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Thanks to all for the suggestions and apologies for posting c**p code. I didn't want to post hundreds of lines of real code and came up with a buggy example :-(

The alignment problem looks to be...

Sorry - didn't make myself clear enough.

Assume you can't change the code I posted, but I need a pointer to the place in the buffer where the stored struct starts.

Is this legal ??

ptr =...

What's the correct way to do pointer arithmetic in this example ?

Say I store a struct in a buffer at some offset and then want to get a pointer to it. e.g.




int offset;
sometype...

Yeah, fseek() returns 0 (zero) for success and -1 on error.

You *really* should get into the habit of checking return values. Something like:




if (fseek(fp, 0L, SEEK_SET) != 0) {
//...

If you're trying to read back what you've just written, you'll have to "rewind" the file pointer first of all.

After the fprintf(), the file pointer will be positioned at the end-of-file - just...