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function vars=macrovar(macro)
// Returns in a list the set of varibles used by a macro
// mac : macro
// vars : list(in,out,globals,called,locals)
// in : input variables
// out: output variables
// globals: global variables
// called : macros called
// locals : local variables
//!
//origin S Steer inria 1992
// Copyright INRIA
if type(macro)==11 then comp(macro),end
if type(macro)<>13 then error('Argument to macrovars must be a macro!'),end
lst=macr2lst(macro);
out=lst(2)',if prod(size(out))==0 then out =[],end
in=lst(3)'
vars=[]
getted=[]
[vars,getted]=listvars(lst)
ng=prod(size(getted))
globals=[],called=[]
for k=1:ng
if (find(getted(k)==vars)==[])&(find(getted(k)==in)==[]) then
clear w //to avoid redefinition warning
ierr=execstr('w='+getted(k),'errcatch')
if ierr==0 then //the variable exists
if or(type(w)==[13 130 11]) then
called=[called;getted(k)]
else
globals=[globals;getted(k)]
end
else
globals=[globals;getted(k)]
end
end
end
locals=[]
nl=prod(size(vars))
for k=1:nl
if (find(vars(k)==in)==[])&(find(vars(k)==out)==[]) then
locals=[locals;vars(k)]
end
end
vars=list(in,out,globals,called,locals)
endfunction
function [vars,getted]=listvars(lst)
for lstk=lst
if type(lstk)==15 then
[vars,getted]=listvars(lstk)
else
if lstk(1)=='1'|lstk(1)=='for' then
// case 1 retained for 2.7 and earlier versions
vars=[vars;addvar(lstk(2))],
elseif lstk(1)=='29' then
nlhs=(size(lstk,'*')-2)/2
for k=0:nlhs-1
vars=[vars;addvar(lstk(3+2*k))],
end
elseif or(lstk(1)==['2','20']) then
getted=[getted;addget(lstk(2))],
end
end
end
endfunction
function vnam=addvar(vnam)
if find(vnam==vars)<>[] then
vnam=[]
end
endfunction
function vnam=addget(vnam)
if find(vnam==getted)<>[] then
vnam=[]
end
endfunction
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