C++ FREE_AND_NULL函数代码示例

void grep_source_clear(struct grep_source *gs)
{
	FREE_AND_NULL(gs->name);
	FREE_AND_NULL(gs->path);
	FREE_AND_NULL(gs->identifier);
	grep_source_clear_data(gs);
}

int modem_close(void)
{
	time_t start;

	conn_api.terminate=1;

	if((comGetModemStatus(com)&COM_DCD)==0)	/* DCD already low */
		goto CLOSEIT;

	/* TODO:  We need a drain function */
	SLEEP(500);

	if(!comLowerDTR(com))
		goto CLOSEIT;

	start=time(NULL);
	while(time(NULL)-start <= 10) {
		if((comGetModemStatus(com)&COM_DCD) == 0)
			goto CLOSEIT;
		SLEEP(1000); 
	}

CLOSEIT:
	while(conn_api.input_thread_running || conn_api.output_thread_running)
		SLEEP(1);
	comClose(com);

	destroy_conn_buf(&conn_inbuf);
	destroy_conn_buf(&conn_outbuf);
	FREE_AND_NULL(conn_api.rd_buf);
	FREE_AND_NULL(conn_api.wr_buf);
	return(0);
}

void signature_check_clear(struct signature_check *sigc)
{
	FREE_AND_NULL(sigc->payload);
	FREE_AND_NULL(sigc->gpg_output);
	FREE_AND_NULL(sigc->gpg_status);
	FREE_AND_NULL(sigc->signer);
	FREE_AND_NULL(sigc->key);
}

void refspec_item_clear(struct refspec_item *item)
{
	FREE_AND_NULL(item->src);
	FREE_AND_NULL(item->dst);
	item->force = 0;
	item->pattern = 0;
	item->matching = 0;
	item->exact_sha1 = 0;
}

void repo_clear(struct repository *repo)
{
	FREE_AND_NULL(repo->gitdir);
	FREE_AND_NULL(repo->commondir);
	FREE_AND_NULL(repo->graft_file);
	FREE_AND_NULL(repo->index_file);
	FREE_AND_NULL(repo->worktree);
	FREE_AND_NULL(repo->submodule_prefix);

	raw_object_store_clear(repo->objects);
	FREE_AND_NULL(repo->objects);

	if (repo->config) {
		git_configset_clear(repo->config);
		FREE_AND_NULL(repo->config);
	}

	if (repo->submodule_cache) {
		submodule_cache_free(repo->submodule_cache);
		repo->submodule_cache = NULL;
	}

	if (repo->index) {
		discard_index(repo->index);
		FREE_AND_NULL(repo->index);
	}
}

void attr_check_clear(struct attr_check *check)
{
	FREE_AND_NULL(check->items);
	check->alloc = 0;
	check->nr = 0;

	FREE_AND_NULL(check->all_attrs);
	check->all_attrs_nr = 0;

	drop_attr_stack(&check->stack);
}

int serial_close(void)
{
	conn_api.terminate=1;

	while(conn_api.input_thread_running || conn_api.output_thread_running)
		SLEEP(1);
	comClose(com);
	destroy_conn_buf(&conn_inbuf);
	destroy_conn_buf(&conn_outbuf);
	FREE_AND_NULL(conn_api.rd_buf);
	FREE_AND_NULL(conn_api.wr_buf);
	return(0);
}

void credential_reject(struct credential *c)
{
	int i;

	credential_apply_config(c);

	for (i = 0; i < c->helpers.nr; i++)
		credential_do(c, c->helpers.items[i].string, "erase");

	FREE_AND_NULL(c->username);
	FREE_AND_NULL(c->password);
	c->approved = 0;
}

/*--------------------------------------------------------------------------- 
gamma.c (destroy_rules)
----------------------------------------------------------------------------*/
void destroy_rules( RULE_PARAM * r_p ) { 
   if ( r_p != NULL ) {
      DBG("destroy_rules 1");
      FREE_AND_NULL( r_p -> rule_space ) ;
      DBG("destroy_rules 2");
      FREE_AND_NULL( r_p -> key_space ) ;
      DBG("destroy_rules 3");
      PAGC_DESTROY_2D_ARRAY(r_p->output_link,KW*,r_p->num_nodes) ;
      DBG("destroy_rules 4");
      PAGC_DESTROY_2D_ARRAY(r_p->gamma_matrix,NODE,r_p->num_nodes) ;
      DBG(" destroy_rules 5");
      FREE_AND_NULL( r_p ) ;
   }

void raw_object_store_clear(struct raw_object_store *o)
{
	FREE_AND_NULL(o->objectdir);
	FREE_AND_NULL(o->alternate_db);

	oidmap_free(o->replace_map, 1);
	FREE_AND_NULL(o->replace_map);

	free_alt_odbs(o);
	o->alt_odb_tail = NULL;

