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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* get_path.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
#include <string.h>
#include <stdlib.h>
int sqfs_tree_node_get_path(const sqfs_tree_node_t *node, char **out)
{
const sqfs_tree_node_t *it;
size_t clen, len = 0;
char *str, *ptr;
*out = NULL;
if (node == NULL)
return SQFS_ERROR_ARG_INVALID;
for (it = node; it->parent != NULL; it = it->parent) {
if (it->parent == node)
return SQFS_ERROR_LINK_LOOP;
/* non-root nodes must have a valid name */
clen = strlen((const char *)it->name);
if (clen == 0)
return SQFS_ERROR_CORRUPTED;
if (strchr((const char *)it->name, '/') != NULL)
return SQFS_ERROR_CORRUPTED;
if (it->name[0] == '.') {
if (clen == 1 || (clen == 2 && it->name[1] == '.'))
return SQFS_ERROR_CORRUPTED;
}
/* compute total path length */
if (SZ_ADD_OV(clen, 1, &clen))
return SQFS_ERROR_OVERFLOW;
if (SZ_ADD_OV(len, clen, &len))
return SQFS_ERROR_OVERFLOW;
}
/* root node must not have a name */
if (it->name[0] != '\0')
return SQFS_ERROR_ARG_INVALID;
/* generate the path */
if (node->parent == NULL) {
str = strdup("/");
if (str == NULL)
return SQFS_ERROR_ALLOC;
} else {
if (SZ_ADD_OV(len, 1, &len))
return SQFS_ERROR_OVERFLOW;
str = malloc(len);
if (str == NULL)
return SQFS_ERROR_ALLOC;
ptr = str + len - 1;
*ptr = '\0';
for (it = node; it->parent != NULL; it = it->parent) {
len = strlen((const char *)it->name);
ptr -= len;
memcpy(ptr, (const char *)it->name, len);
*(--ptr) = '/';
}
}
*out = str;
return 0;
}
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