| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: modobject.c,v 2.24 2025/06/21 00:15:30 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for tracking object modifiers |
| 6 |
* |
| 7 |
* External symbols declared in object.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include "standard.h" |
| 13 |
#include "object.h" |
| 14 |
#include "otypes.h" |
| 15 |
|
| 16 |
|
| 17 |
static struct ohtab { |
| 18 |
int hsiz; /* current table size */ |
| 19 |
OBJECT *htab; /* table, if allocated */ |
| 20 |
} modtab = {100, NULL}, objtab = {1000, NULL}; /* modifiers and objects */ |
| 21 |
|
| 22 |
static int otndx(char *, struct ohtab *); |
| 23 |
|
| 24 |
|
| 25 |
OBJECT |
| 26 |
objndx( /* get object number from pointer */ |
| 27 |
OBJREC *op |
| 28 |
) |
| 29 |
{ |
| 30 |
#ifndef ONCACHESIZ |
| 31 |
#define ONCACHESIZ 907 /* keep a cache of previous searches */ |
| 32 |
#endif |
| 33 |
static OBJECT oncache[ONCACHESIZ]; |
| 34 |
const int ent = (size_t)op % ONCACHESIZ; |
| 35 |
int i; |
| 36 |
/* clear cache on first call */ |
| 37 |
for (i = ONCACHESIZ*(!oncache[0] & !oncache[1]); i--; ) |
| 38 |
oncache[i] = OVOID; |
| 39 |
/* is this pointer in cache? */ |
| 40 |
if ((oncache[ent] != OVOID) & (oncache[ent] < nobjects) && |
| 41 |
objptr(oncache[ent]) == op) |
| 42 |
return(oncache[ent]); /* matches previous search */ |
| 43 |
/* else look for allocated block */ |
| 44 |
for (i = (nobjects-1)>>OBJBLKSHFT; i >= 0; i--) |
| 45 |
if ((objblock[i] <= op) & (op < objblock[i]+OBJBLKSIZ)) { |
| 46 |
/* found it -- save index to cache */ |
| 47 |
oncache[ent] = ((OBJECT)i << OBJBLKSHFT) + |
| 48 |
(op - objblock[i]); |
| 49 |
return(oncache[ent]); |
| 50 |
} |
| 51 |
return(OVOID); /* not in our array -- may still be valid */ |
| 52 |
} |
| 53 |
|
| 54 |
|
| 55 |
OBJECT |
| 56 |
lastmod( /* find modifier definition before obj */ |
| 57 |
OBJECT obj, |
| 58 |
char *mname |
| 59 |
) |
| 60 |
{ |
| 61 |
OBJREC *op; |
| 62 |
OBJECT i; |
| 63 |
|
| 64 |
i = modifier(mname); /* try hash table first */ |
| 65 |
if ((obj == OVOID) | (i < obj)) |
| 66 |
return(i); |
| 67 |
for (i = obj; i-- > 0; ) { /* need to search */ |
| 68 |
op = objptr(i); |
| 69 |
if ((ismodifier(op->otype) != 0) & (op->oname[0] == mname[0]) |
| 70 |
&& !strcmp(op->oname, mname)) |
| 71 |
return(i); |
| 72 |
} |
| 73 |
return(OVOID); |
| 74 |
} |
| 75 |
|
| 76 |
|
| 77 |
OBJECT |
| 78 |
modifier( /* get a modifier number from its name */ |
| 79 |
char *mname |
| 80 |
) |
| 81 |
{ |
| 82 |
int ndx; |
| 83 |
|
| 84 |
ndx = otndx(mname, &modtab); |
| 85 |
return(modtab.htab[ndx]); |
| 86 |
} |
| 87 |
|
| 88 |
|
| 89 |
#ifdef GETOBJ |
| 90 |
OBJECT |
| 91 |
object( /* get an object number from its name */ |
| 92 |
char *oname |
| 93 |
) |
| 94 |
{ |
| 95 |
int ndx; |
| 96 |
|
| 97 |
ndx = otndx(oname, &objtab); |
| 98 |
