/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_sys_git_alloc_h__
#define INCLUDE_sys_git_alloc_h__
#include "git2/common.h"
GIT_BEGIN_DECL
/**
* An instance for a custom memory allocator
*
* Setting the pointers of this structure allows the developer to implement
* custom memory allocators. The global memory allocator can be set by using
* "GIT_OPT_SET_ALLOCATOR" with the `git_libgit2_opts` function. Keep in mind
* that all fields need to be set to a proper function.
*/
typedef struct {
/** Allocate `n` bytes of memory */
void * GIT_CALLBACK(gmalloc)(size_t n, const char *file, int line);
/**
* Allocate memory for an array of `nelem` elements, where each element
* has a size of `elsize`. Returned memory shall be initialized to
* all-zeroes
*/
void * GIT_CALLBACK(gcalloc)(size_t nelem, size_t elsize, const char *file, int line);
/** Allocate memory for the string `str` and duplicate its contents. */
char * GIT_CALLBACK(gstrdup)(const char *str, const char *file, int line);
/**
* Equivalent to the `gstrdup` function, but only duplicating at most
* `n + 1` bytes
*/
char * GIT_CALLBACK(gstrndup)(const char *str, size_t n, const char *file, int line);
/**
* Equivalent to `gstrndup`, but will always duplicate exactly `n` bytes
* of `str`. Thus, out of bounds reads at `str` may happen.
*/
char * GIT_CALLBACK(gsubstrdup)(const char *str, size_t n, const char *file, int line);
/**
* This function shall deallocate the old object `ptr` and return a
* pointer to a new object that has the size specified by `size`. In
* case `ptr` is `NULL`, a new array shall be allocated.
*/
void * GIT_CALLBACK(grealloc)(void *ptr, size_t size, const char *file, int line);
/**
* This function shall be equivalent to `grealloc`, but allocating
* `neleme * elsize` bytes.
*/
void * GIT_CALLBACK(greallocarray)(void *ptr, size_t nelem, size_t elsize, const char *file, int line);
/**
* This function shall allocate a new array of `nelem` elements, where
* each element has a size of `elsize` bytes.
*/
void * GIT_CALLBACK(gmallocarray)(size_t nelem, size_t elsize, const char *file, int line);
/**
* This function shall free the memory pointed to by `ptr`. In case
* `ptr` is `NULL`, this shall be a no-op.
*/
void GIT_CALLBACK(gfree)(void *ptr);
} git_allocator;
/**
* Initialize the allocator structure to use the `stdalloc` pointer.
*
* Set up the structure so that all of its members are using the standard
* "stdalloc" allocator functions. The structure can then be used with
* `git_allocator_setup`.
*
* @param allocator The allocator that is to be initialized.
* @return An error code or 0.
*/
int git_stdalloc_init_allocator(git_allocator *allocator);
/**
* Initialize the allocator structure to use the `crtdbg` pointer.
*
* Set up the structure so that all of its members are using the "crtdbg"
* allocator functions. Note that this allocator is only available on Windows
* platforms and only if libgit2 is being compiled with "-DMSVC_CRTDBG".
*
* @param allocator The allocator that is to be initialized.
* @return An error code or 0.
*/
int git_win32_crtdbg_init_allocator(git_allocator *allocator);
GIT_END_DECL
#endif
