自学教程：C++ user_path函数代码示例

int main(object me, string arg){	string msg, loc;	object ridee;	if( file_size(user_path(geteuid(me)) + "workroom.c") <= 0 )		return notify_fail("你没有自己的工作室。/n");	if( stringp(msg = me->query("env/msg_home")) )		if (msg != "") message_vision(msg + "/n", me);	loc = user_path(geteuid(me)) + "workroom";	if (ridee = me->ride())		ridee->move(loc);	me->move(loc);		return 1;}

int cmd_sponsor(string str) {    object who;    if(!str) {	notify_fail("Sponsor whom?/n");	return 0;    }    who = find_living(str);    if(!who) {	notify_fail("No "+capitalize(str)+" on the mud./n");	return 0;    }    if((string)who->query_position() != "new immortal") {	notify_fail(capitalize(str)+" is still a mortal!/n");	return 0;    }    if(!archp(this_player()) && (string)this_player()->query_position() != "mentor") {	notify_fail("You are not allowed to sponsor anyone!/n");	return 0;    }    who->set_level(1);    seteuid(UID_ADVANCE);    who->set_position("immortal");    seteuid(UID_ARCHSAVE);    write_file("/adm/etc/sponsor", str+" ("+(string)this_player()->query_name()+	":"+ctime(time())+")/n");    seteuid(getuid());    message("info", sprintf("You are now a full immortal!/nYour home "      "directory is %s.", user_path(str)), who);    message("info", sprintf("%s is now a full immortal!", capitalize(str)),      users(), ({ who }));

mixed cmd(string args) {    object player = this_player();    mixed replee = player->GetProperty("reply");    string ret = "";    string *tmp;    ret += "Screen: /t/t"+identify(this_player()->GetScreen())+"/n";    ret += "Terminal: /t/t"+this_player()->GetTerminal()+"/n";    ret += "Brief mode: /t/t"+ ( (this_player()->GetBriefMode()) ? "on" : "off" )+"/n";    ret += "Cursefilter: /t/t"+ ( (this_player()->GetParanoia("cursefilter")) ? "on" : "off" )+"/n";    ret += "Channel message colors: "+ ( (this_player()->GetNoChanColors()) ? "off" : "on" )+"/n";    ret += "Playerkiller mode: /t"+ ( (this_player()->GetPK()) ? "on" : "off" )+"/n";    ret += "Mute mode: /t/t"+ GetMuted()+" /n";    ret += "Gag mode: /t/t"+ GetGagged()+" /n";    ret += "Wimpy mode: /t/t"+ ( (this_player()->GetWimpy()) ? "on" : "off" )+"/n";#if efun_defined(compressedp)    ret += "MCCP mode: /t/t"+(compressedp(this_player()) ? "on" : "off")+"/n";#endif#if MINIMAP    ret += "Minimap mode: /t/t"+ ( this_player()->GetProperty("minimapping") ? "on" : "off" )+"/n";#endif    ret += "Annoyblock: /t/t"+ ( (this_player()->GetAnnoyblock()) ? "on" : "off" )+"/n";    ret += "Reprompt mode: /t/t"+ ( this_player()->GetProperty("reprompt") ? "on" : "off" )+"/n";    ret += "Screenlock mode: /t"+ ( this_player()->GetProperty("screenlock") ? "on" : "off" )+"/n";    ret += "Timezone: /t/t"+ ( this_player()->GetProperty("timezone") ?             this_player()->GetProperty("timezone") : "None specified" )+"/n";#ifdef __GET_CHAR_IS_BUFFERED__    ret += "Charmode: /t/t"+         //( (query_charmode(player) > 0) ? "on" : "off" )+"/n";        ( (player->GetCharmode()) ? "on" : "off" )+"/n";#endif    ret += "Commandecho: /t/t"+ ( this_player()->GetProperty("commandecho") ? this_player()->GetProperty("commandecho") : "off" )+"/n";#ifdef __DSLIB__    ret += "Keepalive mode: /t"+ ( this_player()->GetProperty("keepalive")             ? this_player()->GetProperty("keepalive") : "off" )+"/n";#endif    if(creatorp(this_player())){         ret += "Homedir: /t/t"+user_path(this_player())+"/n";        if(this_player()->GetParanoia("homeroom")){            ret += "Homeroom: /t/t"+this_player()->GetParanoia("homeroom")+"/n";        }        ret += "Debug mode: /t/t"+ ( (this_player()->GetProperty("debug")) ? "on" : "off" )+"/n";        ret += "Godmode: /t/t"+ ( (this_player()->GetGodMode()) ? "on" : "off" )+"/n";        ret += "Wizvision: /t/t"+ ( (this_player()->GetWizVision()) ? "on" : "off" )+"/n";#if GRID        ret += "Showgrid: /t/t"+ ( (this_player()->GetVisibleGrid()) ? "on" : "off" )+"/n";        ret += "Wizmap mode: /t/t"+ ( this_player()->GetProperty("wizmapping") ? "on" : "off" )+"/n";        ret += "Noclip mode: /t/t"+ ( this_player()->GetProperty("noclip") ? "on" : "off" )+"/n";        ret += "Anchor: /t/t"+ ( this_player()->GetAnchored() ? "on" : "off" )+"/n";#endif    }    if(replee){        ret += "Reply target: /t/t"+replee+"/n";    }    tmp = sort_array(explode(ret, "/n"),1);    ret = implode(tmp, "/n");    write(ret);    return 1;}

