// SPDX-License-Identifier: GPL-2.0
#include "path.h"
#include "cache.h"
#include <linux/kernel.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>

static char *cleanup_path(char *path)
{
        /* Clean it up */
        if (!memcmp(path, "./", 2)) {
                path += 2;
                while (*path == '/')
                        path++;
        }
        return path;
}

char *mkpath(char *path_buf, size_t sz, const char *fmt, ...)
{
        va_list args;
        unsigned len;

        va_start(args, fmt);
        len = vsnprintf(path_buf, sz, fmt, args);
        va_end(args);
        if (len >= sz)
                strncpy(path_buf, "/bad-path/", sz);
        return cleanup_path(path_buf);
}

int path__join(char *bf, size_t size, const char *path1, const char *path2)
{
        return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
}

int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
{
        return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
                         path2, path2[0] ? "/" : "", path3);
}

bool is_regular_file(const char *file)
{
        struct stat st;

        if (stat(file, &st))
                return false;

        return S_ISREG(st.st_mode);
}

/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
bool is_directory(const char *base_path, const struct dirent *dent)
{
        char path[PATH_MAX];
        struct stat st;

        snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
        if (stat(path, &st))
                return false;

        return S_ISDIR(st.st_mode);
}

bool is_directory_at(int dir_fd, const char *path)
{
        struct stat st;

        if (fstatat(dir_fd, path, &st, /*flags=*/0))
                return false;

        return S_ISDIR(st.st_mode);
}