/**
* \file attrib.c
*
* \brief Manipulate attributes on objects.
*
*
*/
#include "copyrite.h"
#include "config.h"
#include <string.h>
#include <ctype.h>
#include "conf.h"
#include "externs.h"
#include "chunk.h"
#include "attrib.h"
#include "dbdefs.h"
#include "match.h"
#include "parse.h"
#include "htab.h"
#include "privtab.h"
#include "mymalloc.h"
#include "strtree.h"
#include "flags.h"
#include "mushdb.h"
#include "lock.h"
#include "log.h"
#include "confmagic.h"
#ifdef WIN32
#pragma warning( disable : 4761) /* disable warning re conversion */
#endif
/** A string tree of attribute names in use, to save us memory since
* many are duplicated.
*/
StrTree atr_names;
/** Table of attribute flags. */
extern PRIV attr_privs[];
/** A flag to show if we're in the middle of a @wipe (this changes
* behaviour for atr_clr()). Yes, this is gross and ugly, but it
* seemed like a better idea than propogating signature changes
* for atr_clr() and do_set_atr() through the entire codebase. If
* you come up with a better way, PLEASE fix this...
*/
int we_are_wiping;
/** A string to hold the name of a missing prefix branch, set by
* can_write_attr_internal. Again, gross and ugly. Please fix.
*/
static char missing_name[ATTRIBUTE_NAME_LIMIT + 1];
/*======================================================================*/
/** How many attributes go in a "page" of attribute memory? */
#define ATTRS_PER_PAGE (200)
/** A page of memory for attributes.
* This structure is a collection of attribute memory. Rather than
* allocate new attributes one at a time, we allocate them in pages,
* and build a linked free list from the allocated page.
*/
typedef struct atrpage {
ATTR atrs[ATTRS_PER_PAGE]; /**< Array of attribute structures */
} ATTRPAGE;
static ATTR *atr_free_list;
static ATTR *get_atr_free_list(void);
static ATTR *find_atr_pos_in_list(ATTR ***pos, char const *name);
static int can_create_attr(dbref player, dbref obj, char const *atr_name,
int flags);
static ATTR *find_atr_in_list(ATTR *atr, char const *name);
static ATTR *atr_get_with_parent(dbref obj, char const *atrname, dbref *parent);
/*======================================================================*/
/** Initialize the attribute string tree.
*/
void
init_atr_name_tree(void)
{
st_init(&atr_names);
}
/** Lookup table for good_atr_name */
extern char atr_name_table[UCHAR_MAX + 1];
/** Decide if a name is valid for an attribute.
* A good attribute name is at least one character long, no more than
* ATTRIBUTE_NAME_LIMIT characters long, and every character is a
* valid character. An attribute name may not start or end with a backtick.
* An attribute name may not contain multiple consecutive backticks.
* \param s a string to test for validity as an attribute name.
*/
int
good_atr_name(char const *s)
{
const unsigned char *a;
int len = 0;
if (!s || !*s)
return 0;
if (*s == '`')
return 0;
if (strstr(s, "``"))
return 0;
for (a = (const unsigned char *) s; *a; a++, len++)
if (!atr_name_table[*a])
return 0;
if (*(s + len - 1) == '`')
return 0;
return len <= ATTRIBUTE_NAME_LIMIT;
}
/** Find an attribute table entry, given a name.
* A trivial wrapper around aname_hash_lookup.
* \param string an attribute name.
*/
ATTR *
atr_match(const char *string)
{
return aname_hash_lookup(string);
}
/** Find the first attribute branching off the specified attribute.
* \param branch the attribute to look under
*/
ATTR *
atr_sub_branch(ATTR *branch)
{
char const *name, *n2;
size_t len;
name = AL_NAME(branch);
len = strlen(name);
for (branch = AL_NEXT(branch); branch; branch = AL_NEXT(branch)) {
n2 = AL_NAME(branch);
if (strlen(n2) <= len)
return NULL;
if (n2[len] == '`') {
if (!strncmp(n2, name, len))
return branch;
else
return NULL;
}
}
return NULL;
}
/** Scan an attribute list for an attribute with the specified name.
* This continues from whatever start point is passed in.
* \param atr the start of the list to search from
* \param name the attribute name to look for
* \return the matching attribute, or NULL
*/
static ATTR *
find_atr_in_list(ATTR *atr, char const *name)
{
int comp;
while (atr) {
comp = strcoll(name, AL_NAME(atr));
if (comp < 0)
return NULL;
if (comp == 0)
return atr;
atr = AL_NEXT(atr);
}
return NULL;
}
/** Find the place to insert/delete an attribute with the specified name.
* \param pos a pointer to the ATTR ** holding the list position
* \param name the attribute name to look for
* \return the matching attribute, or NULL if no matching attribute
*/
static ATTR *
find_atr_pos_in_list(ATTR ***pos, char const *name)
{
int comp;
while (**pos) {
comp = strcoll(name, AL_NAME(**pos));
if (comp < 0)
return NULL;
if (comp == 0)
return **pos;
*pos = &AL_NEXT(**pos);
}
return NULL;
}
/** Convert a string of attribute flags to a bitmask.
* Given a space-separated string of attribute flags, look them up
* and return a bitmask of them if player is permitted to use
* all of those flags.
* \param player the dbref to use for privilege checks.
* \param p a space-separated string of attribute flags.
* \return an attribute flag bitmask.
*/
int
string_to_atrflag(dbref player, char const *p)
{
int f;
f = string_to_privs(attr_privs, p, 0);
if (!f)
return -1;
if (!Hasprivs(player) && (f & AF_MDARK))
return -1;
if (!See_All(player) && (f & AF_WIZARD))
return -1;
return f;
}
/** Convert an attribute flag bitmask into a list of the full
* names of the flags.
* \param mask the bitmask of attribute flags to display.
* \return a pointer to a static buffer with the full names of the flags.
*/
const char *
atrflag_to_string(int mask)
{
return privs_to_string(attr_privs, mask);
}
/*======================================================================*/
/** Traversal routine for Can_Read_Attr.
* This function determines if an attribute can be read by examining
* the tree path to the attribute. This is not the full Can_Read_Attr
* check; only the stuff after See_All (just to avoid function calls
* when the answer is trivialized by special powers). If the specified
* player is NOTHING, then we're doing a generic mortal visibility check.
* \param player the player trying to do the read.
* \param obj the object targetted for the read (may be a child of a parent!).
* \param atr the attribute being interrogated.
* \retval 0 if the player cannot read the attribute.
* \retval 1 if the player can read the attribute.
