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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* get_path.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include "util.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
char *fstree_get_path(tree_node_t *node)
{
tree_node_t *it;
char *str, *ptr;
size_t len = 0;
if (node->parent == NULL)
return strdup("/");
for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
if (SZ_ADD_OV(len, strlen(it->name), &len) ||
SZ_ADD_OV(len, 1, &len))
goto fail_ov;
}
if (SZ_ADD_OV(len, 1, &len))
goto fail_ov;
str = malloc(len);
if (str == NULL)
return NULL;
ptr = str + len - 1;
*ptr = '\0';
for (it = node; it != NULL && it->parent != NULL; it = it->parent) {
len = strlen(it->name);
ptr -= len;
memcpy(ptr, it->name, len);
*(--ptr) = '/';
}
return str;
fail_ov:
errno = EOVERFLOW;
return NULL;
}
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