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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* dirstack.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include "util.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;
}
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