Is it possible to implement multiple input logic ports with circuitikz?

TikZ uses \pgfutil@g@addto@macro to create anchors, which are presumably saved as global macros with some undocumented naming convention. The key seems to be writing a macro (\pgf@circ@logicport@input) which will locate the anchors using only \savedanchors and one input (\pgfmathcounter).

Another problem is that the left side of various ports are curved, so one needs to be able to compute the edge location for a given y value. To simplify these computations, I used arcs instead of \pgfpathcurveto. I replaced the outer curves as well. The new shapes are not perfect matches, but they are very close. To define the left side arcs I added two new parameters, angle and inner. angle is the starting angle, and inner is the distance from the outer edge to the middle of the curve. The x and y radii are computed using \pgfmath. (Eventually I ran out of length registers and had to use macros.) OTOH, all the aaa through ddd parameters are no longer used.

As is custom for Circuitikz, one can set the number of inputs (inputs) for each type of gate using \ctikzset. I added a node parameter (number inputs) which can be set on a node by node basis. Also, this number can never be less than 2 or greater than 16.

I added origin parameter. Setting origin=0 puts the center anchor in the center of the node. The default setting is 0.8 for backward compatibility. I fixed the text anchor so that one can write part numbers etc. inside the port (if it fits).

\documentclass{standalone}
\usepackage{circuitikz}

\ctikzset{tripoles/american and port/origin/.initial=0.8}
\ctikzset{tripoles/american and port/inputs/.initial=2}

\ctikzset{tripoles/american nand port/origin/.initial=0.8}
\ctikzset{tripoles/american nand port/inputs/.initial=2}

\ctikzset{tripoles/american nor port/origin/.initial=0.8}
\ctikzset{tripoles/american nor port/inputs/.initial=2}
\ctikzset{tripoles/american nor port/angle/.initial=70}
\ctikzset{tripoles/american nor port/inner/.initial=0.3}

\ctikzset{tripoles/american or port/origin/.initial=0.8}
\ctikzset{tripoles/american or port/inputs/.initial=2}
\ctikzset{tripoles/american or port/angle/.initial=70}
\ctikzset{tripoles/american or port/inner/.initial=0.3}

\ctikzset{tripoles/american xor port/origin/.initial=0.8}
\ctikzset{tripoles/american xor port/inputs/.initial=2}
\ctikzset{tripoles/american xor port/angle/.initial=70}
\ctikzset{tripoles/american xor port/inner/.initial=0.3}

\ctikzset{tripoles/american xnor port/origin/.initial=0.8}
\ctikzset{tripoles/american xnor port/inputs/.initial=2}
\ctikzset{tripoles/american xnor port/angle/.initial=70}
\ctikzset{tripoles/american xnor port/inner/.initial=0.3}

\pgfkeys{/tikz/number inputs/.initial=0}
\pgfkeys{/tikz/number inputs/.default=0}

\makeatletter
\newcount{\pgf@circ@res@count}% reserve global register

\newcommand{\pgf@circ@logicport@input}[1]% #1 = \pgfmathcounter
{%
  \pgfextracty{\pgf@circ@res@up}{\northeast}%
  \step
  \pgf@circ@res@step=\dimexpr 2\pgf@y -2\pgf@circ@res@up\relax
  \advance\pgf@y by -#1\pgf@circ@res@step\relax
}%
\long\def\pgfcircdeclarelogicport#1#2{%
    \pgfdeclareshape{american #1 port}%
    {%
    \savedmacro\resize{% automatic
      \pgf@circ@res@up = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \pgf@circ@res@up = .5\pgf@circ@res@up
      \pgf@circ@res@down = -\pgf@circ@res@up
      \pgf@circ@res@right = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/width}\pgf@circ@Rlen
      \pgf@circ@res@right = .5\pgf@circ@res@right
      \pgf@circ@res@left = -\pgf@circ@res@right
    }%
    \savedmacro\inputs{% get number of inputs
      \pgf@circ@res@count=\pgfkeysvalueof{/tikz/number inputs}\relax%
      \ifnum\pgf@circ@res@count=0
        \pgf@circ@res@count=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/inputs}\relax%
      \fi
      \ifnum\pgf@circ@res@count<2 \pgf@circ@res@count=2\fi
      \ifnum\pgf@circ@res@count>16 \pgf@circ@res@count=16\fi
      \def\inputs{\the\pgf@circ@res@count}%
    }%
    \savedanchor\step{% 1/2 gap at edges
      \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \divide\pgf@circ@res@step by \pgf@circ@res@count
      \pgfpoint{\pgf@circ@res@left}{\dimexpr\pgf@circ@res@up+0.5\pgf@circ@res@step}%
    }%
      \savedanchor\northeast{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
    \savedanchor\southwest{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
    \savedanchor\left{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@left}{0pt}}
    \savedanchor\right{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@right}{0pt}}
    \savedanchor\origin{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/origin}\pgf@circ@res@right}{0pt}}

