134 lines
4.3 KiB
C
134 lines
4.3 KiB
C
/***
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*xstrxfrm.c - Transform a string using locale information
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*
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* Copyright (c) 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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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#include <xlocinfo.h> /* for _Collvec */
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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 <mtdll.h>
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#include <setlocal.h>
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#include <awint.h>
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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_PURE size_t __CLRCALL_PURE_OR_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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size_t retval = (size_t)-1; /* NON-ANSI: default if OM or API error */
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UINT codepage;
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const wchar_t *locale_name;
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if (ploc == 0)
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{
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locale_name = ___lc_locale_name_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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locale_name = ploc->_LocaleName;
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codepage = ploc->_Page;
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}
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if ((locale_name == NULL) &&
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(codepage == _CLOCALECP))
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{
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if (_n2 <= _n1)
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{
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memcpy(_string1, _string2, _n2);
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}
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retval=_n2;
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}
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else
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{
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/* Inquire size of dst string in BYTES */
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if (0 != (dstlen = __crtLCMapStringA(NULL,
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locale_name,
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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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{
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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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{
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/* Map src string to dst string */
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__crtLCMapStringA(NULL,
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locale_name,
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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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}
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}
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}
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return (size_t)retval;
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}
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