a_loc.c

C标准库源代码

/***
*a_loc.c - A versions of GetLocaleInfo.
*
*       Copyright (c) 1993-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       Use either GetLocaleInfoA or GetLocaleInfoW depending on which is
*       available
*
*******************************************************************************/

#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <setlocal.h>
#include <awint.h>
#include <dbgint.h>

#define USE_W   1
#define USE_A   2

/***
*int __cdecl __crtGetLocaleInfoA - Get locale info and return it as an ASCII
*       string
*
*Purpose:
*       Internal support function. Assumes info in ANSI string format. Tries
*       to use NLS API call GetLocaleInfoA if available (Chicago) and uses
*       GetLocaleInfoA if it must (NT). If neither are available it fails and
*       returns 0.
*
*Entry:
*       LCID     Locale      - locale context for the comparison.
*       LCTYPE   LCType      - see NT\Chicago docs
*       LPSTR    lpLCData    - pointer to memory to return data
*       int      cchData     - char (byte) count of buffer (including NULL)
*                              (if 0, lpLCData is not referenced, size needed
*                              is returned)
*       int      code_page   - for MB/WC conversion. If 0, use __lc_codepage
*
*Exit:
*       Success: the number of characters copied (including NULL).
*       Failure: 0
*
*Exceptions:
*
*******************************************************************************/

int __cdecl __crtGetLocaleInfoA(
        LCID    Locale,
        LCTYPE  LCType,
        LPSTR   lpLCData,
        int     cchData,
        int     code_page
        )
{
        static int f_use = 0;

        /*
         * Look for unstubbed 'preferred' flavor. Otherwise use available flavor.
         * Must actually call the function to ensure it's not a stub.
         */

        if (0 == f_use)
        {
            if (0 != GetLocaleInfoW(0, LOCALE_ILANGUAGE, NULL, 0))
                f_use = USE_W;

            else if (0 != GetLocaleInfoA(0, LOCALE_ILANGUAGE, NULL, 0))
                f_use = USE_A;

            else
                return 0;
        }

        /* Use "A" version */

        if (USE_A == f_use)
        {
            return GetLocaleInfoA(Locale, LCType, lpLCData, cchData);
        }

        /* Use "W" version */

        if (USE_W == f_use)
        {
            int retval;
            int buff_size;
            wchar_t *wbuffer;

            /*
             * Use __lc_codepage for conversion if code_page not specified
             */

            if (0 == code_page)
                code_page = __lc_codepage;

            /* find out how big buffer needs to be */
            if (0 == (buff_size = GetLocaleInfoW(Locale, LCType, NULL, 0)))
                return 0;

            /* allocate buffer */
            __try {
                wbuffer = (wchar_t *)_alloca( buff_size * sizeof(wchar_t) );
            }
            __except( EXCEPTION_EXECUTE_HANDLER ) {
                wbuffer = NULL;
            }

            if ( wbuffer == NULL )
                return 0;

            /* get the info in wide format */
            if (0 == GetLocaleInfoW(Locale, LCType, wbuffer, buff_size))
                return 0;

            /* convert from Wide Char to ANSI */
            if (0 == cchData)
            {
                /* convert into local buffer */
                retval = WideCharToMultiByte( code_page,
                                              WC_COMPOSITECHECK | WC_SEPCHARS,
                                              wbuffer,
                                              -1,
                                              NULL,
                                              0,
                                              NULL,
                                              NULL );
            }
            else {
                /* convert into user buffer */
                retval = WideCharToMultiByte( code_page,
                                              WC_COMPOSITECHECK | WC_SEPCHARS,
                                              wbuffer,
                                              -1,
                                              lpLCData,
                                              cchData,
                                              NULL,
                                              NULL );
            }

            return retval;
        }
        else   /* f_use is neither USE_A nor USE_W */
            return 0;
}