    \anchor{center}{\origin}% for backwards compatibility
    \anchor{text}{\pgfpoint{-.5\wd\pgfnodeparttextbox}{\dimexpr.5\dp\pgfnodeparttextbox-.5\ht\pgfnodeparttextbox}}

% create input anchors
    \expandafter\pgfutil@g@addto@macro\csname pgf@sh@s@american #1 port\endcsname{%
      \pgfmathloop%
      \ifnum\pgfmathcounter>\pgf@circ@res@count%
      \else%
        %\pgfutil@ifundefined{pgf@anchor@american #1 port@in \pgfmathcounter}{%
          \expandafter\xdef\csname pgf@anchor@american #1 port@in \pgfmathcounter\endcsname{%
            \noexpand\pgf@circ@logicport@input{\pgfmathcounter}% defined above
          }%
        %}{}%
      \repeatpgfmathloop%
    }

      \anchor{out}{\pgfpoint{\pgf@circ@res@right}{0pt}}

    \anchor{left}{\left}% edges of component mius leads
    \anchor{right}{\right}

    \anchor{north east}{\northeast}% see \Compass macro
    \anchor{south west}{\southwest}
    \anchor{north}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfpoint{0cm}{\pgf@circ@res@up}}
    \anchor{north west}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfextractx{\pgf@circ@res@left}{\southwest}%
      \pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
    \anchor{west}{\pgfextractx{\pgf@circ@res@left}{\sosuthwest}%
      \pgfpoint{\pgf@circ@res@left}{0cm}}
    \anchor{south}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfpoint{0cm}{\pgf@circ@res@down}}
    \anchor{south east}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
    \anchor{east}{\pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{0cm}}

      \backgroundpath{          
            \pgfsetcolor{\pgfkeysvalueof{/tikz/circuitikz/color}}   
            #2
      }
    }
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% and %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{and}{
  \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@up}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{-2\pgf@circ@res@other and \pgf@circ@res@up}
  \pgfpathclose
    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nand %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{nand}{
    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/circle width}\pgf@circ@res@right
    \pgf@circ@res@other = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax

    \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@up}}
    \pgfpathlineto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{nor}{
  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up /sin(\pgf@circ@math@angle)}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% or %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{or}{
    \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up /sin(\pgf@circ@math@angle)}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{xor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up / sin(\pgf@circ@math@angle))}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpathclose

  \pgfmathsetlength{\pgf@circ@res@temp}{(\pgf@circ@math@yradiusA)*sin(\pgf@circ@math@angle)}%

  \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other-\pgf@circ@math@distance}{\pgf@circ@res@temp}}% first arc
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradiusA and \pgf@circ@math@yradiusA}%

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xnor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{xnor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xnor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up / sin(\pgf@circ@math@angle))}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/angle}}%
  \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@left
  \pgfmathsetlength{\pgf@circ@res@temp}{(\pgf@circ@math@yradiusA)*sin(\pgf@circ@math@angle)}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other-\pgf@circ@math@distance}{\pgf@circ@res@temp}}% first arc
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradiusA and \pgf@circ@math@yradiusA}%

    \pgfusepath{draw}
}
\makeatother
\begin{document}
\begin{circuitikz}
\node[american and port] at (0,0) {};
\node[american nand port,number inputs=3] at (0,-2) {};
\node[american or port,number inputs=4] at (2,0) {};
\node[american nor port,number inputs=5] at (2,-2) {};
\node[american xor port,number inputs=6] at (4,0) {};
\node[american xnor port,number inputs=7] at (4,-2) {};
\end{circuitikz}
\end{document}

demo

Here is my version of the European gates. Due to size, I am entering this as a separate answer. There is some duplication with the American answer: \pgf@circ@res@count, \pgf@circ@logicport@input and the pgfkey /tikz/number inputs.

