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/*
\funcref{fun\_sub}{void fun\_sub ()}
{}
{}
{pop(), copylist(), delfromlist(), discard()}
{}
{funsub.c}
{
Function {\em fun\_sub()} processes opcode {\em op\_sub}. Two variables
are popped and subtracted. Depending on their type, two integer values
are subtracted or a difference between two lists is computed.
The result of the subtraction is stored in a temporary variable, which
is then pushed.
The two popped variables are discarded after use.
}
*/
#include "icm-exec.h"
void fun_sub ()
{
VAR_
tmp,
lval,
rval;
register unsigned
i;
register LIST_
*rlist;
rval = pop ();
lval = pop ();
if (lval.type & e_int)
{
tmp.type = e_int;
tmp.vu.intval = lval.vu.intval - rval.vu.intval;
}
else
{
tmp = copylist (lval);
if ( (rlist = &(rval.vu.i->ls.list)) )
for (i = 0; i < rlist->size; i++)
tmp = delfromlist (tmp, rlist->element [i]);
}
push (tmp);
discard (lval);
discard (rval);
}
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