gecko-dev/widget/public/nsStringUtil.h

80 строки
3.2 KiB
C

/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
// Convience macros for converting nsString's to chars +
// creating temporary char[] bufs.
#ifndef NS_STR_UTIL_H
#define NS_STR_UTIL_H
// nsString to temporary char[] macro
// Convience MACROS to convert an nsString to a char * 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_STR_BUF after using the
// NS_ALLOC_STR_BUF. You can not nest NS_ALLOC_STR_BUF's.
#define NS_ALLOC_STR_BUF(varName, strName, tempSize) \
static const int _ns_kSmallBufferSize = tempSize; \
char* varName = 0; \
int _ns_smallBufUsed = 0; \
char _ns_smallBuffer[_ns_kSmallBufferSize]; \
if (strName.Length() < (_ns_kSmallBufferSize - 1)) { \
strName.ToCString(_ns_smallBuffer, _ns_kSmallBufferSize); \
_ns_smallBuffer[_ns_kSmallBufferSize - 1] = '\0'; \
_ns_smallBufUsed = 1; \
varName = _ns_smallBuffer; \
} \
else { \
varName = strName.ToNewCString(); \
}
#define NS_FREE_STR_BUF(varName) \
if (! _ns_smallBufUsed) \
delete varName;
// Create temporary char[] macro
//
// Create a temporary buffer for storing chars.
// If the actual size is > size then the buffer
// is allocated from the heap, otherwise the buffer
// is a stack variable. REMEMBER: use NS_FREE_BUF
// when finished with the buffer allocated, and do
// NOT nest INSERT_BUF'S.
#define NS_ALLOC_CHAR_BUF(aBuf, aSize, aActualSize) \
char *aBuf; \
int _ns_smallBufUsed = 0; \
static const int _ns_kSmallBufferSize = aSize; \
if (aActualSize < _ns_kSmallBufferSize) { \
char _ns_smallBuffer[_ns_kSmallBufferSize]; \
aBuf = _ns_smallBuffer; \
_ns_smallBufUsed = 1; \
} \
else { \
aBuf = new char[aActualSize]; \
}
#define NS_FREE_CHAR_BUF(aBuf) \
if (! _ns_smallBufUsed) \
delete aBuf;
#endif // NSStringUtil