From: Kees Cook
> Sent: 27 August 2020 23:21
...
>
> Agreed. This just makes me cringe. If the API design declares that when
> a show() callback starts, buf has been allocated with PAGE_SIZE bytes,
> then that's how the logic should proceed, and it should be using
> scnprintf...
>
> show(...) {
> size_t remaining = PAGE_SIZE;
>
> ...
> remaining -= scnprintf(buf, remaining, "fmt", var args ...);
> remaining -= scnprintf(buf, remaining, "fmt", var args ...);
> remaining -= scnprintf(buf, remaining, "fmt", var args ...);
Not quite what you had in mind, maybe:
char *end = buf + PAGE_SIZE;
buf += scnprintf(buf, end - buf, ...);
return PAGE_SIZE - (end - buf);
David
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