/***
*aw_cmp.c - A & W versions of CompareString.
*
* Copyright (c) 1993-1995, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Use either CompareStringA or CompareStringW depending on which is available
*
*Revision History:
* 09-14-93 CFW Module created.
* 09-17-93 CFW Use unsigned chars.
* 09-23-93 CFW Correct NLS API params and comments about same.
* 10-07-93 CFW Optimize WideCharToMultiByte, use NULL default char.
* 10-22-93 CFW Test for invalid MB chars using global preset flag.
* 11-09-93 CFW Allow user to pass in code page.
* 11-18-93 CFW Test for entry point function stubs.
* 02-23-94 CFW Use W flavor whenever possible.
* 03-31-94 CFW Include awint.h.
* 05-09-94 CFW Do not let CompareString compare past NULL.
* 06-03-94 CFW Test for empty string early.
* 11/01-94 CFW But not too early for MB strings.
* 12-21-94 CFW Remove invalid MB chars NT 3.1 hack.
* 12-27-94 CFW Call direct, all OS's have stubs.
* 01-10-95 CFW Debug CRT allocs.
* 02-06-95 CFW assert -> _ASSERTE.
*
*******************************************************************************/
#include <cruntime.h>
#include <internal.h>
#include <dbgint.h>
#include <stdlib.h>
#include <setlocal.h>
#include <awint.h>
#include <dbgint.h>
#define USE_W 1
#define USE_A 2
/***
*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++;
if (!*cp)
return cp - string;
return cnt;
}
/***
*int __cdecl wcsncnt - count wide 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 wchar_t *string - start of string
* int n - byte count
*
*Exit:
* returns number of wide characaters from start of string to
* NULL (exclusive), up to n.
*
*Exceptions:
*
*******************************************************************************/
static int __cdecl wcsncnt (
const wchar_t *string,
int cnt
)
{
int n = cnt;
wchar_t *cp = (wchar_t *)string;
while (n-- && *cp)
cp++;
if (!*cp)
return cp - string;
return cnt;
}
/***
*int __cdecl __crtCompareStringW - Get type information about a wide string.
*
*Purpose:
* Internal support function. Assumes info in wide string format. Tries
* to use NLS API call CompareStringW if available and uses CompareStringA
* if it must. If neither are available it fails and returns 0.
*
*Entry:
* LCID Locale - locale context for the comparison.
* DWORD dwCmpFlags - see NT\Chicago docs
* LPCWSTR lpStringn - wide string to be compared
* int cchCountn - wide char (word) 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:
*
*******************************************************************************/
int __cdecl __crtCompareStringW(
LCID Locale,
DWORD dwCmpFlags,
LPCWSTR lpString1,
int cchCount1,
LPCWSTR lpString2,
int cchCount2,
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 != CompareStringW(0, 0, L"\0", 1, L"\0", 1))
f_use = USE_W;
else if (0 != CompareStringA(0, 0, "\0", 1, "\0", 1))
f_use = USE_A;
else
return 0;
}
/*
* CompareString will compare past NULL. Must find NULL if in string
* before cchCountn wide characters.
*/
if (cchCount1 > 0)
cchCount1= wcsncnt(lpString1, cchCount1);
if (cchCount2 > 0)
cchCount2= wcsncnt(lpString2, cchCount2);
if (!cchCount1 || !cchCount2)
return (cchCount1-cchCount2==0) ? 2 : (cchCount1-cchCount2<0) ? 1 : 3;
/* Use "W" version */
if (USE_W == f_use)
{
return CompareStringW(Locale, dwCmpFlags, lpString1, cchCount1, lpString2, cchCount2);
}
/* Use "A" version */
if (USE_A == f_use)
{
int retval = 0;
int buff_size1;
int buff_size2;
unsigned char *buffer1 = NULL;
unsigned char *buffer2 = NULL;
/*
* Use __lc_codepage for conversion if code_page not specified
*/
if (0 == code_page)
code_page = __lc_codepage;
/*
* Convert strings and return the requested information.
