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123 lines
3.1 KiB
123 lines
3.1 KiB
/***
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*mblen.c - length of multibyte character
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*
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* Copyright (c) 1990-1995, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Return the number of bytes contained in a multibyte character.
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*
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*Revision History:
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* 03-19-90 KRS Module created.
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* 12-20-90 KRS Include ctype.h.
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* 03-20-91 KRS Ported from 16-bit tree.
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* 12-09-91 ETC Updated comments; move __mb_cur_max to nlsdata1.c;
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* add multithread.
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* 04-06-93 SKS Replace _CRTAPI* with _cdecl
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* 06-01-93 CFW Re-write; verify valid MB char, proper error return,
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* optimize, correct conversion bug.
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* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
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* 09-15-93 CFW Use ANSI conformant "__" names.
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* 09-27-93 GJF Merged NT SDK and Cuda versions.
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* 10-22-93 CFW Test for invalid MB chars using global preset flag.
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* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
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* 09-06-94 CFW Remove _INTL switch.
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* 12-21-94 CFW Remove invalid MB chars NT 3.1 hack.
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* 01-07-95 CFW Mac merge cleanup.
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* 02-06-95 CFW assert -> _ASSERTE.
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*
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*******************************************************************************/
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#if defined(_NTSUBSET_) || defined(_POSIX_)
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#endif
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#ifdef _WIN32
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#include <internal.h>
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#include <locale.h>
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#include <setlocal.h>
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#endif
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#include <cruntime.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <mtdll.h>
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#include <dbgint.h>
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/***
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*int mblen() - length of multibyte character
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*
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*Purpose:
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* Return the number of bytes contained in a multibyte character.
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* [ANSI].
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*
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*Entry:
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* const char *s = pointer to multibyte character
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* size_t n = maximum length of multibyte character to consider
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*
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*Exit:
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* If s = NULL, returns 0, indicating we use (only) state-independent
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* character encodings.
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* If s != NULL, returns: 0 (if *s = null char)
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* -1 (if the next n or fewer bytes not valid mbc)
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* number of bytes contained in multibyte char
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl mblen
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(
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const char * s,
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size_t n
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)
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{
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_ASSERTE (MB_CUR_MAX == 1 || MB_CUR_MAX == 2);
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if ( !s || !(*s) || (n == 0) )
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/* indicate do not have state-dependent encodings,
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empty string length is 0 */
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return 0;
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#if !defined(_NTSUBSET_) && !defined(_POSIX_)
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if ( isleadbyte((unsigned char)*s) )
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{
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/* multi-byte char */
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/* verify valid MB char */
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#ifdef _WIN32
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if ( MB_CUR_MAX <= 1 || (int)n < MB_CUR_MAX ||
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MultiByteToWideChar(__lc_codepage, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
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s, MB_CUR_MAX, NULL, 0) == 0 )
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#else
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/* validate high byte of mbcs char */
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if ((n<(size_t)MB_CUR_MAX) || (!*(s+1)))
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#endif /* _WIN32 */
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/* bad MB char */
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return -1;
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else
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return MB_CUR_MAX;
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}
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else {
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/* single byte char */
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#ifdef _WIN32
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/* verify valid SB char */
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if ( MultiByteToWideChar(__lc_codepage, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
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s, 1, NULL, 0) == 0 )
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return -1;
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#endif /* _WIN32 */
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return sizeof(char);
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}
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#else /* _NTSUBSET_ */
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{
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char *s1 = (char *)s;
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RtlAnsiCharToUnicodeChar( &s1 );
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return s1 - s;
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}
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#endif /* _NTSUBSET_ */
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}
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