\documentclass{standalone}
\tracingmacros=1
\usepackage{circuitikz}

\ctikzset{tripoles/european and port/origin/.initial=0.8}
\ctikzset{tripoles/european and port/inputs/.initial=2}

\ctikzset{tripoles/european nand port/origin/.initial=0.8}
\ctikzset{tripoles/european nand port/inputs/.initial=2}

\ctikzset{tripoles/european or port/origin/.initial=0.8}
\ctikzset{tripoles/european or port/inputs/.initial=2}

\ctikzset{tripoles/european nor port/origin/.initial=0.8}
\ctikzset{tripoles/european nor port/inputs/.initial=2}

\ctikzset{tripoles/european xor port/origin/.initial=0.8}
\ctikzset{tripoles/european xor port/inputs/.initial=2}

\ctikzset{tripoles/european xnor port/origin/.initial=0.8}
\ctikzset{tripoles/european xnor port/inputs/.initial=2}

\ctikzset{tripoles/european not port/origin/.initial=0.8}
\ctikzset{tripoles/european not port/inputs/.initial=1}

\pgfkeys{/tikz/number inputs/.initial=0}
\pgfkeys{/tikz/number inputs/.default=0}

\makeatletter
\newcount{\pgf@circ@res@count}% reserve global register

\newcommand{\pgf@circ@logicport@input}[1]% #1 = \pgfmathcounter
{%
  \pgfextracty{\pgf@circ@res@up}{\northeast}%
  \step
  \pgf@circ@res@step=\dimexpr 2\pgf@y -2\pgf@circ@res@up\relax
  \advance\pgf@y by -#1\pgf@circ@res@step\relax
}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% #1 - name
% #2 - text inside
% #3 - number of inputs
% #4 = is it a not?

\long\def\pgfcircdeclareeurologicport#1#2#3#4{
    \pgfdeclareshape{european #1 port}
    {
    \savedmacro\resize{% automatic
      \pgf@circ@res@up = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/height}\pgf@circ@Rlen
      \pgf@circ@res@up = .5\pgf@circ@res@up
      \pgf@circ@res@down = -\pgf@circ@res@up
      \pgf@circ@res@right = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/width}\pgf@circ@Rlen
      \pgf@circ@res@right = .5\pgf@circ@res@right
      \pgf@circ@res@left = -\pgf@circ@res@right
    }%
    \savedmacro\inputs{% get number of inputs
      \pgf@circ@res@count=\pgfkeysvalueof{/tikz/number inputs}\relax%
      \ifnum\pgf@circ@res@count=0
        \pgf@circ@res@count=\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/inputs}\relax%
      \fi
      \ifnum\pgf@circ@res@count<2 \pgf@circ@res@count=2\fi
      \ifnum\pgf@circ@res@count>16 \pgf@circ@res@count=16\fi
      \def\inputs{\the\pgf@circ@res@count}%
    }%
    \savedanchor\step{% 1/2 gap at edges
      \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/height}\pgf@circ@Rlen
      \divide\pgf@circ@res@step by #3
      \pgfpoint{\pgf@circ@res@left}{\dimexpr\pgf@circ@res@up+0.5\pgf@circ@res@step}%
    }%
    \savedanchor\northeast{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}%
    \savedanchor\southwest{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}%
    \savedanchor\left{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}{0pt}}%
    \savedanchor\right{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{0pt}}%
    \savedanchor\origin{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/origin}\pgf@circ@res@right}{0pt}}%