return(objtab.htab[ndx]); |
| 99 |
} |
| 100 |
#endif |
| 101 |
|
| 102 |
|
| 103 |
int |
| 104 |
eqreal( /* are two real values close enough to equal? */ |
| 105 |
double d1, |
| 106 |
double d2 |
| 107 |
) |
| 108 |
{ |
| 109 |
if (d2 != 0.0) |
| 110 |
d1 = d1/d2 - 1.0; |
| 111 |
return((-FTINY <= d1) & (d1 <= FTINY)); |
| 112 |
} |
| 113 |
|
| 114 |
|
| 115 |
int |
| 116 |
eqobjects( /* check if two objects are equal */ |
| 117 |
OBJECT obj1, |
| 118 |
OBJECT obj2 |
| 119 |
) |
| 120 |
{ |
| 121 |
OBJREC *op1, *op2; |
| 122 |
int i, n; |
| 123 |
|
| 124 |
while (obj1 != obj2) { |
| 125 |
if (obj1 == OVOID) |
| 126 |
return(0); |
| 127 |
if (obj2 == OVOID) |
| 128 |
return(0); |
| 129 |
op1 = objptr(obj1); |
| 130 |
op2 = objptr(obj2); |
| 131 |
if (op1->otype != op2->otype) |
| 132 |
return(0); |
| 133 |
if (op1->oargs.nsargs != op2->oargs.nsargs) |
| 134 |
return(0); |
| 135 |
if (op1->oargs.nfargs != op2->oargs.nfargs) |
| 136 |
return(0); |
| 137 |
#ifdef IARGS |
| 138 |
if (op1->oargs.niargs != op2->oargs.niargs) |
| 139 |
return(0); |
| 140 |
for (i = op1->oargs.niargs; i-- > 0; ) |
| 141 |
if (op1->oargs.iarg[i] != op2->oargs.iarg[i]) |
| 142 |
return(0); |
| 143 |
#endif |
| 144 |
for (i = op1->oargs.nfargs; i-- > 0; ) |
| 145 |
if (!eqreal(op1->oargs.farg[i], op2->oargs.farg[i])) |
| 146 |
return(0); |
| 147 |
n = 0; |
| 148 |
switch (op1->otype) { /* special cases (KEEP CONSISTENT!) */ |
| 149 |
case MOD_ALIAS: |
| 150 |
case MAT_ILLUM: |
| 151 |
case MAT_MIRROR: |
| 152 |
n = (op1->oargs.nsargs > 0); |
| 153 |
break; |
| 154 |
case MIX_FUNC: |
| 155 |
case MIX_DATA: |
| 156 |
case MIX_TEXT: |
| 157 |
case MIX_PICT: |
| 158 |
n = 2*(op1->oargs.nsargs >= 2); |
| 159 |
break; |
| 160 |
case MAT_CLIP: |
| 161 |
n = op1->oargs.nsargs; |
| 162 |
break; |
| 163 |
} |
| 164 |
/* check other string arguments */ |
| 165 |
for (i = op1->oargs.nsargs; i-- > n; ) |
| 166 |
if (strcmp(op1->oargs.sarg[i], op2->oargs.sarg[i])) |
| 167 |
return(0); |
| 168 |
while (n-- > 0) /* check modifier references */ |
| 169 |
if (!eqobjects( lastmod(obj1, op1->oargs.sarg[n]), |
| 170 |
lastmod(obj2, op2->oargs.sarg[n]) )) |
| 171 |
return(0); |
| 172 |
obj1 = op1->omod; |
| 173 |
obj2 = op2->omod; |
| 174 |
} |
| 175 |
return(1); |
| 176 |
} |
| 177 |
|
| 178 |
|
| 179 |
void |
| 180 |
insertobject( /* insert new object into our list */ |
| 181 |
OBJECT obj |
| 182 |
) |
| 183 |
{ |
| 184 |
int i; |
| 185 |
|
| 186 |
if (ismodifier(objptr(obj)->otype)) { |
| 187 |
i = otndx(objptr(obj)->oname, &modtab); |
| 188 |
if (eqobjects(obj, modtab.htab[i])) |
| 189 |
return; /* don't index if same as earlier def. */ |
| 190 |
modtab.htab[i] = obj; |
| 191 |
} |
| 192 |
#ifdef GETOBJ |
| 193 |
else { |
| 194 |
i = otndx(objptr(obj)->oname, &objtab); |
| 195 |
objtab.htab[i] = obj; |
| 196 |
} |
| 197 |
