Added a StringHashTable type, for later use.

sc2/src/libs/strings/Makeinfo

@@ -1,2 +1,2 @@
-uqm_CFILES="getstr.c sfileins.c sresins.c strings.c unicode.c"
-uqm_HFILES="strintrn.h"
+uqm_CFILES="getstr.c sfileins.c sresins.c stringhashtable.c strings.c unicode.c"
+uqm_HFILES="stringhashtable.c strintrn.h"

sc2/src/libs/strings/stringhashtable.c

@@ -0,0 +1,69 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * Nota bene: later versions of the GNU General Public License do not apply
+ * to this program.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+// A hashtable using strings as indices.
+
+#define HASHTABLE_INTERNAL
+#include "stringhashtable.h"
+#include "types.h"
+#include "libs/misc.h"
+		// For unconst()
+#include "libs/uio/uioport.h"
+
+static inline uio_uint32 StringHashTable_hash(
+		StringHashTable_HashTable *hashTable, const char *string);
+static inline uio_bool StringHashTable_equal(
+		StringHashTable_HashTable *hashTable,
+		const char *key1, const char *key2);
+static inline char *StringHashTable_copy(
+		StringHashTable_HashTable *hashTable, const char *key);
+
+#include "libs/uio/hashtable.c"
+
+
+static inline uio_uint32
+StringHashTable_hash(StringHashTable_HashTable *hashTable, const char *key) {
+	uio_uint32 hash;
+
+	(void) hashTable;
+	// Rotating hash, variation of something on the web which
+	// wasn't original itself.
+	hash = 0;
+			// Hash was on that web page initialised as the length,
+			// but that isn't known at this time.
+	while (*key != '\0') {
+		hash = (hash << 4) ^ (hash >> 28) ^ *key;
+		key++;
+	}
+	return hash ^ (hash >> 10) ^ (hash >> 20);
+}
+
+static inline uio_bool
+StringHashTable_equal(StringHashTable_HashTable *hashTable,
+		const char *key1, const char *key2) {
+	(void) hashTable;
+	return strcmp(key1, key2) == 0;
+}
+
+static inline char *
+StringHashTable_copy(StringHashTable_HashTable *hashTable,
+		const char *key) {
+	(void) hashTable;
+	return unconst(key);
+}
+

sc2/src/libs/strings/stringhashtable.h

@@ -0,0 +1,45 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * Nota bene: later versions of the GNU General Public License do not apply
+ * to this program.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+// A hashtable using strings as indices.
+
+#ifndef _STRINGHASHTABLE_H
+#define _STRINGHASHTABLE_H
+
+// HashTable from 'char *' to STRING.
+// We don't actually copy the index, which means that the caller is
+// responsible for keeping them unchanged during the time that it is used in
+// the hash table.
+
+#include "libs/strlib.h"
+
+#define HASHTABLE_(identifier) StringHashTable ## _ ## identifier
+typedef char HASHTABLE_(Key);
+typedef STRING_TABLE_ENTRY_DESC HASHTABLE_(Value);
+#define StringHashTable_HASH StringHashTable_hash
+#define StringHashTable_EQUAL StringHashTable_equal
+#define StringHashTable_COPY StringHashTable_copy
+#define StringHashTable_FREEKEY(hashTable, key) \
+		((void) (hashTable), (void) (key))
+#define StringHashTable_FREEVALUE(hashTable, value) \
+		((void) (hashTable), (void) (value))
+
+#include "libs/uio/hashtable.h"
+
+
+#endif  /* _STRINGHASHTABLE_H */