thodg/libgit2/src/refdb.c

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• Hash : f658dc43
  Author :
  Date : 2013-05-31T14:09:58
  

  Zero memory for major objects before freeing By zeroing out the memory when we free larger objects (i.e. those that serve as collections of other data, such as repos, odb, refdb), I'm hoping that it will be easier for libgit2 bindings to find errors in their object management code.

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• src/refdb.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 "common.h"
  #include "posix.h"
  
  #include "git2/object.h"
  #include "git2/refs.h"
  #include "git2/refdb.h"
  #include "git2/sys/refdb_backend.h"
  
  #include "hash.h"
  #include "refdb.h"
  #include "refs.h"
  
  int git_refdb_new(git_refdb **out, git_repository *repo)
  {
  	git_refdb *db;
  
  	assert(out && repo);
  
  	db = git__calloc(1, sizeof(*db));
  	GITERR_CHECK_ALLOC(db);
  
  	db->repo = repo;
  
  	*out = db;
  	GIT_REFCOUNT_INC(db);
  	return 0;
  }
  
  int git_refdb_open(git_refdb **out, git_repository *repo)
  {
  	git_refdb *db;
  	git_refdb_backend *dir;
  
  	assert(out && repo);
  
  	*out = NULL;
  
  	if (git_refdb_new(&db, repo) < 0)
  		return -1;
  
  	/* Add the default (filesystem) backend */
  	if (git_refdb_backend_fs(&dir, repo) < 0) {
  		git_refdb_free(db);
  		return -1;
  	}
  
  	db->repo = repo;
  	db->backend = dir;
  
  	*out = db;
  	return 0;
  }
  
  static void refdb_free_backend(git_refdb *db)
  {
  	if (db->backend) {
  		if (db->backend->free)
  			db->backend->free(db->backend);
  		else
  			git__free(db->backend);
  	}
  }
  
  int git_refdb_set_backend(git_refdb *db, git_refdb_backend *backend)
  {
  	refdb_free_backend(db);
  	db->backend = backend;
  
  	return 0;
  }
  
  int git_refdb_compress(git_refdb *db)
  {
  	assert(db);
  
  	if (db->backend->compress)
  		return db->backend->compress(db->backend);
  
  	return 0;
  }
  
  static void refdb_free(git_refdb *db)
  {
  	refdb_free_backend(db);
  	memset(db, 0, sizeof(*db));
  	git__free(db);
  }
  
  void git_refdb_free(git_refdb *db)
  {
  	if (db == NULL)
  		return;
  
  	GIT_REFCOUNT_DEC(db, refdb_free);
  }
  
  int git_refdb_exists(int *exists, git_refdb *refdb, const char *ref_name)
  {
  	assert(exists && refdb && refdb->backend);
  
  	return refdb->backend->exists(exists, refdb->backend, ref_name);
  }
  
  int git_refdb_lookup(git_reference **out, git_refdb *db, const char *ref_name)
  {
  	git_reference *ref;
  	int error;
  
  	assert(db && db->backend && out && ref_name);
  
  	if (!(error = db->backend->lookup(&ref, db->backend, ref_name))) {
  		ref->db = db;
  		*out = ref;
  	} else {
  		*out = NULL;
  	}
  
  	return error;
  }
  
  int git_refdb_iterator(git_reference_iterator **out, git_refdb *db)
  {
  	if (!db->backend || !db->backend->iterator) {
  		giterr_set(GITERR_REFERENCE, "This backend doesn't support iterators");
  		return -1;
  	}
  
  	if (db->backend->iterator(out, db->backend) < 0)
  		return -1;
  
  	return 0;
  }
  
  int git_refdb_iterator_glob(git_reference_iterator **out, git_refdb *db, const char *glob)
  {
  	if (!db->backend) {
  		giterr_set(GITERR_REFERENCE, "There are no backends loaded");
  		return -1;
  	}
  
  	if (db->backend->iterator_glob)
  		return db->backend->iterator_glob(out, db->backend, glob);
  
  	/* If the backend doesn't support glob-filtering themselves, we have to do it */
  	if (db->backend->iterator(out, db->backend) < 0)
  		return -1;
  
  	(*out)->glob = git__strdup(glob);
  	if (!(*out)->glob) {
  		db->backend->iterator_free(*out);
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_refdb_next(const char **out, git_reference_iterator *iter)
  {
  	int error;
  
  	if (!iter->glob)
  		return iter->backend->next(out, iter);
  
  	/* If the iterator has a glob, we need to filter */
  	while ((error = iter->backend->next(out, iter)) == 0) {
  		if (!p_fnmatch(iter->glob, *out, 0))
  			break;
  	}
  
  	return error;
  }
  
  void git_refdb_iterator_free(git_reference_iterator *iter)
  {
  	git__free(iter->glob);
  	iter->backend->iterator_free(iter);
  }
  
  struct glob_cb_data {
  	const char *glob;
  	git_reference_foreach_cb callback;
  	void *payload;
  };
  
  int git_refdb_write(git_refdb *db, const git_reference *ref)
  {
  	assert(db && db->backend);
  
  	return db->backend->write(db->backend, ref);
  }
  
  int git_refdb_delete(struct git_refdb *db, const git_reference *ref)
  {
  	assert(db && db->backend);
  
  	return db->backend->delete(db->backend, ref);
  }
  

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