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+/* $Xorg: Quarks.c,v 1.5 2001/02/09 02:03:35 xorgcvs Exp $ */
+
+/***********************************************************
+Copyright 1987, 1988, 1990 by Digital Equipment Corporation, Maynard,
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+/*
+
+Copyright 1987, 1988, 1990, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+/* $XFree86: xc/lib/X11/Quarks.c,v 1.6 2003/04/13 19:22:17 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include <X11/Xresource.h>
+#include "Xresinternal.h"
+
+/* Not cost effective, at least for vanilla MIT clients */
+/* #define PERMQ */
+
+#ifdef PERMQ
+typedef unsigned char Bits;
+#endif
+typedef unsigned long Entry; /* dont confuse with EntryRec from Xintatom.h */
+
+static XrmQuark nextQuark = 1; /* next available quark number */
+static unsigned long quarkMask = 0;
+static Entry zero = 0;
+static Entry *quarkTable = &zero; /* crock */
+static unsigned long quarkRehash;
+static XrmString **stringTable = NULL;
+#ifdef PERMQ
+static Bits **permTable = NULL;
+#endif
+static XrmQuark nextUniq = -1; /* next quark from XrmUniqueQuark */
+
+#define QUANTUMSHIFT 8
+#define QUANTUMMASK ((1 << QUANTUMSHIFT) - 1)
+#define CHUNKPER 8
+#define CHUNKMASK ((CHUNKPER << QUANTUMSHIFT) - 1)
+
+#define LARGEQUARK ((Entry)0x80000000L)
+#define QUARKSHIFT 18
+#define QUARKMASK ((LARGEQUARK - 1) >> QUARKSHIFT)
+#define XSIGMASK ((1L << QUARKSHIFT) - 1)
+
+#define STRQUANTSIZE (sizeof(XrmString) * (QUANTUMMASK + 1))
+#ifdef PERMQ
+#define QUANTSIZE (STRQUANTSIZE + \
+ (sizeof(Bits) * ((QUANTUMMASK + 1) >> 3))
+#else
+#define QUANTSIZE STRQUANTSIZE
+#endif
+
+#define HASH(sig) ((sig) & quarkMask)
+#define REHASHVAL(sig) ((((sig) % quarkRehash) + 2) | 1)
+#define REHASH(idx,rehash) ((idx + rehash) & quarkMask)
+#define NAME(q) stringTable[(q) >> QUANTUMSHIFT][(q) & QUANTUMMASK]
+#ifdef PERMQ
+#define BYTEREF(q) permTable[(q) >> QUANTUMSHIFT][((q) & QUANTUMMASK) >> 3]
+#define ISPERM(q) (BYTEREF(q) & (1 << ((q) & 7)))
+#define SETPERM(q) BYTEREF(q) |= (1 << ((q) & 7))
+#define CLEARPERM(q) BYTEREF(q) &= ~(1 << ((q) & 7))
+#endif
+
+/* Permanent memory allocation */
+
+#define WALIGN sizeof(unsigned long)
+#define DALIGN sizeof(double)
+
+#define NEVERFREETABLESIZE ((8192-12) & ~(DALIGN-1))
+static char *neverFreeTable = NULL;
+static int neverFreeTableSize = 0;
+
+static char *permalloc(unsigned int length)
+{
+ char *ret;
+
+ if (neverFreeTableSize < length) {
+ if (length >= NEVERFREETABLESIZE)
+ return Xmalloc(length);
+ if (! (ret = Xmalloc(NEVERFREETABLESIZE)))
+ return (char *) NULL;
+ neverFreeTableSize = NEVERFREETABLESIZE;
+ neverFreeTable = ret;
+ }
+ ret = neverFreeTable;
+ neverFreeTable += length;
+ neverFreeTableSize -= length;
+ return(ret);
+}
+
+#ifndef WORD64
+typedef struct {char a; double b;} TestType1;
+typedef struct {char a; unsigned long b;} TestType2;
+#endif
+
+#ifdef XTHREADS
+static char *_Xpermalloc(unsigned int length);
