xref: /reactos/sdk/lib/crt/mbstring/mbclen.c (revision c2c66aff) 
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  */
_mbclen(const unsigned char * s)18 size_t _mbclen(const unsigned char *s)
19 {
20   return _ismbblead(*s) ? 2 : 1;
21 }
22 
_mbclen2(const unsigned int s)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  */
mblen(const char * str,size_t size)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 
mbrlen(const char * str,size_t len,mbstate_t * state)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 
71