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Date: Sat, 1 Dec 2018 19:02:02 +1100
From: Xan Phung <xan.phung@...il.com>
To: musl@...ts.openwall.com
Subject: Re: stdio glitch & questions
>
> So anyway, I think there are probably some good reasons to do the
> merging in __fwritex rather than in the __stdio_write backend. But it
> should be a lot simpler than what you initially proposed.
>
> Rich
>
Thanks for your feedback! In interest of keeping the proposal as simple as
possible, I've gone with just one extra line of code (see below). It
simply does copying for i <= 8.
It works on my initial testing and I'm getting zero lengths in the 2nd
writev iovec (as expected), but I'll test it more in coming week.
size_t __fwritex(const unsigned char *restrict s, size_t l, FILE *restrict
f)
{
size_t i=0;
if (!f->wend && __towrite(f)) return 0;
if (l > f->wend - f->wpos) return f->write(f, s, l);
if (f->lbf >= 0) {
/* Match /^(.*\n|)/ */
for (i=l; i && s[i-1] != '\n'; i--);
if (i) {
*if (i <= 8) for (; i; i--, l--) *(f->wpos)++ = *s++;*
size_t n = f->write(f, s, i);
if (*!f->wpos ||* n < i) return n;
l -= i;
s += i;
}
}
memcpy(f->wpos, s, l);
f->wpos += l;
return l+i;
}
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