static long do_sys_truncate(const char __user *pathname, loff_t length){	struct path path;	struct inode *inode;	int error;	error = -EINVAL;	if (length < 0)			goto out;	error = user_path(pathname, &path);	if (error)		goto out;	inode = path.dentry->d_inode;		error = -EISDIR;	if (S_ISDIR(inode->i_mode))		goto dput_and_out;	error = -EINVAL;	if (!S_ISREG(inode->i_mode))		goto dput_and_out;	error = mnt_want_write(path.mnt);	if (error)		goto dput_and_out;	error = inode_permission(inode, MAY_WRITE);	if (error)		goto mnt_drop_write_and_out;	error = -EPERM;	if (IS_APPEND(inode))		goto mnt_drop_write_and_out;	error = get_write_access(inode);	if (error)		goto mnt_drop_write_and_out;	error = break_lease(inode, O_WRONLY);	if (error)		goto put_write_and_out;	error = locks_verify_truncate(inode, NULL, length);	if (!error)		error = security_path_truncate(&path);	if (!error)		error = do_truncate(path.dentry, length, 0, NULL);put_write_and_out:	put_write_access(inode);mnt_drop_write_and_out:	mnt_drop_write(path.mnt);dput_and_out:	path_put(&path);out:	return error;}

mixed GoHome(string str) {    object ob, prev;    string who, room;    prev = environment(this_player());    if( !str || str == "" || !creatorp(this_player())){        who = this_player()->GetKeyName();    }    else who = lower_case(str);    if(!user_exists(who)) return "There's no such user.";    room = PLAYERS_D->GetHomeRoom(who);    if(!room || !strsrch(room, "/tmp/")){        str = user_path(who, 1);        if(!directory_exists(str)) return "That person has no home dir.";        str = user_path(who, 1)+"workroom.c";        arg = str;        if(!unguarded((: file_exists(arg) :)))            return capitalize(who)+" has no active workroom.";    }

SYSCALL_DEFINE4(getxattr, const char __user *, pathname,		const char __user *, name, void __user *, value, size_t, size){	struct path path;	ssize_t error;	error = user_path(pathname, &path);	if (error)		return error;	error = getxattr(path.dentry, name, value, size);	path_put(&path);	return error;}

SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,		size_t, size){	struct path path;	ssize_t error;	error = user_path(pathname, &path);	if (error)		return error;	error = listxattr(path.dentry, list, size);	path_put(&path);	return error;}

int main(object me, string arg){	string dir;	if( !arg )		arg = user_path(me->query("id"));	dir = resolve_path(me->query("cwd"), arg);	if(file_size(dir)!=-2) return notify_fail("没有这个目录。/n");	if(dir[strlen(dir)-1]!='/') dir += "/";	me->set("cwd", dir);	write(dir + "/n");	return 1;	}

asmlinkage long sys_statfs(const char __user *pathname, struct statfs __user * buf){	struct path path;	int error;	error = user_path(pathname, &path);	if (!error) {		struct statfs tmp;		error = vfs_statfs_native(path.dentry, &tmp);		if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))			error = -EFAULT;		path_put(&path);	}	return error;}

static long do_sys_truncate(const char __user *pathname, loff_t length){	struct path path;	int error;	if (length < 0)	/* sorry, but loff_t says... */		return -EINVAL;	error = user_path(pathname, &path);	if (!error) {		error = vfs_truncate(&path, length);		path_put(&path);	}	return error;}

SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf){	struct path path;	int error;	error = user_path(pathname, &path);	if (!error) {		struct statfs tmp;		error = vfs_statfs_native(path.dentry, &tmp);		if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))			error = -EFAULT;		path_put(&path);	}	return error;}

SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf){	struct path path;	long error;	if (sz != sizeof(*buf))		return -EINVAL;	error = user_path(pathname, &path);	if (!error) {		struct statfs64 tmp;		error = vfs_statfs64(path.dentry, &tmp);		if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))			error = -EFAULT;		path_put(&path);	}	return error;}

SYSCALL_DEFINE2(removexattr, const char __user *, pathname,		const char __user *, name){	struct path path;	int error;	error = user_path(pathname, &path);	if (error)		return error;	error = mnt_want_write(path.mnt);	if (!error) {		error = removexattr(path.dentry, name);		mnt_drop_write(path.mnt);	}	path_put(&path);	return error;}

asmlinkage long sys_statfs64(const char __user *pathname, size_t sz, struct statfs64 __user *buf){	struct path path;	long error;	if (sz != sizeof(*buf))		return -EINVAL;	error = user_path(pathname, &path);	if (!error) {		struct statfs64 tmp;		error = vfs_statfs64(path.dentry, &tmp);		if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))			error = -EFAULT;		path_put(&path);	}	return error;}

SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group){	struct path path;	int error;	error = user_path(filename, &path);	if (error)		goto out;	error = mnt_want_write(path.mnt);	if (error)		goto out_release;	error = chown_common(&path, user, group);	mnt_drop_write(path.mnt);out_release:	path_put(&path);out:	return error;}

SYSCALL_DEFINE5(setxattr, const char __user *, pathname,		const char __user *, name, const void __user *, value,		size_t, size, int, flags){	struct path path;	int error;	error = user_path(pathname, &path);	if (error)		return error;	error = mnt_want_write(path.mnt);	if (!error) {		error = setxattr(path.dentry, name, value, size, flags);		mnt_drop_write(path.mnt);	}	path_put(&path);	return error;}

asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group){	struct path path;	int error;	error = user_path(filename, &path);	if (error)		goto out;	error = mnt_want_write(path.mnt);	if (error)		goto out_release;	error = chown_common(path.dentry, user, group);	mnt_drop_write(path.mnt);out_release:	path_put(&path);out:	return error;}

static int coda_pioctl(struct inode * inode, struct file * filp,                        unsigned int cmd, unsigned long user_data){	struct path path;        int error;	struct PioctlData data;        struct inode *target_inode = NULL;        struct coda_inode_info *cnp;        /* get the Pioctl data arguments from user space */        if (copy_from_user(&data, (void __user *)user_data, sizeof(data))) {	    return -EINVAL;	}               /*          * Look up the pathname. Note that the pathname is in          * user memory, and namei takes care of this         */        if (data.follow) {                error = user_path(data.path, &path);	} else {	        error = user_lpath(data.path, &path);	}			if ( error ) {		return error;        } else {		target_inode = path.dentry->d_inode;	}		/* return if it is not a Coda inode */	if ( target_inode->i_sb != inode->i_sb ) {		path_put(&path);	        return  -EINVAL;	}	/* now proceed to make the upcall */        cnp = ITOC(target_inode);	error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);	path_put(&path);        return error;}

SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group){	struct path path;	int error;	error = user_path(filename, &path);	if (error)		goto out;//ASUS_BSP +++ Jimmy,Josh "remove fuse"	if(strcmp(path.mnt->mnt_mountpoint->d_iname,"sdcard")==0){		error = -ENOSYS;		goto out_release;	}//ASUS_BSP --- Jimmy,Josh "remove fuse"	error = mnt_want_write(path.mnt);	if (error)		goto out_release;	error = chown_common(&path, user, group);	mnt_drop_write(path.mnt);out_release:	path_put(&path);out:	return error;}

static long do_sys_truncate(const char __user *pathname, loff_t length){	struct path path;	struct inode *inode;	int error;	error = -EINVAL;	if (length < 0)	/* sorry, but loff_t says... */		goto out;	error = user_path(pathname, &path);	if (error)		goto out;	inode = path.dentry->d_inode;	/* For directories it's -EISDIR, for other non-regulars - -EINVAL */	error = -EISDIR;	if (S_ISDIR(inode->i_mode))		goto dput_and_out;	error = -EINVAL;	if (!S_ISREG(inode->i_mode))		goto dput_and_out;	error = mnt_want_write(path.mnt);	if (error)		goto dput_and_out;	error = inode_permission(inode, MAY_WRITE);	if (error)		goto mnt_drop_write_and_out;	error = -EPERM;	if (IS_APPEND(inode))		goto mnt_drop_write_and_out;	error = get_write_access(inode);	if (error)		goto mnt_drop_write_and_out;	/*	 * Make sure that there are no leases.  get_write_access() protects	 * against the truncate racing with a lease-granting setlease().	 */	error = break_lease(inode, O_WRONLY);	if (error)		goto put_write_and_out;	error = locks_verify_truncate(inode, NULL, length);	if (!error)		error = security_path_truncate(&path);	if (!error)		error = do_truncate(path.dentry, length, 0, NULL);put_write_and_out:	put_write_access(inode);mnt_drop_write_and_out:	mnt_drop_write(path.mnt);dput_and_out:	path_put(&path);out:	return error;}

string datafile(){    return user_path( geteuid( this_object() ) ) + ".memo";}

int cmd_update(string str){    object	ob;    string	file, res, temp, *obs, logf;    int		i, deep_up, syslog_siz, mylog_siz;    if (!str)	str = (string)this_player()->query("cwf");    if (!str) {        notify_fail("You have no current working file set./n");        return 0;    }  if ( (strsrch(str,"/std/user#") != -1 ) || ( strsrch(str,     "/std/connection#") != -1 ) )  {    write("Updating a user or connection object isn't allowed!/n");    return 1;  }    if (str)		// update the specified file    {	if(sscanf(str, "-r %s", temp))	{	    file = temp;	    deep_up = 1;	}	else if(sscanf(str, "-R %s", temp))	{	    file = temp;	    deep_up = 2;	}	else if(str == "-r")	{	    file = 0;	    deep_up = 1;	}	else if(str == "-R")	{	    file = 0;	    deep_up = 2;	}	else	     file = str;    } // if(str)    if(!file)    {	if(!environment(this_player()))	{	    notify_fail("Update: You don't have an environment./n");	    return 0;	}	file = file_name(environment(this_player()));    }    else 	file = resolv_path("cwd", file);     //	Make sure that a ".c" is appended on the filename    if(extract(file, strlen(file)-2, strlen(file)-1) != ".c")	file += ".c";     this_player()->set("cwf",file);    logf = (string) this_player()->query("name");    logf=user_path(logf) + "log";	// assume if can use update, has a name    mylog_siz = file_size(logf);    syslog_siz = file_size(LOG_DIR + "log");    seteuid(geteuid(previous_object()));/* Beek 091993 - doesn't dest virtual objects now */    if (find_object(file) && virtualp(find_object(file))) {      notify_fail("That object is virtual and cannot be updated./n");      return 0;    }    if(!file_exists(file)) {	if(find_object(file)) {	destruct(find_object(file));	notify_fail("Update: " + file + " does not exist./n/tLoaded " +		    "copy of file removed from memory./n"); }    	else notify_fail("Update: " + file + " does not exist./n");    return 0; }    ob = find_object(file);    if (!ob)    {	res = catch(file->apply_load());	if(res)	{	    display_errs(mylog_siz, logf);	    display_errs(syslog_siz, LOG_DIR + "log");	    notify_fail("Failure to load object./n");	    return 0;	}	ob = find_object(file);    }

