mirror of
https://github.com/Chuyu-Team/VC-LTL5.git
synced 2026-10-18 22:00:51 +08:00
mingkuang
121 lines
3.1 KiB
C++
121 lines
3.1 KiB
C++
/***
|
|
*mbslen_s.c - Find length of MBCS string
|
|
*
|
|
* Copyright (c) Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Find length of MBCS string
|
|
*
|
|
*******************************************************************************/
|
|
#ifndef _MBCS
|
|
#error This file should only be compiled with _MBCS defined
|
|
#endif
|
|
|
|
#include <corecrt_internal.h>
|
|
#include <corecrt_internal_mbstring.h>
|
|
#include <locale.h>
|
|
#include <string.h>
|
|
|
|
/***
|
|
* _mbsnlen - Find length of MBCS string
|
|
*
|
|
*Purpose:
|
|
* Find the length of the MBCS string (in characters).
|
|
*
|
|
*Entry:
|
|
* unsigned char *s = string
|
|
* size_t maxsize
|
|
*
|
|
*Exit:
|
|
* Returns the number of MBCS chars in the string.
|
|
* Only the first sizeInBytes bytes of the string are inspected: if the null
|
|
* terminator is not found, sizeInBytes is returned.
|
|
* If the string is null terminated in sizeInBytes bytes, the return value
|
|
* will always be less than sizeInBytes.
|
|
* Returns (size_t)-1 if something went wrong.
|
|
*
|
|
*Exceptions:
|
|
* Input parameters are validated. Refer to the validation section of the function.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
|
|
size_t __cdecl _mbsnlen_l(
|
|
const unsigned char *s,
|
|
size_t sizeInBytes,
|
|
_locale_t plocinfo
|
|
)
|
|
{
|
|
if (!plocinfo)
|
|
return _mbsnlen(s, sizeInBytes);
|
|
|
|
size_t n, size;
|
|
//_LocaleUpdate _loc_update(plocinfo);
|
|
|
|
if (plocinfo->mbcinfo->ismbcodepage == 0)
|
|
return strnlen((const char *)s, sizeInBytes);
|
|
|
|
/* Note that we do not check if s == nullptr, because we do not
|
|
* return errno_t...
|
|
*/
|
|
|
|
/* Note that sizeInBytes here is the number of bytes, not mb characters! */
|
|
for (n = 0, size = 0; size < sizeInBytes && *s; n++, s++, size++)
|
|
{
|
|
if ( _ismbblead_l(*s, plocinfo) )
|
|
{
|
|
size++;
|
|
if (size >= sizeInBytes)
|
|
{
|
|
break;
|
|
}
|
|
if (*++s == '\0')
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (size >= sizeInBytes ? sizeInBytes : n);
|
|
}
|
|
|
|
_LCRT_DEFINE_IAT_SYMBOL(_mbsnlen_l);
|
|
#endif
|
|
|
|
#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
|
|
size_t __cdecl _mbsnlen(
|
|
const unsigned char *s,
|
|
size_t maxsize
|
|
)
|
|
{
|
|
size_t n, size;
|
|
|
|
if (_getmbcp() == 0)
|
|
return strnlen((const char *)s, maxsize);
|
|
|
|
/* Note that we do not check if s == nullptr, because we do not
|
|
* return errno_t...
|
|
*/
|
|
|
|
/* Note that sizeInBytes here is the number of bytes, not mb characters! */
|
|
for (n = 0, size = 0; size < maxsize && *s; n++, s++, size++)
|
|
{
|
|
if (_ismbblead(*s))
|
|
{
|
|
size++;
|
|
if (size >= maxsize)
|
|
{
|
|
break;
|
|
}
|
|
if (*++s == '\0')
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (size >= maxsize ? maxsize : n);
|
|
}
|
|
|
|
_LCRT_DEFINE_IAT_SYMBOL(_mbsnlen);
|
|
#endif |