reactos/lib/sdk/crt/mbstring/mbclen.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/sdk/crt/mbstring/mbclen.c
   5  * PURPOSE:      Determines the length of a multi byte character
   6  * PROGRAMERS:
   7  *              Copyright 1999 Alexandre Julliard
   8  *              Copyright 2000 Jon Griffths
   9  *
  10  */
  11
  12 #include <mbstring.h>
  13 #include <stdlib.h>
  14
  15 int isleadbyte(int byte);
  16
  17 /*
  18  * @implemented
  19  */
  20 size_t _mbclen(const unsigned char *s)
  21 {
  22   return _ismbblead(*s) ? 2 : 1;
  23 }
  24
  25 size_t _mbclen2(const unsigned int s)
  26 {
  27   return (_ismbblead(s>>8) && _ismbbtrail(s&0x00FF)) ? 2 : 1;
  28 }
  29
  30 /*
  31  * assume MB_CUR_MAX == 2
  32  *
  33  * @implemented
  34  */
  35 int mblen( const char *str, size_t size )
  36 {
  37   if (str && *str && size)
  38   {
  39     return !isleadbyte(*str) ? 1 : (size>1 ? 2 : -1);
  40   }
  41   return 0;
  42 }