Function stdio_stream_read_init

examples/stdlib.c:3182–3201

}

static int stdio_stream_read_init(FILE *stream)
{
    if (!(stream->flags & STDIO_FLAG_READ) ||
         (stream->flags & STDIO_FLAG_ERROR) ||
         (stream->flags & STDIO_FLAG_EOF))
    {
        errno = EINVAL;
        return EOF;
    }
    if (stream->flags & STDIO_FLAG_WRITING)
        fflush_unlocked(stream);
    stream->flags |= STDIO_FLAG_READING;
    if (!(stream->flags & STDIO_FLAG_INITED) &&
            stdio_stream_buf_init(stream) < 0)
        return EOF;
    if (stream->read_ptr >= stream->read_end &&
            stdio_stream_read(stream) < 0)
        return EOF;
    return 0;
}

static int stdio_stream_write_init(FILE *stream)
{