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/***
*mblen.c - length of multibyte character
*
* Copyright (c) 1990-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Return the number of bytes contained in a multibyte character.
*
*Revision History:
* 03-19-90 KRS Module created.
* 12-20-90 KRS Include ctype.h.
* 03-20-91 KRS Ported from 16-bit tree.
* 12-09-91 ETC Updated comments; move __mb_cur_max to nlsdata1.c;
* add multithread.
* 06-01-93 CFW Re-write; verify valid MB char, proper error return,
* optimize, correct conversion bug.
* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
* 10-26-93 CFW Test for invalid MB chars using global preset flag.
* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
*
*******************************************************************************/
#ifdef _NTSUBSET_
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#endif
#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <ctype.h>
#include <os2dll.h>
#include <locale.h>
#include <setlocal.h>
#include <assert.h>
/***
*int mblen() - length of multibyte character
*
*Purpose:
* Return the number of bytes contained in a multibyte character.
* [ANSI].
*
*Entry:
* const char *s = pointer to multibyte character
* size_t n = maximum length of multibyte character to consider
*
*Exit:
* If s = NULL, returns 0, indicating we use (only) state-independent
* character encodings.
* If s != NULL, returns: 0 (if *s = null char)
* -1 (if the next n or fewer bytes not valid mbc)
* number of bytes contained in multibyte char
*
*Exceptions:
*
*******************************************************************************/
int _CRTAPI1 mblen
(
const char * s,
size_t n
)
{
assert (MB_CUR_MAX == 1 || MB_CUR_MAX == 2);
if ( !s || !(*s) || (n == 0) )
/* indicate do not have state-dependent encodings,
empty string length is 0 */
return 0;
#if defined(_INTL) && !defined(_NTSUBSET_)
if ( isleadbyte((unsigned char)*s) )
{
/* multi-byte char */
/* verify valid MB char */
if ( MB_CUR_MAX <= 1 || (int)n < MB_CUR_MAX ||
MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, MB_CUR_MAX, NULL, 0) == 0 )
/* bad MB char */
return -1;
else
return MB_CUR_MAX;
}
else {
/* single byte char */
/* verify valid SB char */
if ( MultiByteToWideChar(_lc_codepage, MB_PRECOMPOSED|__invalid_mb_chars,
s, 1, NULL, 0) == 0 )
return -1;
return sizeof(char);
}
#else /* defined(_INTL) && !defined(_NTSUBSET_) */
#ifdef _NTSUBSET_
{
char *s1 = (char *)s;
RtlAnsiCharToUnicodeChar( &s1 );
return s1 - s;
}
#else
return sizeof(char);
#endif
#endif /* _INTL */
}
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