?? shell.c
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#ifndef lintstatic char *sccsid = "@(#)shell.c 4.1 (Berkeley) 5/6/83";#endif/* * SORTS UP. * IF THERE ARE NO EXCHANGES (IEX=0) ON A SWEEP * THE COMPARISON GAP (IGAP) IS HALVED FOR THE NEXT SWEEP */shell (n, comp, exch)int (*comp)(), (*exch)();{ int igap, iplusg, iex, i, imax; igap=n; while (igap > 1) { igap /= 2; imax = n-igap; do { iex=0; for(i=0; i<imax; i++) { iplusg = i + igap; if ((*comp) (i, iplusg) ) continue; (*exch) (i, iplusg); iex=1; } } while (iex>0); }}
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