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greg |
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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* objset.c - routines for maintaining object sets. |
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* |
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* 7/28/85 |
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*/ |
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#include "standard.h" |
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#include "octree.h" |
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#include "object.h" |
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#define OSTSIZ 3037 /* object table size (a prime!) */ |
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static OBJECT *ostable[OSTSIZ]; /* the object set table */ |
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insertelem(os, obj) /* insert obj into os, no questions */ |
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register OBJECT *os; |
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OBJECT obj; |
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{ |
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register int i; |
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for (i = os[0]++; i > 0; i--) |
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if (os[i] > obj) |
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os[i+1] = os[i]; |
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else |
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break; |
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os[i+1] = obj; |
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} |
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deletelem(os, obj) /* delete obj from os, no questions */ |
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register OBJECT *os; |
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OBJECT obj; |
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{ |
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register int i; |
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for (i = (*os++)--; i > 0 && *os < obj; i--, os++) |
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; |
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while (--i > 0) { |
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os[0] = os[1]; |
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os++; |
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} |
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} |
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inset(os, obj) /* determine if object is in set */ |
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register OBJECT *os; |
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OBJECT obj; |
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{ |
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int upper, lower; |
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register int cm, i; |
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lower = 1; |
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upper = cm = os[0] + 1; |
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while ((i = (lower + upper) >> 1) != cm) { |
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cm = obj - os[i]; |
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if (cm > 0) |
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lower = i; |
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else if (cm < 0) |
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upper = i; |
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else |
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return(1); |
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cm = i; |
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} |
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return(0); |
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} |
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setequal(os1, os2) /* determine if two sets are equal */ |
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register OBJECT *os1, *os2; |
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{ |
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register int i; |
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for (i = *os1; i-- >= 0; ) |
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if (*os1++ != *os2++) |
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return(0); |
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return(1); |
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} |
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setcopy(os1, os2) /* copy object set os2 into os1 */ |
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register OBJECT *os1, *os2; |
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{ |
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register int i; |
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for (i = *os2; i-- >= 0; ) |
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*os1++ = *os2++; |
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} |
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OCTREE |
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fullnode(oset) /* return octree for object set */ |
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OBJECT *oset; |
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{ |
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int osentry, ntries; |
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long hval; |
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OCTREE ot; |
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register int i; |
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register OBJECT *os; |
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/* hash on set */ |
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hval = 0; |
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os = oset; |
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i = *os++; |
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while (i-- > 0) |
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hval += *os++; |
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ntries = 0; |
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tryagain: |
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osentry = (hval + (long)ntries*ntries) % OSTSIZ; |
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os = ostable[osentry]; |
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if (os == NULL) { |
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os = ostable[osentry] = (OBJECT *)malloc( |
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(unsigned)(oset[0]+2)*sizeof(OBJECT)); |
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if (os == NULL) |
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goto memerr; |
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ot = oseti(osentry); |
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} else { |
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/* look for set */ |
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for (i = 0; *os > 0; i++, os += *os + 1) |
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if (setequal(os, oset)) |
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break; |
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ot = oseti(i*OSTSIZ + osentry); |
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if (*os > 0) /* found it */ |
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return(ot); |
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if (!isfull(ot)) /* entry overflow */ |
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if (++ntries < OSTSIZ) |
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goto tryagain; |
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else |
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error(INTERNAL, "hash table overflow in fullnode"); |
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/* remember position */ |
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i = os - ostable[osentry]; |
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os = ostable[osentry] = (OBJECT *)realloc( |
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(char *)ostable[osentry], |
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(unsigned)(i+oset[0]+2)*sizeof(OBJECT)); |
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if (os == NULL) |
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goto memerr; |
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os += i; /* last entry */ |
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} |
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setcopy(os, oset); /* add new set */ |
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os += *os + 1; |
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*os = 0; /* terminator */ |
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return(ot); |
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memerr: |
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error(SYSTEM, "out of memory in fullnode"); |
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} |
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objset(oset, ot) /* get object set for full node */ |
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register OBJECT *oset; |
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OCTREE ot; |
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{ |
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register OBJECT *os; |
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register int i; |
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if (!isfull(ot)) |
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goto noderr; |
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i = oseti(ot); |
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if ((os = ostable[i%OSTSIZ]) == NULL) |
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goto noderr; |
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for (i /= OSTSIZ; i--; os += *os + 1) |
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if (*os <= 0) |
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goto noderr; |
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for (i = *os; i-- >= 0; ) /* copy set here */ |
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*oset++ = *os++; |
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return; |
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noderr: |
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error(CONSISTENCY, "bad node in objset"); |
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} |
