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This header file must be included after all header files except memdebug.h, as it does similar memory function redefinitions and can be similarly affected by conflicting definitions in system or dependent library headers.
144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
#ifndef HEADER_CURL_MEMORY_H
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#define HEADER_CURL_MEMORY_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/*
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* Nasty internal details ahead...
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*
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* File curl_memory.h must be included by _all_ *.c source files
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* that use memory related functions strdup, malloc, calloc, realloc
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* or free, and given source file is used to build libcurl library.
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* It should be included immediately before memdebug.h as the last files
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* included to avoid undesired interaction with other memory function
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* headers in dependent libraries.
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*
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* There is nearly no exception to above rule. All libcurl source
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* files in 'lib' subdirectory as well as those living deep inside
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* 'packages' subdirectories and linked together in order to build
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* libcurl library shall follow it.
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*
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* File lib/strdup.c is an exception, given that it provides a strdup
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* clone implementation while using malloc. Extra care needed inside
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* this one. TODO: revisit this paragraph and related code.
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*
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* The need for curl_memory.h inclusion is due to libcurl's feature
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* of allowing library user to provide memory replacement functions,
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* memory callbacks, at runtime with curl_global_init_mem()
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*
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* Any *.c source file used to build libcurl library that does not
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* include curl_memory.h and uses any memory function of the five
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* mentioned above will compile without any indication, but it will
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* trigger weird memory related issues at runtime.
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*
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* OTOH some source files from 'lib' subdirectory may additionally be
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* used directly as source code when using some curlx_ functions by
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* third party programs that don't even use libcurl at all. When using
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* these source files in this way it is necessary these are compiled
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* with CURLX_NO_MEMORY_CALLBACKS defined, in order to ensure that no
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* attempt of calling libcurl's memory callbacks is done from code
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* which can not use this machinery.
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*
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* Notice that libcurl's 'memory tracking' system works chaining into
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* the memory callback machinery. This implies that when compiling
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* 'lib' source files with CURLX_NO_MEMORY_CALLBACKS defined this file
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* disengages usage of libcurl's 'memory tracking' system, defining
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* MEMDEBUG_NODEFINES and overriding CURLDEBUG purpose.
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*
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* CURLX_NO_MEMORY_CALLBACKS takes precedence over CURLDEBUG. This is
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* done in order to allow building a 'memory tracking' enabled libcurl
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* and at the same time allow building programs which do not use it.
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*
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* Programs and libraries in 'tests' subdirectories have specific
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* purposes and needs, and as such each one will use whatever fits
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* best, depending additionally wether it links with libcurl or not.
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*
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* Caveat emptor. Proper curlx_* separation is a work in progress
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* the same as CURLX_NO_MEMORY_CALLBACKS usage, some adjustments may
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* still be required. IOW don't use them yet, there are sharp edges.
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*/
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#ifdef HEADER_CURL_MEMDEBUG_H
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#error "Header memdebug.h shall not be included before curl_memory.h"
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#endif
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#ifndef CURLX_NO_MEMORY_CALLBACKS
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#include <curl/curl.h> /* for the callback typedefs */
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extern curl_malloc_callback Curl_cmalloc;
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extern curl_free_callback Curl_cfree;
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extern curl_realloc_callback Curl_crealloc;
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extern curl_strdup_callback Curl_cstrdup;
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extern curl_calloc_callback Curl_ccalloc;
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#if defined(WIN32) && defined(UNICODE)
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extern curl_wcsdup_callback Curl_cwcsdup;
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#endif
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#ifndef CURLDEBUG
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/*
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* libcurl's 'memory tracking' system defines strdup, malloc, calloc,
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* realloc and free, along with others, in memdebug.h in a different
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* way although still using memory callbacks forward declared above.
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* When using the 'memory tracking' system (CURLDEBUG defined) we do
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* not define here the five memory functions given that definitions
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* from memdebug.h are the ones that shall be used.
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*/
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#undef strdup
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#define strdup(ptr) Curl_cstrdup(ptr)
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#undef malloc
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#define malloc(size) Curl_cmalloc(size)
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#undef calloc
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#define calloc(nbelem,size) Curl_ccalloc(nbelem, size)
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#undef realloc
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#define realloc(ptr,size) Curl_crealloc(ptr, size)
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#undef free
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#define free(ptr) Curl_cfree(ptr)
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#ifdef WIN32
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# ifdef UNICODE
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# undef wcsdup
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# define wcsdup(ptr) Curl_cwcsdup(ptr)
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# undef _wcsdup
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# define _wcsdup(ptr) Curl_cwcsdup(ptr)
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# undef _tcsdup
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# define _tcsdup(ptr) Curl_cwcsdup(ptr)
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# else
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# undef _tcsdup
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# define _tcsdup(ptr) Curl_cstrdup(ptr)
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# endif
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#endif
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#endif /* CURLDEBUG */
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#else /* CURLX_NO_MEMORY_CALLBACKS */
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#ifndef MEMDEBUG_NODEFINES
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#define MEMDEBUG_NODEFINES
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#endif
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#endif /* CURLX_NO_MEMORY_CALLBACKS */
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#endif /* HEADER_CURL_MEMORY_H */
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