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diff --git a/uts/common/sys/u8_textprep.h b/uts/common/sys/u8_textprep.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_U8_TEXTPREP_H
+#define _SYS_U8_TEXTPREP_H
+
+#pragma ident "%Z%%M% %I% %E% SMI"
+
+#include <sys/isa_defs.h>
+#include <sys/types.h>
+#include <sys/errno.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Unicode encoding conversion functions and their macros.
+ */
+#define UCONV_IN_BIG_ENDIAN 0x0001
+#define UCONV_OUT_BIG_ENDIAN 0x0002
+#define UCONV_IN_SYSTEM_ENDIAN 0x0004
+#define UCONV_OUT_SYSTEM_ENDIAN 0x0008
+#define UCONV_IN_LITTLE_ENDIAN 0x0010
+#define UCONV_OUT_LITTLE_ENDIAN 0x0020
+#define UCONV_IGNORE_NULL 0x0040
+#define UCONV_IN_ACCEPT_BOM 0x0080
+#define UCONV_OUT_EMIT_BOM 0x0100
+
+extern int uconv_u16tou32(const uint16_t *, size_t *, uint32_t *, size_t *,
+ int);
+extern int uconv_u16tou8(const uint16_t *, size_t *, uchar_t *, size_t *, int);
+extern int uconv_u32tou16(const uint32_t *, size_t *, uint16_t *, size_t *,
+ int);
+extern int uconv_u32tou8(const uint32_t *, size_t *, uchar_t *, size_t *, int);
+extern int uconv_u8tou16(const uchar_t *, size_t *, uint16_t *, size_t *, int);
+extern int uconv_u8tou32(const uchar_t *, size_t *, uint32_t *, size_t *, int);
+
+/*
+ * UTF-8 text preparation functions and their macros.
+ *
+ * Among the macros defined, U8_CANON_DECOMP, U8_COMPAT_DECOMP, and
+ * U8_CANON_COMP are not public interfaces and must not be used directly
+ * at the flag input argument.
+ */
+#define U8_STRCMP_CS (0x00000001)
+#define U8_STRCMP_CI_UPPER (0x00000002)
+#define U8_STRCMP_CI_LOWER (0x00000004)
+
+#define U8_CANON_DECOMP (0x00000010)
+#define U8_COMPAT_DECOMP (0x00000020)
+#define U8_CANON_COMP (0x00000040)
+
+#define U8_STRCMP_NFD (U8_CANON_DECOMP)
+#define U8_STRCMP_NFC (U8_CANON_DECOMP | U8_CANON_COMP)
+#define U8_STRCMP_NFKD (U8_COMPAT_DECOMP)
+#define U8_STRCMP_NFKC (U8_COMPAT_DECOMP | U8_CANON_COMP)
+
+#define U8_TEXTPREP_TOUPPER (U8_STRCMP_CI_UPPER)
+#define U8_TEXTPREP_TOLOWER (U8_STRCMP_CI_LOWER)
+
+#define U8_TEXTPREP_NFD (U8_STRCMP_NFD)
+#define U8_TEXTPREP_NFC (U8_STRCMP_NFC)
+#define U8_TEXTPREP_NFKD (U8_STRCMP_NFKD)
+#define U8_TEXTPREP_NFKC (U8_STRCMP_NFKC)
+
+#define U8_TEXTPREP_IGNORE_NULL (0x00010000)
+#define U8_TEXTPREP_IGNORE_INVALID (0x00020000)
+#define U8_TEXTPREP_NOWAIT (0x00040000)
+
+#define U8_UNICODE_320 (0)
+#define U8_UNICODE_500 (1)
+#define U8_UNICODE_LATEST (U8_UNICODE_500)
+
+#define U8_VALIDATE_ENTIRE (0x00100000)
+#define U8_VALIDATE_CHECK_ADDITIONAL (0x00200000)
+#define U8_VALIDATE_UCS2_RANGE (0x00400000)
+
+#define U8_ILLEGAL_CHAR (-1)
+#define U8_OUT_OF_RANGE_CHAR (-2)
+
+extern int u8_validate(char *, size_t, char **, int, int *);
+extern int u8_strcmp(const char *, const char *, size_t, int, size_t, int *);
+extern size_t u8_textprep_str(char *, size_t *, char *, size_t *, int, size_t,
+ int *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_U8_TEXTPREP_H */