*/
int
can_read_attr_internal(dbref player, dbref obj, ATTR *atr)
{
static char name[ATTRIBUTE_NAME_LIMIT + 1];
char *p;
int cansee;
int canlook;
dbref target;
dbref ancestor;
int visible;
int parent_depth;
visible = (player == NOTHING);
if (visible) {
cansee = (Visual(obj) &&
eval_lock(PLAYER_START, obj, Examine_Lock) &&
eval_lock(MASTER_ROOM, obj, Examine_Lock));
canlook = 0;
} else {
cansee = controls(player, obj) ||
(Visual(obj) && eval_lock(player, obj, Examine_Lock));
canlook = can_look_at(player, obj);
}
/* Take an easy out if there is one... */
/* If we can't see the attribute itself, then that's easy. */
if (AF_Internal(atr) || AF_Mdark(atr) ||
!(cansee ||
(AF_Visual(atr) && (!AF_Nearby(atr) || canlook)) ||
(!visible && !Mistrust(player) &&
(Owner(AL_CREATOR(atr)) == Owner(player)))))
return 0;
/* If the attribute isn't on a branch, then that's also easy. */
if (!strchr(AL_NAME(atr), '`'))
return 1;
/* Nope, we actually have to go looking for the attribute in a tree. */
strcpy(name, AL_NAME(atr));
ancestor = Ancestor_Parent(obj);
target = obj;
parent_depth = 0;
while (parent_depth < MAX_PARENTS && GoodObject(target)) {
/* If the ancestor of the object is in its explict parent chain,
* we use it there, and don't check the ancestor later.
*/
if (target == ancestor)
ancestor = NOTHING;
atr = List(target);
/* Check along the branch for permissions... */
for (p = strchr(name, '`'); p; p = strchr(p + 1, '`')) {
*p = '\0';
atr = find_atr_in_list(atr, name);
if (!atr || (target != obj && AF_Private(atr))) {
*p = '`';
goto continue_target;
}
if (AF_Internal(atr) || AF_Mdark(atr) ||
!(cansee ||
(AF_Visual(atr) && (!AF_Nearby(atr) || canlook)) ||
(!visible && !Mistrust(player) &&
(Owner(AL_CREATOR(atr)) == Owner(player)))))
return 0;
*p = '`';
}
/* Now actually find the attribute. */
atr = find_atr_in_list(atr, name);
if (atr)
return 1;
continue_target:
/* Attribute wasn't on this object. Check a parent or ancestor. */
parent_depth++;
target = Parent(target);
if (!GoodObject(target)) {
parent_depth = 0;
target = ancestor;
}
}
return 0;
}
/** Utility define for can_write_attr_internal and can_create_attr.
* \param p the player trying to write
* \param a the attribute to be written
* \param s obey the safe flag?
*/
#define Cannot_Write_This_Attr(p,a,s) \
(!God((p)) && \
(AF_Internal((a)) || \
((s) && AF_Safe((a))) || \
!(Wizard((p)) || \
(!AF_Wizard((a)) && \
(!AF_Locked((a)) || (AL_CREATOR((a)) == Owner((p))))))))
/** Traversal routine for Can_Write_Attr.
* This function determines if an attribute can be written by examining
* the tree path to the attribute. As a side effect, missing_name is
* set to the name of a missing prefix branch, if any. Yes, side effects
* are evil. Please fix if you can.
* \param player the player trying to do the write.
* \param obj the object targetted for the write.
* \param atr the attribute being interrogated.
* \param safe whether to check the safe attribute flag.
* \retval 0 if the player cannot write the attribute.
* \retval 1 if the player can write the attribute.
*/
int
can_write_attr_internal(dbref player, dbref obj, ATTR *atr, int safe)
{
char *p;
missing_name[0] = '\0';
if (Cannot_Write_This_Attr(player, atr, safe))
return 0;
strcpy(missing_name, AL_NAME(atr));
atr = List(obj);
for (p = strchr(missing_name, '`'); p; p = strchr(p + 1, '`')) {
*p = '\0';
atr = find_atr_in_list(atr, missing_name);
if (!atr)
return 0;
if (Cannot_Write_This_Attr(player, atr, safe)) {
missing_name[0] = '\0';
return 0;
}
*p = '`';
}
return 1;
}
/** Utility define for atr_add and can_create_attr */
#define set_default_flags(atr,flags) \
do { \
ATTR *std = atr_match(AL_NAME((atr))); \
if (std && !strcmp(AL_NAME(std), AL_NAME((atr)))) { \
AL_FLAGS(atr) = AL_FLAGS(std); \
} else { \
AL_FLAGS(atr) = 0; \
if (flags != NOTHING) \
AL_FLAGS(atr) |= flags; \
} \
} while (0)
/** Can an attribute of specified name be created?
* This function determines if an attribute can be created by examining
* the tree path to the attribute, and the standard attribute flags for
* those parts of the path that don't exist yet.
* \param player the player trying to do the write.
* \param obj the object targetted for the write.
* \param atr the attribute being interrogated.
* \param flags the default flags to add to the attribute.
* \retval 0 if the player cannot write the attribute.
* \retval 1 if the player can write the attribute.
*/
static int
can_create_attr(dbref player, dbref obj, char const *atr_name, int flags)
{
char *p;
ATTR tmpatr, *atr;
int num_new = 1;
missing_name[0] = '\0';
atr = &tmpatr;
AL_CREATOR(atr) = player;
AL_NAME(atr) = atr_name;
set_default_flags(atr, flags);
if (Cannot_Write_This_Attr(player, atr, 1))
return 0;
strcpy(missing_name, atr_name);
atr = List(obj);
for (p = strchr(missing_name, '`'); p; p = strchr(p + 1, '`')) {
*p = '\0';
if (atr != &tmpatr)
atr = find_atr_in_list(atr, missing_name);
if (!atr) {
atr = &tmpatr;
AL_CREATOR(atr) = Owner(player);
}
if (atr == &tmpatr) {
AL_NAME(atr) = missing_name;
set_default_flags(atr, flags);
num_new++;
}
if (Cannot_Write_This_Attr(player, atr, 1)) {
missing_name[0] = '\0';
return 0;
}
*p = '`';
}
if (AttrCount(obj) + num_new > MAX_ATTRCOUNT) {
do_log(LT_ERR, player, obj,
T("Attempt by %s(%d) to create too many attributes on %s(%d)"),
Name(player), player, Name(obj), obj);
return 0;
}
return 1;
}
/*======================================================================*/
/** Do the work of creating the attribute entry on an object.
* This doesn't do any permissions checking. You should do that yourself.
* \param thing the object to hold the attribute
* \param atr_name the name for the attribute
*/
static ATTR *
create_atr(dbref thing, char const *atr_name)
{
ATTR *ptr, **ins;
char const *name;
/* put the name in the string table */
name = st_insert(atr_name, &atr_names);
if (!name)
return NULL;
/* allocate a new page, if needed */
ptr = get_atr_free_list();
atr_free_list = AL_NEXT(ptr);
/* initialize atr */
AL_NAME(ptr) = name;
ptr->data = NULL_CHUNK_REFERENCE;
/* link it in */
ins = &List(thing);
(void) find_atr_pos_in_list(&ins, AL_NAME(ptr));
AL_NEXT(ptr) = *ins;
*ins = ptr;
AttrCount(thing)++;
return ptr;
}
/** Add an attribute to an object, dangerously.
