added vfctprintf() support

[bart112233]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.89%. Comparing base (d3b9846) to head (24710ad).

Files with missing lines	Patch %	Lines
printf.c	0.00%	4 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff             @@
##            master      #83      +/-   ##
===========================================
- Coverage   100.00%   98.89%   -1.11%     
===========================================
  Files            1        1              
  Lines          359      363       +4     
===========================================
  Hits           359      359              
- Misses           0        4       +4     

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[JakeSays]

I think the name for this function should be fctvprintf to match fctprintf.

[bart112233]

I think the name for this function should be fctvprintf to match fctprintf.

Sure, my mistake

[eyalroz]

This is missing testcase coverage. I'll see if I can take care of that in my fork of the repo.