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Comparing src/common/lookup.c (file contents):
Revision 2.1 by greg, Wed Jul 6 15:14:15 1994 UTC vs.
Revision 2.6 by greg, Sat Feb 22 02:07:22 2003 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1994 Regents of the University of California */
2 –
1   #ifndef lint
2 < static char SCCSid[] = "$SunId$ LBL";
2 > static const char       RCSid[] = "$Id$";
3   #endif
6 –
4   /*
5   * Table lookup routines
6   */
7  
8 + /* ====================================================================
9 + * The Radiance Software License, Version 1.0
10 + *
11 + * Copyright (c) 1990 - 2002 The Regents of the University of California,
12 + * through Lawrence Berkeley National Laboratory.   All rights reserved.
13 + *
14 + * Redistribution and use in source and binary forms, with or without
15 + * modification, are permitted provided that the following conditions
16 + * are met:
17 + *
18 + * 1. Redistributions of source code must retain the above copyright
19 + *         notice, this list of conditions and the following disclaimer.
20 + *
21 + * 2. Redistributions in binary form must reproduce the above copyright
22 + *       notice, this list of conditions and the following disclaimer in
23 + *       the documentation and/or other materials provided with the
24 + *       distribution.
25 + *
26 + * 3. The end-user documentation included with the redistribution,
27 + *           if any, must include the following acknowledgment:
28 + *             "This product includes Radiance software
29 + *                 (http://radsite.lbl.gov/)
30 + *                 developed by the Lawrence Berkeley National Laboratory
31 + *               (http://www.lbl.gov/)."
32 + *       Alternately, this acknowledgment may appear in the software itself,
33 + *       if and wherever such third-party acknowledgments normally appear.
34 + *
35 + * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
36 + *       and "The Regents of the University of California" must
37 + *       not be used to endorse or promote products derived from this
38 + *       software without prior written permission. For written
39 + *       permission, please contact [email protected].
40 + *
41 + * 5. Products derived from this software may not be called "Radiance",
42 + *       nor may "Radiance" appear in their name, without prior written
43 + *       permission of Lawrence Berkeley National Laboratory.
44 + *
45 + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
46 + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
47 + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
48 + * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
49 + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
50 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
51 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
52 + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
53 + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
54 + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
55 + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 + * SUCH DAMAGE.
57 + * ====================================================================
58 + *
59 + * This software consists of voluntary contributions made by many
60 + * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
61 + * information on Lawrence Berkeley National Laboratory, please see
62 + * <http://www.lbl.gov/>.
63 + */
64 +
65   #include <stdio.h>
66 + #include <stdlib.h>
67   #include "lookup.h"
68  
69 < #define MEM_PTR         char *
69 > #ifdef  NOSTRUCTASS
70 > #define  copystruct(d,s)        bcopy((char *)(s),(char *)(d),sizeof(*(d)))
71 > #else
72 > #define  copystruct(d,s)        (*(d) = *(s))
73 > #endif
74  
16 – extern MEM_PTR  calloc();
75  
18 –
76   int
77   lu_init(tbl, nel)               /* initialize tbl for at least nel elements */
78   register LUTAB  *tbl;
79   int     nel;
80   {
81          static int  hsiztab[] = {
82 <                31, 61, 127, 251, 509, 1021, 2039, 4093, 8191, 16381, 0
82 >                31, 61, 127, 251, 509, 1021, 2039, 4093, 8191, 16381,
83 >                32749, 65521, 131071, 262139, 524287, 1048573, 2097143,
84 >                4194301, 8388593, 0
85          };
86          register int  *hsp;
87  
# Line 40 | Line 99 | int    nel;
99   }
100  
101  
102 < long
102 > unsigned long
103   lu_shash(s)                     /* hash a nul-terminated string */
104 < register char  *s;
104 > char    *s;
105   {
106 +        static unsigned char shuffle[256] = {
107 +                0, 157, 58, 215, 116, 17, 174, 75, 232, 133, 34,
108 +                191, 92, 249, 150, 51, 208, 109, 10, 167, 68, 225,
109 +                126, 27, 184, 85, 242, 143, 44, 201, 102, 3, 160,
110 +                61, 218, 119, 20, 177, 78, 235, 136, 37, 194, 95,
111 +                252, 153, 54, 211, 112, 13, 170, 71, 228, 129, 30,
112 +                187, 88, 245, 146, 47, 204, 105, 6, 163, 64, 221,
113 +                122, 23, 180, 81, 238, 139, 40, 197, 98, 255, 156,
114 +                57, 214, 115, 16, 173, 74, 231, 132, 33, 190, 91,
115 +                248, 149, 50, 207, 108, 9, 166, 67, 224, 125, 26,
116 +                183, 84, 241, 142, 43, 200, 101, 2, 159, 60, 217,
117 +                118, 19, 176, 77, 234, 135, 36, 193, 94, 251, 152,
118 +                53, 210, 111, 12, 169, 70, 227, 128, 29, 186, 87,
119 +                244, 145, 46, 203, 104, 5, 162, 63, 220, 121, 22,
120 +                179, 80, 237, 138, 39, 196, 97, 254, 155, 56, 213,
