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#ifndef lint |
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static const char RCSid[] = "$Id: modobject.c,v 2.25 2025/06/21 17:42:17 greg Exp $"; |
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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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* External symbols declared in object.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include "standard.h" |
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#include "object.h" |
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#include "otypes.h" |
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|
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|
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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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|
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static int otndx(char *, struct ohtab *); |
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|
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|
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OBJECT |
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objndx( /* get object number from pointer */ |
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OBJREC *op |
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) |
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{ |
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#ifndef ONCACHESIZ |
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#define ONCACHESIZ 907 /* keep a cache of previous searches */ |
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#endif |
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static OBJECT oncache[ONCACHESIZ]; |
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const int ent = (size_t)op % ONCACHESIZ; /* hash on pointer */ |
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int i, lastblock; |
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|
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#if OVOID != 0 /* clear cache on first call */ |
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for (i = ONCACHESIZ*(!oncache[0] & !oncache[1]); i--; ) |
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oncache[i] = OVOID; |
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#endif |
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/* is this pointer in cache? */ |
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if ((oncache[ent] != OVOID) & (oncache[ent] < nobjects) && |
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objptr(oncache[ent]) == op) |
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return(oncache[ent]); /* matches previous search */ |
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/* else search for our block from first */ |
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lastblock = (nobjects-1)>>OBJBLKSHFT; |
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for (i = 0; i <= lastblock; i++) |
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if ((objblock[i] <= op) & (op < objblock[i]+OBJBLKSIZ)) { |
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/* found it -- cache corresponding index */ |
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oncache[ent] = ((OBJECT)i << OBJBLKSHFT) + |
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(op - objblock[i]); |
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return(oncache[ent]); |
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} |
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return(OVOID); /* not allocated -- may still be valid */ |
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} |
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|
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|
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OBJECT |
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lastmod( /* find modifier definition before obj */ |
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OBJECT obj, |
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char *mname |
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) |
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{ |
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OBJREC *op; |
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OBJECT i; |
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|
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i = modifier(mname); /* try hash table first */ |
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if ((obj == OVOID) | (i < obj)) |
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return(i); |
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for (i = obj; i-- > 0; ) { /* need to search */ |
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op = objptr(i); |
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if ((ismodifier(op->otype) != 0) & (op->oname[0] == mname[0]) |
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&& !strcmp(op->oname, mname)) |
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return(i); |
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} |
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return(OVOID); |
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} |
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|
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|
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OBJECT |
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modifier( /* get a modifier number from its name */ |
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char *mname |
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) |
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{ |
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int ndx; |
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|
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ndx = otndx(mname, &modtab); |
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return(modtab.htab[ndx]); |
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} |
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|
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|
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#ifdef GETOBJ |
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OBJECT |
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object( /* get an object number from its name */ |
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char *oname |
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) |
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{ |
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int ndx; |
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|
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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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|
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|
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int |
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eqreal( /* are two real values close enough to equal? */ |
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double d1, |
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double d2 |
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) |
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{ |
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if (d2 != 0.0) |
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d1 = d1/d2 - 1.0; |
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return((-FTINY <= d1) & (d1 <= FTINY)); |
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} |
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|
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|
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int |
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eqobjects( /* check if two objects are equal */ |
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OBJECT obj1, |
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OBJECT obj2 |
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) |
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{ |
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OBJREC *op1, *op2; |
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int i, n; |
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|
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while (obj1 != obj2) { |
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if (obj1 == OVOID) |
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return(0); |
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if (obj2 == OVOID) |
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return(0); |
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op1 = objptr(obj1); |
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op2 = objptr(obj2); |
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if (op1->otype != op2->otype) |
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return(0); |
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if (op1->oargs.nsargs != op2->oargs.nsargs) |
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return(0); |
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if (op1->oargs.nfargs != op2->oargs.nfargs) |
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return(0); |
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#ifdef IARGS |
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if (op1->oargs.niargs != op2->oargs.niargs) |
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return(0); |
