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diff --git a/libraries/liblunicode/ure/ure.h b/libraries/liblunicode/ure/ure.h
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Copyright 1997, 1998, 1999 Computing Research Labs,
+ * New Mexico State University
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * 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 COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY 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.
+ */
+/* $Id: ure.h,v 1.2 1999/09/21 15:47:44 mleisher Exp $ */
+
+#ifndef _h_ure
+#define _h_ure
+
+#include "portable.h"
+
+
+#include <stdio.h>
+
+LDAP_BEGIN_DECL
+
+/*
+ * Set of character class flags.
+ */
+#define _URE_NONSPACING  0x00000001
+#define _URE_COMBINING   0x00000002
+#define _URE_NUMDIGIT    0x00000004
+#define _URE_NUMOTHER    0x00000008
+#define _URE_SPACESEP    0x00000010
+#define _URE_LINESEP     0x00000020
+#define _URE_PARASEP     0x00000040
+#define _URE_CNTRL       0x00000080
+#define _URE_PUA         0x00000100
+
+#define _URE_UPPER       0x00000200
+#define _URE_LOWER       0x00000400
+#define _URE_TITLE       0x00000800
+#define _URE_MODIFIER    0x00001000
+#define _URE_OTHERLETTER 0x00002000
+#define _URE_DASHPUNCT   0x00004000
+#define _URE_OPENPUNCT   0x00008000
+#define _URE_CLOSEPUNCT  0x00010000
+#define _URE_OTHERPUNCT  0x00020000
+#define _URE_MATHSYM     0x00040000
+#define _URE_CURRENCYSYM 0x00080000
+#define _URE_OTHERSYM    0x00100000
+
+#define _URE_LTR         0x00200000
+#define _URE_RTL         0x00400000
+
+#define _URE_EURONUM     0x00800000
+#define _URE_EURONUMSEP  0x01000000
+#define _URE_EURONUMTERM 0x02000000
+#define _URE_ARABNUM     0x04000000
+#define _URE_COMMONSEP   0x08000000
+
+#define _URE_BLOCKSEP    0x10000000
+#define _URE_SEGMENTSEP  0x20000000
+
+#define _URE_WHITESPACE  0x40000000
+#define _URE_OTHERNEUT   0x80000000
+
+/*
+ * Error codes.
+ */
+#define _URE_OK               0
+#define _URE_UNEXPECTED_EOS   -1
+#define _URE_CCLASS_OPEN      -2
+#define _URE_UNBALANCED_GROUP -3
+#define _URE_INVALID_PROPERTY -4
+
+/*
+ * Options that can be combined for searching.
+ */
+#define URE_IGNORE_NONSPACING      0x01
+#define URE_DOT_MATCHES_SEPARATORS 0x02
+
+typedef unsigned long ucs4_t;
+typedef unsigned short ucs2_t;
+
+/*
+ * Opaque type for memory used when compiling expressions.
+ */
+typedef struct _ure_buffer_t *ure_buffer_t;
+
+/*
+ * Opaque type for the minimal DFA used when matching.
+ */
+typedef struct _ure_dfa_t *ure_dfa_t;
+
+/*************************************************************************
+ *
+ * API.
+ *
+ *************************************************************************/
+
+LDAP_LUNICODE_F (ure_buffer_t) ure_buffer_create LDAP_P((void));
+
+LDAP_LUNICODE_F (void) ure_buffer_free LDAP_P((ure_buffer_t buf));
+
+LDAP_LUNICODE_F (ure_dfa_t)
+ure_compile LDAP_P((ucs2_t *re, unsigned long relen,
+		    int casefold, ure_buffer_t buf));
+
+LDAP_LUNICODE_F (void) ure_dfa_free LDAP_P((ure_dfa_t dfa));
+
+LDAP_LUNICODE_F (void) ure_write_dfa LDAP_P((ure_dfa_t dfa, FILE *out));
+
+LDAP_LUNICODE_F (int)
+ure_exec LDAP_P((ure_dfa_t dfa, int flags, ucs2_t *text,
+		 unsigned long textlen, unsigned long *match_start,
+		 unsigned long *match_end));
+
+/*************************************************************************
+ *
+ * Prototypes for stub functions used for URE.  These need to be rewritten to
+ * use the Unicode support available on the system.
+ *
+ *************************************************************************/
+
+LDAP_LUNICODE_F (ucs4_t) _ure_tolower LDAP_P((ucs4_t c));
+
+LDAP_LUNICODE_F (int)
+_ure_matches_properties LDAP_P((unsigned long props, ucs4_t c));
+
+LDAP_END_DECL
+
+#endif /* _h_ure */