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// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
/*
* Created by Li Guifu <bluce.lee@aliyun.com>
*/
#include <string.h>
#include <stdlib.h>
#include "erofs/err.h"
#include "erofs/list.h"
#include "erofs/print.h"
#include "erofs/exclude.h"
#include "erofs/internal.h"
#define EXCLUDE_RULE_EXACT_SIZE offsetof(struct erofs_exclude_rule, reg)
#define EXCLUDE_RULE_REGEX_SIZE sizeof(struct erofs_exclude_rule)
static LIST_HEAD(exclude_head);
static LIST_HEAD(regex_exclude_head);
static void dump_regerror(int errcode, const char *s, const regex_t *preg)
{
char str[512];
regerror(errcode, preg, str, sizeof(str));
erofs_err("invalid regex %s (%s)\n", s, str);
}
static struct erofs_exclude_rule *erofs_insert_exclude(const char *s,
bool is_regex)
{
struct erofs_exclude_rule *r;
int ret;
struct list_head *h;
r = malloc(is_regex ? EXCLUDE_RULE_REGEX_SIZE :
EXCLUDE_RULE_EXACT_SIZE);
if (!r)
return ERR_PTR(-ENOMEM);
r->pattern = strdup(s);
if (!r->pattern) {
ret = -ENOMEM;
goto err_rule;
}
if (is_regex) {
ret = regcomp(&r->reg, s, REG_EXTENDED|REG_NOSUB);
if (ret) {
dump_regerror(ret, s, &r->reg);
goto err_rule;
}
h = ®ex_exclude_head;
} else {
h = &exclude_head;
}
list_add_tail(&r->list, h);
erofs_info("insert exclude %s: %s\n",
is_regex ? "regex" : "path", s);
return r;
err_rule:
if (r->pattern)
free(r->pattern);
free(r);
return ERR_PTR(ret);
}
void erofs_cleanup_exclude_rules(void)
{
struct erofs_exclude_rule *r, *n;
struct list_head *h;
h = &exclude_head;
list_for_each_entry_safe(r, n, h, list) {
list_del(&r->list);
free(r->pattern);
free(r);
}
h = ®ex_exclude_head;
list_for_each_entry_safe(r, n, h, list) {
list_del(&r->list);
free(r->pattern);
regfree(&r->reg);
free(r);
}
}
int erofs_parse_exclude_path(const char *args, bool is_regex)
{
struct erofs_exclude_rule *r = erofs_insert_exclude(args, is_regex);
if (IS_ERR(r)) {
erofs_cleanup_exclude_rules();
return PTR_ERR(r);
}
return 0;
}
struct erofs_exclude_rule *erofs_is_exclude_path(const char *dir,
const char *name)
{
char buf[PATH_MAX];
const char *s;
struct erofs_exclude_rule *r;
if (!dir) {
/* no prefix */
s = name;
} else {
sprintf(buf, "%s/%s", dir, name);
s = buf;
}
s = erofs_fspath(s);
list_for_each_entry(r, &exclude_head, list) {
if (!strcmp(r->pattern, s))
return r;
}
list_for_each_entry(r, ®ex_exclude_head, list) {
int ret = regexec(&r->reg, s, (size_t)0, NULL, 0);
if (!ret)
return r;
if (ret != REG_NOMATCH)
dump_regerror(ret, s, &r->reg);
}
return NULL;
}
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