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385 lines
14 KiB
385 lines
14 KiB
/***
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*a_cmp.c - A version of CompareString.
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*
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* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Use either CompareStringA or CompareStringW depending on which is
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* available
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*
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*Revision History:
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* 09-14-93 CFW Module created.
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* 09-17-93 CFW Use unsigned chars.
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* 09-23-93 CFW Correct NLS API params and comments about same.
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* 10-07-93 CFW Optimize WideCharToMultiByte, use NULL default char.
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* 10-22-93 CFW Test for invalid MB chars using global preset flag.
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* 11-09-93 CFW Allow user to pass in code page.
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* 11-18-93 CFW Test for entry point function stubs.
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* 02-23-94 CFW Use W flavor whenever possible.
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* 03-31-94 CFW Include awint.h.
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* 05-09-94 CFW Do not let CompareString compare past NULL.
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* 06-03-94 CFW Test for empty string early.
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* 11/01-94 CFW But not too early for MB strings.
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* 12-21-94 CFW Remove invalid MB chars NT 3.1 hack.
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* 12-27-94 CFW Call direct, all OS's have stubs.
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* 01-10-95 CFW Debug CRT allocs.
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* 02-06-95 CFW assert -> _ASSERTE.
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* 02-15-97 RDK For narrow comparsion, try W version first so Windows NT
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* can process nonANSI codepage correctly.
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* 05-15-97 GJF Moved W version into another file, renamed this as
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* a_cmp.c. Replaced use of _malloc_crt/_free_crt with
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* _alloca. Also, detab-ed and cleaned up the code a bit.
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* 05-27-98 GJF Changed strncnt() so that it will never examine the
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* (cnt + 1)-th byte of the string.
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* 08-18-98 GJF Use _malloc_crt if _alloca fails.
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* 12-10-99 GB Added support for recovery from stack overflow around
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* _alloca().
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* 05-17-00 GB Use ERROR_CALL_NOT_IMPLEMENTED for existance of W API
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* 08-23-00 GB Fixed bug with non Ansi CP on Win9x.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <internal.h>
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#include <dbgint.h>
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#include <stdlib.h>
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#include <setlocal.h>
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#include <locale.h>
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#include <awint.h>
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#include <dbgint.h>
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#include <malloc.h>
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#include <awint.h>
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#define USE_W 1
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#define USE_A 2
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/***
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*int __cdecl strncnt - count characters in a string, up to n.
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*
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*Purpose:
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* Internal local support function. Counts characters in string before NULL.
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* If NULL not found in n chars, then return n.
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*
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*Entry:
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* const char *string - start of string
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* int n - byte count
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*
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*Exit:
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* returns number of bytes from start of string to
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* NULL (exclusive), up to n.
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*
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*Exceptions:
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*
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*******************************************************************************/
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static int __cdecl strncnt (
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const char *string,
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int cnt
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)
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{
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int n = cnt;
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char *cp = (char *)string;
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while (n-- && *cp)
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cp++;
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return cnt - n - 1;
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}
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/***
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*int __cdecl __crtCompareStringA - Get type information about an ANSI string.
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*
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*Purpose:
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* Internal support function. Assumes info in ANSI string format. Tries
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* to use NLS API call CompareStringA if available and uses CompareStringW
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* if it must. If neither are available it fails and returns 0.
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*
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*Entry:
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* LCID Locale - locale context for the comparison.
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* DWORD dwCmpFlags - see NT\Chicago docs
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* LPCSTR lpStringn - multibyte string to be compared
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* int cchCountn - char (byte) count (NOT including NULL)
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* (-1 if NULL terminated)
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* int code_page - for MB/WC conversion. If 0, use __lc_codepage
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*
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*Exit:
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* Success: 1 - if lpString1 < lpString2
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* 2 - if lpString1 == lpString2
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* 3 - if lpString1 > lpString2
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* Failure: 0
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl __crtCompareStringA(
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LCID Locale,
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DWORD dwCmpFlags,
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LPCSTR lpString1,
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int cchCount1,
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LPCSTR lpString2,
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int cchCount2,
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int code_page
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)
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{
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static int f_use = 0;
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/*
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* Look for unstubbed 'preferred' flavor. Otherwise use available flavor.
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* Must actually call the function to ensure it's not a stub.
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* (Always try wide version first so WinNT can process codepage correctly.)
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*/
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if (0 == f_use)
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{
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if (0 != CompareStringW(0, 0, L"\0", 1, L"\0", 1))
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f_use = USE_W;
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else if (GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
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f_use = USE_A;
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}
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/*
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* CompareString will compare past NULL. Must find NULL if in string
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* before cchCountn chars.
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*/
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if (cchCount1 > 0)
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cchCount1 = strncnt(lpString1, cchCount1);
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if (cchCount2 > 0)
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cchCount2 = strncnt(lpString2, cchCount2);
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/* Use "A" version */
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if (USE_A == f_use || f_use == 0)
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{
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char *cbuffer1 = NULL;
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char *cbuffer2 = NULL;
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int ret;
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int AnsiCP;
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if (0 == Locale)
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Locale = __lc_handle[LC_CTYPE];
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if (0 == code_page)
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code_page = __lc_codepage;
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if ( -1 == (AnsiCP = __ansicp(Locale)))
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return FALSE;
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/* If current CP is not ANSI CP for the given Locale, convert the
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* string from current CP to ansi CP as CompareStringA uses
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* ANSI CP to compare strings.
