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//Copyright (c) 1998 - 1999 Microsoft Corporation
/*++
Module Name:
conv.h
Abstract:
UNICODE / ASCII conversion macros
Author:
Hakki T. Bostanci (hakkib) 5-Aug-1998
Revision History:
--*/
#ifndef USES_CONVERSION
// USES_CONVERSION must be defined in every function that uses the
// conversion macros
#define USES_CONVERSION int __nLength; PCWSTR __pUnicode; PCSTR __pAscii
//////////////////////////////////////////////////////////////////////////
//
// W2A
//
// Routine Description:
// Converts a UNICODE string to ASCII. Allocates the coversion buffer
// off the stack using _alloca
//
// Arguments:
// pStr UNICODE string
//
// Return Value:
// the converted ASCII string
//
#define W2A(pStr) \
\ ((__pUnicode = pStr) == 0 ? (PSTR) 0 : ( \ \ __nLength = WideCharToMultiByte( \ CP_ACP, \ 0, \ __pUnicode, \ -1, \ 0, \ 0, \ 0, \ 0 \ ), \ \ __pAscii = (PCSTR) _alloca(__nLength * sizeof(CHAR)), \ \ WideCharToMultiByte( \ CP_ACP, \ 0, \ __pUnicode, \ -1, \ (PSTR) __pAscii, \ __nLength, \ 0, \ 0 \ ), \ \ (PSTR) __pAscii)) \
//////////////////////////////////////////////////////////////////////////
//
// A2W
//
// Routine Description:
// Converts an ASCII string to UNICODE. Allocates the coversion buffer
// off the stack using _alloca
//
// Arguments:
// pStr ASCII string
//
// Return Value:
// the converted UNICODE string
//
#define A2W(pStr) \
\ ((__pAscii = pStr) == 0 ? (PWSTR) 0 : ( \ \ __nLength = MultiByteToWideChar( \ CP_ACP, \ MB_PRECOMPOSED, \ __pAscii, \ -1, \ 0, \ 0 \ ), \ \ __pUnicode = (PCWSTR) _alloca(__nLength * sizeof(WCHAR)), \ \ MultiByteToWideChar( \ CP_ACP, \ MB_PRECOMPOSED, \ __pAscii, \ -1, \ (PWSTR) __pUnicode, \ __nLength \ ), \ \ (PWSTR) __pUnicode)) \
//////////////////////////////////////////////////////////////////////////
//
// T2A, A2T, T2W, W2T
//
// Routine Description:
// These macros expand to the corresponding correct form according to the
// #definition of UNICODE.
//
// We use the cryptic form (__nLength, __pAscii, __pUnicode, pStr) to avoid
// the compiler warning "symbol defined but not used" due to the variables
// defined in USES_CONVERSION macro.
//
#ifdef UNICODE
#define T2A(pStr) W2A(pStr)
#define A2T(pStr) A2W(pStr)
#define T2W(pStr) (__nLength, __pAscii, __pUnicode, pStr)
#define W2T(pStr) (__nLength, __pAscii, __pUnicode, pStr)
#define T2DA(pStr) W2A(pStr)
#define A2DT(pStr) A2W(pStr)
#define T2DW(pStr) _wcsdupa(pStr)
#define W2DT(pStr) _wcsdupa(pStr)
#else //UNICODE
#define T2A(pStr) (__nLength, __pAscii, __pUnicode, pStr)
#define A2T(pStr) (__nLength, __pAscii, __pUnicode, pStr)
#define T2W(pStr) A2W(pStr)
#define W2T(pStr) W2A(pStr)
#define T2DA(pStr) _strdupa(pStr)
#define A2DT(pStr) _strdupa(pStr)
#define T2DW(pStr) A2W(pStr)
#define W2DT(pStr) W2A(pStr)
#endif //UNICODE
//////////////////////////////////////////////////////////////////////////
//
// _tcsdupa
//
// Routine Description:
// Duplicates a string to a buffer allocated off the stack using _alloca
//
// Arguments:
// pStr input string
//
// Return Value:
// duplicated string
//
#define _wcsdupa(pStr) \
\ (__pAscii, (__pUnicode = pStr) == 0 ? (PWSTR) 0 : ( \ \ __nLength = wcslen(__pUnicode) + 1, \ \ wcscpy((PWSTR) _alloca(__nLength * sizeof(WCHAR)), __pUnicode))) \
#define _strdupa(pStr) \
\ (__pUnicode, (__pAscii = pStr) == 0 ? (PSTR) 0 : ( \ \ __nLength = strlen(__pAscii) + 1, \ \ strcpy((PSTR) _alloca(__nLength * sizeof(CHAR)), __pAscii))) \
#ifdef UNICODE
#define _tcsdupa _wcsdupa
#else
#define _tcsdupa _strdupa
#endif
#endif //USES_CONVERSION
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