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greg |
1.1 |
/* 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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* Routines for tracking object modifiers
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*/
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#include "standard.h"
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#include "object.h"
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greg |
1.2 |
#include "otypes.h"
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greg |
1.1 |
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extern int (*addobjnotify[])(); /* people to notify of new objects */
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static struct ohtab {
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int hsiz; /* current table size */
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OBJECT *htab; /* table, if allocated */
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} modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */
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greg |
1.3 |
static int otndx();
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greg |
1.1 |
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#ifdef GETOBJ
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int
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object(oname) /* get an object number from its name */
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char *oname;
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{
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register int ndx;
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ndx = otndx(oname, &objtab);
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return(objtab.htab[ndx]);
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}
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#endif
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int
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modifier(mname) /* get a modifier number from its name */
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char *mname;
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{
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register int ndx;
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ndx = otndx(mname, &modtab);
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return(modtab.htab[ndx]);
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}
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insertobject(obj) /* insert new object into our list */
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register OBJECT obj;
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{
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register int i;
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#ifdef GETOBJ
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i = otndx(objptr(obj)->oname, &objtab);
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objtab.htab[i] = obj;
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#endif
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if (ismodifier(objptr(obj)->otype)) {
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i = otndx(objptr(obj)->oname, &modtab);
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modtab.htab[i] = obj;
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}
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for (i = 0; addobjnotify[i] != NULL; i++)
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(*addobjnotify[i])(obj);
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}
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static int
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nexthsiz(oldsiz) /* return next hash table size */
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int oldsiz;
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{
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static int hsiztab[] = {
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251, 509, 1021, 2039, 4093, 8191, 16381, 0
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};
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register int *hsp;
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for (hsp = hsiztab; *hsp; hsp++)
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if (*hsp > oldsiz)
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return(*hsp);
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return(oldsiz*2 + 1); /* not always prime */
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}
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static int
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shash(s) /* hash a string */
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register char *s;
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{
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register int h = 0;
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while (*s)
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h = (h<<1 & 0x7fff) ^ *s++;
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return(h);
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}
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static int
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otndx(name, tab) /* get object table index for name */
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char *name;
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register struct ohtab *tab;
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{
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OBJECT *oldhtab;
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int hval, i;
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register int ndx;
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if (tab->htab == NULL) { /* new table */
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tab->hsiz = nexthsiz(tab->hsiz);
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tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT));
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if (tab->htab == NULL)
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error(SYSTEM, "out of memory in otndx");
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ndx = tab->hsiz;
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while (ndx--) /* empty it */
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tab->htab[ndx] = OVOID;
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}
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/* look up object */
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hval = shash(name);
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tryagain:
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for (i = 0; i < tab->hsiz; i++) {
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ndx = (hval + i*i) % tab->hsiz;
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if (tab->htab[ndx] == OVOID ||
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!strcmp(objptr(tab->htab[ndx])->oname, name))
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return(ndx);
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}
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/* table is full, reallocate */
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oldhtab = tab->htab;
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ndx = tab->hsiz;
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tab->htab = NULL;
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while (ndx--)
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if (oldhtab[ndx] != OVOID) {
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i = otndx(objptr(oldhtab[ndx])->oname, tab);
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tab->htab[i] = oldhtab[ndx];
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}
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free((char *)oldhtab);
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goto tryagain; /* should happen only once! */
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}
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