xref: /reactos/sdk/lib/crt/mbstring/mbstrlen.c (revision c2c66aff) 
1 /*
2  * COPYRIGHT:   See COPYING in the top level directory
3  * PROJECT:     ReactOS system libraries
4  * FILE:        lib/sdk/crt/mbstring/mbstrlen.c
5  * PURPOSE:      Determines the length of a multi byte string, current locale
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 #ifdef _LIBCNT_
16 unsigned short *NlsLeadByteInfo;
17 #define isleadbyte(c) NlsLeadByteInfo[c]
18 #else
19 int isleadbyte(int byte);
20 #endif
21 
22 /*
23  * @implemented
24  */
_mbstrlen(const char * str)25 size_t __cdecl _mbstrlen( const char *str )
26 {
27   size_t len = 0;
28   while(*str)
29   {
30     /* FIXME: According to the documentation we are supposed to test for
31      * multi-byte character validity. Whatever that means
32      */
33     str += isleadbyte((unsigned char)*str) ? 2 : 1;
34     len++;
35   }
36   return len;
37 }
38