* This is a stripped down version of atr_add, without duplicate checking,
* permissions checking, attribute count checking, or auto-ODARKing.
* If anyone uses this outside of database load or atr_cpy (below),
* I will personally string them up by their toes. - Alex
* \param thing object to set the attribute on.
* \param atr name of the attribute to set.
* \param s value of the attribute to set.
* \param player the attribute creator.
* \param flags bitmask of attribute flags for this attribute.
* \param derefs the initial deref count to use for the attribute value.
*/
void
atr_new_add(dbref thing, const char *RESTRICT atr, const char *RESTRICT s,
dbref player, int flags, unsigned char derefs)
{
ATTR *ptr;
if (!EMPTY_ATTRS && !*s)
return;
/* Don't fail on a bad name, but do log it */
if (!good_atr_name(atr))
do_rawlog(LT_ERR, T("Bad attribute name %s on object %s"), atr,
unparse_dbref(thing));
ptr = create_atr(thing, atr);
if (!ptr)
return;
AL_FLAGS(ptr) = (flags != NOTHING) ? flags : 0;
AL_FLAGS(ptr) &= ~AF_COMMAND & ~AF_LISTEN;
AL_CREATOR(ptr) = player;
/* replace string with new string */
if (!s || !*s) {
/* nothing */
} else {
unsigned char *t = compress(s);
if (!t)
return;
ptr->data = chunk_create(t, u_strlen(t), derefs);
free(t);
if (*s == '$')
AL_FLAGS(ptr) |= AF_COMMAND;
if (*s == '^')
AL_FLAGS(ptr) |= AF_LISTEN;
}
}
/** Attribute error - invalid name */
#define AE_BADNAME -3
/** Attribute error - attempt to overwrite a safe attribute */
#define AE_SAFE -2
/** Attribute error - general failure */
#define AE_ERROR -1
/** Add an attribute to an object, safely.
* \verbatim
* This is the function that should be called in hardcode to add
* an attribute to an object (but not to process things like @set that
* may add or clear an attribute - see do_set_atr() for that).
* \endverbatim
* \param thing object to set the attribute on.
* \param atr name of the attribute to set.
* \param s value of the attribute to set.
* \param player the attribute creator.
* \param flags bitmask of attribute flags for this attribute.
* \retval AE_BADNAME invalid attribute name.
* \retval AE_SAFE attempt to overwrite a SAFE attribute.
* \retval AE_ERROR general failure.
* \retval 1 success.
*/
int
atr_add(dbref thing, const char *RESTRICT atr, const char *RESTRICT s,
dbref player, int flags)
{
ATTR *ptr;
char *p;
if (!s || (!EMPTY_ATTRS && !*s))
return atr_clr(thing, atr, player);
if (!good_atr_name(atr))
return AE_BADNAME;
/* walk the list, looking for a preexisting value */
ptr = find_atr_in_list(List(thing), atr);
/* check for permission to modify existing atr */
if (ptr && AF_Safe(ptr))
return AE_SAFE;
if (ptr && !Can_Write_Attr(player, thing, ptr))
return AE_ERROR;
/* make a new atr, if needed */
if (!ptr) {
if (!can_create_attr(player, thing, atr, flags))
return AE_ERROR;
strcpy(missing_name, atr);
ptr = List(thing);
for (p = strchr(missing_name, '`'); p; p = strchr(p + 1, '`')) {
*p = '\0';
ptr = find_atr_in_list(ptr, missing_name);
if (!ptr) {
ptr = create_atr(thing, missing_name);
if (!ptr)
return AE_ERROR;
/* update modification time here, because from now on,
* we modify even if we fail */
if (!IsPlayer(thing) && !AF_Nodump(ptr))
ModTime(thing) = mudtime;
set_default_flags(ptr, flags);
AL_FLAGS(ptr) &= ~AF_COMMAND & ~AF_LISTEN;
AL_CREATOR(ptr) = Owner(player);
if (!EMPTY_ATTRS) {
unsigned char *t = compress(" ");
if (!t)
return AE_ERROR;
ptr->data = chunk_create(t, u_strlen(t), 0);
free(t);
}
}
*p = '`';
}
ptr = create_atr(thing, atr);
if (!ptr)
return AE_ERROR;
set_default_flags(ptr, flags);
}
/* update modification time here, because from now on,
* we modify even if we fail */
if (!IsPlayer(thing) && !AF_Nodump(ptr))
ModTime(thing) = mudtime;
/* change owner */
AL_CREATOR(ptr) = Owner(player);
AL_FLAGS(ptr) &= ~AF_COMMAND & ~AF_LISTEN;
/* replace string with new string */
if (ptr->data)
chunk_delete(ptr->data);
if (!s || !*s) {
ptr->data = NULL_CHUNK_REFERENCE;
} else {
unsigned char *t = compress(s);
if (!t) {
ptr->data = NULL_CHUNK_REFERENCE;
return AE_ERROR;
}
ptr->data = chunk_create(t, u_strlen(t), 0);
free(t);
if (*s == '$')
AL_FLAGS(ptr) |= AF_COMMAND;
if (*s == '^')
AL_FLAGS(ptr) |= AF_LISTEN;
}
return 1;
}
/** Remove an attribute from an object.
* This function clears an attribute from an object.
* Permission is denied if the attribute is a branch, not a leaf.
* \param thing object to clear attribute from.
* \param atr name of attribute to remove.
* \param player enactor attempting to remove attribute.
* \retval 0 no attribute found to reset
* \retval AE_SAFE attribute is safe
* \retval AE_ERROR other failure
*/
int
atr_clr(dbref thing, char const *atr, dbref player)
{
ATTR *ptr, **prev, *sub;
size_t len;
prev = &List(thing);
ptr = find_atr_pos_in_list(&prev, atr);
if (!ptr)
return 0;
if (ptr && AF_Safe(ptr))
return AE_SAFE;
if (!Can_Write_Attr(player, thing, ptr))
return AE_ERROR;
sub = atr_sub_branch(ptr);
if (!we_are_wiping && sub)
return AE_ERROR;
if (!IsPlayer(thing) && !AF_Nodump(ptr))
ModTime(thing) = mudtime;
*prev = AL_NEXT(ptr);
if (ptr->data)
chunk_delete(ptr->data);
len = strlen(AL_NAME(ptr));
st_delete(AL_NAME(ptr), &atr_names);
AL_NEXT(ptr) = atr_free_list;
AL_FLAGS(ptr) = 0;
atr_free_list = ptr;
AttrCount(thing)--;
if (we_are_wiping && sub) {
while (*prev != sub)
prev = &AL_NEXT(*prev);
ptr = *prev;
while (ptr && strlen(AL_NAME(ptr)) > len && AL_NAME(ptr)[len] == '`') {
*prev = AL_NEXT(ptr);
if (ptr->data)
chunk_delete(ptr->data);
st_delete(AL_NAME(ptr), &atr_names);
AL_NEXT(ptr) = atr_free_list;
AL_FLAGS(ptr) = 0;
atr_free_list = ptr;
AttrCount(thing)--;
ptr = *prev;
}
}
return 1;
}
/** Retrieve an attribute from an object or its ancestors.
