At 10:11 12.06.00 +0100, John P. Looney (Kate) wrote:
>On Fri, Jun 09, 2000 at 03:45:31PM +0200, Caolan McNamara mentioned:
> > I was always sceptical of qmail and its claims, but looking through
> > his source and his website at http://cr.yp.to I think i might have to eat
> > my own words. Supraparanoid programming, gotta love it.
>>I noticed he doesn't #include *any* system
>headers in most code, and got more scared when I noticed that his
>ideas of Makefiles differ from any other person...
Yeah that'd be because he has given up on just about all the standard
c libraries etc, he doesn't trust them one bit. There is an element of
truth in that where a spec is not nailed down implementers will do
contradictory things, there are little rabbit holes here and there as
to how functions will behave. Take the admittedly nonstandard snprintf,
a) (old glibc and others) The number of characters actually written
to the buffer unless it was truncated in which case it returns -1
b) (new glibc, c9x proposal and FreeBSD methinks) The number of
characters which *would* have been written if all went well and -1
for some sort of inconceivable failure, the correct interpretation.
c) (also seen) return of the desired len INCLUDING the \0.
int i = snprintf(NULL,0,"%s","apple");
a) C9x proposal
i is 5
b) solaris et al
i is -1, i.e. an argument of len 0 is not allowed
I put together a autoconf test for all this nonsense at
and a patch at http://www.csn.ul.ie/~caolan/publink/snprintf/
to upgrade http://www.ijs.si/software/snprintf/ to the desired
behaviour so that you can do something about it if the snprintf
on your system is useless.
Given this sort of stuff its no wonder frustration levels might
send you to reimplement some reliable functions with known side
effects. Personally though I sort of prefer working around them
with autoconf et al.
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