aboutsummaryrefslogtreecommitdiff
path: root/lib/common/dirstack.c
blob: f8d127874a8404603a2c20bed7f46b0bcb91741e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * dirstack.c
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#include "common.h"
#include "util/compat.h"

#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>

#define STACK_DEPTH 128

static int dirstack[STACK_DEPTH];
static int stacktop = 0;

int pushd(const char *path)
{
	int fd;

	assert(stacktop < STACK_DEPTH);

	fd = open(".", O_DIRECTORY | O_PATH | O_RDONLY | O_CLOEXEC);

	if (fd < 0) {
		perror("open ./");
		return -1;
	}

	if (chdir(path)) {
		perror(path);
		close(fd);
		return -1;
	}

	dirstack[stacktop++] = fd;
	return 0;
}

int pushdn(const char *path, size_t len)
{
	char *temp;
	int ret;

	temp = strndup(path, len);
	if (temp == NULL) {
		perror("pushd");
		return -1;
	}

	ret = pushd(temp);

	free(temp);
	return ret;
}

int popd(void)
{
	int fd;

	assert(stacktop > 0);

	fd = dirstack[stacktop - 1];

	if (fchdir(fd)) {
		perror("popd");
		return -1;
	}

	--stacktop;
	close(fd);
	return 0;
}