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MODOBJEC.C
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C/C++ Source or Header
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1993-10-07
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3KB
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137 lines
/* Copyright (c) 1986 Regents of the University of California */
#ifndef lint
static char SCCSid[] = "@(#)modobject.c 2.1 11/12/91 LBL";
#endif
/*
* Routines for tracking object modifiers
*/
#include "standard.h"
#include "object.h"
#include "otypes.h"
extern int (*addobjnotify[])(); /* people to notify of new objects */
static struct ohtab {
int hsiz; /* current table size */
OBJECT *htab; /* table, if allocated */
} modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */
static int otndx();
#ifdef GETOBJ
int
object(oname) /* get an object number from its name */
char *oname;
{
register int ndx;
ndx = otndx(oname, &objtab);
return(objtab.htab[ndx]);
}
#endif
int
modifier(mname) /* get a modifier number from its name */
char *mname;
{
register int ndx;
ndx = otndx(mname, &modtab);
return(modtab.htab[ndx]);
}
insertobject(obj) /* insert new object into our list */
register OBJECT obj;
{
register int i;
#ifdef GETOBJ
i = otndx(objptr(obj)->oname, &objtab);
objtab.htab[i] = obj;
#endif
if (ismodifier(objptr(obj)->otype)) {
i = otndx(objptr(obj)->oname, &modtab);
modtab.htab[i] = obj;
}
for (i = 0; addobjnotify[i] != NULL; i++)
(*addobjnotify[i])(obj);
}
static int
nexthsiz(oldsiz) /* return next hash table size */
int oldsiz;
{
static int hsiztab[] = {
251, 509, 1021, 2039, 4093, 8191, 16381, 0
};
register int *hsp;
for (hsp = hsiztab; *hsp; hsp++)
if (*hsp > oldsiz)
return(*hsp);
return(oldsiz*2 + 1); /* not always prime */
}
static int
shash(s) /* hash a string */
register char *s;
{
register int h = 0;
while (*s)
h = (h<<1 & 0x7fff) ^ *s++;
return(h);
}
static int
otndx(name, tab) /* get object table index for name */
char *name;
register struct ohtab *tab;
{
OBJECT *oldhtab;
int hval, i;
register int ndx;
if (tab->htab == NULL) { /* new table */
tab->hsiz = nexthsiz(tab->hsiz);
tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT));
if (tab->htab == NULL)
error(SYSTEM, "out of memory in otndx");
ndx = tab->hsiz;
while (ndx--) /* empty it */
tab->htab[ndx] = OVOID;
}
/* look up object */
hval = shash(name);
tryagain:
for (i = 0; i < tab->hsiz; i++) {
ndx = (hval + i*i) % tab->hsiz;
if (tab->htab[ndx] == OVOID ||
!strcmp(objptr(tab->htab[ndx])->oname, name))
return(ndx);
}
/* table is full, reallocate */
oldhtab = tab->htab;
ndx = tab->hsiz;
tab->htab = NULL;
while (ndx--)
if (oldhtab[ndx] != OVOID) {
i = otndx(objptr(oldhtab[ndx])->oname, tab);
tab->htab[i] = oldhtab[ndx];
}
free((char *)oldhtab);
goto tryagain; /* should happen only once! */
}