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root/radiance/ray/src/common/otypes.c
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Comparing ray/src/common/otypes.c (file contents):
Revision 1.4 by greg, Fri Jan 12 11:15:40 1990 UTC vs.
Revision 1.6 by greg, Wed Jul 24 12:06:35 1991 UTC

# Line 5 | Line 5 | static char SCCSid[] = "$SunId$ LBL";
5   #endif
6  
7   /*
8 < *  otypes.c - object lookup functions.
9 < *
10 < *     7/29/85
8 > * Object type lookup and error reporting
9   */
10  
11   #include  "standard.h"
# Line 17 | Line 15 | static char SCCSid[] = "$SunId$ LBL";
15   #include  "otypes.h"
16  
17  
20 – extern int  (*addobjnotify[])();        /* people to notify of new objects */
21 –
22 – FUN  ofun[NUMOTYPE] = INIT_OTYPE;       /* our object function table */
23 –
24 – static struct ohtab {
25 –        int  hsiz;                      /* current table size */
26 –        OBJECT  *htab;                  /* table, if allocated */
27 – }  modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */
28 –
29 –
18   int
19   otype(ofname)                   /* get object function number from its name */
20   register char  *ofname;
# Line 41 | Line 29 | register char  *ofname;
29   }
30  
31  
44 – #ifdef  GETOBJ
45 – int
46 – object(oname)                   /* get an object number from its name */
47 – char  *oname;
48 – {
49 –        register int  ndx;
50 –
51 –        ndx = otndx(oname, &objtab);
52 –        return(objtab.htab[ndx]);
53 – }
54 – #endif
55 –
56 –
57 – int
58 – modifier(mname)                 /* get a modifier number from its name */
59 – char  *mname;
60 – {
61 –        register int  ndx;
62 –
63 –        ndx = otndx(mname, &modtab);
64 –        return(modtab.htab[ndx]);
65 – }
66 –
67 –
68 – insertobject(obj)               /* insert new object into our list */
69 – register OBJECT  obj;
70 – {
71 –        register int  i;
72 –
73 – #ifdef  GETOBJ
74 –        i = otndx(objptr(obj)->oname, &objtab);
75 –        objtab.htab[i] = obj;
76 – #endif
77 –        if (ismodifier(objptr(obj)->otype)) {
78 –                i = otndx(objptr(obj)->oname, &modtab);
79 –                modtab.htab[i] = obj;
80 –        }
81 –        for (i = 0; addobjnotify[i] != NULL; i++)
82 –                (*addobjnotify[i])(obj);
83 – }
84 –
85 –
32   objerror(o, etyp, msg)          /* report error related to object */
33   OBJREC  *o;
34   int  etyp;
# Line 93 | Line 39 | char  *msg;
39          sprintf(msgbuf, "%s for %s \"%s\"",
40                          msg, ofun[o->otype].funame, o->oname);
41          error(etyp, msgbuf);
96 – }
97 –
98 –
99 – static int
100 – nexthsiz(oldsiz)                /* return next hash table size */
101 – int  oldsiz;
102 – {
103 –        static int  hsiztab[] = {
104 –                251, 509, 1021, 2039, 4093, 8191, 16381, 0
105 –        };
106 –        register int  *hsp;
107 –
108 –        for (hsp = hsiztab; *hsp; hsp++)
109 –                if (*hsp > oldsiz)
110 –                        return(*hsp);
111 –        return(oldsiz*2 + 1);           /* not always prime */
112 – }
113 –
114 –
115 – static int
116 – shash(s)                        /* hash a string */
117 – register char  *s;
118 – {
119 –        register int  h = 0;
120 –
121 –        while (*s)
122 –                h = (h<<1 & 0x7fff) ^ *s++;
123 –        return(h);
124 – }
125 –
126 –
127 – static int
128 – otndx(name, tab)                /* get object table index for name */
129 – char  *name;
130 – register struct ohtab  *tab;
131 – {
132 –        OBJECT  *oldhtab;
133 –        int  hval, i;
134 –        register int  ndx;
135 –
136 –        if (tab->htab == NULL) {                /* new table */
137 –                tab->hsiz = nexthsiz(tab->hsiz);
138 –                tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT));
139 –                if (tab->htab == NULL)
140 –                        error(SYSTEM, "out of memory in otndx");
141 –                ndx = tab->hsiz;
142 –                while (ndx--)                   /* empty it */
143 –                        tab->htab[ndx] = OVOID;
144 –        }
145 –                                        /* look up object */
146 –        hval = shash(name);
147 – tryagain:
148 –        for (i = 0; i < tab->hsiz; i++) {
149 –                ndx = (hval + i*i) % tab->hsiz;
150 –                if (tab->htab[ndx] == OVOID ||
151 –                                !strcmp(objptr(tab->htab[ndx])->oname, name))
152 –                        return(ndx);
153 –        }
154 –                                        /* table is full, reallocate */
155 –        oldhtab = tab->htab;
156 –        ndx = tab->hsiz;
157 –        tab->htab = NULL;
158 –        while (ndx--)
159 –                if (oldhtab[ndx] != OVOID) {
160 –                        i = otndx(objptr(oldhtab[ndx])->oname, tab);
161 –                        tab->htab[i] = oldhtab[ndx];
162 –                }
163 –        free((char *)oldhtab);
164 –        goto tryagain;                  /* should happen only once! */
42   }

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