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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "fstree.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
static tree_node_t *mknode(tree_node_t *parent, const char *name,
size_t name_len, size_t extra_len,
uint16_t mode, uint32_t uid, uint32_t gid)
{
size_t size = sizeof(tree_node_t) + extra_len;
tree_node_t *n;
switch (mode & S_IFMT) {
case S_IFDIR:
size += sizeof(*n->data.dir);
break;
case S_IFREG:
size += sizeof(*n->data.file);
break;
}
n = calloc(1, size + name_len + 1);
if (n == NULL)
return NULL;
if (parent != NULL) {
n->next = parent->data.dir->children;
parent->data.dir->children = n;
}
n->uid = uid;
n->gid = gid;
n->mode = mode;
switch (mode & S_IFMT) {
case S_IFDIR:
n->data.dir = (dir_info_t *)n->payload;
break;
case S_IFREG:
n->data.file = (file_info_t *)n->payload;
break;
case S_IFLNK:
n->data.slink_target = (char *)n->payload;
break;
}
n->name = (char *)n + size;
memcpy(n->name, name, name_len);
return n;
}
static void free_recursive(tree_node_t *n)
{
tree_node_t *it;
if (S_ISDIR(n->mode)) {
while (n->data.dir->children != NULL) {
it = n->data.dir->children;
n->data.dir->children = it->next;
free_recursive(it);
}
}
free(n);
}
static tree_node_t *child_by_name(tree_node_t *root, const char *name,
size_t len)
{
tree_node_t *n = root->data.dir->children;
while (n != NULL) {
if (strncmp(n->name, name, len) == 0 && n->name[len] == '\0')
break;
n = n->next;
}
return n;
}
static tree_node_t *get_parent_node(fstree_t *fs, tree_node_t *root,
const char *path)
{
const char *end;
tree_node_t *n;
for (;;) {
if (!S_ISDIR(root->mode)) {
errno = ENOTDIR;
return NULL;
}
end = strchr(path, '/');
if (end == NULL)
break;
n = child_by_name(root, path, end - path);
if (n == NULL) {
n = mknode(root, path, end - path, 0,
S_IFDIR | fs->default_mode,
fs->default_uid, fs->default_gid);
if (n == NULL)
return NULL;
n->data.dir->created_implicitly = true;
}
root = n;
path = end + 1;
}
return root;
}
tree_node_t *fstree_add(fstree_t *fs, const char *path, uint16_t mode,
uint32_t uid, uint32_t gid, size_t extra_len)
{
tree_node_t *child, *parent;
const char *name;
name = strrchr(path, '/');
name = (name == NULL ? path : (name + 1));
parent = get_parent_node(fs, fs->root, path);
if (parent == NULL)
return NULL;
child = child_by_name(parent, name, strlen(name));
if (child != NULL) {
if (S_ISDIR(child->mode) && S_ISDIR(mode) &&
child->data.dir->created_implicitly) {
child->data.dir->created_implicitly = false;
return child;
}
errno = EEXIST;
return NULL;
}
return mknode(parent, name, strlen(name), extra_len, mode, uid, gid);
}
tree_node_t *fstree_add_file(fstree_t *fs, const char *path, uint16_t mode,
uint32_t uid, uint32_t gid, uint64_t filesz,
const char *input)
{
tree_node_t *node;
size_t count, extra;
char *ptr;
count = filesz / fs->block_size;
extra = sizeof(uint32_t) * count + strlen(input) + 1;
mode &= 07777;
node = fstree_add(fs, path, S_IFREG | mode, uid, gid, extra);
if (node != NULL) {
ptr = (char *)(node->data.file->blocksizes + count);
strcpy(ptr, input);
node->data.file->input_file = ptr;
node->data.file->size = filesz;
}
return node;
}
int fstree_init(fstree_t *fs, size_t block_size, uint32_t mtime,
uint16_t default_mode, uint32_t default_uid,
uint32_t default_gid)
{
memset(fs, 0, sizeof(*fs));
fs->default_uid = default_uid;
fs->default_gid = default_gid;
fs->default_mode = default_mode & 07777;
fs->default_mtime = mtime;
fs->block_size = block_size;
fs->root = mknode(NULL, "", 0, 0, S_IFDIR | fs->default_mode,
default_uid, default_gid);
if (fs->root == NULL) {
perror("initializing file system tree");
return -1;
}
return 0;
}
void fstree_cleanup(fstree_t *fs)
{
free_recursive(fs->root);
memset(fs, 0, sizeof(*fs));
}
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