* This function retrieves an attribute from an object, or from its
* parent chain, returning a pointer to the first attribute that
* matches or NULL. This is a pointer to an attribute structure, not
* to the value of the attribute, so the value is usually accessed
* through atr_value() or safe_atr_value().
* \param obj the object containing the attribute.
* \param atrname the name of the attribute.
* \return pointer to the attribute structure retrieved, or NULL.
*/
ATTR *
atr_get(dbref obj, char const *atrname)
{
return atr_get_with_parent(obj, atrname, NULL);
}
static ATTR *
atr_get_with_parent(dbref obj, char const *atrname, dbref *parent)
{
static char name[ATTRIBUTE_NAME_LIMIT + 1];
char *p;
ATTR *atr;
int parent_depth;
dbref target;
dbref ancestor;
if (obj == NOTHING || !good_atr_name(atrname))
return NULL;
/* First try given name, then try alias match. */
strcpy(name, atrname);
for (;;) {
/* Hunt through the parents/ancestor chain... */
ancestor = Ancestor_Parent(obj);
target = obj;
parent_depth = 0;
while (parent_depth < MAX_PARENTS && GoodObject(target)) {
/* If the ancestor of the object is in its explict parent chain,
* we use it there, and don't check the ancestor later.
*/
if (target == ancestor)
ancestor = NOTHING;
atr = List(target);
/* If we're looking at a parent/ancestor, then we
* need to check the branch path for privacy... */
if (target != obj) {
for (p = strchr(name, '`'); p; p = strchr(p + 1, '`')) {
*p = '\0';
atr = find_atr_in_list(atr, name);
if (!atr || AF_Private(atr)) {
*p = '`';
goto continue_target;
}
*p = '`';
}
}
/* Now actually find the attribute. */
atr = find_atr_in_list(atr, name);
if (atr && (target == obj || !AF_Private(atr))) {
if (parent)
*parent = target;
return atr;
}
continue_target:
/* Attribute wasn't on this object. Check a parent or ancestor. */
parent_depth++;
target = Parent(target);
if (!GoodObject(target)) {
parent_depth = 0;
target = ancestor;
}
}
/* Try the alias, too... */
atr = atr_match(atrname);
if (!atr || !strcmp(name, AL_NAME(atr)))
break;
strcpy(name, AL_NAME(atr));
}
return NULL;
}
/** Retrieve an attribute from an object.
* This function retrieves an attribute from an object, and does not
* check the parent chain. It returns a pointer to the attribute
* or NULL. This is a pointer to an attribute structure, not
* to the value of the attribute, so the (compressed) value is usually
* to the value of the attribute, so the value is usually accessed
* through atr_value() or safe_atr_value().
* \param thing the object containing the attribute.
* \param atr the name of the attribute.
* \return pointer to the attribute structure retrieved, or NULL.
*/
ATTR *
atr_get_noparent(dbref thing, char const *atr)
{
ATTR *ptr;
if (thing == NOTHING || !good_atr_name(atr))
return NULL;
/* try real name */
ptr = find_atr_in_list(List(thing), atr);
if (ptr)
return ptr;
ptr = atr_match(atr);
if (!ptr || !strcmp(atr, AL_NAME(ptr)))
return NULL;
atr = AL_NAME(ptr);
/* try alias */
ptr = find_atr_in_list(List(thing), atr);
if (ptr)
return ptr;
return NULL;
}
/** Apply a function to a set of attributes.
* This function applies another function to a set of attributes on an
* object specified by a (wildcarded) pattern to match against the
* attribute name.
* \param player the enactor.
* \param thing the object containing the attribute.
* \param name the pattern to match against the attribute name.
* \param mortal only fetch mortal-visible attributes?
* \param func the function to call for each matching attribute.
* \param args additional arguments to pass to the function.
* \return the sum of the return values of the functions called.
*/
int
atr_iter_get(dbref player, dbref thing, const char *name, int mortal,
aig_func func, void *args)
{
ATTR *ptr, **indirect;
int result;
int len;
result = 0;
if (!name || !*name)
name = "*";
len = strlen(name);
if (!wildcard(name) && name[len - 1] != '`') {
ptr = atr_get_noparent(thing, strupper(name));
if (ptr && (mortal ? Is_Visible_Attr(thing, ptr)
: Can_Read_Attr(player, thing, ptr)))
result = func(player, thing, NOTHING, name, ptr, args);
} else {
indirect = &List(thing);
while (*indirect) {
ptr = *indirect;
if ((mortal ? Is_Visible_Attr(thing, ptr)
: Can_Read_Attr(player, thing, ptr)) && atr_wild(name, AL_NAME(ptr)))
result += func(player, thing, NOTHING, name, ptr, args);
if (ptr == *indirect)
indirect = &AL_NEXT(ptr);
}
}
return result;
}
/** Count the number of attributes an object has that match a pattern,
* If <doparent> is true, then count parent attributes as well,
* but excluding duplicates.
* \param player the enactor.
* \param thing the object containing the attribute.
* \param name the pattern to match against the attribute name.
* \param mortal only fetch mortal-visible attributes?
* \param doparent count parent attrbutes as well?
* \return the count of matching attributes
*/
int
atr_pattern_count(dbref player, dbref thing, const char *name,
int doparent, int mortal)
{
ATTR *ptr, **indirect;
int result;
int len;
dbref parent = NOTHING;
result = 0;
if (!name || !*name)
name = "*";
len = strlen(name);
if (!wildcard(name) && name[len - 1] != '`') {
parent = thing;
if (doparent)
ptr = atr_get_with_parent(thing, strupper(name), &parent);
else
ptr = atr_get_noparent(thing, strupper(name));
if (ptr && (mortal ? Is_Visible_Attr(parent, ptr)
: Can_Read_Attr(player, parent, ptr)))
result += 1;
} else {
StrTree seen;
int parent_depth;
st_init(&seen);
for (parent_depth = MAX_PARENTS + 1, parent = thing;
(parent_depth-- && parent != NOTHING) &&
(doparent || (parent == thing)); parent = Parent(parent)) {
indirect = &List(parent);
while (*indirect) {
ptr = *indirect;
if (!st_find(AL_NAME(ptr), &seen)) {
st_insert(AL_NAME(ptr), &seen);
if ((parent == thing) || !AF_Private(ptr)) {
if ((mortal ? Is_Visible_Attr(parent, ptr)
: Can_Read_Attr(player, parent, ptr))
&& atr_wild(name, AL_NAME(ptr)))
result += 1;
}
}
if (ptr == *indirect)
indirect = &AL_NEXT(ptr);
}
}
st_flush(&seen);
}
return result;
}
/** Apply a function to a set of attributes, including inherited ones.