121 +                114, 15, 172, 73, 230, 131, 32, 189, 90, 247, 148,
122 +                49, 206, 107, 8, 165, 66, 223, 124, 25, 182, 83,
123 +                240, 141, 42, 199, 100, 1, 158, 59, 216, 117, 18,
124 +                175, 76, 233, 134, 35, 192, 93, 250, 151, 52, 209,
125 +                110, 11, 168, 69, 226, 127, 28, 185, 86, 243, 144,
126 +                45, 202, 103, 4, 161, 62, 219, 120, 21, 178, 79,
127 +                236, 137, 38, 195, 96, 253, 154, 55, 212, 113, 14,
128 +                171, 72, 229, 130, 31, 188, 89, 246, 147, 48, 205,
129 +                106, 7, 164, 65, 222, 123, 24, 181, 82, 239, 140,
130 +                41, 198, 99
131 +        };
132          register int    i = 0;
133 <        register long   h = 0;
133 >        register unsigned long  h = 0;
134 >        register unsigned char *t = (unsigned char *)s;
135  
136 <        while (*s)
137 <                h ^= (long)(*s++ & 0xff) << (i++ & 15);
136 >        while (*t)
137 >                h ^= (unsigned long)shuffle[*t++] << ((i+=11) & 0xf);
138 >
139          return(h);
140   }
141  
# Line 58 | Line 145 | lu_find(tbl, key)              /* find a table entry */
145   register LUTAB  *tbl;
146   char    *key;
147   {
148 <        long    hval;
149 <        int     i;
148 >        unsigned long   hval;
149 >        int     i, n;
150          register int    ndx;
151 <        register LUENT  *oldtabl;
151 >        register LUENT  *le;
152                                          /* look up object */
153 +        if (tbl->tsiz == 0 && !lu_init(tbl, 1))
154 +                return(NULL);
155          hval = (*tbl->hashf)(key);
156   tryagain:
157 <        for (i = 0; i < tbl->tsiz; i++) {
158 <                ndx = (hval + i*i) % tbl->tsiz;
159 <                if (tbl->tabl[ndx].key == NULL) {
160 <                        tbl->tabl[ndx].hval = hval;
161 <                        return(&tbl->tabl[ndx]);
157 >        ndx = hval % tbl->tsiz;
158 >        for (i = 0, n = 1; i < tbl->tsiz; i++, n += 2) {
159 >                le = &tbl->tabl[ndx];
160 >                if (le->key == NULL) {
161 >                        le->hval = hval;
162 >                        return(le);
163                  }
164 <                if ( tbl->tabl[ndx].hval == hval && (tbl->keycmp == NULL ||
165 <                                !(*tbl->keycmp)(tbl->tabl[ndx].key, key)) )
166 <                        return(&tbl->tabl[ndx]);
164 >                if (le->hval == hval &&
165 >                      (tbl->keycmp == NULL || !(*tbl->keycmp)(le->key, key))) {
166 >                        return(le);
167 >                }
168 >                if ((ndx += n) >= tbl->tsiz)    /* this happens rarely */
169 >                        ndx = ndx % tbl->tsiz;
170          }
171                                          /* table is full, reallocate */
172 <        oldtabl = tbl->tabl;
172 >        le = tbl->tabl;
173          ndx = tbl->tsiz;
174          i = tbl->ndel;
175 <        if (!lu_init(tbl, ndx-i)) {     /* no more memory! */
176 <                tbl->tabl = oldtabl;
175 >        if (!lu_init(tbl, ndx-i+1)) {   /* no more memory! */
176 >                tbl->tabl = le;
177                  tbl->tsiz = ndx;
178                  tbl->ndel = i;
179                  return(NULL);
180          }
88 –        if (!ndx)
89 –                goto tryagain;
181          /*
182           * The following code may fail if the user has reclaimed many
183           * deleted entries and the system runs out of memory in a
184           * recursive call to lu_find().
185           */
186          while (ndx--)
187 <                if (oldtabl[ndx].key != NULL)
188 <                        if (oldtabl[ndx].data != NULL)
189 <                                *lu_find(tbl, oldtabl[ndx].key) = oldtabl[ndx];
187 >                if (le[ndx].key != NULL)
188 >                        if (le[ndx].data != NULL)
189 >                                copystruct(lu_find(tbl,le[ndx].key), &le[ndx]);
190                          else if (tbl->freek != NULL)
191 <                                (*tbl->freek)(oldtabl[ndx].key);
192 <        free((MEM_PTR)oldtabl);
191 >                                (*tbl->freek)(le[ndx].key);
192 >        free((void *)le);
193          goto tryagain;                  /* should happen only once! */
194   }
195  
# Line 121 | Line 212 | char   *key;
212   }
213  
214  
215 + int
216 + lu_doall(tbl, f)                /* loop through all valid table entries */
217 + register LUTAB  *tbl;
218 + int     (*f)();
219 + {
220 +        int     rval = 0;
221 +        register LUENT  *tp;
222 +
223 +        for (tp = tbl->tabl + tbl->tsiz; tp-- > tbl->tabl; )
224 +                if (tp->data != NULL)
225 +                        if (f != NULL)
226 +                                rval += (*f)(tp);
227 +                        else
228 +                                rval++;
229 +        return(rval);
230 + }
231 +
232 +
233   void
234   lu_done(tbl)                    /* free table and contents */
235   register LUTAB  *tbl;
# Line 136 | Line 245 | register LUTAB *tbl;
245                          if (tp->data != NULL && tbl->freed != NULL)
246                                  (*tbl->freed)(tp->data);
247                  }
248 <        free((MEM_PTR)tbl->tabl);
248 >        free((void *)tbl->tabl);
249          tbl->tabl = NULL;
250          tbl->tsiz = 0;
251          tbl->ndel = 0;

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