97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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/***
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*a_env.c - A version of GetEnvironmentStrings.
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Use GetEnvironmentStringsW if available, otherwise use A version.
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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 <awint.h>
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#include <dbgint.h>
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/***
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*LPVOID __cdecl __crtGetEnvironmentStringsA - Get normal environment block
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*
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*Purpose:
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* Internal support function. Since GetEnvironmentStrings returns in OEM
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* and we want ANSI (note that GetEnvironmentVariable returns ANSI!) and
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* SetFileApistoAnsi() does not affect it, we have no choice but to
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* obtain the block in wide character and convert to ANSI.
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*
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*Entry:
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* VOID
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*
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*Exit:
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* LPVOID - pointer to environment block
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*
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*Exceptions:
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*
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*******************************************************************************/
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LPVOID __cdecl __crtGetEnvironmentStringsA(
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VOID
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)
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{
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wchar_t *wEnv;
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wchar_t *wTmp;
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char *aEnv = NULL;
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int nSizeW;
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int nSizeA;
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/* obtain wide environment block */
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if ( NULL == (wEnv = GetEnvironmentStringsW()) )
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return NULL;
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/* look for double null that indicates end of block */
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wTmp = wEnv;
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while ( *wTmp != L'\0' ) {
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if ( *++wTmp == L'\0' )
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wTmp++;
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}
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/* calculate total size of block, including all nulls */
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nSizeW = (int)(wTmp - wEnv + 1);
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/* find out how much space needed for multi-byte environment */
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nSizeA = WideCharToMultiByte( CP_ACP,
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0,
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wEnv,
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nSizeW,
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NULL,
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0,
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NULL,
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NULL );
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/* allocate space for multi-byte string */
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if ( (nSizeA == 0) ||
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((aEnv = (char *)_malloc_crt(nSizeA)) == NULL) )
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{
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FreeEnvironmentStringsW( wEnv );
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return NULL;
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}
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/* do the conversion */
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if ( !WideCharToMultiByte( CP_ACP,
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0,
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wEnv,
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nSizeW,
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aEnv,
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nSizeA,
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NULL,
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NULL ) )
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{
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_free_crt( aEnv );
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aEnv = NULL;
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}
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FreeEnvironmentStringsW( wEnv );
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return aEnv;
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}
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