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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* fstree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "internal.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
enum {
DEF_UID = 0,
DEF_GID,
DEF_MODE,
DEF_MTIME,
};
static const char *defaults[] = {
[DEF_UID] = "uid",
[DEF_GID] = "gid",
[DEF_MODE] = "mode",
[DEF_MTIME] = "mtime",
NULL
};
static int process_defaults(struct stat *sb, char *subopts)
{
char *value;
long lval;
int i;
while (*subopts != '\0') {
i = getsubopt(&subopts, (char *const *)defaults, &value);
if (value == NULL) {
fprintf(stderr, "Missing value for option %s\n",
defaults[i]);
return -1;
}
switch (i) {
case DEF_UID:
lval = strtol(value, NULL, 0);
if (lval < 0)
goto fail_uv;
if (lval > (long)INT32_MAX)
goto fail_ov;
sb->st_uid = lval;
break;
case DEF_GID:
lval = strtol(value, NULL, 0);
if (lval < 0)
goto fail_uv;
if (lval > (long)INT32_MAX)
goto fail_ov;
sb->st_gid = lval;
break;
case DEF_MODE:
lval = strtol(value, NULL, 0);
if (lval < 0)
goto fail_uv;
if (lval > 07777)
goto fail_ov;
sb->st_mode = S_IFDIR | (sqfs_u16)lval;
break;
case DEF_MTIME:
lval = strtol(value, NULL, 0);
if (lval < 0)
goto fail_uv;
if (lval > (long)INT32_MAX)
goto fail_ov;
sb->st_mtime = lval;
break;
default:
fprintf(stderr, "Unknown option '%s'\n", value);
return -1;
}
}
return 0;
fail_uv:
fprintf(stderr, "%s: value must be positive\n", defaults[i]);
return -1;
fail_ov:
fprintf(stderr, "%s: value too large\n", defaults[i]);
return -1;
}
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);
}
int fstree_init(fstree_t *fs, char *defaults)
{
memset(fs, 0, sizeof(*fs));
fs->defaults.st_mode = S_IFDIR | 0755;
fs->defaults.st_blksize = 512;
fs->defaults.st_mtime = get_source_date_epoch();
if (defaults != NULL && process_defaults(&fs->defaults, defaults) != 0)
return -1;
fs->root = fstree_mknode(NULL, "", 0, NULL, &fs->defaults);
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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