224 lines
7.5 KiB
C
224 lines
7.5 KiB
C
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/***
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*mbtowc.c - Convert multibyte char to wide char.
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*
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* Copyright (c) 1990-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Convert a multibyte character into the equivalent wide 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 Put some intl stuff here for now...
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* 03-18-91 KRS Fixed bogus cast involving wchar_t. Fix copyright.
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* 03-20-91 KRS Ported from 16-bit tree.
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* 07-22-91 KRS C700 3525: Check for s==0 before calling mblen.
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* 07-23-91 KRS Hard-coded for "C" locale to avoid bogus interim #'s.
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* 10-15-91 ETC Locale support under _INTL (finally!).
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* 12-09-91 ETC Updated nlsapi; added multithread.
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* 08-20-92 KRS Activated NLSAPI support.
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* 08-31-92 SRW Allow INTL definition to be conditional for building ntcrt.lib
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* 09-02-92 SRW Get _INTL definition via ..\crt32.def
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* 04-06-93 SKS Replace _CRTAPI* with _cdecl
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* 04-26-93 CFW Remove unused variable.
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* 05-04-93 CFW Kinder, gentler error handling.
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* 06-01-93 CFW Re-write; verify valid MB char, proper error return,
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* optimize, fix bugs.
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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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* 09-28-93 GJF Merged NT SDK and Cuda versions. Also, replace MTHREAD
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* with _MT.
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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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* 02-03-94 GJF Merged in Steve Wood's latest change (affects
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* _NTSUBSET_ build only).
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* 02-07-94 CFW POSIXify.
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* 09-06-94 CFW Remove _INTL switch.
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* 10-18-94 BWT Fix build warning for call to RtlMultiByteToUnicodeN
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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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* 04-19-95 CFW Rearrange & fix non-Win32 version.
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* 09-26-95 GJF New locking macro, and scheme, for functions which
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* reference the locale.
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* 04-01-96 BWT POSIX work.
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* 06-25-96 GJF Removed DLL_FOR_WIN32S. Replaced defined(_WIN32) with
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* !defined(_MAC). Polished the format a bit.
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* 07-27-98 GJF Revised multithread support based on threadlocinfo
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* struct.
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* 04-07-99 GJF Replace MT with _MT.
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* 05-17-99 PML Remove all Macintosh support.
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* 03-19-01 BWT Fix NTSUBSET to use RtlAnsiCharToUnicodeChar. MultiByteToUnicodeN
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* isn't tolerant of bogus buffers.
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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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#include <cruntime.h>
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#include <stdlib.h>
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#include <mtdll.h>
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#include <errno.h>
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#include <dbgint.h>
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#include <ctype.h>
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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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/***
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*int mbtowc() - Convert multibyte char to wide character.
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*
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*Purpose:
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* Convert a multi-byte character into the equivalent wide character,
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* according to the LC_CTYPE category of the current locale.
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* [ANSI].
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*
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* NOTE: Currently, the C libraries support the "C" locale only.
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* Non-C locale support now available under _INTL switch.
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*Entry:
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* wchar_t *pwc = pointer to destination wide character
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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 only use 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 comprising converted mbc
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl mbtowc(
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wchar_t *pwc,
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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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#ifdef _MT
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pthreadlocinfo ptloci = _getptd()->ptlocinfo;
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if ( ptloci != __ptlocinfo )
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ptloci = __updatetlocinfo();
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return __mbtowc_mt(ptloci, pwc, s, n);
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}
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int __cdecl __mbtowc_mt (
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pthreadlocinfo ptloci,
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wchar_t *pwc,
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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 (ptloci->mb_cur_max == 1 || ptloci->mb_cur_max == 2);
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#else
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_ASSERTE (MB_CUR_MAX == 1 || MB_CUR_MAX == 2);
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#endif
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if ( !s || n == 0 )
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/* indicate do not have state-dependent encodings,
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handle zero length string */
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return 0;
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if ( !*s )
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{
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/* handle NULL char */
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if (pwc)
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*pwc = 0;
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return 0;
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}
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#if !defined(_NTSUBSET_) && !defined (_POSIX_)
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#ifdef _MT
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if ( ptloci->lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#else
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if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#endif
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{
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if (pwc)
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*pwc = (wchar_t)(unsigned char)*s;
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return sizeof(char);
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}
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#ifdef _MT
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if ( __isleadbyte_mt(ptloci, (unsigned char)*s) )
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{
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/* multi-byte char */
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if ( (ptloci->mb_cur_max <= 1) || ((int)n < ptloci->mb_cur_max) ||
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(MultiByteToWideChar( ptloci->lc_codepage,
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MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,
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s,
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ptloci->mb_cur_max,
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pwc,
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(pwc) ? 1 : 0 ) == 0) )
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{
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/* validate high byte of mbcs char */
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if ( (n < (size_t)ptloci->mb_cur_max) || (!*(s + 1)) )
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{
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errno = EILSEQ;
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return -1;
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}
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}
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return ptloci->mb_cur_max;
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}
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#else
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if ( isleadbyte((unsigned char)*s) )
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{
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/* multi-byte char */
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if ( (MB_CUR_MAX <= 1) || ((int)n < MB_CUR_MAX) ||
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(MultiByteToWideChar( __lc_codepage,
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MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,
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s,
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MB_CUR_MAX,
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pwc,
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(pwc) ? 1 : 0 ) == 0) )
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{
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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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{
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errno = EILSEQ;
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return -1;
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}
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}
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return MB_CUR_MAX;
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}
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#endif
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else {
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/* single byte char */
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#ifdef _MT
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if ( MultiByteToWideChar( ptloci->lc_codepage,
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#else
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if ( MultiByteToWideChar( __lc_codepage,
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#endif
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MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,
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s,
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1,
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pwc,
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(pwc) ? 1 : 0 ) == 0 )
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{
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errno = EILSEQ;
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return -1;
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}
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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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*pwc = RtlAnsiCharToUnicodeChar(&s1);
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return((int)(s1-s));
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}
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#endif /* _NTSUBSET_/_POSIX_ */
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}
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