自学教程：C++ xml_free函数代码示例

/* * load environment variable */bool_t loadenv(char * file){	struct xml * root, * env;	root = xml_parse_file(file);	if(!root || !root->name)		return FALSE;	if(strcmp(root->name, "environment") != 0)	{		xml_free(root);		return FALSE;	}	clearenv();	for(env = xml_child(root, "env"); env; env = env->next)	{		if(env->txt)			putenv(env->txt);	}	xml_free(root);	return TRUE;}

xml_node *xml_parse( const char *filename ) {	int done = 0;	FILE *xptr;	XML_Parser p;	static char buf[BUFSIZE];	xml_node root, *ret;	if( (xptr = fopen( filename, "r" )) == NULL ) {		fprintf( stderr, "Unable to open file: %s/n", filename );		return NULL;	}	root.child = NULL;	if( (ret = xml_alloc(&root)) == NULL ) {		fclose( xptr );		fprintf( stderr, "Out of memory/n" );		return NULL;	}	if( (p = XML_ParserCreate( NULL )) == NULL ) {		fclose( xptr );		fprintf( stderr, "Out of memory/n" );		return NULL;	}	XML_SetUserData( p, &ret );	XML_SetElementHandler( p, xml_el_start, xml_el_end );	XML_SetCharacterDataHandler( p, xml_charhndl );	while( !done ) {		int len;		len = fread( buf, 1, BUFSIZE, xptr );		if( ferror( xptr ) ) {			fprintf( stderr, "Read error/n" );			xml_free( ret );			ret = NULL;			break;		}		done = feof( xptr );		if( XML_Parse(p, buf, len, done) == 0 ) {			fprintf( stderr, "Parse error at line %d:/n%s/n",							 (int) XML_GetCurrentLineNumber(p),							 XML_ErrorString( XML_GetErrorCode(p) ) );			xml_free( ret );			ret = NULL;			break;		}	}	if( ret != NULL )		ret->parent = NULL;	fclose( xptr );	XML_ParserFree( p );	return ret;}

/* free a previously allocated XmlNode */void xml_free(XmlNode *target){	int i;	for(i=0; i<target->nattrib*2; i++)		if(target->attrib[i])			free(target->attrib[i]);	if(target->attrib)free(target->attrib);	if(target->child)xml_free(target->child);	if(target->next)xml_free(target->next);	free(target->name);	free(target);}

/*! Create a new notification subscription * @param[in]   h        Clicon handle * @param{in]   stream   name of notificatio/log stream (CLICON is predefined) * @param{in]   filter   message filter, eg xpath for xml notifications * @param[out]  s0       socket returned where notification mesages will appear * @retval      0        OK * @retval      -1       Error and logged to syslog * @note When using netconf create-subsrciption,status and format is not supported */intclicon_rpc_create_subscription(clicon_handle    h,			       char            *stream, 			       char            *filter, 			       int             *s0){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><create-subscription xmlns=/"urn:ietf:params:xml:ns:netmod:notification/">"				 "<stream>%s</stream>"				 "<filter type=/"xpath/" select=/"%s/" />"				 "</create-subscription></rpc>", 				 username?username:"",				 stream?stream:"", filter?filter:"")) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, s0) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Create subscription", xerr);	goto done;    }    retval = 0;  done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

/*! Send a debug request to backend server * @param[in] h        CLICON handle * @param[in] level    Debug level * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_debug(clicon_handle h, 		int           level){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    /* XXX: hardcoded example yang, should be clixon-config!!! */    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><debug xmlns=/"http://clicon.org/lib/"><level>%d</level></debug></rpc>", username?username:"", level)) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Debug",xerr);	goto done;    }    if (xpath_first(xret, "//rpc-reply/ok") == NULL){	clicon_err(OE_XML, 0, "rpc error"); /* XXX extract info from rpc-error */	goto done;    }    retval = 0; done:    if (msg)	free(msg);    if (xret)	xml_free(xret);    return retval;}

/*! Commit changes send a commit request to backend daemon * @param[in] h          CLICON handle * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_commit(clicon_handle h){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><commit/></rpc>", username?username:"")) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error(CLIXON_ERRSTR_COMMIT_FAILED, xerr);	goto done;    }    retval = 0; done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

/*! Discard all changes in candidate / revert to running * @param[in] h        CLICON handle * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_discard_changes(clicon_handle h){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><discard-changes/></rpc>", username?username:"")) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Discard changes", xerr);	goto done;    }    retval = 0; done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

/*! Kill other user sessions * @param[in] h           CLICON handle * @param[in] session_id  Session id of other user session * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_kill_session(clicon_handle h,			int           session_id){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><kill-session><session-id>%d</session-id></kill-session></rpc>",				 username?username:"", session_id)) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Kill session", xerr);	goto done;    }    retval = 0; done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

