157 lines
6.0 KiB
C
157 lines
6.0 KiB
C
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#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 - 2017, 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 https://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 whether 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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#ifndef CURL_DID_MEMORY_FUNC_TYPEDEFS /* only if not already done */
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/*
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* The following memory function replacement typedef's are COPIED from
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* curl/curl.h and MUST match the originals. We copy them to avoid having to
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* include curl/curl.h here. We avoid that include since it includes stdio.h
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* and other headers that may get messed up with defines done here.
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*/
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typedef void *(*curl_malloc_callback)(size_t size);
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typedef void (*curl_free_callback)(void *ptr);
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typedef void *(*curl_realloc_callback)(void *ptr, size_t size);
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typedef char *(*curl_strdup_callback)(const char *str);
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typedef void *(*curl_calloc_callback)(size_t nmemb, size_t size);
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#define CURL_DID_MEMORY_FUNC_TYPEDEFS
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#endif
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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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