    \anchor{center}{\origin}% for backwards compatibility
    % the text anchor overlaps the logic symbol
    \anchor{text}{\pgfpoint{-.5\wd\pgfnodeparttextbox}{\dimexpr.5\dp\pgfnodeparttextbox-.5\ht\pgfnodeparttextbox}}%
    % create input anchors
    \ifnum#3=1\relax
      \anchor{in}{\pgfpoint{\pgf@circ@res@left}{0pt}}% or \step
    \else 
      \expandafter\pgfutil@g@addto@macro\csname pgf@sh@s@european #1 port\endcsname{%
      \pgfmathloop%
        \ifnum\pgfmathcounter>#3%
        \else%
          %\pgfutil@ifundefined{pgf@anchor@european #1 port@in \pgfmathcounter}{% redundant
            \expandafter\xdef\csname pgf@anchor@european #1 port@in \pgfmathcounter\endcsname{%
              \noexpand\pgf@circ@logicport@input{\pgfmathcounter}% defined above
            }%
          %}{}%
        \repeatpgfmathloop%
      }
    \fi
    \anchor{out}{\pgfpoint{\pgf@circ@res@right}{0pt}}

    \anchor{left}{\left}% edges of component minus leads
    \anchor{right}{\right}

    \anchor{north east}{\northeast}% see \Compass macro
    \anchor{south west}{\southwest}
    \anchor{north}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfpoint{0cm}{\pgf@circ@res@up}}
    \anchor{north west}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfextractx{\pgf@circ@res@left}{\southwest}%
      \pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
    \anchor{west}{\pgfextractx{\pgf@circ@res@left}{\sosuthwest}%
      \pgfpoint{\pgf@circ@res@left}{0cm}}
    \anchor{south}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfpoint{0cm}{\pgf@circ@res@down}}
    \anchor{south east}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
    \anchor{east}{\pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{0cm}}

      \backgroundpath{          
            \pgfsetcolor{\pgfkeysvalueof{/tikz/circuitikz/color}}   
            \ifnum#3=1\relax
        \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{0pt}}%
        \pgfpathlineto{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}{0pt}}%
      \else
        \pgfextracty{\pgf@circ@res@temp}{\step}%
        \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
        %\pgf@circ@res@count = #3\relax% redundant
        \loop\ifnum\pgf@circ@res@count>0
          \advance\pgf@circ@res@temp by -\pgf@circ@res@step
            \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
          \pgfpathlineto{\pgfpoint
              {\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}
              {\pgf@circ@res@temp}}
          \advance\pgf@circ@res@count by -1
        \repeat
            \fi
            %
            \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
            \pgfpathlineto{%
                \pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{0pt}}
            %
            \edef\pgf@temp{not}
            \edef\pgf@circ@temp{#4}
            \ifx\pgf@temp\pgf@circ@temp % is a not
                \pgfpathmoveto{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/not width}\pgf@circ@res@right}{0pt}}
                \pgfpathlineto{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}%
          {\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/not height}\pgf@circ@res@up}}
            \fi
            %
            \pgfusepath{draw}
            %
            \pgfpathmoveto{\pgfpointorigin}
            \pgftext{#2}
            %
            \pgfsetlinewidth{2\pgflinewidth}
            \pgfpathrectanglecorners
                {\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}{\pgf@circ@res@up}}
                {\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{\pgf@circ@res@down}}
            \pgfusepath{draw}
%
%
      }
    }
}
\pgfcircdeclareeurologicport{and}{$\&$}{\pgf@circ@res@count}{}
\pgfcircdeclareeurologicport{or}{$\ge 1$}{\pgf@circ@res@count}{}
\pgfcircdeclareeurologicport{xor}{$=1$}{\pgf@circ@res@count}{}
\pgfcircdeclareeurologicport{not}{$1$}{1}{not}
\pgfcircdeclareeurologicport{nand}{$\&$}{\pgf@circ@res@count}{not}
\pgfcircdeclareeurologicport{nor}{$\ge 1$}{\pgf@circ@res@count}{not}
\pgfcircdeclareeurologicport{xnor}{$=1$}{\pgf@circ@res@count}{not}
\makeatother

\begin{document}
\begin{circuitikz}
\node[european and port] (A) at (0,0) {};
\node[european nand port,number inputs=3] at (0,-2) {};
\node[european or port,number inputs=4] at (2,0) {};
\node[european nor port,number inputs=5] at (2,-2) {};
\node[european xor port,number inputs=6] at (4,0) {};
\node[european xnor port,number inputs=7] at (4,-2) {};
\node[european not port] (B) at (0,-4) {};
\draw[red] (A.center) -- (B.center);