* This function applies another function to a set of attributes on an
* object specified by a (wildcarded) pattern to match against the
* attribute name on an object or its parents.
* \param player the enactor.
* \param thing the object containing the attribute.
* \param name the pattern to match against the attribute name.
* \param mortal only fetch mortal-visible attributes?
* \param func the function to call for each matching attribute, with
* a pointer to the dbref of the object the attribute is really on passed
* as the function's args argument.
* \return the sum of the return values of the functions called.
*/
int
atr_iter_get_parent(dbref player, dbref thing, const char *name, int mortal,
aig_func func, void *args)
{
ATTR *ptr, **indirect;
int result;
int len;
dbref parent = NOTHING;
result = 0;
if (!name || !*name)
name = "*";
len = strlen(name);
if (!wildcard(name) && name[len - 1] != '`') {
ptr = atr_get_with_parent(thing, strupper(name), &parent);
if (ptr && (mortal ? Is_Visible_Attr(parent, ptr)
: Can_Read_Attr(player, parent, ptr)))
result = func(player, thing, parent, name, ptr, args);
} else {
StrTree seen;
int parent_depth;
st_init(&seen);
for (parent_depth = MAX_PARENTS + 1, parent = thing;
parent_depth-- && parent != NOTHING; parent = Parent(parent)) {
indirect = &List(parent);
while (*indirect) {
ptr = *indirect;
if (!st_find(AL_NAME(ptr), &seen)) {
st_insert(AL_NAME(ptr), &seen);
if ((parent == thing) || !AF_Private(ptr)) {
if ((mortal ? Is_Visible_Attr(parent, ptr)
: Can_Read_Attr(player, parent, ptr))
&& atr_wild(name, AL_NAME(ptr)))
result += func(player, thing, parent, name, ptr, args);
}
}
if (ptr == *indirect)
indirect = &AL_NEXT(ptr);
}
}
st_flush(&seen);
}
return result;
}
/** Free the memory associated with all attributes of an object.
* This function frees all of an object's attribute memory.
* This includes the memory allocated to hold the attribute's value,
* and the attribute's entry in the object's string tree.
* Freed attribute structures are added to the free list.
* \param thing dbref of object
*/
void
atr_free(dbref thing)
{
ATTR *ptr;
if (!List(thing))
return;
if (!IsPlayer(thing))
ModTime(thing) = mudtime;
while ((ptr = List(thing))) {
List(thing) = AL_NEXT(ptr);
if (ptr->data)
chunk_delete(ptr->data);
st_delete(AL_NAME(ptr), &atr_names);
AL_NEXT(ptr) = atr_free_list;
atr_free_list = ptr;
}
}
/** Copy all of the attributes from one object to another.
* \verbatim
* This function is used by @clone to copy all of the attributes
* from one object to another.
* \endverbatim
* \param dest destination object to receive attributes.
* \param source source object containing attributes.
*/
void
atr_cpy(dbref dest, dbref source)
{
ATTR *ptr;
List(dest) = NULL;
for (ptr = List(source); ptr; ptr = AL_NEXT(ptr))
if (!AF_Nocopy(ptr)
&& (AttrCount(dest) < MAX_ATTRCOUNT)) {
atr_new_add(dest, AL_NAME(ptr), atr_value(ptr),
AL_CREATOR(ptr), AL_FLAGS(ptr), AL_DEREFS(ptr));
AttrCount(dest)++;
}
}
/** Structure for keeping track of which attributes have appeared
* on children when doing command matching. */
typedef struct used_attr {
struct used_attr *next; /**< Next attribute in list */
char const *name; /**< The name of the attribute */
int no_prog; /**< Was it AF_NOPROG */
} UsedAttr;
/** Find an attribute in the list of seen attributes.
* Since attributes are checked in collation order, the pointer to the
* list is updated to reflect the current search position.
* For efficiency of insertions, the pointer used is a trailing pointer,
* pointing at the pointer to the next used struct.
* To allow a useful return code, the pointer used is actually a pointer
* to the pointer mentioned above. Yes, I know three-star coding is bad,
* but I have good reason, here.
* \param prev the pointer to the pointer to the pointer to the next
* used attribute.
* \param name the name of the attribute to look for.
* \retval 0 the attribute was not in the list,
* **prev now points to the next atfer.
* \retval 1 the attribute was in the list,
* **prev now points to the entry for it.
*/
static int
find_attr(UsedAttr *** prev, char const *name)
{
int comp;
comp = 1;
while (**prev) {
comp = strcoll(name, prev[0][0]->name);
if (comp <= 0)
break;
*prev = &prev[0][0]->next;
}
return comp == 0;
}
/** Insert an attribute in the list of seen attributes.
* Since attributes are inserted in collation order, an updated insertion
* point is returned (so subsequent calls don't have to go hunting as far).
* \param prev the pointer to the pointer to the attribute list.
* \param name the name of the attribute to insert.
* \param no_prog the AF_NOPROG value from the attribute.
* \return the pointer to the pointer to the next attribute after
* the one inserted.
*/
static UsedAttr **
use_attr(UsedAttr ** prev, char const *name, int no_prog)
{
int found;
UsedAttr *used;
found = find_attr(&prev, name);
if (!found) {
used = mush_malloc(sizeof *used, "used_attr");
used->next = *prev;
used->name = name;
used->no_prog = 0;
*prev = used;
}
prev[0]->no_prog |= no_prog;
/* do_rawlog(LT_TRACE, "Recorded %s: %d -> %d", name,
no_prog, prev[0]->no_prog); */
return &prev[0]->next;
}
/** Match input against a $command or ^listen attribute.
* This function attempts to match a string against either the $commands
* or ^listens on an object. Matches may be glob or regex matches,
* depending on the attribute's flags. With the reasonably safe assumption
* that most of the matches are going to fail, the faster non-capturing
* glob match is done first, and the capturing version only called when
* we already know it'll match. Due to the way PCRE works, there's no
* advantage to doing something similar for regular expression matches.
* \param thing object containing attributes to check.
* \param player the enactor, for privilege checks.
* \param type either '$' or '^', indicating the type of attribute to check.
* \param end character that denotes the end of a command (usually ':').
* \param str string to match against attributes.
* \param just_match if true, return match without executing code.
* \param atrname used to return the list of matching object/attributes.
* \param abp pointer to end of atrname.
* \param errobj if an attribute matches, but the lock fails, this pointer
* is used to return the failing dbref. If NULL, we don't bother.
