321 lines
12 KiB
C
321 lines
12 KiB
C
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/***
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*w_map.c - W version of LCMapString.
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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 LCMapStringA or LCMapStringW depending on which is 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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* 07-26-94 CFW Bug fix #14730, LCMapString goes past NULLs.
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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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* 02-15-97 RDK For narrow mapping, try W version first so Windows NT
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* can process nonANSI codepage correctly.
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* 03-16-97 RDK Added error flag to __crtLCMapStringA.
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* 05-09-97 GJF Split off from aw_map.c. Revised to use _alloca
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* instead of malloc. Also, reformatted.
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* 05-27-98 GJF Changed wcsncnt() 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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* 04-28-99 GJF Changed dwFlags arg value to 0 in WideCharToMultiByte
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* calls to avoid problems with codepage 1258 on NT 5.0.
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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 <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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#define USE_W 1
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#define USE_A 2
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/***
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*int __cdecl wcsncnt - count wide 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
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* null. If null not found in n chars, then return n.
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*
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*Entry:
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* const wchar_t *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 wide characaters 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 wcsncnt (
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const wchar_t *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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wchar_t *cp = (wchar_t *)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 __crtLCMapStringW - Get type information about a wide string.
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*
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*Purpose:
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* Internal support function. Assumes info in wide string format. Tries
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* to use NLS API call LCMapStringW if available and uses LCMapStringA
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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 dwMapFlags - see NT\Chicago docs
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* LPCWSTR lpSrcStr - pointer to string to be mapped
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* int cchSrc - wide char (word) count of input string
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* (including NULL if any)
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* (-1 if NULL terminated)
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* LPWSTR lpDestStr - pointer to memory to store mapping
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* int cchDest - wide char (word) count of buffer (including NULL)
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* int code_page - for MB/WC conversion. If 0, use __lc_codepage
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*
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* NOTE: if LCMAP_SORTKEY is specified, then cchDest refers to number
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* of BYTES, not number of wide chars. The return string will be
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* a series of bytes with a NULL byte terminator.
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*
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*Exit:
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* Success: if LCMAP_SORKEY:
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* number of bytes written to lpDestStr (including NULL byte
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* terminator)
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* else
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* number of wide characters written to lpDestStr (including
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* NULL)
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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 __crtLCMapStringW(
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LCID Locale,
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DWORD dwMapFlags,
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LPCWSTR lpSrcStr,
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int cchSrc,
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LPWSTR lpDestStr,
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int cchDest,
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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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*/
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if (0 == f_use) {
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if (0 != LCMapStringW(0, LCMAP_LOWERCASE, L"\0", 1, NULL, 0))
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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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* LCMapString will map past NULL. Must find NULL if in string
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* before cchSrc wide characters.
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*/
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if (cchSrc > 0)
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cchSrc = wcsncnt(lpSrcStr, cchSrc);
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/* Use "W" version */
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if (USE_W == f_use) {
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return LCMapStringW( Locale, dwMapFlags, lpSrcStr, cchSrc,
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lpDestStr, cchDest );
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}
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/* Use "A" version */
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if (USE_A == f_use || f_use == 0) {
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int retval = 0;
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int inbuff_size;
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int outbuff_size;
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unsigned char *inbuffer;
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unsigned char *outbuffer;
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int malloc_flag1 = 0;
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int malloc_flag2 = 0;
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int AnsiCP = 0;
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/*
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* Convert string and return the requested information. Note that
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* we are converting to a multibyte string so there is not a
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* one-to-one correspondence between number of wide chars in the
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* input string and the number of *bytes* in the buffer. However,
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* there had *better be* a one-to-one correspondence between the
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* number of wide characters and the number of multibyte characters
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* (enforced by WC_SEPCHARS) in the buffer or the resulting mapped
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* string will be worthless to the user.
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*
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*/
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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 == 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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/*
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* Always use Ansi codepage with Ansi WinAPI because they use
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* Ansi codepage
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*/
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if ( code_page != (AnsiCP = __ansicp(Locale)))
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{
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if (AnsiCP != -1)
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code_page = AnsiCP;
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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 == (inbuff_size = WideCharToMultiByte( code_page,
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0,
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lpSrcStr,
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cchSrc,
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NULL,
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0,
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NULL,
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NULL )) )
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return 0;
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/* allocate enough space for chars */
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__try {
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inbuffer = (unsigned char *)_alloca( inbuff_size * sizeof(char) );
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}
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__except(EXCEPTION_EXECUTE_HANDLER) {
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_resetstkoflw();
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inbuffer = NULL;
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}
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if ( inbuffer == NULL ) {
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if ( (inbuffer = (unsigned char *)_malloc_crt(inbuff_size * sizeof(char)))
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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 == WideCharToMultiByte( code_page,
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0,
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lpSrcStr,
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cchSrc,
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inbuffer,
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inbuff_size,
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NULL,
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NULL ) )
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goto error_cleanup;
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/* get size required for string mapping */
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if ( 0 == (outbuff_size = LCMapStringA( Locale,
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dwMapFlags,
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inbuffer,
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inbuff_size,
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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 and NULL */
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__try {
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outbuffer = (unsigned char *)_alloca( outbuff_size * sizeof(char) );
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}
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__except(EXCEPTION_EXECUTE_HANDLER) {
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_resetstkoflw();
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outbuffer = NULL;
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}
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if ( outbuffer == NULL ) {
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if ( (outbuffer = (unsigned char *)_malloc_crt(outbuff_size * sizeof(char)))
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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 string mapping */
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if ( 0 == LCMapStringA( Locale,
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dwMapFlags,
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inbuffer,
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inbuff_size,
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outbuffer,
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outbuff_size ) )
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goto error_cleanup;
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if (dwMapFlags & LCMAP_SORTKEY) {
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/* outbuff_size > cchDest is allowed */
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retval = outbuff_size;
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if (0 != cchDest)
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/* SORTKEY returns BYTES, just copy */
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strncpy( (char *)lpDestStr,
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(char *)outbuffer,
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cchDest < outbuff_size ? cchDest : outbuff_size );
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}
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else {
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if (0 == cchDest) {
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/* get size required */
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if ( 0 == (retval = MultiByteToWideChar( code_page,
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MB_PRECOMPOSED,
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outbuffer,
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outbuff_size,
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NULL,
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0 )) )
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goto error_cleanup;
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}
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else {
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/* convert mapping */
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if ( 0 == (retval = MultiByteToWideChar( code_page,
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MB_PRECOMPOSED,
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outbuffer,
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outbuff_size,
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lpDestStr,
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cchDest )) )
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goto error_cleanup;
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}
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}
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error_cleanup:
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if ( malloc_flag2 )
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_free_crt(outbuffer);
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if ( malloc_flag1 )
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_free_crt(inbuffer);
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return retval;
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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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