Question

I’m currently using fgetc() in loop for reading whole file.

But I need to detect EOF in two iterations of this loop.
I know that EOF can’t be returned to stream using ungetc().

What about using

fseek(file, -1, SEEK_CUR)

Is it safe and portable to get before EOF using fseek and read it again?

Thanks.

Answer 1

You can use

fseek(file, 0, SEEK_END)

If you try to read from it, you’ll get your second EOF.

EDIT:

Reading the reference more carefully: “Library implementations are allowed to not meaningfully support SEEK_END (therefore, code using it has no real standard portability).”

I guess your solution is the best one in terms of portability.

Just be careful with fseek (as a note because this is not your case I believe): Using fseek to backtrack