171 lines
5.2 KiB
C
171 lines
5.2 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1995.
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//
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// File: thunktxt.c
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//
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// Contents: Support routines to thunk API parameters ANSI <-> UNICODE
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//
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// Functions: ConvertStrings()
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//
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// History: 2-03-95 davepl Created
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//
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//--------------------------------------------------------------------------
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#include <shellprv.h>
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#pragma hdrstop
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//+-------------------------------------------------------------------------
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//
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// Function: ConvertStrings
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//
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// Synopsis: Converts a series of XCHAR strings into TCHAR strings,
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// packed as a series of pointers followed by a contiguous
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// block of memory where the output strings are stored.
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//
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// Eg: ConvertStrings(4, "Hello", "", NULL, "World");
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//
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// Returns a pointer to a block of memory as follows:
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//
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// 4 bytes <address of L"Hello">
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// 4 bytes <address of L"">
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// 4 bytes NULL
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// 4 bytes <address of L"World">
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// 12 bytes L"Hello\0"
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// 2 bytes L"\0"
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// 12 bytes L"World\0"
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// ---------------------------------------------------
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// 42 bytes
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//
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// The strings may then be referenced as ThunkText.m_pStr[0],
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// [1], [2], and [3], where [2] is a NULL pointer.
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//
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// When the caller is finished with the strings, the entire
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// block should be freed via LocalAlloc().
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//
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// Arguments: [cCount] -- Number of strings passed, incl NULs
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// [pszOriginalString] -- The strings to convert
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// (... etc ...)
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//
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// Returns: Pointer to a ThunkText structure
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//
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// History: 2-03-95 davepl Created
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//
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// Notes: In UNICODE builds, converts ANSI to UNICODE. In ANSI
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// builds, converts to UNICODE (if present).
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//
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//--------------------------------------------------------------------------
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#ifdef UNICODE
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ThunkText * ConvertStrings(UINT cCount, ...)
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{
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ThunkText * pThunkText = NULL;
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UINT cTmp;
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LPXSTR pXChar;
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va_list vaListMarker;
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//
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// Byte count is size of fixed members plus cCount pointers. cbOffset
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// is the offset at which we will begin dumping strings into the struct
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//
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UINT cbStructSize = SIZEOF(ThunkText) + (cCount - 1) * SIZEOF(LPTSTR);
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UINT cbOffset = cbStructSize;
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//
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// Scan the list of input strings, and add their lengths (in bytes, once
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// converted to TCHARs, incl NUL) to the output structure size
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//
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cTmp = 0;
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va_start(vaListMarker, cCount);
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do
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{
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pXChar = va_arg(vaListMarker, LPXSTR);
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if (pXChar)
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{
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cbStructSize += (lstrlenX(pXChar) + 1) * SIZEOF(TCHAR);
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}
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cTmp++;
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}
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while (cTmp < cCount);
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//
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// Allocate the output structure.
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//
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pThunkText = (ThunkText *) LocalAlloc(LMEM_FIXED, cbStructSize);
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if (NULL == pThunkText)
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{
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SetLastError((DWORD)E_OUTOFMEMORY);
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return NULL;
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}
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//
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// Convert each of the input strings into the allocated output
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// buffer.
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//
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cTmp = 0;
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va_start(vaListMarker, cCount);
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do
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{
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INT cchResult;
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pXChar = va_arg(vaListMarker, LPXSTR); // grab next src XSTR
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if (NULL == pXChar)
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{
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pThunkText->m_pStr[cTmp] = NULL;
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}
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else
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{
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pThunkText->m_pStr[cTmp] = (LPTSTR)(((LPBYTE)pThunkText) + cbOffset);
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#ifdef UNICODE
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cchResult = MultiByteToWideChar(CP_ACP, // code page
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0, // flags
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pXChar, // source XCHAR
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-1, // assume NUL term
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pThunkText->m_pStr[cTmp], //outbuf
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(cbStructSize - cbOffset) / sizeof(WCHAR) ); //buflen
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#else
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cchResult = WideCharToMultiByte(CP_ACP, // code page
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0, // flags
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pXChar, // source XCHAR
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-1, // assume NUL term
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pThunkText->m_pStr[cTmp], //outbuf
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(cbStructSize - cbOffset) / sizeof(CHAR), //buflen
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NULL, // default char
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NULL); // &fDefUsed
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#endif
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//
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// Even a NUL string returns a 1 character conversion, so 0 means
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// the conversion failed. Cleanup and bail.
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//
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if (0 == cchResult)
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{
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LocalFree(pThunkText);
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SetLastError((DWORD)E_FAIL);
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return NULL;
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}
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cbOffset += cchResult * SIZEOF(TCHAR);
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}
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cTmp++;
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} while (cTmp < cCount);
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return pThunkText;
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}
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#endif // UNICODE
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