/*
 * $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);
}