mirror of https://github.com/lianthony/NT4.0
126 lines
3.7 KiB
126 lines
3.7 KiB
/***
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*wcsxfrm.c - Transform a wide-character string using locale information
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*
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* Copyright (c) 1988-1993, 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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* 09-23-93 CFW Complete re-write. Non-C locale totally broken.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdlib.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 <os2dll.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 _CRTAPI1 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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#ifndef _INTL
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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;
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unsigned char *bbuffer;
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_mlock (_LC_COLLATE_LOCK);
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if (_lc_handle[LC_COLLATE] == _CLOCALEHANDLE) {
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_munlock (_LC_COLLATE_LOCK);
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wcsncpy(_string1, _string2, _count);
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return wcslen(_string2);
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}
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/*
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* When using LCMAP_SORTKEY, LCMapStringW handles BYTES not wide
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* chars. We use a byte buffer to hold bytes and then convert the
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* byte string to a wide char string and return this so it can be
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* compared using wcscmp(). User's buffer is _count wide chars, so
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* use an internal buffer of _count bytes.
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*/
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if (NULL == (bbuffer = (unsigned char *)malloc(_count)))
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{
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size = INT_MAX;
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goto error_cleanup;
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}
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if (0 == (size = LCMapStringW(_lc_handle[LC_COLLATE], LCMAP_SORTKEY,
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_string2, -1, (wchar_t *)bbuffer, _count)))
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{
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/* buffer not big enough, get size required. */
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if (0 == (size = LCMapStringW(_lc_handle[LC_COLLATE], LCMAP_SORTKEY,
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_string2, -1, NULL, 0)))
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size = INT_MAX; /* default error */
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else
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size--; /* don't count NULL */
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} else {
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int i;
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/* string successfully mapped, convert to wide char */
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for (i = 0; i < size; i++)
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_string1[i] = (wchar_t)bbuffer[i];
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size--; /* don't count NULL */
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}
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error_cleanup:
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_munlock (_LC_COLLATE_LOCK);
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return (size_t)size;
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#endif /* _INTL */
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}
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