\end{circuitikz}
\end{document}

demo

Just for those who are interested in the European ports, here is an adaption of the American ports created by John Kormylo (I hope I did not mess it up completely).

european ports

\documentclass{standalone}
\usepackage{circuitikz}

\ctikzset{tripoles/european and port/origin/.initial=0.8}
\ctikzset{tripoles/european and port/inputs/.initial=2}

\ctikzset{tripoles/european nand port/origin/.initial=0.8}
\ctikzset{tripoles/european nand port/inputs/.initial=2}

\ctikzset{tripoles/european nor port/origin/.initial=0.8}
\ctikzset{tripoles/european nor port/inputs/.initial=2}

\ctikzset{tripoles/european or port/origin/.initial=0.8}
\ctikzset{tripoles/european or port/inputs/.initial=2}

\ctikzset{tripoles/european xor port/origin/.initial=0.8}
\ctikzset{tripoles/european xor port/inputs/.initial=2}

\ctikzset{tripoles/european xnor port/origin/.initial=0.8}
\ctikzset{tripoles/european xnor port/inputs/.initial=2}

\pgfkeys{/tikz/number inputs/.initial=0}
\pgfkeys{/tikz/number inputs/.default=0}

\makeatletter
\newcount{\pgf@circ@res@count}% reserve global register
\newcommand{\pgf@circ@logicport@input}[1]% #1 = \pgfmathcounter
{%
  \pgfextracty{\pgf@circ@res@up}{\northeast}%
  \step
  \pgf@circ@res@step=\dimexpr 2\pgf@y -2\pgf@circ@res@up\relax
  \advance\pgf@y by -#1\pgf@circ@res@step\relax
}

