thodg/libgit2/src/allocators/win32_crtdbg.c

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• Hash : 765ff6e0
  Author :
  Date : 2019-02-21T12:35:48
  

  allocators: make crtdbg allocator reuse its own realloc In commit 6e0dfc6ff (Make stdalloc__reallocarray call stdalloc__realloc, 2019-02-16), we have changed the stdalloc allocator to reuse `stdalloc__realloc` to implement `stdalloc__reallocarray`. This commit is making the same change for the Windows-specific crtdbg allocator to avoid code duplication.

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• src/allocators/win32_crtdbg.c

• /*
   * 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.
   */
  
  #include "win32_crtdbg.h"
  
  #if defined(GIT_MSVC_CRTDBG)
  
  #include "win32/w32_crtdbg_stacktrace.h"
  
  static void *crtdbg__malloc(size_t len, const char *file, int line)
  {
  	void *ptr = _malloc_dbg(len, _NORMAL_BLOCK, git_win32__crtdbg_stacktrace(1,file), line);
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static void *crtdbg__calloc(size_t nelem, size_t elsize, const char *file, int line)
  {
  	void *ptr = _calloc_dbg(nelem, elsize, _NORMAL_BLOCK, git_win32__crtdbg_stacktrace(1,file), line);
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static char *crtdbg__strdup(const char *str, const char *file, int line)
  {
  	char *ptr = _strdup_dbg(str, _NORMAL_BLOCK, git_win32__crtdbg_stacktrace(1,file), line);
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static char *crtdbg__strndup(const char *str, size_t n, const char *file, int line)
  {
  	size_t length = 0, alloclength;
  	char *ptr;
  
  	length = p_strnlen(str, n);
  
  	if (GIT_ADD_SIZET_OVERFLOW(&alloclength, length, 1) ||
  		!(ptr = crtdbg__malloc(alloclength, file, line)))
  		return NULL;
  
  	if (length)
  		memcpy(ptr, str, length);
  
  	ptr[length] = '\0';
  
  	return ptr;
  }
  
  static char *crtdbg__substrdup(const char *start, size_t n, const char *file, int line)
  {
  	char *ptr;
  	size_t alloclen;
  
  	if (GIT_ADD_SIZET_OVERFLOW(&alloclen, n, 1) ||
  		!(ptr = crtdbg__malloc(alloclen, file, line)))
  		return NULL;
  
  	memcpy(ptr, start, n);
  	ptr[n] = '\0';
  	return ptr;
  }
  
  static void *crtdbg__realloc(void *ptr, size_t size, const char *file, int line)
  {
  	void *new_ptr = _realloc_dbg(ptr, size, _NORMAL_BLOCK, git_win32__crtdbg_stacktrace(1,file), line);
  	if (!new_ptr) git_error_set_oom();
  	return new_ptr;
  }
  
  static void *crtdbg__reallocarray(void *ptr, size_t nelem, size_t elsize, const char *file, int line)
  {
  	size_t newsize;
  
  	if (GIT_MULTIPLY_SIZET_OVERFLOW(&newsize, nelem, elsize))
  		return NULL;
  
  	return crtdbg__realloc(ptr, newsize, file, line);
  }
  
  static void *crtdbg__mallocarray(size_t nelem, size_t elsize, const char *file, int line)
  {
  	return crtdbg__reallocarray(NULL, nelem, elsize, file, line);
  }
  
  static void crtdbg__free(void *ptr)
  {
  	free(ptr);
  }
  
  int git_win32_crtdbg_init_allocator(git_allocator *allocator)
  {
  	allocator->gmalloc = crtdbg__malloc;
  	allocator->gcalloc = crtdbg__calloc;
  	allocator->gstrdup = crtdbg__strdup;
  	allocator->gstrndup = crtdbg__strndup;
  	allocator->gsubstrdup = crtdbg__substrdup;
  	allocator->grealloc = crtdbg__realloc;
  	allocator->greallocarray = crtdbg__reallocarray;
  	allocator->gmallocarray = crtdbg__mallocarray;
  	allocator->gfree = crtdbg__free;
  	return 0;
  }
  
  #else
  
  int git_win32_crtdbg_init_allocator(git_allocator *allocator)
  {
  	GIT_UNUSED(allocator);
  	git_error_set(GIT_EINVALID, "crtdbg memory allocator not available");
  	return -1;
  }
  
  #endif
  

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