48 lines
2.0 KiB
C
48 lines
2.0 KiB
C
// --------------------------------------------------------------------------------
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// Stackstr.h
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// Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
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// --------------------------------------------------------------------------------
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#ifndef __STACKSTR_H
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#define __STACKSTR_H
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// --------------------------------------------------------------------------------
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// Use this macro to define a stack string within a function
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// --------------------------------------------------------------------------------
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#define STACKSTRING_DEFINE(_name, _size) \
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struct { \
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CHAR szScratch[_size]; \
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LPSTR pszVal; \
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} _name = { '0', NULL };
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// --------------------------------------------------------------------------------
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// Use this macro to insure that _name::pszVal can hold _cchVal. This macro
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// depends on the local variable 'hr', and that there is a label named 'exit' at
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// the end of your function.
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// --------------------------------------------------------------------------------
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#define STACKSTRING_SETSIZE(_name, _cchVal) \
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if (NULL != _name.pszVal && _name.pszVal != _name.szScratch) { \
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LPSTR psz = (LPSTR)g_pMalloc->Realloc(_name.pszVal, _cchVal); \
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if (NULL == psz) { \
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hr = TrapError(E_OUTOFMEMORY); \
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goto exit; \
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} \
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_name.pszVal = psz; \
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} \
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else if (_cchVal <= sizeof(_name.szScratch)) { \
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_name.pszVal = _name.szScratch; \
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} \
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else { \
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_name.pszVal = (LPSTR)g_pMalloc->Alloc(_cchVal); \
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}
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// --------------------------------------------------------------------------------
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// Use this macro to free a stack string
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// --------------------------------------------------------------------------------
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#define STACKSTRING_FREE(_name) \
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if (NULL != _name.pszVal && _name.pszVal != _name.szScratch) { \
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g_pMalloc->Free(_name.pszVal); \
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_name.pszVal = NULL; \
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}
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#endif // __STACKSTR_H
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