178 lines
5.5 KiB
C
178 lines
5.5 KiB
C
/***
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*wctomb.c - Convert wide character to multibyte character.
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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 wide character into the equivalent 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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* 01-14-91 KRS Fix argument error: wchar is pass-by-value.
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* 03-20-91 KRS Ported from 16-bit tree.
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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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* 08-22-92 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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* 05-04-93 CFW Kinder, gentler error handling.
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* 06-01-93 CFW Minor optimization and beautify.
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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.
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* 01-14-94 SRW if _NTSUBSET_ defined call Rtl functions
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* 02-07-94 CFW POSIXify.
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* 09-06-94 CFW Remove _INTL switch.
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* 01-07-95 CFW Mac merge cleanup.
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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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* 12-07-95 SKS Fix misspelling of _NTSUBSET_ (final _ was missing)
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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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* 07-22-98 GJF Revised multithread support based on threadlocinfo
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* struct.
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* 04-28-99 GJF Changed dwFlags arg value to 0 in WideCharToMultiByte
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* calls to avoid problems with codepage 1258 on NT 5.0.
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* 05-17-99 PML Remove all Macintosh support.
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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 <locale.h>
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#include <setlocal.h>
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/***
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*int wctomb() - Convert wide character to multibyte character.
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*
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*Purpose:
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* Convert a wide character into the equivalent multi-byte 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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* char *s = pointer to multibyte character
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* wchar_t wchar = source wide character
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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:
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* -1 (if error) or number of bytes comprising
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* 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 wctomb (
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char *s,
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wchar_t wchar
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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 __wctomb_mt(ptloci, s, wchar);
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}
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int __cdecl __wctomb_mt (
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pthreadlocinfo ptloci,
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char *s,
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wchar_t wchar
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)
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{
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#endif
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if ( !s )
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/* indicate do not have state-dependent encodings */
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return 0;
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#if defined(_NTSUBSET_) || defined(_POSIX_)
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{
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NTSTATUS Status;
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int size;
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Status = RtlUnicodeToMultiByteN( s,
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MB_CUR_MAX,
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(PULONG)&size,
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&wchar,
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sizeof( wchar )
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);
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if (!NT_SUCCESS(Status))
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{
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errno = EILSEQ;
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size = -1;
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}
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return size;
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}
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#else /* _NTSUBSET_/_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 ( wchar > 255 ) /* validate high byte */
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{
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errno = EILSEQ;
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return -1;
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}
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*s = (char) wchar;
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return sizeof(char);
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}
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else
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{
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int size;
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BOOL defused = 0;
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#ifdef _MT
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if ( ((size = WideCharToMultiByte( ptloci->lc_codepage,
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#else
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if ( ((size = WideCharToMultiByte( __lc_codepage,
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#endif
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0,
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&wchar,
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1,
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s,
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#ifdef _MT
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ptloci->mb_cur_max,
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#else
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MB_CUR_MAX,
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#endif
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NULL,
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&defused) ) == 0) ||
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(defused) )
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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 size;
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}
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#endif /* ! _NTSUBSET_/_POSIX_ */
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}
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