h"size_tSDL_ReadIO(SDL_IOStream*context,void*ptr,size_tsize);

       This function is not thread safe.