/***
*w_map.c - W version of LCMapString.
*
* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Use either LCMapStringA or LCMapStringW 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.
* 07-26-94 CFW Bug fix #14730, LCMapString goes past NULLs.
* 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.
* 02-15-97 RDK For narrow mapping, try W version first so Windows NT
* can process nonANSI codepage correctly.
* 03-16-97 RDK Added error flag to __crtLCMapStringA.
* 05-09-97 GJF Split off from aw_map.c. Revised to use _alloca
* instead of malloc. Also, reformatted.
* 05-27-98 GJF Changed wcsncnt() so that it will never examine the
* (cnt + 1)-th byte of the string.
* 08-18-98 GJF Use _malloc_crt if _alloca fails.
* 04-28-99 GJF Changed dwFlags arg value to 0 in WideCharToMultiByte
* calls to avoid problems with codepage 1258 on NT 5.0.
* 12-10-99 GB Added support for recovery from stack overflow around
* _alloca().
* 05-17-00 GB Use ERROR_CALL_NOT_IMPLEMENTED for existance of W API
* 08-23-00 GB Fixed bug with non Ansi CP on Win9x.
*
*******************************************************************************/
#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <setlocal.h>
#include <locale.h>
#include <awint.h>
#include <dbgint.h>
#include <malloc.h>
#define USE_W 1
#define USE_A 2
/***
*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++;
return cnt - n - 1;
}
/***
*int __cdecl __crtLCMapStringW - Get type information about a wide string.
*
*Purpose:
* Internal support function. Assumes info in wide string format. Tries
* to use NLS API call LCMapStringW if available and uses LCMapStringA
* if it must. If neither are available it fails and returns 0.
*
*Entry:
* LCID Locale - locale context for the comparison.
* DWORD dwMapFlags - see NT\Chicago docs
* LPCWSTR lpSrcStr - pointer to string to be mapped
* int cchSrc - wide char (word) count of input string
* (including NULL if any)
* (-1 if NULL terminated)
* LPWSTR lpDestStr - pointer to memory to store mapping
* int cchDest - wide char (word) count of buffer (including NULL)
* int code_page - for MB/WC conversion. If 0, use __lc_codepage
*
* NOTE: if LCMAP_SORTKEY is specified, then cchDest refers to number
* of BYTES, not number of wide chars. The return string will be
* a series of bytes with a NULL byte terminator.
*
*Exit:
* Success: if LCMAP_SORKEY:
* number of bytes written to lpDestStr (including NULL byte
* terminator)
* else
* number of wide characters written to lpDestStr (including
* NULL)
* Failure: 0
*
*Exceptions:
*
*******************************************************************************/
int __cdecl __crtLCMapStringW(
LCID Locale,
DWORD dwMapFlags,
LPCWSTR lpSrcStr,
int cchSrc,
LPWSTR lpDestStr,
int cchDest,
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 != LCMapStringW(0, LCMAP_LOWERCASE, L"\0", 1, NULL, 0))
f_use = USE_W;
else if (GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
f_use = USE_A;
}
/*
* LCMapString will map past NULL. Must find NULL if in string
* before cchSrc wide characters.
*/
if (cchSrc > 0)
cchSrc = wcsncnt(lpSrcStr, cchSrc);
/* Use "W" version */
if (USE_W == f_use) {
return LCMapStringW( Locale, dwMapFlags, lpSrcStr, cchSrc,
lpDestStr, cchDest );
}
/* Use "A" version */
if (USE_A == f_use || f_use == 0) {
int retval = 0;
int inbuff_size;
int outbuff_size;
unsigned char *inbuffer;
unsigned char *outbuffer;
int malloc_flag1 = 0;
int malloc_flag2 = 0;
int AnsiCP = 0;
/*
* Convert string and return the requested information. Note that
* we are converting to a multibyte string so there is not a
* one-to-one correspondence between number of wide chars in the
* input string and the number of *bytes* in the buffer. However,
* there had *better be* a one-to-one correspondence between the
* number of wide characters and the number of multibyte characters
* (enforced by WC_SEPCHARS) in the buffer or the resulting mapped
* string will be worthless to the user.
*
*/
/*
* Use __lc_codepage for conversion if code_page not specified
*/
if (0 == Locale)
Locale = __lc_handle[LC_CTYPE];
if (0 == code_page)
code_page = __lc_codepage;
/*
* Always use Ansi codepage with Ansi WinAPI because they use
* Ansi codepage
*/
if ( code_page != (AnsiCP = __ansicp(Locale)))
{
if (AnsiCP != -1)
code_page = AnsiCP;
}
/* find out how big a buffer we need (includes NULL if any) */
if ( 0 == (inbuff_size = WideCharToMultiByte( code_page,
0,
lpSrcStr,
cchSrc,
NULL,
0,
NULL,
NULL )) )
return 0;
/* allocate enough space for chars */
__try {
inbuffer = (unsigned char *)_alloca( inbuff_size * sizeof(char) );
}
__except(EXCEPTION_EXECUTE_HANDLER) {
_resetstkoflw();
inbuffer = NULL;
}
if ( inbuffer == NULL ) {
if ( (inbuffer = (unsigned char *)_malloc_crt(inbuff_size * sizeof(char)))
== NULL )
return 0;
malloc_flag1++;
}
/* do the conversion */
if ( 0 == WideCharToMultiByte( code_page,
0,
lpSrcStr,
cchSrc,
inbuffer,
inbuff_size,
NULL,
NULL ) )
goto error_cleanup;
/* get size required for string mapping */
if ( 0 == (outbuff_size = LCMapStringA( Locale,
dwMapFlags,
inbuffer,
inbuff_size,
NULL,
0 )) )
goto error_cleanup;
/* allocate enough space for chars and NULL */
__try {
outbuffer = (unsigned char *)_alloca( outbuff_size * sizeof(char) );
}
__except(EXCEPTION_EXECUTE_HANDLER) {
_resetstkoflw();
outbuffer = NULL;
}
if ( outbuffer == NULL ) {
if ( (outbuffer = (unsigned char *)_malloc_crt(outbuff_size * sizeof(char)))
== NULL )
goto error_cleanup;
malloc_flag2++;
}
/* do string mapping */
if ( 0 == LCMapStringA( Locale,
dwMapFlags,
inbuffer,
inbuff_size,
outbuffer,
outbuff_size ) )
goto error_cleanup;
if (dwMapFlags & LCMAP_SORTKEY) {
/* outbuff_size > cchDest is allowed */
retval = outbuff_size;
if (0 != cchDest)
/* SORTKEY returns BYTES, just copy */
strncpy( (char *)lpDestStr,
(char *)outbuffer,
cchDest < outbuff_size ? cchDest : outbuff_size );
}
else {
if (0 == cchDest) {
/* get size required */
if ( 0 == (retval = MultiByteToWideChar( code_page,
MB_PRECOMPOSED,
outbuffer,
outbuff_size,
NULL,
0 )) )
goto error_cleanup;
}
else {
/* convert mapping */
if ( 0 == (retval = MultiByteToWideChar( code_page,
MB_PRECOMPOSED,
outbuffer,
outbuff_size,
lpDestStr,
cchDest )) )
goto error_cleanup;
}
}
error_cleanup:
if ( malloc_flag2 )
_free_crt(outbuffer);
if ( malloc_flag1 )
_free_crt(inbuffer);
return retval;
}
else /* f_use is neither USE_A nor USE_W */
return 0;
}