175 lines
5.8 KiB
C
175 lines
5.8 KiB
C
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/***
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*wcsxfrm.c - Transform a wide-character string using locale information
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*
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* Copyright (c) 1988-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Transform a wide-character string using the locale information as set by
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* LC_COLLATE.
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*
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*Revision History:
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* 09-09-91 ETC Created from strxfrm.c.
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* 12-09-91 ETC Updated api; Added multithread lock.
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* 12-18-91 ETC Changed back LCMAP_SORTKEYA --> LCMAP_SORTKEY.
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* 04-06-92 KRS Fix so it works without _INTL too.
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* 08-19-92 KRS Activate use of NLS API.
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* 09-02-92 SRW Get _INTL definition via ..\crt32.def
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* 12-15-92 KRS Fix return value to match ANSI/ISO Std.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-15-93 CFW Use ANSI conformant "__" names.
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* 09-22-93 CFW Use __crtxxx internal NLS API wrapper.
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* 09-23-93 CFW Complete re-write. Non-C locale totally broken.
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* 11-09-93 CFW Use LC_COLLATE code page for __crtxxx() conversion.
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* 02-07-94 CFW POSIXify.
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* 09-06-94 CFW Remove _INTL switch.
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* 10-25-94 GJF Sped up C locale, multi-thread case.
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* 01-10-95 CFW Debug CRT allocs.
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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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* 10-11-95 BWT Fix NTSUBSET
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* 11-24-97 GJF Removed bogus codepage determination.
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* 01-12-98 GJF Use _lc_collate_cp codepage.
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* 07-16-98 GJF Revised multithread support based on threadlocinfo
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* struct. Also, use _alloca instead of _malloc_crt if
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* possible.
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* 01-04-99 GJF Changes for 64-bit size_t.
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* 04-30-99 PML Minor cleanup as part of 64-bit merge.
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* 12-10-99 GB Added support for recovery from stack overflow around
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* _alloca().
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* 10-12-00 GB Changed the function to be similar to strxfrm()
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <windows.h>
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#include <string.h>
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#include <limits.h>
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#include <locale.h>
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#include <setlocal.h>
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#include <stdlib.h>
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#include <mtdll.h>
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#include <awint.h>
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#include <dbgint.h>
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#include <malloc.h>
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/***
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*size_t wcsxfrm() - Transform a string using locale information
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*
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*Purpose:
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* Transform the wide string pointed to by _string2 and place the
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* resulting wide string into the array pointed to by _string1.
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* No more than _count wide characters are placed into the
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* resulting string (including the null).
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*
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* The transformation is such that if wcscmp() is applied to
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* the two transformed strings, the return value is equal to
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* the result of wcscoll() applied to the two original strings.
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* Thus, the conversion must take the locale LC_COLLATE info
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* into account.
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*
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* In the C locale, wcsxfrm() simply resolves to wcsncpy()/wcslen().
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*
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*Entry:
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* wchar_t *_string1 = result string
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* const wchar_t *_string2 = source string
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* size_t _count = max wide chars to move
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*
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* [If _count is 0, _string1 is permitted to be NULL.]
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*
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*Exit:
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* Length of the transformed string (not including the terminating
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* null). If the value returned is >= _count, the contents of the
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* _string1 array are indeterminate.
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*
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*Exceptions:
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* Non-standard: if OM/API error, return INT_MAX.
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*
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*******************************************************************************/
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size_t __cdecl wcsxfrm (
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wchar_t *_string1,
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const wchar_t *_string2,
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size_t _count
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)
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{
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#ifdef _NTSUBSET_
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if (_string1)
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wcsncpy(_string1, _string2, _count);
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return wcslen(_string2);
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#else
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int size = INT_MAX;
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#ifdef _MT
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pthreadlocinfo ptloci;
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#endif
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if ( _count > INT_MAX )
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return (size_t)size;
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#ifdef _MT
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ptloci = _getptd()->ptlocinfo;
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if ( ptloci != __ptlocinfo )
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ptloci = __updatetlocinfo();
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if ( ptloci->lc_handle[LC_COLLATE] == _CLOCALEHANDLE )
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#else
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if ( __lc_handle[LC_COLLATE] == _CLOCALEHANDLE )
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#endif
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{
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wcsncpy(_string1, _string2, _count);
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return wcslen(_string2);
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}
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#ifdef _MT
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if ( 0 == (size = __crtLCMapStringW( ptloci->lc_handle[LC_COLLATE],
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#else
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if ( 0 == (size = __crtLCMapStringW( __lc_handle[LC_COLLATE],
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#endif
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LCMAP_SORTKEY,
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_string2,
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-1,
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NULL,
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0,
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#ifdef _MT
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ptloci->lc_collate_cp )) )
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#else
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__lc_collate_cp )) )
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#endif
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{
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size = INT_MAX;
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} else
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{
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if ( (size_t)size <= _count)
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{
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#ifdef _MT
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if ( 0 == (size = __crtLCMapStringW( ptloci->lc_handle[LC_COLLATE],
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#else
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if ( 0 == (size = __crtLCMapStringW( __lc_handle[LC_COLLATE],
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#endif
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LCMAP_SORTKEY,
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_string2,
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-1,
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(wchar_t *)_string1,
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(int)_count,
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#ifdef _MT
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ptloci->lc_collate_cp )) )
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#else
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__lc_collate_cp )) )
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#endif
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{
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size = INT_MAX; /* default error */
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}
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}
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}
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return (size_t)size;
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#endif /* _NTSUBSET_ */
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}
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#endif /* _POSIX_ */
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