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Edit File: curl_memory.h

#ifndef HEADER_CURL_MEMORY_H #define HEADER_CURL_MEMORY_H /*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, 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 https://curl.haxx.se/docs/copyright.html. * * 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. */ #ifdef HEADER_CURL_MEMDEBUG_H #error "Header memdebug.h shall not be included before curl_memory.h" #endif #ifndef CURLX_NO_MEMORY_CALLBACKS #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); #define CURL_DID_MEMORY_FUNC_TYPEDEFS #endif 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; #endif #ifndef CURLDEBUG /* * 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 #endif /* CURLDEBUG */ #else /* CURLX_NO_MEMORY_CALLBACKS */ #ifndef MEMDEBUG_NODEFINES #define MEMDEBUG_NODEFINES #endif #endif /* CURLX_NO_MEMORY_CALLBACKS */ #endif /* HEADER_CURL_MEMORY_H */