ftp.nice.ch/pub/next/unix/audio/cmix.s.tar.gz#/cmix/lib/tablei.m

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float tablei(nsample,array,tab)

long nsample;
float *array,*tab;

{
	register loc1,loc2;
        float frac = ((float)(nsample)/(*tab)) * *(tab+1);
	if(frac < 0) return(array[0]);
	if(frac >= *(tab+1)) return(array[(int)*(tab+1)]);
	loc1 = frac;
	loc2 = loc1+1;
	frac = frac - (float)loc1;
	return(*(array+loc1) + frac * (*(array+loc2) - *(array+loc1)));
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.