*/
/* find out how big a buffer we need (includes NULL if any) */
if (0 == (buff_size1 = WideCharToMultiByte(code_page,
WC_COMPOSITECHECK | WC_SEPCHARS, lpString1, cchCount1,
NULL, 0, NULL, NULL)))
return 0;
/* allocate enough space for chars */
if (NULL == (buffer1 = (unsigned char *)
_malloc_crt(buff_size1 * sizeof(char))))
return 0;
/* do the conversion */
if (0 == WideCharToMultiByte(code_page,
WC_COMPOSITECHECK | WC_SEPCHARS, lpString1, cchCount1,
buffer1, buff_size1, NULL, NULL))
goto error_cleanup;
/* find out how big a buffer we need (includes NULL if any) */
if (0 == (buff_size2 = WideCharToMultiByte(code_page,
WC_COMPOSITECHECK | WC_SEPCHARS, lpString2, cchCount2,
NULL, 0, NULL, NULL)))
goto error_cleanup;
/* allocate enough space for chars */
if (NULL == (buffer2 = (unsigned char *)
_malloc_crt(buff_size2 * sizeof(char))))
goto error_cleanup;
/* do the conversion */
if (0 == WideCharToMultiByte(code_page,
WC_COMPOSITECHECK | WC_SEPCHARS, lpString2, cchCount2,
buffer2, buff_size2, NULL, NULL))
goto error_cleanup;
retval = CompareStringA(Locale, dwCmpFlags, buffer1, buff_size1, buffer2, buff_size2);
_free_crt(buffer1);
_free_crt(buffer2);
return retval;
error_cleanup:
_free_crt(buffer1);
_free_crt(buffer2);
return 0;
}
}
/***
*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:
* LCID Locale - 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:
*
*******************************************************************************/
int __cdecl __crtCompareStringA(
LCID Locale,
DWORD dwCmpFlags,
LPCSTR lpString1,
int cchCount1,
LPCSTR lpString2,
int cchCount2,
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 != CompareStringA(0, 0, "\0", 1, "\0", 1))
f_use = USE_A;
else if (0 != CompareStringW(0, 0, L"\0", 1, L"\0", 1))
f_use = USE_W;
else
return 0;
}
/*
* CompareString will compare past NULL. Must find NULL if in string
* before cchCountn chars.
*/
if (cchCount1 > 0)
cchCount1 = strncnt(lpString1, cchCount1);
if (cchCount2 > 0)
cchCount2 = strncnt(lpString2, cchCount2);
/* Use "A" version */
if (USE_A == f_use)
{
return CompareStringA(Locale, dwCmpFlags, lpString1, cchCount1, lpString2, cchCount2);
}
/* Use "W" version */
if (USE_W == f_use)
{
int retval = 0;
int buff_size1 = 0;
int buff_size2 = 0;
wchar_t *wbuffer1 = NULL;
wchar_t *wbuffer2 = NULL;
/*
* Use __lc_codepage for conversion if code_page not specified
*/
if (0 == code_page)
code_page = __lc_codepage;
/*
* Special case: at least one count is zero
*/
if (!cchCount1 || !cchCount2)
{
unsigned char *cp; // char pointer
CPINFO lpCPInfo; // 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, &lpCPInfo) == FALSE)
return 0;
_ASSERTE(cchCount1==0 && cchCount2==1 || cchCount1==1 && cchCount2==0);
/* string 1 has count of 1 */
if (cchCount1 > 0)
{
if (lpCPInfo.MaxCharSize < 2)
return 3;
for (cp = (unsigned char *)lpCPInfo.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 (lpCPInfo.MaxCharSize < 2)
return 1;
for (cp = (unsigned char *)lpCPInfo.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 */
if (NULL == (wbuffer1 = (wchar_t *)
_malloc_crt(buff_size1 * sizeof(wchar_t))))
return 0;
/* do the conversion */
if (0 == MultiByteToWideChar(code_page,
MB_PRECOMPOSED, lpString1, cchCount1, wbuffer1, buff_size1))
goto done;
/* 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 done;
/* allocate enough space for chars */
if (NULL == (wbuffer2 = (wchar_t *)
_malloc_crt(buff_size2 * sizeof(wchar_t))))
goto done;
/* do the conversion */
if (0 == MultiByteToWideChar(code_page,
MB_PRECOMPOSED, lpString2, cchCount2, wbuffer2, buff_size2))
goto done;
retval = CompareStringW(Locale, dwCmpFlags, wbuffer1, buff_size1, wbuffer2, buff_size2);
done:
_free_crt(wbuffer1);
_free_crt(wbuffer2);
return retval;
}
}