gecko-dev/widget/public/nsStringUtil.h

/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
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// Convience macros for converting nsString's to chars +
// creating temporary char[] bufs.

#ifndef NS_STR_UTIL_H
#define NS_STR_UTIL_H

// temporary char[] macro

// Convience MACROS which use a static char array if possible to reduce
// memory fragmentation, otherwise they allocate a char[] which must be
// freed.  REMEMBER to always use the NS_FREE_CHAR_BUF after using the
// NS_ALLOC_CHAR_BUF. You can not nest NS_ALLOC_CHAR_BUF's. 

#define NS_ALLOC_CHAR_BUF(aBuf, aSize, aActualSize) \
  int _ns_tmpActualSize = aActualSize;              \
  char _ns_smallBuffer[aSize];                      \
  char * const aBuf = _ns_tmpActualSize <= aSize ? _ns_smallBuffer : new char[_ns_tmpActualSize]; 

#define NS_FREE_CHAR_BUF(aBuf)   \
  if (aBuf != _ns_smallBuffer) \
   delete[] aBuf;

#endif // !defined(NS_STR_UTIL_H)