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 <precomp.h>
  13 #include <mbstring.h>
  14
  15 /*
  16  * @implemented
  17  */
  18 size_t _mbclen(const unsigned char *s)
  19 {
  20   return _ismbblead(*s) ? 2 : 1;
  21 }
  22
  23 size_t _mbclen2(const unsigned int s)
  24 {
  25   return (_ismbblead(s>>8) && _ismbbtrail(s&0x00FF)) ? 2 : 1;
  26 }
  27
  28 /*
  29  * assume MB_CUR_MAX == 2
  30  *
  31  * @implemented
  32  */
  33 int mblen( const char *str, size_t size )
  34 {
  35   if (str && *str && size)
  36   {
  37     return !isleadbyte((unsigned char)*str) ? 1 : (size>1 ? 2 : -1);
  38   }
  39   return 0;
  40 }
  41
  42 size_t __cdecl mbrlen(const char *str, size_t len, mbstate_t *state)
  43 {
  44     mbstate_t s = (state ? *state : 0);
  45     size_t ret;
  46
  47     if(!len || !str || !*str)
  48         return 0;
  49
  50     if(get_locinfo()->mb_cur_max == 1) {
  51         return 1;
  52     }else if(!s && isleadbyte((unsigned char)*str)) {
  53         if(len == 1) {
  54             s = (unsigned char)*str;
  55             ret = -2;
  56         }else {
  57             ret = 2;
  58         }
  59     }else if(!s) {
  60         ret = 1;
  61     }else {
  62         s = 0;
  63         ret = 2;
  64     }
  65
  66     if(state)
  67         *state = s;
  68     return ret;
  69 }
  70