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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* dir_tree_iterator.c
*
* Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util/dir_tree_iterator.h"
#include "util/util.h"
#include "sqfs/error.h"
#include <stdlib.h>
#include <string.h>
typedef struct dir_stack_t {
struct dir_stack_t *next;
dir_iterator_t *dir;
char name[];
} dir_stack_t;
typedef struct {
dir_iterator_t base;
int state;
dir_stack_t *top;
} dir_tree_iterator_t;
static void pop(dir_tree_iterator_t *it)
{
if (it->top != NULL) {
dir_stack_t *ent = it->top;
it->top = it->top->next;
sqfs_drop(ent->dir);
free(ent);
}
}
static int push(dir_tree_iterator_t *it, const char *name, dir_iterator_t *dir)
{
dir_stack_t *ent = alloc_flex(sizeof(*ent), 1, strlen(name) + 1);
if (ent == NULL)
return SQFS_ERROR_ALLOC;
strcpy(ent->name, name);
ent->dir = sqfs_grab(dir);
ent->next = it->top;
it->top = ent;
return 0;
}
/*****************************************************************************/
static void destroy(sqfs_object_t *obj)
{
dir_tree_iterator_t *it = (dir_tree_iterator_t *)obj;
while (it->top != NULL)
pop(it);
free(it);
}
static int next(dir_iterator_t *base, dir_entry_t **out)
{
dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
dir_iterator_t *sub = NULL;
dir_entry_t *ent = NULL;
dir_stack_t *sit = NULL;
size_t plen = 0;
int ret;
*out = NULL;
if (it->state != 0)
return it->state;
for (;;) {
if (it->top == NULL) {
ret = 1;
goto fail;
}
ret = it->top->dir->next(it->top->dir, &ent);
if (ret < 0)
goto fail;
if (ret > 0) {
pop(it);
continue;
}
if (!strcmp(ent->name, ".") || !strcmp(ent->name, "..")) {
free(ent);
ent = NULL;
continue;
}
break;
}
for (sit = it->top; sit != NULL; sit = sit->next) {
size_t len = strlen(sit->name);
if (len > 0)
plen += len + 1;
}
if (plen > 0) {
size_t slen = strlen(ent->name) + 1;
void *new = realloc(ent, sizeof(*ent) + plen + slen);
char *dst;
if (new == NULL) {
ret = SQFS_ERROR_ALLOC;
goto fail;
}
ent = new;
memmove(ent->name + plen, ent->name, slen);
dst = ent->name + plen;
for (sit = it->top; sit != NULL; sit = sit->next) {
size_t len = strlen(sit->name);
if (len > 0) {
*(--dst) = '/';
dst -= len;
memcpy(dst, sit->name, len);
}
}
}
if (S_ISDIR(ent->mode)) {
ret = it->top->dir->open_subdir(it->top->dir, &sub);
if (ret != 0)
goto fail;
ret = push(it, ent->name + plen, sub);
sqfs_drop(sub);
if (ret != 0)
goto fail;
}
*out = ent;
return it->state;
fail:
free(ent);
it->state = ret;
return it->state;
}
static int read_link(dir_iterator_t *base, char **out)
{
dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
if (it->top == NULL) {
*out = NULL;
return SQFS_ERROR_NO_ENTRY;
}
return it->top->dir->read_link(it->top->dir, out);
}
static int open_subdir(dir_iterator_t *base, dir_iterator_t **out)
{
dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
if (it->top == NULL) {
*out = NULL;
return SQFS_ERROR_NO_ENTRY;
}
return it->top->dir->open_subdir(it->top->dir, out);
}
dir_iterator_t *dir_tree_iterator_create(const char *path)
{
dir_tree_iterator_t *it = calloc(1, sizeof(*it));
dir_iterator_t *dir;
int ret;
if (it == NULL) {
perror(path);
return NULL;
}
dir = dir_iterator_create(path);
if (dir == NULL)
goto fail;
ret = push(it, "", dir);
dir = sqfs_drop(dir);
if (ret != 0) {
fprintf(stderr, "%s: out of memory\n", path);
goto fail;
}
sqfs_object_init(it, destroy, NULL);
((dir_iterator_t *)it)->dev = it->top->dir->dev;
((dir_iterator_t *)it)->next = next;
((dir_iterator_t *)it)->read_link = read_link;
((dir_iterator_t *)it)->open_subdir = open_subdir;
return (dir_iterator_t *)it;
fail:
free(it);
return NULL;
}
void dir_tree_iterator_skip(dir_iterator_t *base)
{
dir_tree_iterator_t *it = (dir_tree_iterator_t *)base;
pop(it);
}
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