/***
*a_cmp.c - A version of CompareString.
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* Use either CompareStringA or CompareStringW depending on which is
* available
*
*******************************************************************************/
#include <cruntime.h>
#include <internal.h>
#include <dbgint.h>
#include <stdlib.h>
#include <locale.h>
#include <awint.h>
#include <dbgint.h>
#include <malloc.h>
#include <awint.h>
#include <mtdll.h>
#include <setlocal.h>
/***
*int __cdecl strncnt - count characters in a string, up to n.
*
*Purpose:
* Internal local support function. Counts characters in string before NULL.
* If NULL not found in n chars, then return n.
*
*Entry:
* const char *string - start of string
* int n - byte count
*
*Exit:
* returns number of bytes from start of string to
* NULL (exclusive), up to n.
*
*Exceptions:
*
*******************************************************************************/
static int __cdecl strncnt (
const char *string,
int cnt
)
{
int n = cnt;
char *cp = (char *)string;
while (n-- && *cp)
cp++;
return cnt - n - 1;
}
/***
*int __cdecl __crtCompareStringA - Get type information about an ANSI string.
*
*Purpose:
* Internal support function. Assumes info in ANSI string format. Tries
* to use NLS API call CompareStringA if available and uses CompareStringW
* if it must. If neither are available it fails and returns 0.
*
*Entry:
* LPCWSTR LocaleName - locale context for the comparison.
* DWORD dwCmpFlags - see NT\Chicago docs
* LPCSTR lpStringn - multibyte string to be compared
* int cchCountn - char (byte) count (NOT including NULL)
* (-1 if NULL terminated)
* int code_page - for MB/WC conversion. If 0, use __lc_codepage
*
*Exit:
* Success: 1 - if lpString1 < lpString2
* 2 - if lpString1 == lpString2
* 3 - if lpString1 > lpString2
* Failure: 0
*
*Exceptions:
*
*******************************************************************************/
static int __cdecl __crtCompareStringA_stat(
_locale_t plocinfo,
LPCWSTR LocaleName,
DWORD dwCmpFlags,
LPCSTR lpString1,
int cchCount1,
LPCSTR lpString2,
int cchCount2,
int code_page
)
{
/*
* CompareString will compare past NULL. Must find NULL if in string
* before cchCountn chars.
*/
if (cchCount1 > 0)
cchCount1 = strncnt(lpString1, cchCount1);
else if ( cchCount1 < -1 )
return FALSE;
if (cchCount2 > 0)
cchCount2 = strncnt(lpString2, cchCount2);
else if ( cchCount2 < -1 )
return FALSE;
int buff_size1;
int buff_size2;
wchar_t *wbuffer1;
wchar_t *wbuffer2;
int retcode = 0;
/*
* Use __lc_codepage for conversion if code_page not specified
*/
if (0 == code_page)
code_page = plocinfo->locinfo->lc_codepage;
/*
* Special case: at least one count is zero
*/
if (!cchCount1 || !cchCount2)
{
unsigned char *cp; // char pointer
CPINFO cpInfo; // struct for use with GetCPInfo
/* both strings zero */
if (cchCount1 == cchCount2)
return 2;
/* string 1 greater */
if (cchCount2 > 1)
return 1;
/* string 2 greater */
if (cchCount1 > 1)
return 3;
/*
* one has zero count, the other has a count of one
* - if the one count is a naked lead byte, the strings are equal
* - otherwise it is a single character and they are unequal
*/
if (GetCPInfo(code_page, &cpInfo) == FALSE)
return 0;
_ASSERTE(cchCount1==0 && cchCount2==1 || cchCount1==1 && cchCount2==0);
/* string 1 has count of 1 */
if (cchCount1 > 0)
{
if (cpInfo.MaxCharSize < 2)
return 3;
for ( cp = (unsigned char *)cpInfo.LeadByte ;
cp[0] && cp[1] ;
cp += 2 )
if ( (*(unsigned char *)lpString1 >= cp[0]) &&
(*(unsigned char *)lpString1 <= cp[1]) )
return 2;
return 3;
}
/* string 2 has count of 1 */
if (cchCount2 > 0)
{
if (cpInfo.MaxCharSize < 2)
return 1;
for ( cp = (unsigned char *)cpInfo.LeadByte ;
cp[0] && cp[1] ;
cp += 2 )
if ( (*(unsigned char *)lpString2 >= cp[0]) &&
(*(unsigned char *)lpString2 <= cp[1]) )
return 2;
return 1;
}
}
/*
* Convert strings and return the requested information.
*/
/* find out how big a buffer we need (includes NULL if any) */
if ( 0 == (buff_size1 = MultiByteToWideChar( code_page,
MB_PRECOMPOSED |
MB_ERR_INVALID_CHARS,
lpString1,
cchCount1,
NULL,
0 )) )
return 0;
/* allocate enough space for chars */
wbuffer1 = (wchar_t *)_calloca( buff_size1, sizeof(wchar_t) );
if ( wbuffer1 == NULL ) {
return 0;
}
/* do the conversion */
if ( 0 == MultiByteToWideChar( code_page,
MB_PRECOMPOSED,
lpString1,
cchCount1,
wbuffer1,
buff_size1 ) )
goto error_cleanup;
/* find out how big a buffer we need (includes NULL if any) */
if ( 0 == (buff_size2 = MultiByteToWideChar( code_page,
MB_PRECOMPOSED |
MB_ERR_INVALID_CHARS,
lpString2,
cchCount2,
NULL,
0 )) )
goto error_cleanup;
/* allocate enough space for chars */
wbuffer2 = (wchar_t *)_calloca( buff_size2, sizeof(wchar_t) );
if ( wbuffer2 == NULL ) {
goto error_cleanup;
}
/* do the conversion */
if ( 0 != MultiByteToWideChar( code_page,
MB_PRECOMPOSED,
lpString2,
cchCount2,
wbuffer2,
buff_size2 ) )
{
retcode = __crtCompareStringEx( LocaleName,
dwCmpFlags,
wbuffer1,
buff_size1,
wbuffer2,
buff_size2);
}
_freea(wbuffer2);
error_cleanup:
_freea(wbuffer1);
return retcode;
}
extern "C" int __cdecl __crtCompareStringA(
_locale_t plocinfo,
LPCWSTR LocaleName,
DWORD dwCmpFlags,
LPCSTR lpString1,
int cchCount1,
LPCSTR lpString2,
int cchCount2,
int code_page
)
{
_LocaleUpdate _loc_update(plocinfo);
return __crtCompareStringA_stat(
_loc_update.GetLocaleT(),
LocaleName,
dwCmpFlags,
lpString1,
cchCount1,
lpString2,
cchCount2,
code_page
);
}