//.........这里部分代码省略.........	tmp1 = "[Private]";    if (adminp(TP) ||       body->query("name")==TP->query("name")) {	tmp1 = (string)link->query("email")+" "+tmp1;    } else {	if (body->query("email_visible")) {	    tmp1 = (string)link->query("email");	} else {	    tmp1 = "[Private]";	}    }    if (tmp1) msg += "Email address: " + tmp1 + "/n";    tmp1 = (string)link->query("URL");    if (tmp1) msg += "URL: " + tmp1 + "/n";    hibernate = (int)link->query("hibernate");    if (hibernate && time() < hibernate)	msg += "/n/t[In hibernation until " + ctime(hibernate) + "]/n/n";    tmp1 = find_player(who);    if (tmp1) {	if (!filter_users(tmp1))	    tmp1 = 0;    }    if (!link->query("last_on"))	msg += (tmp1 ? "On since: " : "Last on: ") + "Unavailable";    else	msg += ((tmp1 && !tmp1->query("npc")) ? "On since: " : "Last on: ") +	ctime((int)link->query("last_on")) ;    if (wizardp(TP)) 	msg += ( " from " + (string)link->query("ip") + " /n" );    else	msg += "/n";    if (tmp1) {	tmp1 = query_idle_string(tmp1, 1);	if (strlen(tmp1) > 0)	    msg += tmp1 + "/n";    }    mail_stat = (mapping)MAILBOX_D->mail_status(who);    if (mail_stat["unread"])	msg += sprintf("%s has not read %d of their %d piece%s of mail./n",	  capitalize(who), mail_stat["unread"], mail_stat["total"],	  (mail_stat["total"] == 1 ? "" : "s"));    else {	msg += "No unread mail" ;	if(this_player()) {	    if (adminp(getuid(this_player()))) {		//  msg += " ("+mail_stat["total"]+" pieces)" ;		msg += sprintf(" (%d piece%s)", mail_stat["total"], (mail_stat["total"] == 1 ? "" : "s"));	    }	}	msg += "./n" ;    }    if (link->query("wizard")) {	tmp1 = user_path(who) + ".project";	if (file_size(tmp1) >= 0)	    msg += "Project: " + read_file(tmp1);	tmp1 = user_path(who) + ".plan";	if (file_size(tmp1) >= 0) {	    msg += "Plan:/n" + read_file(tmp1);	} else {	    msg += "No Plan./n";	}    } else {	if (body->query("session"))	    tmp1 = iwrap("Session: "+body->query("session"));	else	    tmp1 = "No Session./n";	msg += tmp1;    }    msg += LINE1;    if (!find_player(who) || !interactive(find_player(who))) {	link->remove();	// Some names like .foo weren't getting away.	if(link) destruct(link);	if(link) log_file("fingerdest",sprintf("Connection of %s not "+		"dested by finger daemon, on %s./n", link->query("name"), 		ctime(time())));	if(body) destruct(body);	if(body) log_file("fingerdest",sprintf("Connection of %s not "+		"dested by finger daemon, on %s./n", body->query("name"), 		ctime(time())));    }    return "/n" + msg + "/n";}

	return 0;    }    if(!archp(this_player()) && (string)this_player()->query_position() != "mentor") {	notify_fail("You are not allowed to sponsor anyone!/n");	return 0;    }    who->set_level(1);    seteuid(UID_ADVANCE);    who->set_position("immortal");    seteuid(UID_ARCHSAVE);    write_file("/adm/etc/sponsor", str+" ("+(string)this_player()->query_name()+	":"+ctime(time())+")/n");    seteuid(getuid());    message("info", sprintf("You are now a full immortal!/nYour home "      "directory is %s.", user_path(str)), who);    message("info", sprintf("%s is now a full immortal!", capitalize(str)),      users(), ({ who }));    seteuid(UID_CRESAVE);    mkdir("/wizards/"+lower_case(str));    write_file(user_path(str)+"workroom.c", read_file("/std/obj/workroom.c"));    seteuid(getuid());    return 1;}void help() {    write("Syntax: <sponsor [player]>/n/n"+	"Mentors and above may use this command to sponsor new immortals/n"+	"from level 20 immortality to level 21, and it makes the directory/n"+	"as well./n");}