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/***
*towlower.c - convert wide character to lower case
*
* Copyright (c) 1985-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines towlower().
*
*Revision History:
* 10-11-91 ETC Created.
* 12-10-91 ETC Updated nlsapi; added multithread.
* 04-06-92 KRS Make work without _INTL also.
* 01-19-93 CFW Changed LCMapString to LCMapStringW.
* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
* 06-11-93 CFW Fix error handling bug.
*
*******************************************************************************/
#include <cruntime.h>
#include <ctype.h>
#include <stdio.h>
#include <locale.h>
#ifdef _INTL
#include <setlocal.h>
#include <os2dll.h>
#endif
/***
*wchar_t towlower(c) - convert wide character to lower case
*
*Purpose:
* towlower() returns the lowercase equivalent of its argument
*
*Entry:
* c - wchar_t value of character to be converted
*
*Exit:
* if c is an upper case letter, returns wchar_t value of lower case
* representation of c. otherwise, it returns c.
*
*Exceptions:
*
*******************************************************************************/
wchar_t _CALLTYPE1 towlower (
wchar_t c
)
{
#if defined(_INTL) && !defined(_NTSUBSET_)
wchar_t widechar;
if (c == WEOF)
return c;
_mlock (_LC_CTYPE_LOCK);
if (_lc_handle[LC_CTYPE] == _CLOCALEHANDLE) {
if (iswupper(c))
c = c - L'A' + L'a';
_munlock (_LC_CTYPE_LOCK);
return c;
}
/* if checking case of c does not require API call, do it */
if (c < 256) {
if (!iswupper(c)) {
_munlock (_LC_CTYPE_LOCK);
return c;
}
}
/* convert wide char to lowercase */
if (LCMapStringW(_lc_handle[LC_CTYPE], LCMAP_LOWERCASE,
(LPCWSTR)&c, 1, (LPWSTR)&widechar, 1) == 0) {
_munlock (_LC_CTYPE_LOCK);
return c;
}
_munlock (_LC_CTYPE_LOCK);
return widechar;
#else
return (iswupper(c) ? (c + (wchar_t)(L'a' - L'A')) : c);
#endif /* _INTL */
}
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