[OpenAFS-devel] dumpstuff.c: ReadString: ?

[Peter Somogyi]

Hi,

I'm analyzing volser/dumpstuff.c.
I can't understand the second part of this function:

static void
ReadString(register struct iod *iodp, register char *to, register int maxa)
{
    register int c;
    while (maxa--) {
	if ((*to++ = iod_getc(iodp)) == 0)
	    break;
    }
    if (to[-1]) {
	while ((c = iod_getc(iodp)) && c != EOF);
	to[-1] = 0;
    }
}

What I don't really understand, what's that to[-1] stuff there?
(Anyway: is it correct in C having array index of -1? I haven't seen such before...)
If anybody knows the answer, please tell me.

-- 
Peter Somogyi
Software Developer, Gamax Ltd.
1114 Budapest, Bartok B. u 15/d
Tel.: +36-1-381-0544
e-mail: psomogyi@gamax.hu