* \return number of attributes that matched, or 0
*/
int
atr_comm_match(dbref thing, dbref player, int type, int end, char const *str,
int just_match, char *atrname, char **abp, dbref *errobj)
{
int flag_mask;
ATTR *ptr;
int parent_depth;
char tbuf1[BUFFER_LEN];
char tbuf2[BUFFER_LEN];
char *s;
int match, match_found;
dbref parent;
UsedAttr *used_list, **prev;
ATTR *skip[ATTRIBUTE_NAME_LIMIT / 2];
int skipcount;
int lock_checked = 0;
/* check for lots of easy ways out */
if ((type != '$' && type != '^') || !GoodObject(thing) || Halted(thing)
|| (type == '$' && NoCommand(thing)))
return 0;
if (type == '$') {
flag_mask = AF_COMMAND;
parent_depth = GoodObject(Parent(thing));
} else {
flag_mask = AF_LISTEN;
if (ThingInhearit(thing) || RoomInhearit(thing)) {
parent_depth = GoodObject(Parent(thing));
} else {
parent_depth = 0;
}
}
match = 0;
used_list = NULL;
prev = &used_list;
skipcount = 0;
/* do_rawlog(LT_TRACE, "Searching %s:", Name(thing)); */
for (ptr = List(thing); ptr; ptr = AL_NEXT(ptr)) {
if (skipcount && ptr == skip[skipcount - 1]) {
size_t len = strrchr(AL_NAME(ptr), '`') - AL_NAME(ptr);
while (AL_NEXT(ptr) && strlen(AL_NAME(AL_NEXT(ptr))) > len &&
AL_NAME(AL_NEXT(ptr))[len] == '`') {
ptr = AL_NEXT(ptr);
/* do_rawlog(LT_TRACE, " Skipping %s", AL_NAME(ptr)); */
}
skipcount--;
continue;
}
if (parent_depth)
prev = use_attr(prev, AL_NAME(ptr), AF_Noprog(ptr));
if (AF_Noprog(ptr)) {
skip[skipcount] = atr_sub_branch(ptr);
if (skip[skipcount])
skipcount++;
continue;
}
if (!(AL_FLAGS(ptr) & flag_mask))
continue;
strcpy(tbuf1, atr_value(ptr));
s = tbuf1;
do {
s = strchr(s + 1, end);
} while (s && s[-1] == '\\');
if (!s)
continue;
*s++ = '\0';
if (AF_Regexp(ptr)) {
/* Turn \: into : */
char *from, *to;
for (from = tbuf1, to = tbuf2; *from; from++, to++) {
if (*from == '\\' && *(from + 1) == ':')
from++;
*to = *from;
}
*to = '\0';
} else
strcpy(tbuf2, tbuf1);
match_found = 0;
if (AF_Regexp(ptr)) {
if (regexp_match_case(tbuf2 + 1, str, AF_Case(ptr))) {
match_found = 1;
match++;
}
} else {
if (quick_wild_new(tbuf2 + 1, str, AF_Case(ptr))) {
match_found = 1;
match++;
wild_match_case(tbuf2 + 1, str, AF_Case(ptr));
}
}
if (match_found) {
/* We only want to do the lock check once, so that any side
* effects in the lock are only performed once per utterance.
* Thus, '$foo *r:' and '$foo b*:' on the same object will only
* run the lock once for 'foo bar'.
*/
if (!lock_checked) {
lock_checked = 1;
if ((type == '$' && !eval_lock(player, thing, Command_Lock))
|| (type == '^' && !eval_lock(player, thing, Listen_Lock))
|| !eval_lock(player, thing, Use_Lock)) {
match--;
if (errobj)
*errobj = thing;
/* If we failed the lock, there's no point in continuing at all. */
goto exit_sequence;
}
}
if (atrname && abp) {
safe_chr(' ', atrname, abp);
safe_dbref(thing, atrname, abp);
safe_chr('/', atrname, abp);
safe_str(AL_NAME(ptr), atrname, abp);
}
if (!just_match)
parse_que(thing, s, player);
}
}
/* Don't need to free used_list here, because if !parent_depth,
* we would never have allocated it. */
if (!parent_depth)
return match;
for (parent_depth = MAX_PARENTS, parent = Parent(thing);
parent_depth-- && parent != NOTHING; parent = Parent(parent)) {
/* do_rawlog(LT_TRACE, "Searching %s:", Name(parent)); */
skipcount = 0;
prev = &used_list;
for (ptr = List(parent); ptr; ptr = AL_NEXT(ptr)) {
if (skipcount && ptr == skip[skipcount - 1]) {
size_t len = strrchr(AL_NAME(ptr), '`') - AL_NAME(ptr);
while (AL_NEXT(ptr) && strlen(AL_NAME(AL_NEXT(ptr))) > len &&
AL_NAME(AL_NEXT(ptr))[len] == '`') {
ptr = AL_NEXT(ptr);
/* do_rawlog(LT_TRACE, " Skipping %s", AL_NAME(ptr)); */
}
skipcount--;
continue;
}
if (AF_Private(ptr)) {
/* do_rawlog(LT_TRACE, "Private %s:", AL_NAME(ptr)); */
skip[skipcount] = atr_sub_branch(ptr);
if (skip[skipcount])
skipcount++;
continue;
}
if (find_attr(&prev, AL_NAME(ptr))) {
/* do_rawlog(LT_TRACE, "Found %s:", AL_NAME(ptr)); */
if (prev[0]->no_prog || AF_Noprog(ptr)) {
skip[skipcount] = atr_sub_branch(ptr);
if (skip[skipcount])
skipcount++;
prev[0]->no_prog = AF_NOPROG;
}
continue;
}
if (GoodObject(Parent(parent)))
prev = use_attr(prev, AL_NAME(ptr), AF_Noprog(ptr));
if (AF_Noprog(ptr)) {
/* do_rawlog(LT_TRACE, "NoProg %s:", AL_NAME(ptr)); */
skip[skipcount] = atr_sub_branch(ptr);
if (skip[skipcount])
skipcount++;
continue;
}
if (!(AL_FLAGS(ptr) & flag_mask))
continue;
strcpy(tbuf1, atr_value(ptr));
s = tbuf1;
do {
s = strchr(s + 1, end);
} while (s && s[-1] == '\\');
if (!s)
continue;
*s++ = '\0';
if (AF_Regexp(ptr)) {
/* Turn \: into : */
char *from, *to;
for (from = tbuf1, to = tbuf2; *from; from++, to++) {
if (*from == '\\' && *(from + 1) == ':')
from++;
*to = *from;
}
*to = '\0';
} else
strcpy(tbuf2, tbuf1);
match_found = 0;
if (AF_Regexp(ptr)) {
if (regexp_match_case(tbuf2 + 1, str, AF_Case(ptr))) {
match_found = 1;
match++;
}
} else {
if (quick_wild_new(tbuf2 + 1, str, AF_Case(ptr))) {
match_found = 1;
match++;
wild_match_case(tbuf2 + 1, str, AF_Case(ptr));
}
}
if (match_found) {
/* Since we're still checking the lock on the child, not the
* parent, we don't actually want to reset lock_checked with
* each parent checked. Sorry for the misdirection, Alan.
