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Diffstat (limited to 'private/crt32/string/wcsxfrm.c')
| -rw-r--r-- | private/crt32/string/wcsxfrm.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/private/crt32/string/wcsxfrm.c b/private/crt32/string/wcsxfrm.c new file mode 100644 index 000000000..b812450ca --- /dev/null +++ b/private/crt32/string/wcsxfrm.c @@ -0,0 +1,126 @@ +/*** +*wcsxfrm.c - Transform a wide-character string using locale information +* +* Copyright (c) 1988-1993, Microsoft Corporation. All rights reserved. +* +*Purpose: +* Transform a wide-character string using the locale information as set by +* LC_COLLATE. +* +*Revision History: +* 09-09-91 ETC Created from strxfrm.c. +* 12-09-91 ETC Updated api; Added multithread lock. +* 12-18-91 ETC Changed back LCMAP_SORTKEYA --> LCMAP_SORTKEY. +* 04-06-92 KRS Fix so it works without _INTL too. +* 08-19-92 KRS Activate use of NLS API. +* 09-02-92 SRW Get _INTL definition via ..\crt32.def +* 12-15-92 KRS Fix return value to match ANSI/ISO Std. +* 09-23-93 CFW Complete re-write. Non-C locale totally broken. +* +*******************************************************************************/ + +#include <cruntime.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <locale.h> +#include <setlocal.h> +#include <os2dll.h> + +/*** +*size_t wcsxfrm() - Transform a string using locale information +* +*Purpose: +* Transform the wide string pointed to by _string2 and place the +* resulting wide string into the array pointed to by _string1. +* No more than _count wide characters are placed into the +* resulting string (including the null). +* +* The transformation is such that if wcscmp() is applied to +* the two transformed strings, the return value is equal to +* the result of wcscoll() applied to the two original strings. +* Thus, the conversion must take the locale LC_COLLATE info +* into account. +* +* In the C locale, wcsxfrm() simply resolves to wcsncpy()/wcslen(). +* +*Entry: +* wchar_t *_string1 = result string +* const wchar_t *_string2 = source string +* size_t _count = max wide chars to move +* +* [If _count is 0, _string1 is permitted to be NULL.] +* +*Exit: +* Length of the transformed string (not including the terminating +* null). If the value returned is >= _count, the contents of the +* _string1 array are indeterminate. +* +*Exceptions: +* Non-standard: if OM/API error, return INT_MAX. +* +*******************************************************************************/ + +size_t _CRTAPI1 wcsxfrm ( + wchar_t *_string1, + const wchar_t *_string2, + size_t _count + ) +{ +#ifndef _INTL + if (_string1) + wcsncpy(_string1, _string2, _count); + return wcslen(_string2); +#else + int size; + unsigned char *bbuffer; + + + _mlock (_LC_COLLATE_LOCK); + + if (_lc_handle[LC_COLLATE] == _CLOCALEHANDLE) { + _munlock (_LC_COLLATE_LOCK); + wcsncpy(_string1, _string2, _count); + return wcslen(_string2); + } + + /* + * When using LCMAP_SORTKEY, LCMapStringW handles BYTES not wide + * chars. We use a byte buffer to hold bytes and then convert the + * byte string to a wide char string and return this so it can be + * compared using wcscmp(). User's buffer is _count wide chars, so + * use an internal buffer of _count bytes. + */ + + if (NULL == (bbuffer = (unsigned char *)malloc(_count))) + { + size = INT_MAX; + goto error_cleanup; + } + + if (0 == (size = LCMapStringW(_lc_handle[LC_COLLATE], LCMAP_SORTKEY, + _string2, -1, (wchar_t *)bbuffer, _count))) + { + /* buffer not big enough, get size required. */ + + if (0 == (size = LCMapStringW(_lc_handle[LC_COLLATE], LCMAP_SORTKEY, + _string2, -1, NULL, 0))) + size = INT_MAX; /* default error */ + else + size--; /* don't count NULL */ + + } else { + int i; + /* string successfully mapped, convert to wide char */ + + for (i = 0; i < size; i++) + _string1[i] = (wchar_t)bbuffer[i]; + + size--; /* don't count NULL */ + } + +error_cleanup: + _munlock (_LC_COLLATE_LOCK); + return (size_t)size; +#endif /* _INTL */ +} |