\long\def\pgfcircdeclareeurologicport#1#2#3#4{
    \pgfdeclareshape{european #1 port}
    {
    \savedmacro\resize{% automatic
      \pgf@circ@res@up = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/height}\pgf@circ@Rlen
      \pgf@circ@res@up = .5\pgf@circ@res@up
      \pgf@circ@res@down = -\pgf@circ@res@up
      \pgf@circ@res@right = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/width}\pgf@circ@Rlen
      \pgf@circ@res@right = .5\pgf@circ@res@right
      \pgf@circ@res@left = -\pgf@circ@res@right
    }%
    \savedmacro\inputs{% get number of inputs
      \pgf@circ@res@count=\pgfkeysvalueof{/tikz/number inputs}\relax%
      \ifnum\pgf@circ@res@count=0
        \pgf@circ@res@count=\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/inputs}\relax%
      \fi
      \ifnum\pgf@circ@res@count<2 \pgf@circ@res@count=2\fi
      \ifnum\pgf@circ@res@count>16 \pgf@circ@res@count=16\fi
      \def\inputs{\the\pgf@circ@res@count}%
    }%
    \savedanchor\step{% 1/2 gap at edges
      \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/height}\pgf@circ@Rlen
      \divide\pgf@circ@res@step by \pgf@circ@res@count
      \pgfpoint{\pgf@circ@res@left}{\dimexpr\pgf@circ@res@up+0.5\pgf@circ@res@step}%
    }%
    \savedanchor\northwest{%
      \pgf@y=\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/height}\pgf@circ@Rlen
      \pgf@y=.5\pgf@y
      \pgf@x=-\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/width}\pgf@circ@Rlen
      \pgf@x=.5\pgf@x
    } 
    \savedanchor\northeast{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
    \savedanchor\southwest{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
    \savedanchor\left{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}{0pt}}
    \savedanchor\right{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{0pt}}
    \savedanchor\origin{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/origin}\pgf@circ@res@right}{0pt}}
      %
    \anchor{center}{\origin}% for backwards compatibility
    \anchor{text}{\pgfpoint{-.5\wd\pgfnodeparttextbox}{\dimexpr.5\dp\pgfnodeparttextbox-.5\ht\pgfnodeparttextbox}}
        %
      \expandafter\pgfutil@g@addto@macro\csname pgf@sh@s@european #1 port\endcsname{%
      \pgfmathloop%
      \ifnum\pgfmathcounter>\pgf@circ@res@count%
      \else%
        %\pgfutil@ifundefined{pgf@anchor@american #1 port@in \pgfmathcounter}{%
          \expandafter\xdef\csname pgf@anchor@european #1 port@in \pgfmathcounter\endcsname{%
            \noexpand\pgf@circ@logicport@input{\pgfmathcounter}% defined above
          }%
        %}{}%
      \repeatpgfmathloop%
    }
    %
    \anchor{out}{\pgfpoint{\pgf@circ@res@right}{0pt}}
        %
    \anchor{left}{\left}% edges of component mius leads
    \anchor{right}{\right}
        %
    \anchor{north east}{\northeast}% see \Compass macro
    \anchor{south west}{\southwest}
    \anchor{north}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfpoint{0cm}{\pgf@circ@res@up}}
    \anchor{north west}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfextractx{\pgf@circ@res@left}{\southwest}%
      \pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
    \anchor{west}{\pgfextractx{\pgf@circ@res@left}{\sosuthwest}%
      \pgfpoint{\pgf@circ@res@left}{0cm}}
    \anchor{south}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfpoint{0cm}{\pgf@circ@res@down}}
    \anchor{south east}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
    \anchor{east}{\pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{0cm}}
      \backgroundpath{          
            \pgfsetcolor{\pgfkeysvalueof{/tikz/circuitikz/color}}   
            \northwest
            \pgf@circ@res@up = \pgf@y 
            \pgf@circ@res@down = -\pgf@y
            \pgf@circ@res@right = -\pgf@x
            \pgf@circ@res@left = \pgf@x
            \def\pgf@temp{1}
            \def\pgf@circ@temp{#3}
            \pgfextracty{\pgf@circ@res@temp}{\step}%
          \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
          \pgf@circ@res@count = \inputs\relax
          \loop\ifnum\pgf@circ@res@count>0
            \advance\pgf@circ@res@temp by -\pgf@circ@res@step
          \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
            \pgfpathlineto{\pgfpoint
                {\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}
              {\pgf@circ@res@temp}}
            \advance\pgf@circ@res@count by -1
          \repeat
            %
            \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
            \pgfpathlineto{
                \pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{0pt}}
            %
            \edef\pgf@temp{not}
            \edef\pgf@circ@temp{#4}
            \ifx\pgf@temp\pgf@circ@temp % is a not
                \pgfpathmoveto{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/not width}\pgf@circ@res@right}{0pt}}
                \pgfpathlineto{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/not height}\pgf@circ@res@up}}
            \fi
            %
            \pgfusepath{draw}
            %
            \pgfpathmoveto{\pgfpointorigin}
            \pgftext{#2}
            %
            \pgfsetlinewidth{2\pgflinewidth}
            \pgfpathrectanglecorners
                {\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@left}{\pgf@circ@res@up}}
                {\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/european #1 port/reserved}\pgf@circ@res@right}{\pgf@circ@res@down}}
            \pgfusepath{draw}
      }
    }
}

\pgfcircdeclareeurologicport{and}{$\&$}{2}{}
\pgfcircdeclareeurologicport{or}{$\ge 1$}{2}{}
\pgfcircdeclareeurologicport{xor}{$=1$}{2}{}
\pgfcircdeclareeurologicport{not}{$1$}{1}{not}
\pgfcircdeclareeurologicport{nand}{$\&$}{2}{not}
\pgfcircdeclareeurologicport{nor}{$\ge 1$}{2}{not}
\pgfcircdeclareeurologicport{xnor}{$=1$}{2}{not}
\makeatother
\begin{document}
\begin{circuitikz}
\node[european and port] at (0,0) {};
\node[european nand port,number inputs=3] at (0,-2) {};
\node[european or port,number inputs=4] at (2,0) {};
\node[european nor port,number inputs=5] at (2,-2) {};
\node[european xor port,number inputs=6] at (4,0) {};
\node[european xnor port,number inputs=7] at (4,-2) {};
\end{circuitikz}
\end{document}

Is it possible to implement multiple input logic ports with circuitikz?

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