* - Alex */
if (!lock_checked) {
lock_checked = 1;
if ((type == '$' && !eval_lock(player, thing, Command_Lock))
|| (type == '^' && !eval_lock(player, thing, Listen_Lock))
|| !eval_lock(player, thing, Use_Lock)) {
match--;
if (errobj)
*errobj = thing;
/* If we failed the lock, there's no point in continuing at all. */
goto exit_sequence;
}
}
if (atrname && abp) {
safe_chr(' ', atrname, abp);
if (Can_Examine(player, parent))
safe_dbref(parent, atrname, abp);
else
safe_dbref(thing, atrname, abp);
safe_chr('/', atrname, abp);
safe_str(AL_NAME(ptr), atrname, abp);
}
if (!just_match) {
/* do_rawlog(LT_TRACE, "MATCHED %s:", AL_NAME(ptr)); */
parse_que(thing, s, player);
}
}
}
}
/* This is where I wish for 'try {} finally {}'... */
exit_sequence:
while (used_list) {
UsedAttr *temp = used_list->next;
mush_free(used_list, "used_attr");
used_list = temp;
}
return match;
}
/** Match input against a specified object's specified $command
* attribute. Matches may be glob or regex matches. Used in command hooks.
* depending on the attribute's flags.
* \param thing object containing attributes to check.
* \param player the enactor, for privilege checks.
* \param atr the name of the attribute
* \param str the string to match
* \retval 1 attribute matched.
* \retval 0 attribute failed to match.
*/
int
one_comm_match(dbref thing, dbref player, const char *atr, const char *str)
{
ATTR *ptr;
char tbuf1[BUFFER_LEN];
char tbuf2[BUFFER_LEN];
char *s;
/* check for lots of easy ways out */
if (!GoodObject(thing) || Halted(thing) || NoCommand(thing))
return 0;
if (!(ptr = atr_get(thing, atr)))
return 0;
if (AF_Noprog(ptr) || !AF_Command(ptr))
return 0;
strcpy(tbuf1, atr_value(ptr));
s = tbuf1;
do {
s = strchr(s + 1, ':');
} while (s && s[-1] == '\\');
if (!s)
return 0;
*s++ = '\0';
if (AF_Regexp(ptr)) {
/* Turn \: into : */
char *from, *to;
for (from = tbuf1, to = tbuf2; *from; from++, to++) {
if (*from == '\\' && *(from + 1) == ':')
from++;
*to = *from;
}
*to = '\0';
} else
strcpy(tbuf2, tbuf1);
if (AF_Regexp(ptr) ?
regexp_match_case(tbuf2 + 1, str, AF_Case(ptr)) :
wild_match_case(tbuf2 + 1, str, AF_Case(ptr))) {
if (!eval_lock(player, thing, Command_Lock)
|| !eval_lock(player, thing, Use_Lock))
return 0;
parse_que(thing, s, player);
return 1;
}
return 0;
}
/*======================================================================*/
/** Set or clear an attribute on an object.
* \verbatim
* This is the primary function for implementing @set.
* A new interface (as of 1.6.9p0) for setting attributes,
* which takes care of case-fixing, object-level flag munging,
* alias recognition, add/clr distinction, etc. Enjoy.
* \endverbatim
* \param thing object to set the attribute on or remove it from.
* \param atr name of the attribute to set or clear.
* \param s value to set the attribute to (or NULL to clear).
* \param player enactor, for permission checks.
* \param flags attribute flags.
* \retval -1 failure of one sort.
* \retval 0 failure of another sort.
* \retval 1 success.
*/
int
do_set_atr(dbref thing, const char *RESTRICT atr, const char *RESTRICT s,
dbref player, int flags)
{
ATTR *old;
char name[BUFFER_LEN];
char tbuf1[BUFFER_LEN];
int res;
int was_hearer;
int was_listener;
dbref contents;
if (!EMPTY_ATTRS && s && !*s)
s = NULL;
if (IsGarbage(thing)) {
notify(player, T("Garbage is garbage."));
return 0;
}
if (!controls(player, thing))
return 0;
strcpy(name, atr);
upcasestr(name);
if (!strcmp(name, "ALIAS") && IsPlayer(thing)) {
old = atr_get_noparent(thing, "ALIAS");
if (old) {
/* Old alias - we're allowed to change to a different case */
strcpy(tbuf1, atr_value(old));
if (s && (!*s || (strcasecmp(s, tbuf1) && !ok_player_name(s, player)))) {
notify(player, T("That is not a valid alias."));
return -1;
}
if (Can_Write_Attr(player, thing, old))
delete_player(thing, tbuf1);
} else {
/* No old alias */
if (s && *s && !ok_player_name(s, player)) {
notify(player, T("That is not a valid alias."));
return -1;
}
}
} else if (s && *s && (!strcmp(name, "FORWARDLIST")
|| !strcmp(name, "DEBUGFORWARDLIST"))) {
/* You can only set this to dbrefs of things you're allowed to
* forward to. If you get one wrong, we puke.
*/
char *fwdstr, *curr;
dbref fwd;
strcpy(tbuf1, s);
fwdstr = trim_space_sep(tbuf1, ' ');
while ((curr = split_token(&fwdstr, ' ')) != NULL) {
if (!is_objid(curr)) {
notify_format(player, T("%s should contain only dbrefs."), name);
return -1;
}
fwd = parse_objid(curr);
if (!GoodObject(fwd) || IsGarbage(fwd)) {
notify_format(player, T("Invalid dbref #%d in %s."), fwd, name);
return -1;
}
if (!Can_Forward(thing, fwd)) {
notify_format(player, T("I don't think #%d wants to hear from you."),
fwd);
return -1;
}
}
/* If you made it here, all your dbrefs were ok */
}
was_hearer = Hearer(thing);
was_listener = Listener(thing);
res =
s ? atr_add(thing, name, s, player, (flags & 0x02) ? AF_NOPROG : NOTHING)
: atr_clr(thing, name, player);
if (res == AE_SAFE) {
notify_format(player, T("Attribute %s is SAFE. Set it !SAFE to modify it."),
name);
return 0;
} else if (res == AE_BADNAME) {
notify(player, T("That's not a very good name for an attribute."));
return 0;
} else if (res == AE_ERROR) {
if (*missing_name) {
if (s && (EMPTY_ATTRS || *s))
notify_format(player, T("You must set %s first."), missing_name);
else
notify_format(player,
T("%s is a branch attribute; remove its children first."),
missing_name);
} else
notify(player, T("That attribute cannot be changed by you."));
return 0;
} else if (!res) {
notify(player, T("No such attribute to reset."));
return 0;
}
if (!strcmp(name, "ALIAS") && IsPlayer(thing)) {
if (s && *s) {
add_player(thing, s);
notify(player, T("Alias set."));
} else {
notify(player, T("Alias removed."));
}
return 1;
} else if (!strcmp(name, "LISTEN")) {
if (IsRoom(thing))
contents = Contents(thing);
else {
contents = Location(thing);
if (GoodObject(contents))
contents = Contents(contents);
}
if (GoodObject(contents)) {
if (!s && !was_listener && !Hearer(thing)) {
notify_except(contents, thing,
tprintf(T("%s loses its ears and becomes deaf."),
Name(thing)), NA_INTER_PRESENCE);
} else if (s && !was_hearer && !was_listener) {
notify_except(contents, thing,
tprintf(T("%s grows ears and can now hear."),
Name(thing)), NA_INTER_PRESENCE);
}
}
}
if ((flags & 0x01) && !AreQuiet(player, thing))
notify_format(player,
"%s/%s - %s.", Name(thing), name,
s ? T("Set") : T("Cleared"));
return 1;
}
/** Lock or unlock an attribute.
