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+/* $Id: utf8.h,v 1.1 2000/12/07 00:52:23 tale Exp $ */
+/*
+ * Copyright (c) 2000 Japan Network Information Center.  All rights reserved.
+ *  
+ * By using this file, you agree to the terms and conditions set forth bellow.
+ * 
+ * 			LICENSE TERMS AND CONDITIONS 
+ * 
+ * The following License Terms and Conditions apply, unless a different
+ * license is obtained from Japan Network Information Center ("JPNIC"),
+ * a Japanese association, Fuundo Bldg., 1-2 Kanda Ogawamachi, Chiyoda-ku,
+ * Tokyo, Japan.
+ * 
+ * 1. Use, Modification and Redistribution (including distribution of any
+ *    modified or derived work) in source and/or binary forms is permitted
+ *    under this License Terms and Conditions.
+ * 
+ * 2. Redistribution of source code must retain the copyright notices as they
+ *    appear in each source code file, this License Terms and Conditions.
+ * 
+ * 3. Redistribution in binary form must reproduce the Copyright Notice,
+ *    this License Terms and Conditions, in the documentation and/or other
+ *    materials provided with the distribution.  For the purposes of binary
+ *    distribution the "Copyright Notice" refers to the following language:
+ *    "Copyright (c) Japan Network Information Center.  All rights reserved."
+ * 
+ * 4. Neither the name of JPNIC may be used to endorse or promote products
+ *    derived from this Software without specific prior written approval of
+ *    JPNIC.
+ * 
+ * 5. Disclaimer/Limitation of Liability: THIS SOFTWARE IS PROVIDED BY JPNIC
+ *    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ *    PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL JPNIC BE LIABLE
+ *    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ *    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *    OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *    ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * 6. Indemnification by Licensee
+ *    Any person or entities using and/or redistributing this Software under
+ *    this License Terms and Conditions shall defend indemnify and hold
+ *    harmless JPNIC from and against any and all judgements damages,
+ *    expenses, settlement liabilities, cost and other liabilities of any
+ *    kind as a result of use and redistribution of this Software or any
+ *    claim, suite, action, litigation or proceeding by any third party
+ *    arising out of or relates to this License Terms and Conditions.
+ * 
+ * 7. Governing Law, Jurisdiction and Venue
+ *    This License Terms and Conditions shall be governed by and and
+ *    construed in accordance with the law of Japan. Any person or entities
+ *    using and/or redistributing this Software under this License Terms and
+ *    Conditions hereby agrees and consent to the personal and exclusive
+ *    jurisdiction and venue of Tokyo District Court of Japan.
+ */
+
+#ifndef MDN_UTF8_H
+#define MDN_UTF8_H 1
+
+/*
+ * UTF-8 encoded string facility.
+ */
+
+/*
+ * Get the length of a character.
+ *
+ * Get the length (in bytes) of a character whose first byte is pointed
+ * by 's'.  Since this function only looks one first byte to determine the
+ * length, it is possible some of the following bytes are invalid.
+ */
+extern int
+mdn_utf8_mblen(const char *s);
+
+/*
+ * Get one character.
+ *
+ * Get the first character of the string pointed by 's', and copy it
+ * to 'buf', whose length is 'len'.  Returns the number of bytes copied,
+ * or zero if the encoding is invalid or len is too small.
+ *
+ * The area pointed by 'buf' must be large enough to store any UTF-8 encoded
+ * character.
+ *
+ * Note that the copied string is not NUL-terminated.
+ */
+extern int
+mdn_utf8_getmb(const char *s, size_t len, char *buf);
+
+/*
+ * Get one character in UCS-4.
+ *
+ * Similar to 'mdn_utf8_getmb', except that the result is not in UTF-8
+ * encoding, but in UCS-4 format (plain 32bit integer value).
+ */
+extern int
+mdn_utf8_getwc(const char *s, size_t len, unsigned long *vp);
+
+/*
+ * Put one character.
+ *
+ * This function is an opposite of 'mdn_utf8_getwc'.  It takes a UCS-4
+ * value 'v', convert it to UTF-8 encoded sequence, and store it to 's',
+ * whose length is 'len'.  It returns the number of bytes written, or
+ * zero 'v' is out of range or 'len' is too small.
+ */
+extern int
+mdn_utf8_putwc(char *s, size_t len, unsigned long v);
+
+/*
+ * Check the validity of UTF-8 encoded character.
+ *
+ * Check if the character pointed by 's' is a valid UTF-8 encoded
+ * character.  Return the length of the character (in bytes) if it is valid,
+ * 0 otherwise.
+ */
+extern int
+mdn_utf8_isvalidchar(const char *s);
+
+/*
+ * Check the validity of UTF-8 encoded string.
+ *
+ * Check if the NUL-terminated string 's' is valid as a UTF-8 encoded
+ * string.  Return 1 if it is valid, 0 otherwise.
+ */
+extern int
+mdn_utf8_isvalidstring(const char *s);
+
+/*
+ * Find first byte of a character.
+ *
+ * Find the first byte of a character 's' points to.  's' may point
+ * the 2nd or later byte of a character.  'known_top' is a pointer to
+ * a string which contains 's', and is known to be the first byte of
+ * a character.  If it couldn't find the first byte between 'known_top'
+ * and 's', NULL will be returned.
+ */
+extern char *
+mdn_utf8_findfirstbyte(const char *s, const char *known_top);
+
+#endif /* MDN_UTF8_H */