huwcampbell.com
Reactos
1/***
2*mbsnccnt.c - Return char count of MBCS string
3*
4* Copyright (c) Microsoft Corporation. All rights reserved.
5*
6*Purpose:
7* Return char count of MBCS string
8*
9*******************************************************************************/
10#ifndef _MBCS
11 #error This file should only be compiled with _MBCS defined
12#endif
13
14#include <corecrt_internal_mbstring.h>
15#include <locale.h>
16
17/***
18* _mbsnccnt - Return char count of MBCS string
19*
20*Purpose:
21* Returns the number of chars between the start of the supplied
22* string and the byte count supplied. That is, this routine
23* indicates how many chars are in the first "bcnt" bytes
24* of the string.
25*
26*Entry:
27* const unsigned char *string = pointer to string
28* unsigned int bcnt = number of bytes to scan
29*
30*Exit:
31* Returns number of chars between string and bcnt.
32*
33* If the end of the string is encountered before bcnt chars were
34* scanned, then the length of the string in chars is returned.
35*
36*Exceptions:
37* Input parameters are validated. Refer to the validation section of the function.
38*
39*******************************************************************************/
40
41extern "C" size_t __cdecl _mbsnccnt_l(
42 const unsigned char *string,
43 size_t bcnt,
44 _locale_t plocinfo
45 )
46{
47 size_t n;
48 _LocaleUpdate _loc_update(plocinfo);
49
50 _VALIDATE_RETURN(string != nullptr || bcnt == 0, EINVAL, 0);
51
52 for (n = 0; (bcnt-- && *string); n++, string++) {
53 if ( _ismbblead_l(*string, _loc_update.GetLocaleT()) ) {
54 if ( (!bcnt--) || (*++string == '\0'))
55 break;
56 }
57 }
58
59 return(n);
60}
61extern "C" size_t (__cdecl _mbsnccnt)(
62 const unsigned char *string,
63 size_t bcnt
64 )
65{
66 return _mbsnccnt_l(string, bcnt, nullptr);
67}