thodg/libgit2/src/stdalloc.c

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• Hash : 6e0dfc6f
  Author :
  Date : 2019-02-16T20:26:17
  

  Make stdalloc__reallocarray call stdalloc__realloc This change avoids calling realloc(3) in more than one place.

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• src/stdalloc.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 "stdalloc.h"
  
  static void *stdalloc__malloc(size_t len, const char *file, int line)
  {
  	void *ptr = malloc(len);
  
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static void *stdalloc__calloc(size_t nelem, size_t elsize, const char *file, int line)
  {
  	void *ptr = calloc(nelem, elsize);
  
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static char *stdalloc__strdup(const char *str, const char *file, int line)
  {
  	char *ptr = strdup(str);
  
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	if (!ptr) git_error_set_oom();
  	return ptr;
  }
  
  static char *stdalloc__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 = stdalloc__malloc(alloclength, file, line)))
  		return NULL;
  
  	if (length)
  		memcpy(ptr, str, length);
  
  	ptr[length] = '\0';
  
  	return ptr;
  }
  
  static char *stdalloc__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 = stdalloc__malloc(alloclen, file, line)))
  		return NULL;
  
  	memcpy(ptr, start, n);
  	ptr[n] = '\0';
  	return ptr;
  }
  
  static void *stdalloc__realloc(void *ptr, size_t size, const char *file, int line)
  {
  	void *new_ptr = realloc(ptr, size);
  
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	if (!new_ptr) git_error_set_oom();
  	return new_ptr;
  }
  
  static void *stdalloc__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 stdalloc__realloc(ptr, newsize, file, line);
  }
  
  static void *stdalloc__mallocarray(size_t nelem, size_t elsize, const char *file, int line)
  {
  	return stdalloc__reallocarray(NULL, nelem, elsize, file, line);
  }
  
  static void stdalloc__free(void *ptr)
  {
  	free(ptr);
  }
  
  int git_stdalloc_init_allocator(git_allocator *allocator)
  {
  	allocator->gmalloc = stdalloc__malloc;
  	allocator->gcalloc = stdalloc__calloc;
  	allocator->gstrdup = stdalloc__strdup;
  	allocator->gstrndup = stdalloc__strndup;
  	allocator->gsubstrdup = stdalloc__substrdup;
  	allocator->grealloc = stdalloc__realloc;
  	allocator->greallocarray = stdalloc__reallocarray;
  	allocator->gmallocarray = stdalloc__mallocarray;
  	allocator->gfree = stdalloc__free;
  	return 0;
  }
  

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