+
+char *Xpermalloc(unsigned int length)
+{
+ char *p;
+
+ _XLockMutex(_Xglobal_lock);
+ p = _Xpermalloc(length);
+ _XUnlockMutex(_Xglobal_lock);
+ return p;
+}
+#define Xpermalloc _Xpermalloc
+
+static
+#endif /* XTHREADS */
+char *Xpermalloc(unsigned int length)
+{
+ int i;
+
+ if (neverFreeTableSize && length < NEVERFREETABLESIZE) {
+#ifndef WORD64
+ if ((sizeof(TestType1) !=
+ (sizeof(TestType2) - sizeof(unsigned long) + sizeof(double))) &&
+ !(length & (DALIGN-1)) &&
+ ((i = (NEVERFREETABLESIZE - neverFreeTableSize) & (DALIGN-1)))) {
+ neverFreeTableSize -= DALIGN - i;
+ neverFreeTable += DALIGN - i;
+ } else
+#endif
+ if ((i = (NEVERFREETABLESIZE - neverFreeTableSize) & (WALIGN-1))) {
+ neverFreeTableSize -= WALIGN - i;
+ neverFreeTable += WALIGN - i;
+ }
+ }
+ return permalloc(length);
+}
+
+static Bool
+ExpandQuarkTable(void)
+{
+ unsigned long oldmask, newmask;
+ register char c, *s;
+ register Entry *oldentries, *entries;
+ register Entry entry;
+ register int oldidx, newidx, rehash;
+ Signature sig;
+ XrmQuark q;
+
+ oldentries = quarkTable;
+ if ((oldmask = quarkMask))
+ newmask = (oldmask << 1) + 1;
+ else {
+ if (!stringTable) {
+ stringTable = (XrmString **)Xmalloc(sizeof(XrmString *) *
+ CHUNKPER);
+ if (!stringTable)
+ return False;
+ stringTable[0] = (XrmString *)NULL;
+ }
+#ifdef PERMQ
+ if (!permTable)
+ permTable = (Bits **)Xmalloc(sizeof(Bits *) * CHUNKPER);
+ if (!permTable)
+ return False;
+#endif
+ stringTable[0] = (XrmString *)Xpermalloc(QUANTSIZE);
+ if (!stringTable[0])
+ return False;
+#ifdef PERMQ
+ permTable[0] = (Bits *)((char *)stringTable[0] + STRQUANTSIZE);
+#endif
+ newmask = 0x1ff;
+ }
+ entries = (Entry *)Xmalloc(sizeof(Entry) * (newmask + 1));
+ if (!entries)
+ return False;
+ bzero((char *)entries, sizeof(Entry) * (newmask + 1));
+ quarkTable = entries;
+ quarkMask = newmask;
+ quarkRehash = quarkMask - 2;
+ for (oldidx = 0; oldidx <= oldmask; oldidx++) {
+ if ((entry = oldentries[oldidx])) {
+ if (entry & LARGEQUARK)
+ q = entry & (LARGEQUARK-1);
+ else
+ q = (entry >> QUARKSHIFT) & QUARKMASK;
+ for (sig = 0, s = NAME(q); (c = *s++); )
+ sig = (sig << 1) + c;
+ newidx = HASH(sig);
+ if (entries[newidx]) {
+ rehash = REHASHVAL(sig);
+ do {
+ newidx = REHASH(newidx, rehash);
+ } while (entries[newidx]);
+ }
+ entries[newidx] = entry;
+ }
+ }
+ if (oldmask)
+ Xfree((char *)oldentries);
+ return True;
+}
+
+XrmQuark
+_XrmInternalStringToQuark(
+ register _Xconst char *name, register int len, register Signature sig,
+ Bool permstring)
+{
+ register XrmQuark q;
+ register Entry entry;
+ register int idx, rehash;
+ register int i;
+ register char *s1, *s2;
+ char *new;
+
+ rehash = 0;
+ idx = HASH(sig);
+ _XLockMutex(_Xglobal_lock);
+ while ((entry = quarkTable[idx])) {
+ if (entry & LARGEQUARK)
+ q = entry & (LARGEQUARK-1);
+ else {
+ if ((entry - sig) & XSIGMASK)
+ goto nomatch;
+ q = (entry >> QUARKSHIFT) & QUARKMASK;
+ }
+ for (i = len, s1 = (char *)name, s2 = NAME(q); --i >= 0; ) {
