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      1 /* Copyright 2016 The Chromium OS Authors. All rights reserved.
      2  * Use of this source code is governed by a BSD-style license that can be
      3  * found in the LICENSE file.
      4  */
      5 
      6 #include <sys/types.h>
      7 
      8 /* Checks if a string is valid UTF-8.
      9  *
     10  * Supports 1 to 4 character UTF-8 sequences. Passes tests here:
     11  *    https://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt
     12  *
     13  * Exceptions: The following unicode non-characters are allowed:
     14  *    U+FFFE, U+FFFF, U+FDD0 - U+FDEF, U+nFFFE (n = 1 - 10),
     15  *    U+nFFFD (n = 1 - 10).
     16  *
     17  * Args:
     18  *    string[in] - a string.
     19  *    bad_pos[out] - position of the first bad character.
     20  *
     21  * Returns:
     22  *    1 if it is a vlid utf-8 string. 0 otherwise.
     23  *    bad_pos contains the strlen() of the string if it is
     24  *    valid.
     25  */
     26 int valid_utf8_string(const char *string, size_t *bad_pos);
     27 
     28 /* Checks if a string is a valid utf-8 string.
     29  *
     30  * Args:
     31  *    string[in] - a string.
     32  *
     33  * Returns:
     34  *    1 if it is a valid utf-8 string. 0 otherwise.
     35  */
     36 int is_utf8_string(const char* string);
     37