Dominique Pellé wrote:
> Attached patch improves coverage tests of function printf().
Thanks, I'll include it.
> While adding tests, I noticed a few things possibly wrong:
>
> :echo printf("%f", sqrt(-1.0))
> -nan
>
> I would have expected it to print "nan" instead of "-nan"
> as in the example given in :help sqrt(). nan should not
> be signed. I'm curious what it prints on other systems.
>
> Another bug: The following 2 commands correctly
> prints signed infinity:
>
> :echo 1.0/0.0
> inf
> :echo -1.0/0.0
> -inf
>
> But when using printf(), the sign is gone. The sign
> is significant for infinity, so the output of printf()
> looks wrong:
>
> :echo printf('%f', 1.0/0.0)
> inf
> :echo printf('%f', -1.0/0.0)
> inf
>
> I expected instead inf and -inf.
Perhaps you can fix this.
> I also noticed that a few things are not documented
> in :help printf() but which appear to do something or
> are ignored. I did not test those as they are undocumented:
>
> Is there any used for %p in vim function printf()?
>
> :echo printf('%p', 'abc')
> 0x22c96e0
It's a pointer. Not useful, it's there because of where the code came
from. We could perhaps remove it, I can't think of a way to use it.
> modifiers "%hd", "%ld", "%lld" are also undocumented:
>
> :echo printf('%hx', 0x12345678)
> 5678
> :echo printf('%x', 0x12345678)
> 12345678
> :echo printf('%lx', 0x12345678)
> 12345678
> :echo printf('%llx', 0x12345678)
> 12345678
These are not very useful. I'll add some documentation.
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