/*! Send validate request to backend daemon * @param[in] h        CLICON handle * @param[in] db       Name of database * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_validate(clicon_handle h, 		    char         *db){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><validate><source><%s/></source></validate></rpc>", username?username:"", db)) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error(CLIXON_ERRSTR_VALIDATE_FAILED, xerr);	goto done;	    }    retval = 0; done:    if (msg)	free(msg);    if (xret)	xml_free(xret);    return retval;}

/*! Unlock a database * @param[in] h        CLICON handle * @param[in] db       database, eg "running" * @retval    0        OK * @retval   -1        Error and logged to syslog */intclicon_rpc_unlock(clicon_handle h, 		  char         *db){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><unlock><target><%s/></target></unlock></rpc>", username?username:"", db)) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Configuration unlock", xerr);	goto done;    }    retval = 0; done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

/*! Send a request to backend to delete a config database * @param[in] h        CLICON handle * @param[in] db       database, eg "running" * @retval    0        OK * @retval   -1        Error and logged to syslog * @code * if (clicon_rpc_delete_config(h, "startup") < 0) *    err; * @endcode */intclicon_rpc_delete_config(clicon_handle h, 			 char         *db){    int                retval = -1;    struct clicon_msg *msg = NULL;    cxobj             *xret = NULL;    cxobj             *xerr;    char              *username;    username = clicon_username_get(h);    if ((msg = clicon_msg_encode("<rpc username=/"%s/"><edit-config><target><%s/></target><default-operation>none</default-operation><config operation=/"delete/"/></edit-config></rpc>",				 username?username:"", db)) == NULL)	goto done;    if (clicon_rpc_msg(h, msg, &xret, NULL) < 0)	goto done;    if ((xerr = xpath_first(xret, "//rpc-error")) != NULL){	clicon_rpc_generate_error("Deleting configuration", xerr);	goto done;    }    retval = 0; done:    if (xret)	xml_free(xret);    if (msg)	free(msg);    return retval;}

MODULE free_switches_structure (void){    if (xml_switches)        xml_free (xml_switches);    xml_switches = NULL;}

void xml_el_start( void *data, const char *name, const char **attr ) {	int i, nattr = 1;	xml_node *node = xml_alloc( *((xml_node **) data) );	if( node == NULL ) {		fprintf( stderr, "Out of memory/n" );		return;	}	node->key = strdup( name );	for( i=0;attr[i];i++ )		nattr++;	if( (node->attr = (char **) malloc( sizeof( char * ) *nattr )) == NULL ) {		fprintf( stderr, "Out of memory/n" );		xml_free( node );		return;	}	for( i=0;attr[i];i++ ) {		node->attr[i] = strdup( attr[i] );		//printf("ATTR: %s/n", attr[i]);        }	node->attr[i] = NULL;			*((xml_node **) data) = node;}

char *test_read_input(){        FILE *f;        /* open, read and parse some invalid xml */        f = fopen("test.invalid.xml", "r");        mu_assert("read invalid xml", read_input(f) == 0);        fclose(f);        mu_assert("parse invalid xml", xml_parse(buf) == XML_STATUS_INVALID);        /* open, read and parse some valid xml */        f = fopen("test.xml", "r");        mu_assert("read valid xml", read_input(f) == 0);        fclose(f);        mu_assert("buffer contains request", strncmp(buf,"<request>", 9) == 0);        mu_assert("parse some valid xml", xml_parse(buf) == XML_STATUS_OK);        /* fetch value of an element */        char *value = xml_element("//username");        mu_assert("perform xpath search for element", value != NULL);        mu_assert("get value of xml element", strcmp(value, "iamauser") == 0);        xml_free(value);        xml_cleanup();        return 0;}

voidprepare_xml_file (char *filename){    int    rc;    rc = xml_load_file (& xml_root, PATH, filename, FALSE);    if (rc == XML_NOERROR)    {        xml_source = xml_first_child (xml_root);        if (xml_source)        {            xml_put_attr (xml_switches, "filename", filename);            xml_put_attr (xml_switches, "template", "1");        }        else            xml_free (xml_root);    }    else    {        coprintf ("%s E: Error processing %s...", me, filename);        coprintf (xml_error ());        raise_exception (anomaly_event);    }}

/*! Merge xml in filename into database * @retval   -1       Error * @retval    0       Validation failed (with cbret set) * @retval    1       Validation OK        */static intload_extraxml(clicon_handle h,	      char         *filename,	      const char   *db,	      cbuf         *cbret){    int    retval =  -1;    cxobj *xt = NULL;    int    fd = -1;    if (filename == NULL)	return 1;    if ((fd = open(filename, O_RDONLY)) < 0){	clicon_err(OE_UNIX, errno, "open(%s)", filename);	goto done;    }    if (xml_parse_file(fd, "</config>", NULL, &xt) < 0)	goto done;    /* Replace parent w first child */    if (xml_rootchild(xt, 0, &xt) < 0)	goto done;    /* Merge user reset state */    retval = xmldb_put(h, (char*)db, OP_MERGE, xt, clicon_username_get(h), cbret); done:    if (fd != -1)	close(fd);    if (xt)	xml_free(xt);    return retval;}

