| 1 |
/* Copyright (c) 1992 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Routines for tracking object modifiers |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
|
| 13 |
#include "object.h" |
| 14 |
|
| 15 |
#include "otypes.h" |
| 16 |
|
| 17 |
|
| 18 |
extern int (*addobjnotify[])(); /* people to notify of new objects */ |
| 19 |
|
| 20 |
static struct ohtab { |
| 21 |
int hsiz; /* current table size */ |
| 22 |
OBJECT *htab; /* table, if allocated */ |
| 23 |
} modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */ |
| 24 |
|
| 25 |
static int otndx(); |
| 26 |
|
| 27 |
|
| 28 |
int |
| 29 |
objndx(op) /* get object number from pointer */ |
| 30 |
register OBJREC *op; |
| 31 |
{ |
| 32 |
register int i, j; |
| 33 |
|
| 34 |
for (i = nobjects>>6; i >= 0; i--) { |
| 35 |
j = op - objblock[i]; |
| 36 |
if (j >= 0 && j < 0100) |
| 37 |
return((i<<6) + j); |
| 38 |
} |
| 39 |
return(OVOID); |
| 40 |
} |
| 41 |
|
| 42 |
|
| 43 |
int |
| 44 |
lastmod(obj, mname) /* find modifier definition before obj */ |
| 45 |
OBJECT obj; |
| 46 |
char *mname; |
| 47 |
{ |
| 48 |
register OBJREC *op; |
| 49 |
register int i; |
| 50 |
|
| 51 |
i = modifier(mname); /* try hash table first */ |
| 52 |
if (i < obj) |
| 53 |
return(i); |
| 54 |
for (i = obj; i-- > 0; ) { /* need to search */ |
| 55 |
op = objptr(i); |
| 56 |
if (ismodifier(op->otype) && !strcmp(op->oname, mname)) |
| 57 |
return(i); |
| 58 |
} |
| 59 |
return(OVOID); |
| 60 |
} |
| 61 |
|
| 62 |
|
| 63 |
int |
| 64 |
modifier(mname) /* get a modifier number from its name */ |
| 65 |
char *mname; |
| 66 |
{ |
| 67 |
register int ndx; |
| 68 |
|
| 69 |
ndx = otndx(mname, &modtab); |
| 70 |
return(modtab.htab[ndx]); |
| 71 |
} |
| 72 |
|
| 73 |
|
| 74 |
#ifdef GETOBJ |
| 75 |
int |
| 76 |
object(oname) /* get an object number from its name */ |
| 77 |
char *oname; |
| 78 |
{ |
| 79 |
register int ndx; |
| 80 |
|
| 81 |
ndx = otndx(oname, &objtab); |
| 82 |
return(objtab.htab[ndx]); |
| 83 |
} |
| 84 |
#endif |
| 85 |
|
| 86 |
|
| 87 |
insertobject(obj) /* insert new object into our list */ |
| 88 |
register OBJECT obj; |
| 89 |
{ |
| 90 |
register int i; |
| 91 |
|
| 92 |
if (ismodifier(objptr(obj)->otype)) { |
| 93 |
i = otndx(objptr(obj)->oname, &modtab); |
| 94 |
modtab.htab[i] = obj; |
| 95 |
} |
| 96 |
#ifdef GETOBJ |
| 97 |
else { |
| 98 |
i = otndx(objptr(obj)->oname, &objtab); |
| 99 |
objtab.htab[i] = obj; |
| 100 |
} |
| 101 |
#endif |
| 102 |
for (i = 0; addobjnotify[i] != NULL; i++) |
| 103 |
(*addobjnotify[i])(obj); |
| 104 |
} |
| 105 |
|
| 106 |
|
| 107 |
static int |
| 108 |
nexthsiz(oldsiz) /* return next hash table size */ |
| 109 |
int oldsiz; |
| 110 |
{ |
| 111 |
static int hsiztab[] = { |
| 112 |
251, 509, 1021, 2039, 4093, 8191, 16381, 0 |
| 113 |
}; |
| 114 |
register int *hsp; |
| 115 |
|
| 116 |
for (hsp = hsiztab; *hsp; hsp++) |
| 117 |
if (*hsp > oldsiz) |
| 118 |
return(*hsp); |
| 119 |
return(oldsiz*2 + 1); /* not always prime */ |
| 120 |
} |
| 121 |
|
| 122 |
|
| 123 |
static int |
| 124 |
otndx(name, tab) /* get object table index for name */ |
| 125 |
char *name; |
| 126 |
register struct ohtab *tab; |
| 127 |
{ |
| 128 |
OBJECT *oldhtab; |
| 129 |
int hval, i; |
| 130 |
register int ndx; |
| 131 |
|
| 132 |
if (tab->htab == NULL) { /* new table */ |
| 133 |
tab->hsiz = nexthsiz(tab->hsiz); |
| 134 |
tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT)); |
| 135 |
if (tab->htab == NULL) |
| 136 |
error(SYSTEM, "out of memory in otndx"); |
| 137 |
ndx = tab->hsiz; |
| 138 |
while (ndx--) /* empty it */ |
| 139 |
tab->htab[ndx] = OVOID; |
| 140 |
} |
| 141 |
/* look up object */ |
| 142 |
hval = shash(name); |
| 143 |
tryagain: |
| 144 |
for (i = 0; i < tab->hsiz; i++) { |
| 145 |
ndx = (hval + i*i) % tab->hsiz; |
| 146 |
if (tab->htab[ndx] == OVOID || |
| 147 |
!strcmp(objptr(tab->htab[ndx])->oname, name)) |
| 148 |
return(ndx); |
| 149 |
} |
| 150 |
/* table is full, reallocate */ |
| 151 |
oldhtab = tab->htab; |
| 152 |
ndx = tab->hsiz; |
| 153 |
tab->htab = NULL; |
| 154 |
while (ndx--) |
| 155 |
if (oldhtab[ndx] != OVOID) { |
| 156 |
i = otndx(objptr(oldhtab[ndx])->oname, tab); |
| 157 |
tab->htab[i] = oldhtab[ndx]; |
| 158 |
} |
| 159 |
free((char *)oldhtab); |
| 160 |
goto tryagain; /* should happen only once! */ |
| 161 |
} |
