162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/***
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*xstrxfrm.c - Transform a string using locale information
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*
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* Copyright (c) 1996-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Transform a 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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* 01-XX-96 PJP Created from strxfrm.c January 1996 by P.J. Plauger
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* 04-18-96 GJF Updated for current locale locking. Also, reformatted
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* and made several cosmetic changes.
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* 03-17-97 RDK Added error flag to __crtLCMapStringA.
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* 12-02-97 GJF Removed bogus codepage determination.
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* 01-12-98 GJF Use _lc_collate_cp codepage.
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* 01-05-99 GJF Changes for 64-bit size_t.
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* 05-17-99 PML Remove all Macintosh support.
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* 01-29-01 GB Added _func function version of data variable used in msvcprt.lib
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* to work with STATIC_CPPLIB
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#include <xlocinfo.h> /* for _Collvec, _Strxfrm */
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#include <windows.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <malloc.h>
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#include <locale.h>
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#include <setlocal.h>
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#include <awint.h>
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#include <mtdll.h>
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/* Define _CRTIMP2 */
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#ifndef _CRTIMP2
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#ifdef CRTDLL2
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#define _CRTIMP2 __declspec(dllexport)
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#else /* ndef CRTDLL2 */
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#ifdef _DLL
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#define _CRTIMP2 __declspec(dllimport)
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#else /* ndef _DLL */
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#define _CRTIMP2
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#endif /* _DLL */
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#endif /* CRTDLL2 */
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#endif /* _CRTIMP2 */
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/***
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*size_t _Strxfrm() - Transform a string using locale information
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*
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*Purpose:
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* Transform the string pointer to by _string2 and place the
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* resulting string into the array pointer to by _string1.
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* No more than _end1 - _string1 characters are place 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 strcmp() is applied to
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* the two transformed strings, the return value is equal to
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* the result of strcoll() 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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* [ANSI]
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*
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* The value of the following expression is the size of the array
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* needed to hold the transformation of the source string:
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*
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* 1 + strxfrm(NULL,string,0)
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*
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* NOTE: Currently, the C libraries support the "C" locale only.
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* Thus, _Strxfrm() simply resolves to strncpy()/strlen().
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*
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*Entry:
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* char *_string1 = pointer to beginning of result string
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* char *_end1 = pointer past end of result string
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* const char *_string2 = pointer to beginning of source string
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* const char *_end2 = pointer past end of source string
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* const _Collvec *ploc = pointer to locale info
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*
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*Exit:
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* Length of the transformed string.
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* If the value returned is too big, 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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_CRTIMP2 size_t __cdecl _Strxfrm (
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char *_string1,
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char *_end1,
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const char *_string2,
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const char *_end2,
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const _Collvec *ploc
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)
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{
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size_t _n1 = _end1 - _string1;
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size_t _n2 = _end2 - _string2;
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int dstlen;
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int retval = INT_MAX; /* NON-ANSI: default if OM or API error */
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LCID handle;
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UINT codepage;
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#ifdef _MT
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int local_lock_flag;
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_lock_locale( local_lock_flag )
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#endif
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if (ploc == 0)
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{
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handle = ___lc_handle_func()[LC_COLLATE];
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codepage = ___lc_collate_cp_func();
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}
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else
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{
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handle = ploc->_Hand;
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codepage = ploc->_Page;
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}
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if ((handle == _CLOCALEHANDLE) &&
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(codepage == _CLOCALECP))
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{
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_unlock_locale( local_lock_flag )
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if (_n2 <= _n1)
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memcpy(_string1, _string2, _n2);
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return _n2;
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}
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/* Inquire size of dst string in BYTES */
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if (0 == (dstlen = __crtLCMapStringA(handle,
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LCMAP_SORTKEY,
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_string2,
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(int)_n2,
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NULL,
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0,
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codepage,
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TRUE)))
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goto error_cleanup;
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retval = dstlen;
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/* if not enough room, return amount needed */
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if (dstlen > (int)(_n1))
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goto error_cleanup;
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/* Map src string to dst string */
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if (0 == __crtLCMapStringA(handle,
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LCMAP_SORTKEY,
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_string2,
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(int)_n2,
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_string1,
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(int)_n1,
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codepage,
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TRUE))
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goto error_cleanup;
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error_cleanup:
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_unlock_locale( local_lock_flag )
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return (size_t)retval;
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}
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