/* bootstrap the structures for xml_parse() to be able to get started */XmlNode* xml_load(const char * filename){	struct XMLBUF xml;	XmlNode *ret = NULL;//	printf("xml_load(/"%s/");/n", filename);	xml.error = 0;	xml.eof = 0;	xml.read_index = 0;	xml.fptr = fopen(filename, "rb");	if(!xml.fptr)		return NULL;	xml.buf = malloc(BUFFER+1);	if(!xml.buf)		goto xml_load_fail_malloc_buf;	xml.buf[BUFFER]=0;	xml.len = BUFFER;		xml_read_file(&xml);	ret = xml_parse(&xml);	if(xml.error)	{		xml_free(ret);		ret = NULL;	}	free(xml.buf);xml_load_fail_malloc_buf:	fclose(xml.fptr);	return ret;}

static oss_post_object_group_result_t *construct_post_object_group_response(curl_request_param_t *user_data){	const char *response = user_data->recv_buffer->ptr;	assert(response != NULL);	XmlNode *xml, *bucket_tag, *key_tag, *etag_tag, *size_tag;	unsigned int response_len = strlen(response); 	xml = xml_load_buffer(response, response_len);	oss_post_object_group_result_t *result = post_object_group_result_initialize();	bucket_tag = xml_find(xml, "Bucket");	result->set_bucket_name(result, *bucket_tag->child->attrib);	key_tag = xml_find(xml, "Key");	result->set_key(result, *key_tag->child->attrib); 	etag_tag = xml_find(xml, "ETag");	result->set_etag(result, *etag_tag->child->attrib);	size_tag = xml_find(xml,"Size");	unsigned int size = (unsigned int)atoi(*size_tag->child->attrib);	result->set_size(result, size); 	oss_free_user_data(user_data); 	xml_free(xml);	return result;	}

unsigned shortoss_get_retcode_from_response(const char *response){	unsigned short ret;	assert(response != NULL);	if (strlen(response) == 0) return NETWORK_NOT_AVAILABLE;	XmlNode *xml, *code_tag;	char *retinfo;	unsigned int response_len = strlen(response); 	xml = xml_load_buffer(response, response_len);	if (NULL == xml)	{		return OSSCLIB_INTERNAL_ERROR;	}	code_tag = xml_find(xml, "Code");	if (code_tag != NULL) {		retinfo = *code_tag->child->attrib;		ret = oss_get_retcode_from_retinfo(retinfo);	}	else {		ret = NGINX_NOT_AVAILABLE;	}		xml_free(xml);	return ret;}

/* we add another function: *        XmlNode *xml_load_buffer(const char *buffer) to fit our need. */XmlNode* xml_load_buffer(const char * buffer, unsigned int buffer_len){	struct XMLBUF xml;	XmlNode *ret = NULL;	xml.error = 0;	xml.eof = 1;	xml.read_index = 0;	xml.fptr = NULL;	xml.buf = (char *)malloc(sizeof(char) * buffer_len + 1);	if(!xml.buf)		goto xml_load_fail_malloc_buf;	memset(xml.buf, 0, buffer_len + 1);	xml.len = buffer_len;	memcpy(xml.buf, buffer, buffer_len);	ret = xml_parse(&xml);	if(xml.error)	{		xml_free(ret);		ret = NULL;	}	free(xml.buf);xml_load_fail_malloc_buf:	return ret;}

static oss_access_control_list_t *construct_get_bucket_acl_response(    curl_request_param_t *user_data){    const char *response = user_data->recv_buffer->ptr;    assert(response != NULL);    XmlNode *xml, *grant_tag, *owner_tag;    unsigned int response_len = strlen(response);    xml = xml_load_buffer(response, response_len);    owner_tag = xml_find(xml, "Owner");    oss_owner_t *owner = owner_initialize_with_id(*owner_tag->child->child->attrib,                         *owner_tag->child->next->child->attrib);    grant_tag = xml_find(xml, "Grant");    oss_access_control_list_t *acl = access_control_list_initialize();    acl->set_grant(acl, *grant_tag->child->attrib);    acl->set_owner(acl, owner);    oss_free_user_data(user_data);    xml_free(xml);    return acl;}

Bool load_config (const char *filename){    int rc;    XML_ITEM *config = NULL;    XML_ITEM *root   = NULL;    char fullname[FILE_NAME_MAX + 1];    root = xml_create ("root", NULL);    ASSERT (filename != NULL);    ASSERT (strlen(filename) < FILE_NAME_MAX);    default_extension (fullname, filename, "cfg");    rc = xml_load_file (&root, ".", fullname, FALSE);    if (rc != XML_NOERROR)      {        coprintf ("Error while loading /"%s/". Check file presence and consistence",                   fullname);        display_usage ();        return FALSE;;      }    config = xml_first_child (root);    ASSERT (config);    /* default server is localhost */    main_server =   mem_strdup (xml_get_attr (config, "smtp",    "127.0.0.1"));    main_sender =   mem_strdup (xml_get_attr (config, "sender",  "[email
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