222 lines
8.2 KiB
C
222 lines
8.2 KiB
C
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/***
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*a_str.c - A version of GetStringType.
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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 GetStringTypeA or GetStringTypeW depending on which is
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* unstubbed.
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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 Remove bad verification test from "A" version.
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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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* 04-18-94 CFW Use lcid value if passed in.
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* 04-18-94 CFW Use calloc and don't test the NULL.
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* 10-24-94 CFW Must verify GetStringType return.
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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 string type, try W version first so
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* Windows NT can process nonANSI codepage correctly.
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* 03-16-97 RDK Added error flag to __crtGetStringTypeA.
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* 05-12-97 GJF Renamed and moved __crtGetStringTypeW into a separate
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* file. Revised to use _alloca instead of malloc. Also,
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* removed some silly code and reformatted.
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* 08-18-98 GJF Use _malloc_crt if _alloca fails.
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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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#include <awint.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 __crtGetStringTypeA - 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 GetStringTypeA if available and uses GetStringTypeW
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* if it must. If neither are available it fails and returns FALSE.
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*
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*Entry:
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* DWORD dwInfoType - see NT\Chicago docs
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* LPCSTR lpSrcStr - char (byte) string for which character types
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* are requested
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* int cchSrc - char (byte) count of lpSrcStr (including NULL
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* if any)
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* LPWORD lpCharType - word array to receive character type information
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* (must be twice the size of lpSrcStr)
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* int code_page - for MB/WC conversion. If 0, use __lc_codepage
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* int lcid - for A call, specify LCID, If 0, use
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* __lc_handle[LC_CTYPE].
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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: TRUE
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* Failure: FALSE
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*
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*Exceptions:
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*
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*******************************************************************************/
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BOOL __cdecl __crtGetStringTypeA(
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DWORD dwInfoType,
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LPCSTR lpSrcStr,
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int cchSrc,
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LPWORD lpCharType,
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int code_page,
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int lcid,
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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
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* flavor. 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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{
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unsigned short dummy;
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if (0 != GetStringTypeW(CT_CTYPE1, L"\0", 1, &dummy))
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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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/* Use "A" version */
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if (USE_A == f_use || f_use == 0)
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{
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char *cbuffer = NULL;
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int ret;
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int AnsiCP;
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if (0 == lcid)
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lcid = __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(lcid)))
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return FALSE;
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/* If current code-page is not ansi code page, convert it to ansi code page
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* as GetStringTypeA uses ansi code page to find the strig type.
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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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}
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ret = GetStringTypeA(lcid, dwInfoType, lpSrcStr, cchSrc, lpCharType);
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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 retval1;
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int buff_size;
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wchar_t *wbuffer;
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BOOL retval2 = FALSE;
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int malloc_flag = 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 character string so there is not a
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* one-to-one correspondence between number of multibyte chars in the
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* input string and the number of wide chars 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 multibyte characters and the number of WORDs in the
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* return buffer.
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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 */
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if ( 0 == (buff_size = MultiByteToWideChar( code_page,
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bError ?
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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 FALSE;
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/* allocate enough space for wide chars */
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__try {
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wbuffer = (wchar_t *)_alloca( sizeof(wchar_t) * buff_size );
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(void)memset( wbuffer, 0, sizeof(wchar_t) * buff_size );
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}
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__except( EXCEPTION_EXECUTE_HANDLER ) {
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_resetstkoflw();
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wbuffer = NULL;
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}
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if ( wbuffer == NULL ) {
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if ( (wbuffer = (wchar_t *)_calloc_crt(sizeof(wchar_t), buff_size))
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== NULL )
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return FALSE;
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malloc_flag++;
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}
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/* do the conversion */
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if ( 0 != (retval1 = MultiByteToWideChar( code_page,
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MB_PRECOMPOSED,
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lpSrcStr,
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cchSrc,
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wbuffer,
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buff_size )) )
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/* obtain result */
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retval2 = GetStringTypeW( dwInfoType,
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wbuffer,
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retval1,
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lpCharType );
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if ( malloc_flag )
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_free_crt(wbuffer);
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return retval2;
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}
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else /* f_use is neither USE_A nor USE_W */
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return FALSE;
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}
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