/*
 * $NetBSD: ls.c,v 1.3 1997/06/13 13:48:47 drochner Exp $
 */

/*
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1996
 *      Matthias Drochner.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#include <sys/cdefs.h>

#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>

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

#include "bootstrap.h"

static char typestr[] = "?fc?d?b? ?l?s?w";

static int      ls_getdir(char **pathp);

COMMAND_SET(ls, "ls", "list files", command_ls);

static int
command_ls(int argc, char *argv[])
{
        int             fd;
        struct stat     sb;
        struct          dirent *d;
        char            *buf, *path;
        char            lbuf[128];              /* one line */
        int             result, ch;
        int             verbose;

        result = CMD_OK;
        fd = -1;
        verbose = 0;
        optind = 1;
        optreset = 1;
        while ((ch = getopt(argc, argv, "l")) != -1) {
                switch (ch) {
                case 'l':
                        verbose = 1;
                        break;
                case '?':
                default:
                        /* getopt has already reported an error */
                        return (CMD_OK);
                }
        }
        argv += (optind - 1);
        argc -= (optind - 1);

        if (argc < 2) {
                path = "";
        } else {
                path = argv[1];
        }

        if (stat(path, &sb) == 0 && !S_ISDIR(sb.st_mode)) {
                if (verbose) {
                        printf(" %c %8d %s\n",
                            typestr[sb.st_mode >> 12],
                            (int)sb.st_size, path);
                } else {
                        printf(" %c  %s\n",
                            typestr[sb.st_mode >> 12], path);
                }
                return (CMD_OK);
        }

        fd = ls_getdir(&path);
        if (fd == -1) {
                result = CMD_ERROR;
                goto out;
        }
        pager_open();
        pager_output(path);
        pager_output("\n");

        while ((d = readdirfd(fd)) != NULL) {
                if (strcmp(d->d_name, ".") && strcmp(d->d_name, "..")) {
                        if (d->d_type == 0 || verbose) {
                                /* stat the file, if possible */
                                sb.st_size = 0;
                                sb.st_mode = 0;
                                /* Avoid double '/' */
                                if (strcmp(path, "/") == 0) {
                                        (void) asprintf(&buf, "/%s", d->d_name);
                                } else {
                                        (void) asprintf(&buf, "%s/%s", path,
                                            d->d_name);
                                }

                                if (buf != NULL) {
                                        /*
                                         * ignore return, could be symlink, etc.
                                         */
                                        if (stat(buf, &sb) != 0) {
                                                sb.st_size = 0;
                                                sb.st_mode = 0;
                                        }
                                        free(buf);
                                }
                        }
                        if (verbose) {
                                snprintf(lbuf, sizeof (lbuf), " %c %8d %s\n",
                                    typestr[d->d_type ?
                                    d->d_type:sb.st_mode >> 12],
                                    (int)sb.st_size, d->d_name);
                        } else {
                                snprintf(lbuf, sizeof (lbuf), " %c  %s\n",
                                    typestr[d->d_type ?
                                    d->d_type:sb.st_mode >> 12], d->d_name);
                        }
                        if (pager_output(lbuf))
                                goto out;
                }
        }
out:
        pager_close();
        if (fd != -1)
                close(fd);
        free(path);             /* ls_getdir() did allocate path */
        return (result);
}

/*
 * Given (path) containing a vaguely reasonable path specification, return an fd
 * on the directory, and an allocated copy of the path to the directory.
 */
static int
ls_getdir(char **pathp)
{
        struct stat     sb;
        int             fd;
        const char      *cp;
        char    *path;

        fd = -1;

        /* one extra byte for a possible trailing slash required */
        path = malloc(strlen(*pathp) + 2);
        if (path == NULL) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "out of memory");
                goto out;
        }

        strcpy(path, *pathp);

        /* Make sure the path is respectable to begin with */
        if (archsw.arch_getdev(NULL, path, &cp)) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "bad path '%s'", path);
                goto out;
        }

        /* If there's no path on the device, assume '/' */
        if (*cp == 0)
                strcat(path, "/");

        fd = open(path, O_RDONLY);
        if (fd < 0) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "open '%s' failed: %s", path, strerror(errno));
                goto out;
        }
        if (fstat(fd, &sb) < 0) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "stat failed: %s", strerror(errno));
                goto out;
        }
        if (!S_ISDIR(sb.st_mode)) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "%s: %s", path, strerror(ENOTDIR));
                goto out;
        }

        *pathp = path;
        return (fd);

out:
        free(path);
        *pathp = NULL;
        if (fd != -1)
                close(fd);
        return (-1);
}