96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/***
|
|
*_mbslen.c - Return number of multibyte characters in a multibyte string
|
|
*
|
|
* Copyright (c) Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Return number of multibyte characters in a multibyte string
|
|
* excluding the terminal null. Locale-dependent.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <stdlib.h>
|
|
#include <locale.h>
|
|
#include <dbgint.h>
|
|
#include <ctype.h>
|
|
#include <mbctype.h>
|
|
#include <internal.h>
|
|
#include <mtdll.h>
|
|
#include <setlocal.h>
|
|
|
|
/***
|
|
*_mbstrlen - Return number of multibyte characters in a multibyte string
|
|
*
|
|
*Purpose:
|
|
* Return number of multibyte characters in a multibyte string
|
|
* excluding the terminal null. Locale-dependent.
|
|
*
|
|
*Entry:
|
|
* char *s = string
|
|
*
|
|
*Exit:
|
|
* Returns the number of multibyte characters in the string, or
|
|
* Returns (size_t)-1 if the string contains an invalid multibyte character.
|
|
* Also, errno is set to EILSEQ.
|
|
*
|
|
*Exceptions:
|
|
* Input parameters are validated. Refer to the validation section of the function.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
size_t __cdecl _mbstrlen_l(
|
|
const char *s,
|
|
_locale_t plocinfo
|
|
)
|
|
{
|
|
size_t n;
|
|
_LocaleUpdate _loc_update(plocinfo);
|
|
|
|
_ASSERTE (_loc_update.GetLocaleT()->locinfo->mb_cur_max == 1 || _loc_update.GetLocaleT()->locinfo->mb_cur_max == 2);
|
|
|
|
if ( _loc_update.GetLocaleT()->locinfo->mb_cur_max == 1 )
|
|
/* handle single byte character sets */
|
|
return strlen(s);
|
|
|
|
|
|
/* verify all valid MB chars */
|
|
if ( MultiByteToWideChar( _loc_update.GetLocaleT()->locinfo->lc_codepage,
|
|
MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,
|
|
s,
|
|
-1,
|
|
NULL,
|
|
0 ) == 0 )
|
|
{
|
|
/* bad MB char */
|
|
errno = EILSEQ;
|
|
return (size_t)-1;
|
|
}
|
|
|
|
/* count MB chars */
|
|
for (n = 0; *s; n++, s++) {
|
|
if ( _isleadbyte_l((unsigned char)*s, _loc_update.GetLocaleT()) )
|
|
{
|
|
if (*++s == '\0')
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
return(n);
|
|
}
|
|
|
|
size_t __cdecl _mbstrlen(
|
|
const char *s
|
|
)
|
|
{
|
|
if (__locale_changed == 0)
|
|
{
|
|
return strlen(s);
|
|
}
|
|
else
|
|
{
|
|
return _mbstrlen_l(s, NULL);
|
|
}
|
|
}
|