#endif |
| 198 |
for (i = 0; addobjnotify[i] != NULL; i++) |
| 199 |
(*addobjnotify[i])(obj); |
| 200 |
} |
| 201 |
|
| 202 |
|
| 203 |
void |
| 204 |
truncobjndx(void) /* remove bogus table entries past end */ |
| 205 |
{ |
| 206 |
int ndx; |
| 207 |
|
| 208 |
if (nobjects <= 0) { |
| 209 |
if (modtab.htab != NULL) { |
| 210 |
free(modtab.htab); |
| 211 |
modtab.htab = NULL; |
| 212 |
modtab.hsiz = 100; |
| 213 |
} |
| 214 |
if (objtab.htab != NULL) { |
| 215 |
free(objtab.htab); |
| 216 |
objtab.htab = NULL; |
| 217 |
objtab.hsiz = 100; |
| 218 |
} |
| 219 |
return; |
| 220 |
} |
| 221 |
for (ndx = modtab.hsiz*(modtab.htab != NULL); ndx--; ) |
| 222 |
if (modtab.htab[ndx] >= nobjects) |
| 223 |
modtab.htab[ndx] = OVOID; |
| 224 |
|
| 225 |
for (ndx = objtab.hsiz*(objtab.htab != NULL); ndx--; ) |
| 226 |
if (objtab.htab[ndx] >= nobjects) |
| 227 |
objtab.htab[ndx] = OVOID; |
| 228 |
} |
| 229 |
|
| 230 |
|
| 231 |
static int |
| 232 |
nexthsiz( /* return next hash table size */ |
| 233 |
int oldsiz |
| 234 |
) |
| 235 |
{ |
| 236 |
static int hsiztab[] = { |
| 237 |
251, 509, 1021, 2039, 4093, 8191, 16381, |
| 238 |
32749, 65521, 131071, 262139, 0 |
| 239 |
}; |
| 240 |
int *hsp; |
| 241 |
|
| 242 |
for (hsp = hsiztab; *hsp; hsp++) |
| 243 |
if (*hsp > oldsiz) |
| 244 |
return(*hsp); |
| 245 |
return(oldsiz*2 + 1); /* not always prime */ |
| 246 |
} |
| 247 |
|
| 248 |
|
| 249 |
static int |
| 250 |
otndx( /* get object table index for name */ |
| 251 |
char *name, |
| 252 |
struct ohtab *tab |
| 253 |
) |
| 254 |
{ |
| 255 |
char *onm; |
| 256 |
OBJECT *oldhtab; |
| 257 |
int hval, i; |
| 258 |
int ndx; |
| 259 |
|
| 260 |
if (tab->htab == NULL) { /* new table */ |
| 261 |
tab->hsiz = nexthsiz(tab->hsiz); |
| 262 |
tab->htab = (OBJECT *)malloc(tab->hsiz*sizeof(OBJECT)); |
| 263 |
if (tab->htab == NULL) |
| 264 |
error(SYSTEM, "out of memory in otndx"); |
| 265 |
ndx = tab->hsiz; |
| 266 |
while (ndx--) /* empty it */ |
| 267 |
tab->htab[ndx] = OVOID; |
| 268 |
} |
| 269 |
/* look up object */ |
| 270 |
hval = shash(name); |
| 271 |
tryagain: |
| 272 |
for (i = 0; i < tab->hsiz; i++) { |
| 273 |
ndx = (hval + (unsigned long)i*i) % tab->hsiz; |
| 274 |
if (tab->htab[ndx] == OVOID) |
| 275 |
return(ndx); |
| 276 |
onm = objptr(tab->htab[ndx])->oname; |
| 277 |
if (onm != NULL && !strcmp(onm, name)) |
| 278 |
return(ndx); |
| 279 |
} |
| 280 |
/* table is full, reallocate */ |
| 281 |
oldhtab = tab->htab; |
| 282 |
ndx = tab->hsiz; |
| 283 |
tab->htab = NULL; |
| 284 |
while (ndx--) |
| 285 |
if (oldhtab[ndx] != OVOID) { |
| 286 |
onm = objptr(oldhtab[ndx])->oname; |
| 287 |
if (onm == NULL) |
| 288 |
continue; |
| 289 |
i = otndx(onm, tab); |
| 290 |
tab->htab[i] = oldhtab[ndx]; |
| 291 |
} |
| 292 |
free(oldhtab); |
| 293 |
goto tryagain; /* should happen only once! */ |
| 294 |
} |