* Attribute locks are largely obsolete and should be deprecated,
* but this is the code that does them.
* \param player the enactor.
* \param arg1 the object/attribute, as a string.
* \param arg2 the desired lock status ('on' or 'off').
*/
void
do_atrlock(dbref player, const char *arg1, const char *arg2)
{
dbref thing;
char *p;
ATTR *ptr;
int status;
if (!arg2 || !*arg2)
status = 0;
else {
if (!strcasecmp(arg2, "on")) {
status = 1;
} else if (!strcasecmp(arg2, "off")) {
status = 2;
} else
status = 0;
}
if (!arg1 || !*arg1) {
notify(player, T("You need to give an object/attribute pair."));
return;
}
if (!(p = strchr(arg1, '/')) || !(*(p + 1))) {
notify(player, T("You need to give an object/attribute pair."));
return;
}
*p++ = '\0';
if ((thing = noisy_match_result(player, arg1, NOTYPE, MAT_EVERYTHING)) ==
NOTHING)
return;
if (!controls(player, thing)) {
notify(player, T("Permission denied."));
return;
}
ptr = atr_get_noparent(thing, strupper(p));
if (ptr && Can_Read_Attr(player, thing, ptr)) {
if (!status) {
notify_format(player, T("That attribute is %slocked."),
AF_Locked(ptr) ? "" : "un");
return;
} else if (!Can_Write_Attr(player, thing, ptr)) {
notify(player,
T("You need to be able to set the attribute to change its lock."));
return;
} else {
if (status == 1) {
AL_FLAGS(ptr) |= AF_LOCKED;
AL_CREATOR(ptr) = Owner(player);
notify(player, T("Attribute locked."));
return;
} else if (status == 2) {
AL_FLAGS(ptr) &= ~AF_LOCKED;
notify(player, T("Attribute unlocked."));
return;
} else {
notify(player, T("Invalid status on atrlock.. Notify god."));
return;
}
}
} else
notify(player, T("No such attribute."));
return;
}
/** Change ownership of an attribute.
* \verbatim
* This function is used to implement @atrchown.
* \endverbatim
* \param player the enactor, for permission checking.
* \param arg1 the object/attribute to change, as a string.
* \param arg2 the name of the new owner (or "me").
*/
void
do_atrchown(dbref player, const char *arg1, const char *arg2)
{
dbref thing, new_owner;
char *p;
ATTR *ptr;
if (!arg1 || !*arg1) {
notify(player, T("You need to give an object/attribute pair."));
return;
}
if (!(p = strchr(arg1, '/')) || !(*(p + 1))) {
notify(player, T("You need to give an object/attribute pair."));
return;
}
*p++ = '\0';
if ((thing = noisy_match_result(player, arg1, NOTYPE, MAT_EVERYTHING)) ==
NOTHING)
return;
if (!controls(player, thing)) {
notify(player, T("Permission denied."));
return;
}
if ((!arg2 && !*arg2) || !strcasecmp(arg2, "me"))
new_owner = player;
else
new_owner = lookup_player(arg2);
if (new_owner == NOTHING) {
notify(player, T("I can't find that player"));
return;
}
ptr = atr_get_noparent(thing, strupper(p));
if (ptr && Can_Read_Attr(player, thing, ptr)) {
if (Can_Write_Attr(player, thing, ptr)) {
if (new_owner != Owner(player) && !Wizard(player)) {
notify(player, T("You can only chown an attribute to yourself."));
return;
}
AL_CREATOR(ptr) = Owner(new_owner);
notify(player, T("Attribute owner changed."));
return;
} else {
notify(player, T("You don't have the permission to chown that."));
return;
}
} else
notify(player, T("No such attribute."));
}
/** Return the head of the attribute free list.
* This function returns the head of the attribute free list. If there
* are no more ATTR's on the free list, allocate a new page.
* \return the pointer to the head of the attribute free list.
*/
static ATTR *
get_atr_free_list(void)
{
if (!atr_free_list) {
ATTRPAGE *page;
int j;
page = (ATTRPAGE *) mush_malloc(sizeof(ATTRPAGE), "ATTRPAGE");
if (!page)
mush_panic("Couldn't allocate memory in get_atr_free_list");
for (j = 0; j < ATTRS_PER_PAGE - 1; j++)
AL_NEXT(page->atrs + j) = page->atrs + j + 1;
AL_NEXT(page->atrs + ATTRS_PER_PAGE - 1) = NULL;
atr_free_list = page->atrs;
}
return atr_free_list;
}
/** Return the compressed data for an attribute.
* This is a chokepoint function for accessing the chunk data.
* \param atr the attribute struct from which to get the data reference.
* \return a pointer to the compressed data, in a static buffer.
*/
unsigned char const *
atr_get_compressed_data(ATTR *atr)
{
static unsigned char buffer[BUFFER_LEN * 2];
unsigned int len;
if (!atr->data)
return (unsigned char *) "";
len = chunk_fetch(atr->data, buffer, sizeof(buffer));
if (len > sizeof(buffer))
return (unsigned char *) "";
buffer[len] = '\0';
return buffer;
}
/** Return the uncompressed data for an attribute in a static buffer.
* This is a wrapper function, to centralize the use of compression/
* decompression on attributes.
* \param atr the attribute struct from which to get the data reference.
* \return a pointer to the uncompressed data, in a static buffer.
*/
char *
atr_value(ATTR *atr)
{
return uncompress(atr_get_compressed_data(atr));
}
/** Return the uncompressed data for an attribute in a dynamic buffer.
* This is a wrapper function, to centralize the use of compression/
* decompression on attributes.
* \param atr the attribute struct from which to get the data reference.
* \return a pointer to the uncompressed data, in a dynamic buffer.
*/
char *
safe_atr_value(ATTR *atr)
{
return safe_uncompress(atr_get_compressed_data(atr));
}