184 lines
6.2 KiB
C
184 lines
6.2 KiB
C
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/***
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*strxfrm.c - Transform a 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 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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* 03-21-89 JCR Module created.
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* 06-20-89 JCR Removed _LOAD_DGROUP code
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 10-02-90 GJF New-style function declarator.
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* 10-02-91 ETC Non-C locale support under _INTL switch.
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* 12-09-91 ETC Updated api; added multithread.
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* 12-18-91 ETC Don't convert output of LCMapString.
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* 08-18-92 KRS Activate NLS API. Fix behavior.
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* 09-02-92 SRW Get _INTL definition via ..\crt32.def
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* 12-11-92 SKS Need to handle count=0 in non-INTL code
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* 12-15-92 KRS Handle return value according to ANSI.
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* 01-18-93 CFW Removed unreferenced variable "dummy".
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* 03-10-93 CFW Remove UNDONE comment.
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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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* 11-09-93 CFW Use LC_COLLATE code page for __crtxxx() conversion.
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* 09-06-94 CFW Remove _INTL switch.
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* 10-24-94 GJF Sped up C locale, multi-thread case.
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* 12-29-94 CFW Merge non-Win32.
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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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* 03-17-97 RDK Added error flag to __crtLCMapStringA.
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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.
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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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* 05-17-99 PML Remove all Macintosh support.
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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 <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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/***
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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 _count 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 = result string
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* const char *_string2 = source string
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* size_t _count = max 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 strxfrm (
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char *_string1,
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const char *_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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strncpy(_string1, _string2, _count);
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return strlen(_string2);
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#else
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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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#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)retval;
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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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(ptloci->lc_collate_cp == _CLOCALECP) )
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#else
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if ( (__lc_handle[LC_COLLATE] == _CLOCALEHANDLE) &&
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(__lc_collate_cp == _CLOCALECP) )
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#endif
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{
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strncpy(_string1, _string2, _count);
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return strlen(_string2);
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}
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/* Inquire size of dst string in BYTES */
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#ifdef _MT
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if ( 0 == (dstlen = __crtLCMapStringA( ptloci->lc_handle[LC_COLLATE],
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#else
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if ( 0 == (dstlen = __crtLCMapStringA( __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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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)_count )
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goto error_cleanup;
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/* Map src string to dst string */
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#ifdef _MT
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if ( 0 == __crtLCMapStringA( ptloci->lc_handle[LC_COLLATE],
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#else
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if ( 0 == __crtLCMapStringA( __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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_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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TRUE ) )
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retval = INT_MAX;
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error_cleanup:
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return (size_t)retval;
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#endif /* _NTSUBSET_ */
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}
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