400 lines
15 KiB
C
400 lines
15 KiB
C
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/***
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*a_map.c - A 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 Renamed and moved __crtLCMapStringW into a separate
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* file. Revised to use _alloca instead of malloc. Also,
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* reformatted.
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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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* 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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* 07-07-01 BWT Fix error path (set ret=FALSE before branching, not after)
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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 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
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* null. If null is 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 __crtLCMapStringA - 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 LCMapStringA if available and uses LCMapStringW
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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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* LPCSTR 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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* LPSTR lpDestStr - pointer to memory to store mapping
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* int cchDest - char (byte) 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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* BOOL bError - TRUE if MB_ERR_INVALID_CHARS set on call to
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* MultiByteToWideChar when GetStringTypeW used.
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*
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*Exit:
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* Success: number of chars written to lpDestStr (including 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 __crtLCMapStringA(
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LCID Locale,
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DWORD dwMapFlags,
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LPCSTR lpSrcStr,
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int cchSrc,
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LPSTR lpDestStr,
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int cchDest,
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int code_page,
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BOOL bError
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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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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 characters.
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*/
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if (cchSrc > 0)
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cchSrc = strncnt(lpSrcStr, cchSrc);
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/* Use "A" version */
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if (USE_A == f_use || f_use == 0) {
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char *cbuffer = NULL;
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char *cbuffer1 = NULL;
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int ret;
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int malloc_flag1 = 0;
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int AnsiCP;
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int buff_size;
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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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/* LCMapStringA uses ANSI code page to map the string. Check if
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* codepage is ansi, if not convert the input string to ansi
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* codepage then map to a temporary string and then convert temp
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* string to DestStr.
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*/
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if ( AnsiCP != code_page)
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{
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cbuffer = __convertcp(code_page, AnsiCP, lpSrcStr, &cchSrc, NULL, 0);
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if (cbuffer == NULL)
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return FALSE;
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lpSrcStr = cbuffer;
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if (0 == (buff_size = LCMapStringA( Locale,
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dwMapFlags,
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lpSrcStr,
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cchSrc,
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0,
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0 )))
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{
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ret = FALSE;
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goto cleanupA;
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}
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__try{
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cbuffer1 = (char *)_alloca(sizeof(char) * buff_size);
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memset(cbuffer1, 0, sizeof(char) * buff_size);
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} __except (EXCEPTION_EXECUTE_HANDLER) {
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_resetstkoflw();
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cbuffer1 = NULL;
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}
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if ( cbuffer1 == NULL ) {
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if ( (cbuffer1 = (char *)_malloc_crt(sizeof(char) * buff_size)) == NULL)
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{
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ret = FALSE;
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goto cleanupA;
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}
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(void)memset( cbuffer1, 0, sizeof(char) * buff_size);
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malloc_flag1++;
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}
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if (0 == (buff_size = LCMapStringA( Locale,
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dwMapFlags,
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lpSrcStr,
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cchSrc,
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cbuffer1,
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buff_size)))
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{
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ret = FALSE;
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} else {
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if ( NULL == __convertcp(AnsiCP,
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code_page,
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cbuffer1,
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&buff_size,
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lpDestStr,
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cchDest))
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ret = FALSE;
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else
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ret = TRUE;
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}
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cleanupA:
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if(malloc_flag1)
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_free_crt(cbuffer1);
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} else
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{
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ret = LCMapStringA( Locale, dwMapFlags, lpSrcStr, cchSrc,
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lpDestStr, cchDest );
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}
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if ( cbuffer != NULL)
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_free_crt(cbuffer);
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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 retval = 0;
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int inbuff_size;
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int outbuff_size;
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wchar_t *inwbuffer;
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wchar_t *outwbuffer;
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int malloc_flag1 = 0;
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int malloc_flag2 = 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 wide 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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* or the resulting mapped string will be worthless to the user.
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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 == code_page)
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code_page = __lc_codepage;
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/* find out how big a buffer we need (includes NULL if any) */
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if ( 0 == (inbuff_size =
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MultiByteToWideChar( code_page,
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bError ? MB_PRECOMPOSED |
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MB_ERR_INVALID_CHARS :
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MB_PRECOMPOSED,
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lpSrcStr,
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cchSrc,
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NULL,
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0 )) )
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return 0;
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/* allocate enough space for wide chars */
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__try {
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inwbuffer = (wchar_t *)_alloca( inbuff_size * sizeof(wchar_t) );
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}
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__except(EXCEPTION_EXECUTE_HANDLER) {
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_resetstkoflw();
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inwbuffer = NULL;
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}
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if ( inwbuffer == NULL ) {
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if ( (inwbuffer = (wchar_t *)_malloc_crt(inbuff_size * 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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lpSrcStr,
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cchSrc,
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inwbuffer,
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inbuff_size) )
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goto error_cleanup;
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/* get size required for string mapping */
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if ( 0 == (retval = LCMapStringW( Locale,
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dwMapFlags,
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inwbuffer,
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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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if (dwMapFlags & LCMAP_SORTKEY) {
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/* retval is size in BYTES */
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if (0 != cchDest) {
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if (retval > cchDest)
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goto error_cleanup;
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/* do string mapping */
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if ( 0 == LCMapStringW( Locale,
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dwMapFlags,
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inwbuffer,
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inbuff_size,
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(LPWSTR)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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else {
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/* retval is size in wide chars */
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outbuff_size = retval;
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/* allocate enough space for wide chars (includes NULL if any) */
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__try {
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outwbuffer = (wchar_t *)_alloca( outbuff_size * sizeof(wchar_t) );
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}
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__except(EXCEPTION_EXECUTE_HANDLER) {
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_resetstkoflw();
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outwbuffer = NULL;
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}
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if ( outwbuffer == NULL ) {
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if ( (outwbuffer = (wchar_t *)_malloc_crt(outbuff_size * 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 string mapping */
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if ( 0 == LCMapStringW( Locale,
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dwMapFlags,
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inwbuffer,
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inbuff_size,
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outwbuffer,
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outbuff_size ) )
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goto error_cleanup;
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if (0 == cchDest) {
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/* get size required */
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if ( 0 == (retval =
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WideCharToMultiByte( code_page,
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0,
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outwbuffer,
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outbuff_size,
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NULL,
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0,
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NULL,
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NULL )) )
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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 =
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WideCharToMultiByte( code_page,
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0,
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outwbuffer,
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outbuff_size,
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lpDestStr,
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cchDest,
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NULL,
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NULL )) )
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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(outwbuffer);
|
||
|
|
|
||
|
|
if ( malloc_flag1 )
|
||
|
|
_free_crt(inwbuffer);
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
else /* f_use is neither USE_A nor USE_W */
|
||
|
|
return 0;
|
||
|
|
}
|