/*
 * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $DragonFly: src/sys/boot/common/rel_open.c,v 1.2 2008/09/04 17:30:52 swildner Exp $
 */

#include <stand.h>
#include <string.h>

#include "bootstrap.h"

char *DirBase;

COMMAND_SET(cd, "cd", "Change directory", command_chdir);

static int
command_chdir(int ac, char **av)
{
        int result;

        if (ac == 1) {
                result = chdir(getenv("base"));
        } else if (ac == 2) {
                result = chdir(av[1]);
        } else {
                sprintf(command_errbuf, "usage: cd [<directory>]");
                result = CMD_ERROR;
        }
        return result;
}

COMMAND_SET(optcd, "optcd",
            "Change directory; ignore exit status", command_optchdir);

static int
command_optchdir(int ac, char **av)
{
        if (ac == 1) {
                chdir(getenv("base"));
        } else if (ac == 2) {
                chdir(av[1]);
        } else {
                sprintf(command_errbuf, "usage: optcd [<directory>]");
        }
        return(CMD_OK);
}

int
chdir(const char *path)
{
        struct stat st;
        char *base;
        char *p;
        char *b;
        char *s;
        char *w;
        int len;
        int dlen;
        int res;

        if (DirBase == NULL)
                DirBase = strdup("/");

        len = strlen(path);
        if (path[0] == '/') {
                base = malloc(len + 2);         /* room for trailing / */
                bcopy(path, base, len + 1);
        } else {
                while (len && path[len-1] == '/')
                        --len;
                dlen = strlen(DirBase);
                base = malloc(dlen + len + 2);  /* room for trailing / */
                bcopy(DirBase, base, dlen);
                bcopy(path, base + dlen, len);
                base[dlen + len] = 0;
        }

        if (stat(base, &st) == 0 && S_ISDIR(st.st_mode)) {
                p = b = w = s = base;
                while (*s) {
                        if (*s == '/') {
                                if (s - b == 2 && b[0] == '.' && b[1] == '.') {
                                        w = p;
                                } else {
                                        p = b;
                                        b = s + 1;
                                }
                                while (s[1] == '/')
                                        ++s;
                        }
                        *w = *s;
                        ++w;
                        ++s;
                }
                if (s - b == 2 && b[0] == '.' && b[1] == '.')
                        w = p;
                while (w > base && w[-1] == '/')
                        --w;
                *w++ = '/';
                *w = 0;

                if (DirBase)
                        free(DirBase);
                DirBase = base;
                res = CMD_OK;
        } else {
                free(base);
                sprintf(command_errbuf, "Unable to find directory");
                res = CMD_ERROR;
        }
        return (res);
}

COMMAND_SET(pwd, "pwd", "Get current directory", command_pwd);

static int
command_pwd(int ac, char **av)
{
        printf("%s\n", DirBase ? DirBase : "/");
        return(0);
}

int
rel_open(const char *path, char **abspathp, int flags)
{
        int fd;
        char *ptr;

        if (DirBase == NULL)
                DirBase = strdup("/");

        if (path[0] != '/') {
                ptr = malloc(strlen(DirBase) + strlen(path) + 1);
                sprintf(ptr, "%s%s", DirBase, path);
                fd = open(ptr, flags);
                if (abspathp && fd >= 0) {
                        *abspathp = ptr;
                } else if (abspathp) {
                        *abspathp = NULL;
                        free(ptr);
                } else {
                        free(ptr);
                }
        } else {
                fd = open(path, flags);
                if (abspathp && fd >= 0) {
                        *abspathp = strdup(path);
                } else if (abspathp) {
                        *abspathp = NULL;
                }
        }
        return(fd);
}

int
rel_stat(const char *path, struct stat *st)
{
        char *ptr;
        int res;

        if (DirBase == NULL)
                DirBase = strdup("/");

        if (path[0] != '/') {
                ptr = malloc(strlen(DirBase) + strlen(path) + 1);
                sprintf(ptr, "%s%s", DirBase, path);
                res = stat(ptr, st);
                free(ptr);
        } else {
                res = stat(path, st);
        }
        return(res);
}

/*
 * Return the root path of (path) with the "/boot" prefix prepended if
 * not present.  This is required by the kernel after bootstrap, e.g.,
 * kldstat(), preload_delete_name().
 */
char *
rel_rootpath(const char *path)
{
        char *rootpath;
        char *abspath;

        if (DirBase == NULL)
                DirBase = strdup("/");

        /*
         * Convert to absolute path first, because DirBase will be
         * "/boot/<kernelname>/" when /boot is on the root filesystem
         * instead of being a separate filesystem.
         */
        if (path[0] == '/') {
                abspath = strdup(path);
        } else {
                abspath = malloc(strlen(DirBase) + strlen(path) + 1);
                sprintf(abspath, "%s%s", DirBase, path);
        }

        if (strncmp(abspath, "/boot/", sizeof("/boot/")-1) == 0) {
                rootpath = abspath;
        } else {
                rootpath = malloc(strlen(abspath) + sizeof("/boot"));
                sprintf(rootpath, "/boot%s", abspath);
                free(abspath);
        }

        return (rootpath);
}