+ if (*s1++ != *s2++)
+ goto nomatch;
+ }
+ if (*s2) {
+nomatch: if (!rehash)
+ rehash = REHASHVAL(sig);
+ idx = REHASH(idx, rehash);
+ continue;
+ }
+#ifdef PERMQ
+ if (permstring && !ISPERM(q)) {
+ Xfree(NAME(q));
+ NAME(q) = (char *)name;
+ SETPERM(q);
+ }
+#endif
+ _XUnlockMutex(_Xglobal_lock);
+ return q;
+ }
+ if (nextUniq == nextQuark)
+ goto fail;
+ if ((nextQuark + (nextQuark >> 2)) > quarkMask) {
+ if (!ExpandQuarkTable())
+ goto fail;
+ _XUnlockMutex(_Xglobal_lock);
+ return _XrmInternalStringToQuark(name, len, sig, permstring);
+ }
+ q = nextQuark;
+ if (!(q & QUANTUMMASK)) {
+ if (!(q & CHUNKMASK)) {
+ if (!(new = Xrealloc((char *)stringTable,
+ sizeof(XrmString *) *
+ ((q >> QUANTUMSHIFT) + CHUNKPER))))
+ goto fail;
+ stringTable = (XrmString **)new;
+#ifdef PERMQ
+ if (!(new = Xrealloc((char *)permTable,
+ sizeof(Bits *) *
+ ((q >> QUANTUMSHIFT) + CHUNKPER))))
+ goto fail;
+ permTable = (Bits **)new;
+#endif
+ }
+ new = Xpermalloc(QUANTSIZE);
+ if (!new)
+ goto fail;
+ stringTable[q >> QUANTUMSHIFT] = (XrmString *)new;
+#ifdef PERMQ
+ permTable[q >> QUANTUMSHIFT] = (Bits *)(new + STRQUANTSIZE);
+#endif
+ }
+ if (!permstring) {
+ s2 = (char *)name;
+#ifdef PERMQ
+ name = Xmalloc(len+1);
+#else
+ name = permalloc(len+1);
+#endif
+ if (!name)
+ goto fail;
+ for (i = len, s1 = (char *)name; --i >= 0; )
+ *s1++ = *s2++;
+ *s1++ = '\0';
+#ifdef PERMQ
+ CLEARPERM(q);
+ }
+ else {
+ SETPERM(q);
+#endif
+ }
+ NAME(q) = (char *)name;
+ if (q <= QUARKMASK)
+ entry = (q << QUARKSHIFT) | (sig & XSIGMASK);
+ else
+ entry = q | LARGEQUARK;
+ quarkTable[idx] = entry;
+ nextQuark++;
+ _XUnlockMutex(_Xglobal_lock);
+ return q;
+ fail:
+ _XUnlockMutex(_Xglobal_lock);
+ return NULLQUARK;
+}
+
+XrmQuark
+XrmStringToQuark(
+ _Xconst char *name)
+{
+ register char c, *tname;
+ register Signature sig = 0;
+
+ if (!name)
+ return (NULLQUARK);
+
+ for (tname = (char *)name; (c = *tname++); )
+ sig = (sig << 1) + c;
+
+ return _XrmInternalStringToQuark(name, tname-(char *)name-1, sig, False);
+}
+
+XrmQuark
+XrmPermStringToQuark(
+ _Xconst char *name)
+{
+ register char c, *tname;
+ register Signature sig = 0;
+
+ if (!name)
+ return (NULLQUARK);
+
+ for (tname = (char *)name; (c = *tname++); )
+ sig = (sig << 1) + c;
+
+ return _XrmInternalStringToQuark(name, tname-(char *)name-1, sig, True);
+}
+
+XrmQuark XrmUniqueQuark(void)
+{
+ XrmQuark q;
+
+ _XLockMutex(_Xglobal_lock);
+ if (nextUniq == nextQuark)
+ q = NULLQUARK;
+ else
+ q = nextUniq--;
+ _XUnlockMutex(_Xglobal_lock);
+ return q;
+}
+
+XrmString XrmQuarkToString(register XrmQuark quark)
+{
+ XrmString s;
+
+ _XLockMutex(_Xglobal_lock);
+ if (quark <= 0 || quark >= nextQuark)
+ s = NULLSTRING;
+ else {
+#ifdef PERMQ
+ /* We have to mark the quark as permanent, since the caller might hold
+ * onto the string pointer forver.
+ */
+ SETPERM(quark);
+#endif
+ s = NAME(quark);
+ }
+ _XUnlockMutex(_Xglobal_lock);
+ return s;
+}
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