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include <tbset.h>
# INVERT -- Create the complement (inverse) of an array of column pointers
#
# B.Simon 20-Oct-87 First Code
procedure invert (tp, numptr, colptr)
pointer tp # i: Table descriptor
int numptr # io: Number of column pointers
pointer colptr[ARB] # io: Array of column pointers
bool match
int numcol, icol, iptr, jptr
pointer newptr, cp
int tbpsta(), tbcnum()
begin
# Create a temporary array to hold the pointers
numcol = tbpsta (tp, TBL_NCOLS)
call malloc (newptr, numcol, TY_INT)
jptr = 0
do icol = 1, numcol {
# Get each pointer in the table and
# see if it is in the original array
cp = tbcnum (tp, icol)
match = false
do iptr = 1, numptr {
if (cp == colptr[iptr]) {
match = true
break
}
}
# If not, add it to the temporary array
if (! match) {
Memi[newptr+jptr] = cp
jptr = jptr + 1
}
}
# Copy the temporary array to the output array
numptr = jptr
call amovi (Memi[newptr], colptr, numptr)
call mfree (newptr, TY_INT)
end
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