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libisofs/src/node.c

200 lines
4.7 KiB

/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#include "libisofs.h"
#include "node.h"
#include "error.h"
#include <stdlib.h>
#include <string.h>
/**
* Increments the reference counting of the given node.
*/
void iso_node_ref(IsoNode *node)
{
++node->refcount;
}
/**
* Decrements the reference couting of the given node.
* If it reach 0, the node is free, and, if the node is a directory,
* its children will be unref() too.
*/
void iso_node_unref(IsoNode *node)
{
if (--node->refcount == 0) {
/* TODO #00002 handle deletion of each kind of node */
free(node->name);
free(node);
}
}
/**
* Set the name of a node.
*
* @param name The name in UTF-8 encoding
*/
void iso_node_set_name(IsoNode *node, const char *name)
{
free(node->name);
node->name = strdup(name);
}
/**
* Get the name of a node (in UTF-8).
* The returned string belongs to the node and should not be modified nor
* freed. Use strdup if you really need your own copy.
*/
const char *iso_node_get_name(const IsoNode *node)
{
return node->name;
}
/**
* Set the permissions for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*
* @param mode
* bitmask with the permissions of the node, as specified in 'man 2 stat'.
* The file type bitfields will be ignored, only file permissions will be
* modified.
*/
void iso_node_set_permissions(IsoNode *node, mode_t mode)
{
node->mode = (node->mode & S_IFMT) | (mode & ~S_IFMT);
}
/**
* Get the permissions for the node
*/
mode_t iso_node_get_permissions(const IsoNode *node)
{
return node->mode & ~S_IFMT;
}
/**
* Get the mode of the node, both permissions and file type, as specified in
* 'man 2 stat'.
*/
mode_t iso_node_get_mode(const IsoNode *node)
{
return node->mode;
}
/**
* Set the user id for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*/
void iso_node_set_uid(IsoNode *node, uid_t uid)
{
node->uid = uid;
}
/**
* Get the user id of the node.
*/
uid_t iso_node_get_uid(const IsoNode *node)
{
return node->uid;
}
/**
* Set the group id for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*/
void iso_node_set_gid(IsoNode *node, gid_t gid)
{
node->gid = gid;
}
/**
* Get the group id of the node.
*/
gid_t iso_node_get_gid(const IsoNode *node)
{
return node->gid;
}
/**
* Add a new node to a dir. Note that this function don't add a new ref to
* the node, so you don't need to free it, it will be automatically freed
* when the dir is deleted. Of course, if you want to keep using the node
* after the dir life, you need to iso_node_ref() it.
*
* @param dir
* the dir where to add the node
* @param child
* the node to add. You must ensure that the node hasn't previously added
* to other dir, and that the node name is unique inside the child.
* Otherwise this function will return a failure, and the child won't be
* inserted.
* @return
* number of nodes in dir if succes, < 0 otherwise
*/
int iso_dir_add_node(IsoDir *dir, IsoNode *child)
{
IsoNode **pos;
if (dir == NULL || child == NULL) {
return ISO_NULL_POINTER;
}
if ((IsoNode*)dir == child) {
return ISO_WRONG_ARG_VALUE;
}
if (child->parent != NULL) {
return ISO_NODE_ALREADY_ADDED;
}
pos = &(dir->children);
while (*pos != NULL && strcmp((*pos)->name, child->name) < 0) {
pos = &((*pos)->next);
}
if (*pos != NULL && !strcmp((*pos)->name, child->name)) {
return ISO_NODE_NAME_NOT_UNIQUE;
}
child->next = *pos;
*pos = child;
child->parent = dir;
return ++dir->nchildren;
}
/**
* Locate a node inside a given dir.
*
* @param name
* The name of the node
* @param node
* Location for a pointer to the node, it will filled with NULL if the dir
* doesn't have a child with the given name.
* @return
* 1 node found, 0 child has no such node, < 0 error
*/
int iso_dir_get_node(IsoDir *dir, const char *name, IsoNode **node)
{
IsoNode *pos;
if (dir == NULL || name == NULL || node == NULL) {
return ISO_NULL_POINTER;
}
pos = dir->children;
while (pos != NULL && strcmp(pos->name, name) < 0) {
pos = pos->next;
}
if (pos == NULL || strcmp(pos->name, name)) {
*node = NULL;
return 0; /* node not found */
}
*node = pos;
return 1;
}