blob: ce38a08cd357d846032e9b36fea5d7f90b5e49f0 [file] [log] [blame]
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
* Copyright (C) 1998 - 2019, Daniel Stenberg, <>, et al.
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
* Nasty internal details ahead...
* File curl_memory.h must be included by _all_ *.c source files
* that use memory related functions strdup, malloc, calloc, realloc
* or free, and given source file is used to build libcurl library.
* It should be included immediately before memdebug.h as the last files
* included to avoid undesired interaction with other memory function
* headers in dependent libraries.
* There is nearly no exception to above rule. All libcurl source
* files in 'lib' subdirectory as well as those living deep inside
* 'packages' subdirectories and linked together in order to build
* libcurl library shall follow it.
* File lib/strdup.c is an exception, given that it provides a strdup
* clone implementation while using malloc. Extra care needed inside
* this one.
* The need for curl_memory.h inclusion is due to libcurl's feature
* of allowing library user to provide memory replacement functions,
* memory callbacks, at runtime with curl_global_init_mem()
* Any *.c source file used to build libcurl library that does not
* include curl_memory.h and uses any memory function of the five
* mentioned above will compile without any indication, but it will
* trigger weird memory related issues at runtime.
* OTOH some source files from 'lib' subdirectory may additionally be
* used directly as source code when using some curlx_ functions by
* third party programs that don't even use libcurl at all. When using
* these source files in this way it is necessary these are compiled
* with CURLX_NO_MEMORY_CALLBACKS defined, in order to ensure that no
* attempt of calling libcurl's memory callbacks is done from code
* which can not use this machinery.
* Notice that libcurl's 'memory tracking' system works chaining into
* the memory callback machinery. This implies that when compiling
* 'lib' source files with CURLX_NO_MEMORY_CALLBACKS defined this file
* disengages usage of libcurl's 'memory tracking' system, defining
* MEMDEBUG_NODEFINES and overriding CURLDEBUG purpose.
* CURLX_NO_MEMORY_CALLBACKS takes precedence over CURLDEBUG. This is
* done in order to allow building a 'memory tracking' enabled libcurl
* and at the same time allow building programs which do not use it.
* Programs and libraries in 'tests' subdirectories have specific
* purposes and needs, and as such each one will use whatever fits
* best, depending additionally whether it links with libcurl or not.
* Caveat emptor. Proper curlx_* separation is a work in progress
* the same as CURLX_NO_MEMORY_CALLBACKS usage, some adjustments may
* still be required. IOW don't use them yet, there are sharp edges.
#error "Header memdebug.h shall not be included before curl_memory.h"
#ifndef CURL_DID_MEMORY_FUNC_TYPEDEFS /* only if not already done */
* The following memory function replacement typedef's are COPIED from
* curl/curl.h and MUST match the originals. We copy them to avoid having to
* include curl/curl.h here. We avoid that include since it includes stdio.h
* and other headers that may get messed up with defines done here.
typedef void *(*curl_malloc_callback)(size_t size);
typedef void (*curl_free_callback)(void *ptr);
typedef void *(*curl_realloc_callback)(void *ptr, size_t size);
typedef char *(*curl_strdup_callback)(const char *str);
typedef void *(*curl_calloc_callback)(size_t nmemb, size_t size);
extern curl_malloc_callback Curl_cmalloc;
extern curl_free_callback Curl_cfree;
extern curl_realloc_callback Curl_crealloc;
extern curl_strdup_callback Curl_cstrdup;
extern curl_calloc_callback Curl_ccalloc;
#if defined(WIN32) && defined(UNICODE)
extern curl_wcsdup_callback Curl_cwcsdup;
* libcurl's 'memory tracking' system defines strdup, malloc, calloc,
* realloc and free, along with others, in memdebug.h in a different
* way although still using memory callbacks forward declared above.
* When using the 'memory tracking' system (CURLDEBUG defined) we do
* not define here the five memory functions given that definitions
* from memdebug.h are the ones that shall be used.
#undef strdup
#define strdup(ptr) Curl_cstrdup(ptr)
#undef malloc
#define malloc(size) Curl_cmalloc(size)
#undef calloc
#define calloc(nbelem,size) Curl_ccalloc(nbelem, size)
#undef realloc
#define realloc(ptr,size) Curl_crealloc(ptr, size)
#undef free
#define free(ptr) Curl_cfree(ptr)
#ifdef WIN32
# ifdef UNICODE
# undef wcsdup
# define wcsdup(ptr) Curl_cwcsdup(ptr)
# undef _wcsdup
# define _wcsdup(ptr) Curl_cwcsdup(ptr)
# undef _tcsdup
# define _tcsdup(ptr) Curl_cwcsdup(ptr)
# else
# undef _tcsdup
# define _tcsdup(ptr) Curl_cstrdup(ptr)
# endif
#endif /* CURLDEBUG */