thodg/libgit2/src/allocators/failalloc.c

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• Hash : 08f28ff5
  Author :
  Date : 2020-07-10T08:57:05
  

  alloc: set up an allocator that fails before library init
  
  We require the library to be initialized with git_libgit2_init before it
  is functional.  However, if a user tries to uses the library without
  doing so - as they might when getting started with the library for the
  first time - we will likely crash.
  
  This commit introduces some guard rails - now instead of having _no_
  allocator by default, we'll have an allocator that always fails, and
  never tries to set an error message (since the thread-local state is
  set up by git_libgit2_init).  We've modified the error retrieval
  function to (try to) ensure that the library has been initialized before
  getting the thread-local error message.
  
  (Unfortunately, we cannot determine if the thread local storage has
  actually been configured, this does require initialization by
  git_libgit2_init.  But a naive attempt should be good enough for most
  cases.)
  

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• src/allocators/failalloc.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 "failalloc.h"
  
  void *git_failalloc_malloc(size_t len, const char *file, int line)
  {
  	GIT_UNUSED(len);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  void *git_failalloc_calloc(size_t nelem, size_t elsize, const char *file, int line)
  {
  	GIT_UNUSED(nelem);
  	GIT_UNUSED(elsize);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  char *git_failalloc_strdup(const char *str, const char *file, int line)
  {
  	GIT_UNUSED(str);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  char *git_failalloc_strndup(const char *str, size_t n, const char *file, int line)
  {
  	GIT_UNUSED(str);
  	GIT_UNUSED(n);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  char *git_failalloc_substrdup(const char *start, size_t n, const char *file, int line)
  {
  	GIT_UNUSED(start);
  	GIT_UNUSED(n);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  void *git_failalloc_realloc(void *ptr, size_t size, const char *file, int line)
  {
  	GIT_UNUSED(ptr);
  	GIT_UNUSED(size);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  void *git_failalloc_reallocarray(void *ptr, size_t nelem, size_t elsize, const char *file, int line)
  {
  	GIT_UNUSED(ptr);
  	GIT_UNUSED(nelem);
  	GIT_UNUSED(elsize);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  void *git_failalloc_mallocarray(size_t nelem, size_t elsize, const char *file, int line)
  {
  	GIT_UNUSED(nelem);
  	GIT_UNUSED(elsize);
  	GIT_UNUSED(file);
  	GIT_UNUSED(line);
  
  	return NULL;
  }
  
  void git_failalloc_free(void *ptr)
  {
  	GIT_UNUSED(ptr);
  }
  

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