aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/lib/font/util/atom.c
diff options
context:
space:
mode:
Diffstat (limited to 'nx-X11/lib/font/util/atom.c')
-rw-r--r--nx-X11/lib/font/util/atom.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/nx-X11/lib/font/util/atom.c b/nx-X11/lib/font/util/atom.c
new file mode 100644
index 000000000..942ea0d46
--- /dev/null
+++ b/nx-X11/lib/font/util/atom.c
@@ -0,0 +1,233 @@
+/* $Xorg: atom.c,v 1.5 2001/02/09 02:04:04 xorgcvs Exp $ */
+
+/*
+
+Copyright 1990, 1994, 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/font/util/atom.c,v 1.9 2002/09/19 13:22:00 tsi Exp $ */
+
+/*
+ * Author: Keith Packard, MIT X Consortium
+ */
+
+/* lame atom replacement routines for font applications */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/fonts/fontmisc.h>
+
+typedef struct _AtomList {
+ char *name;
+ int len;
+ int hash;
+ Atom atom;
+} AtomListRec, *AtomListPtr;
+
+static AtomListPtr *hashTable;
+
+static int hashSize, hashUsed;
+static int hashMask;
+static int rehash;
+
+static AtomListPtr *reverseMap;
+static int reverseMapSize;
+static Atom lastAtom;
+
+static int
+Hash(char *string, int len)
+{
+ int h;
+
+ h = 0;
+ while (len--)
+ h = (h << 3) ^ *string++;
+ if (h < 0)
+ return -h;
+ return h;
+}
+
+static int
+ResizeHashTable (void)
+{
+ int newHashSize;
+ int newHashMask;
+ AtomListPtr *newHashTable;
+ int i;
+ int h;
+ int newRehash;
+ int r;
+
+ if (hashSize == 0)
+ newHashSize = 1024;
+ else
+ newHashSize = hashSize * 2;
+ newHashTable = (AtomListPtr *) xalloc (newHashSize * sizeof (AtomListPtr));
+ if (!newHashTable) {
+ fprintf(stderr, "ResizeHashTable(): Error: Couldn't allocate"
+ " newHashTable (%ld)\n",
+ newHashSize * (unsigned long)sizeof (AtomListPtr));
+ return FALSE;
+ }
+ bzero ((char *) newHashTable, newHashSize * sizeof (AtomListPtr));
+ newHashMask = newHashSize - 1;
+ newRehash = (newHashMask - 2);
+ for (i = 0; i < hashSize; i++)
+ {
+ if (hashTable[i])
+ {
+ h = (hashTable[i]->hash) & newHashMask;
+ if (newHashTable[h])
+ {
+ r = hashTable[i]->hash % newRehash | 1;
+ do {
+ h += r;
+ if (h >= newHashSize)
+ h -= newHashSize;
+ } while (newHashTable[h]);
+ }
+ newHashTable[h] = hashTable[i];
+ }
+ }
+ xfree (hashTable);
+ hashTable = newHashTable;
+ hashSize = newHashSize;
+ hashMask = newHashMask;
+ rehash = newRehash;
+ return TRUE;
+}
+
+static int
+ResizeReverseMap (void)
+{
+ int ret = TRUE;
+ if (reverseMapSize == 0)
+ reverseMapSize = 1000;
+ else
+ reverseMapSize *= 2;
+ reverseMap = (AtomListPtr *) xrealloc (reverseMap, reverseMapSize * sizeof (AtomListPtr));
+ if (!reverseMap) {
+ fprintf(stderr, "ResizeReverseMap(): Error: Couldn't reallocate"
+ " reverseMap (%ld)\n",
+ reverseMapSize * (unsigned long)sizeof(AtomListPtr));
+ ret = FALSE;
+ }
+ return ret;
+}
+
+static int
+NameEqual (const char *a, const char *b, int l)
+{
+ while (l--)
+ if (*a++ != *b++)
+ return FALSE;
+ return TRUE;
+}
+
+Atom
+MakeAtom(char *string, unsigned len, int makeit)
+{
+ AtomListPtr a;
+ int hash;
+ int h = 0;
+ int r;
+
+ hash = Hash (string, len);
+ if (hashTable)
+ {
+ h = hash & hashMask;
+ if (hashTable[h])
+ {
+ if (hashTable[h]->hash == hash && hashTable[h]->len == len &&
+ NameEqual (hashTable[h]->name, string, len))
+ {
+ return hashTable[h]->atom;
+ }
+ r = (hash % rehash) | 1;
+ for (;;)
+ {
+ h += r;
+ if (h >= hashSize)
+ h -= hashSize;
+ if (!hashTable[h])
+ break;
+ if (hashTable[h]->hash == hash && hashTable[h]->len == len &&
+ NameEqual (hashTable[h]->name, string, len))
+ {
+ return hashTable[h]->atom;
+ }
+ }
+ }
+ }
+ if (!makeit)
+ return None;
+ a = (AtomListPtr) xalloc (sizeof (AtomListRec) + len + 1);
+ if (a == NULL) {
+ fprintf(stderr, "MakeAtom(): Error: Couldn't allocate AtomListRec"
+ " (%ld)\n", (unsigned long)sizeof (AtomListRec) + len + 1);
+ return None;
+ }
+ a->name = (char *) (a + 1);
+ a->len = len;
+ strncpy (a->name, string, len);
+ a->name[len] = '\0';
+ a->atom = ++lastAtom;
+ a->hash = hash;
+ if (hashUsed >= hashSize / 2)
+ {
+ ResizeHashTable ();
+ h = hash & hashMask;
+ if (hashTable[h])
+ {
+ r = (hash % rehash) | 1;
+ do {
+ h += r;
+ if (h >= hashSize)
+ h -= hashSize;
+ } while (hashTable[h]);
+ }
+ }
+ hashTable[h] = a;
+ hashUsed++;
+ if (reverseMapSize <= a->atom) {
+ if (!ResizeReverseMap())
+ return None;
+ }
+ reverseMap[a->atom] = a;
+ return a->atom;
+}
+
+int
+ValidAtom(Atom atom)
+{
+ return (atom != None) && (atom <= lastAtom);
+}
+
+char *
+NameForAtom(Atom atom)
+{
+ if (atom != None && atom <= lastAtom)
+ return reverseMap[atom]->name;
+ return NULL;
+}