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for (i = op1->oargs.niargs; i-- > 0; ) |
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if (op1->oargs.iarg[i] != op2->oargs.iarg[i]) |
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return(0); |
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#endif |
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for (i = op1->oargs.nfargs; i-- > 0; ) |
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if (!eqreal(op1->oargs.farg[i], op2->oargs.farg[i])) |
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return(0); |
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n = 0; |
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switch (op1->otype) { /* special cases (KEEP CONSISTENT!) */ |
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case MOD_ALIAS: |
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case MAT_ILLUM: |
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case MAT_MIRROR: |
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n = (op1->oargs.nsargs > 0); |
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break; |
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case MIX_FUNC: |
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case MIX_DATA: |
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case MIX_TEXT: |
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case MIX_PICT: |
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n = 2*(op1->oargs.nsargs >= 2); |
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break; |
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case MAT_CLIP: |
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n = op1->oargs.nsargs; |
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break; |
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} |
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/* check other string arguments */ |
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for (i = op1->oargs.nsargs; i-- > n; ) |
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if (strcmp(op1->oargs.sarg[i], op2->oargs.sarg[i])) |
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return(0); |
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while (n-- > 0) /* check modifier references */ |
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if (!eqobjects( lastmod(obj1, op1->oargs.sarg[n]), |
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lastmod(obj2, op2->oargs.sarg[n]) )) |
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return(0); |
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obj1 = op1->omod; |
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obj2 = op2->omod; |
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} |
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return(1); |
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} |
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|
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|
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void |
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insertobject( /* insert new object into our list */ |
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OBJECT obj |
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) |
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{ |
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int i; |
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|
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if (ismodifier(objptr(obj)->otype)) { |
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i = otndx(objptr(obj)->oname, &modtab); |
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if (eqobjects(obj, modtab.htab[i])) |
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return; /* don't index if same as earlier def. */ |
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modtab.htab[i] = obj; |
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} |
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#ifdef GETOBJ |
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else { |
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i = otndx(objptr(obj)->oname, &objtab); |
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objtab.htab[i] = obj; |
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} |
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#endif |
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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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|
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|
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void |
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truncobjndx(void) /* remove bogus table entries past end */ |
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{ |
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int ndx; |
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|
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if (nobjects <= 0) { |
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if (modtab.htab != NULL) { |
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free(modtab.htab); |
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modtab.htab = NULL; |
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modtab.hsiz = 100; |
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} |
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if (objtab.htab != NULL) { |
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free(objtab.htab); |
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objtab.htab = NULL; |
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objtab.hsiz = 100; |
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} |
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return; |
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} |
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for (ndx = modtab.hsiz*(modtab.htab != NULL); ndx--; ) |
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if (modtab.htab[ndx] >= nobjects) |
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modtab.htab[ndx] = OVOID; |
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|
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for (ndx = objtab.hsiz*(objtab.htab != NULL); ndx--; ) |
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if (objtab.htab[ndx] >= nobjects) |
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objtab.htab[ndx] = OVOID; |
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} |
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|
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|
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static int |
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nexthsiz( /* return next hash table size */ |
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int oldsiz |
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) |
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{ |
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static int hsiztab[] = { |
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251, 509, 1021, 2039, 4093, 8191, 16381, |
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32749, 65521, 131071, 262139, 0 |
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}; |
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int *hsp; |
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|
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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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|
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|
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static int |
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otndx( /* get object table index for name */ |
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char *name, |
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struct ohtab *tab |
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) |
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{ |
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char *onm; |
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OBJECT *oldhtab; |
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int hval, i; |
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int ndx; |
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|
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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 + (unsigned long)i*i) % tab->hsiz; |
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if (tab->htab[ndx] == OVOID) |
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return(ndx); |
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onm = objptr(tab->htab[ndx])->oname; |
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if (onm != NULL && !strcmp(onm, 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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onm = objptr(oldhtab[ndx])->oname; |
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if (onm == NULL) |
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continue; |
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i = otndx(onm, tab); |
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tab->htab[i] = oldhtab[ndx]; |
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} |
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free(oldhtab); |
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goto tryagain; /* should happen only once! */ |
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} |