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*/
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if ( AnsiCP != code_page)
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{
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cbuffer1 = __convertcp(code_page,
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AnsiCP,
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lpString1,
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&cchCount1,
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NULL,
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0);
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if (cbuffer1 == NULL)
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return FALSE;
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cbuffer2 = __convertcp(code_page,
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AnsiCP,
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lpString2,
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&cchCount2,
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NULL,
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0);
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if (cbuffer2 == NULL)
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{
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_free_crt(cbuffer1);
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return FALSE;
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}
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lpString1 = cbuffer1;
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lpString2 = cbuffer2;
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}
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ret = CompareStringA( Locale,
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dwCmpFlags,
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lpString1,
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cchCount1,
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lpString2,
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cchCount2 );
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if ( cbuffer1 != NULL)
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{
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_free_crt(cbuffer1);
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_free_crt(cbuffer2);
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}
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return ret;
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}
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/* Use "W" version */
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if (USE_W == f_use)
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{
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int buff_size1;
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int buff_size2;
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wchar_t *wbuffer1;
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wchar_t *wbuffer2;
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int malloc_flag1 = 0;
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int malloc_flag2 = 0;
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int retcode = 0;
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/*
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* Use __lc_codepage for conversion if code_page not specified
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*/
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if (0 == code_page)
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code_page = __lc_codepage;
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/*
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* Special case: at least one count is zero
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*/
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if (!cchCount1 || !cchCount2)
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{
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unsigned char *cp; // char pointer
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CPINFO lpCPInfo; // struct for use with GetCPInfo
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/* both strings zero */
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if (cchCount1 == cchCount2)
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return 2;
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/* string 1 greater */
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if (cchCount2 > 1)
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return 1;
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/* string 2 greater */
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if (cchCount1 > 1)
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return 3;
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/*
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* one has zero count, the other has a count of one
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* - if the one count is a naked lead byte, the strings are equal
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* - otherwise it is a single character and they are unequal
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*/
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if (GetCPInfo(code_page, &lpCPInfo) == FALSE)
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return 0;
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_ASSERTE(cchCount1==0 && cchCount2==1 || cchCount1==1 && cchCount2==0);
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/* string 1 has count of 1 */
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if (cchCount1 > 0)
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{
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if (lpCPInfo.MaxCharSize < 2)
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return 3;
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for ( cp = (unsigned char *)lpCPInfo.LeadByte ;
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cp[0] && cp[1] ;
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cp += 2 )
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if ( (*(unsigned char *)lpString1 >= cp[0]) &&
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(*(unsigned char *)lpString1 <= cp[1]) )
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return 2;
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return 3;
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}
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/* string 2 has count of 1 */
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if (cchCount2 > 0)
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{
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if (lpCPInfo.MaxCharSize < 2)
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return 1;
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for ( cp = (unsigned char *)lpCPInfo.LeadByte ;
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cp[0] && cp[1] ;
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cp += 2 )
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if ( (*(unsigned char *)lpString2 >= cp[0]) &&
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(*(unsigned char *)lpString2 <= cp[1]) )
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return 2;
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return 1;
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}
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}
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/*
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* Convert strings and return the requested information.
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*/
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/* find out how big a buffer we need (includes NULL if any) */
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if ( 0 == (buff_size1 = MultiByteToWideChar( code_page,
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MB_PRECOMPOSED |
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MB_ERR_INVALID_CHARS,
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lpString1,
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cchCount1,
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NULL,
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0 )) )
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return 0;
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/* allocate enough space for chars */
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__try {
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wbuffer1 = (wchar_t *)_alloca( buff_size1 * sizeof(wchar_t) );
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}
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__except( EXCEPTION_EXECUTE_HANDLER ) {
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_resetstkoflw();
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wbuffer1 = NULL;
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}
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if ( wbuffer1 == NULL ) {
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if ( (wbuffer1 = (wchar_t *)_malloc_crt(buff_size1 * sizeof(wchar_t)))
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== NULL )
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return 0;
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malloc_flag1++;
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}
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/* do the conversion */
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if ( 0 == MultiByteToWideChar( code_page,
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MB_PRECOMPOSED,
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lpString1,
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cchCount1,
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wbuffer1,
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buff_size1 ) )
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goto error_cleanup;
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/* find out how big a buffer we need (includes NULL if any) */
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if ( 0 == (buff_size2 = MultiByteToWideChar( code_page,
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MB_PRECOMPOSED |
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MB_ERR_INVALID_CHARS,
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lpString2,
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cchCount2,
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NULL,
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0 )) )
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goto error_cleanup;
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/* allocate enough space for chars */
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__try {
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wbuffer2 = (wchar_t *)_alloca( buff_size2 * sizeof(wchar_t) );
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}
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__except( EXCEPTION_EXECUTE_HANDLER ) {
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_resetstkoflw();
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wbuffer2 = NULL;
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}
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if ( wbuffer2 == NULL ) {
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if ( (wbuffer2 = (wchar_t *)_malloc_crt(buff_size2 * sizeof(wchar_t)))
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== NULL )
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goto error_cleanup;
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malloc_flag2++;
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}
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/* do the conversion */
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if ( 0 != MultiByteToWideChar( code_page,
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MB_PRECOMPOSED,
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lpString2,
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cchCount2,
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wbuffer2,
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buff_size2 ) )
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retcode = CompareStringW( Locale,
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dwCmpFlags,
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wbuffer1,
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buff_size1,
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wbuffer2,
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buff_size2 );
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if ( malloc_flag2 )
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_free_crt(wbuffer2);
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error_cleanup:
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if ( malloc_flag1 )
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_free_crt(wbuffer1);
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return retcode;
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}
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else /* f_use is neither USE_A nor USE_W */
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return 0;
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}
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