	INIT_LIST_HEAD(&o->packed_git_mru);
	close_all_packs(o);
	o->packed_git = NULL;
}

static void fetch_symref(const char *path, char **symref, struct object_id *oid)
{
	char *url = xstrfmt("%s%s", repo->url, path);
	struct strbuf buffer = STRBUF_INIT;
	const char *name;

	if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
		die("Couldn't get %s for remote symref\n%s", url,
		    curl_errorstr);
	free(url);

	FREE_AND_NULL(*symref);
	oidclr(oid);

	if (buffer.len == 0)
		return;

	/* Cut off trailing newline. */
	strbuf_rtrim(&buffer);

	/* If it's a symref, set the refname; otherwise try for a sha1 */
	if (skip_prefix(buffer.buf, "ref: ", &name)) {
		*symref = xmemdupz(name, buffer.len - (name - buffer.buf));
	} else {
		get_oid_hex(buffer.buf, oid);
	}

	strbuf_release(&buffer);
}

static void
xml_start_tag(void *userData, const char *name, const char **atts)
{
	struct xml_ctx *ctx = (struct xml_ctx *)userData;
	const char *c = strchr(name, ':');
	int old_namelen, new_len;

	if (c == NULL)
		c = name;
	else
		c++;

	old_namelen = strlen(ctx->name);
	new_len = old_namelen + strlen(c) + 2;

	if (new_len > ctx->len) {
		ctx->name = xrealloc(ctx->name, new_len);
		ctx->len = new_len;
	}
	xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);

	FREE_AND_NULL(ctx->cdata);

	ctx->userFunc(ctx, 0);
}

static void
pylzma_decomp_dealloc(CDecompressionObject *self)
{
    LzmaDec_Free(&self->state, &allocator);
    FREE_AND_NULL(self->unconsumed_tail);
    self->ob_type->tp_free((PyObject*) self);
}

static int graph_verify(int argc, const char **argv)
{
	struct commit_graph *graph = NULL;
	char *graph_name;

	static struct option builtin_commit_graph_verify_options[] = {
		OPT_STRING(0, "object-dir", &opts.obj_dir,
			   N_("dir"),
			   N_("The object directory to store the graph")),
		OPT_END(),
	};

	argc = parse_options(argc, argv, NULL,
			     builtin_commit_graph_verify_options,
			     builtin_commit_graph_verify_usage, 0);

	if (!opts.obj_dir)
		opts.obj_dir = get_object_directory();

	graph_name = get_commit_graph_filename(opts.obj_dir);
	graph = load_commit_graph_one(graph_name);
	FREE_AND_NULL(graph_name);

	if (!graph)
		return 0;

	UNLEAK(graph);
	return verify_commit_graph(the_repository, graph);
}

/*
 * Make a new combine_diff_path from path/mode/sha1
 * and append it to paths list tail.
 *
 * Memory for created elements could be reused:
 *
 *	- if last->next == NULL, the memory is allocated;
 *
 *	- if last->next != NULL, it is assumed that p=last->next was returned
 *	  earlier by this function, and p->next was *not* modified.
 *	  The memory is then reused from p.
 *
 * so for clients,
 *
 * - if you do need to keep the element
 *
 *	p = path_appendnew(p, ...);
 *	process(p);
 *	p->next = NULL;
 *
 * - if you don't need to keep the element after processing
 *
 *	pprev = p;
 *	p = path_appendnew(p, ...);
 *	process(p);
 *	p = pprev;
 *	; don't forget to free tail->next in the end
 *
 * p->parent[] remains uninitialized.
 */
static struct combine_diff_path *path_appendnew(struct combine_diff_path *last,
	int nparent, const struct strbuf *base, const char *path, int pathlen,
	unsigned mode, const struct object_id *oid)
{
	struct combine_diff_path *p;
	size_t len = st_add(base->len, pathlen);
	size_t alloclen = combine_diff_path_size(nparent, len);

	/* if last->next is !NULL - it is a pre-allocated memory, we can reuse */
	p = last->next;
	if (p && (alloclen > (intptr_t)p->next)) {
		FREE_AND_NULL(p);
	}

	if (!p) {
		p = xmalloc(alloclen);

		/*
		 * until we go to it next round, .next holds how many bytes we
		 * allocated (for faster realloc - we don't need copying old data).
		 */
		p->next = (struct combine_diff_path *)(intptr_t)alloclen;
	}

	last->next = p;

	p->path = (char *)&(p->parent[nparent]);
	memcpy(p->path, base->buf, base->len);
	memcpy(p->path + base->len, path, pathlen);
	p->path[len] = 0;
	p->mode = mode;
	oidcpy(&p->oid, oid ? oid : &null_oid);

	return p;
}