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/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * Redistributions of source code must retain the above copyright notice, this

 * list of conditions and the following disclaimer.

 *

 * 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.

 *

 * Neither the name of the original program's authors 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 OWNER 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.

 */

/* NOTE:

 * This is a bit of an ugly hack, working around the absence of fstat / etc.

 * As more stuff is completed and exposed in libc, this will improve */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <dirent.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <string.h>

#include "errors.h"

#include "config.h"

#include "util.h"

#include "entry.h"

#include "ls.h"

#include "cmds.h"

static char *cmdname = "ls";

static inline off_t flen(const char *f)

{

	int fd;

	off_t size;

	fd = open(f, O_RDONLY);

	if (fd == -1)

		return 0;

	size = lseek(fd, 0, SEEK_END);

	close(fd);

	if (size < 0)

		size = 0;

	return size;

}

static unsigned int ls_scope(const char *path)

{

	int fd;

	DIR *dirp;

	dirp = opendir(path);

	if (dirp) {

		closedir(dirp);

		return LS_DIR;

	}

	fd = open(path, O_RDONLY);

	if (fd > 0) {

		close(fd);

		return LS_FILE;

	}

	return LS_BOGUS;

}

static void ls_scan_dir(const char *d, DIR *dirp)

{

	struct dirent *dp;

	unsigned int scope;

	char *buff;

	if (! dirp)

		return;

	buff = (char *)malloc(PATH_MAX);

	if (NULL == buff) {

		cli_error(CL_ENOMEM, "ls: failed to scan %s", d);

		return;

	}

	while ((dp = readdir(dirp))) {

		memset(buff, 0, sizeof(buff));

		/* Don't worry if inserting a double slash, this will be fixed by

		 * absolutize() later with subsequent calls to open() or readdir() */

		snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);

		scope = ls_scope(buff);

		switch (scope) {

		case LS_DIR:

			ls_print_dir(dp->d_name);

			break;

		case LS_FILE:

			ls_print_file(dp->d_name, buff);

			break;

		case LS_BOGUS:

			/* Odd chance it was deleted from the time readdir() found

			 * it and the time that it was scoped */

			printf("ls: skipping bogus node %s\n", dp->d_name);

			break;

		}

	}

	free(buff);

	return;

}

/* ls_print_* currently does nothing more than print the entry.

 * in the future, we will likely pass the absolute path, and

 * some sort of ls_options structure that controls how each

 * entry is printed and what is printed about it.

 *

 * Now we just print basic DOS style lists */

static void ls_print_dir(const char *d)

{

	printf("%-40s\t<dir>\n", d);

	return;

}

static void ls_print_file(const char *name, const char *pathname)

{

	printf("%-40s\t%llu\n", name, (long long) flen(pathname));

	return;

}

void help_cmd_ls(unsigned int level)

{

	if (level == HELP_SHORT) {

		printf("`%s' lists files and directories.\n", cmdname);

	} else {

		help_cmd_ls(HELP_SHORT);

		printf("  `%s' [path], if no path is given the current "

				"working directory is used.\n", cmdname);

	}

	return;

}

int cmd_ls(char **argv)

{

	unsigned int argc;

	unsigned int scope;

	char *buff;

	DIR *dirp;

	argc = cli_count_args(argv);

	buff = (char *) malloc(PATH_MAX);

	if (NULL == buff) {

		cli_error(CL_ENOMEM, "%s: ", cmdname);

		return CMD_FAILURE;

	}

	memset(buff, 0, sizeof(buff));

	if (argc == 1)

		getcwd(buff, PATH_MAX);

	else

		strncpy(buff, argv[1], PATH_MAX);

	scope = ls_scope(buff);

	switch (scope) {

	case LS_BOGUS:

		cli_error(CL_ENOENT, buff);

		free(buff);

		return CMD_FAILURE;

	case LS_FILE:

		ls_print_file(buff, buff);

		break;

	case LS_DIR:

		dirp = opendir(buff);

		if (! dirp) {

			/* May have been deleted between scoping it and opening it */

			cli_error(CL_EFAIL, "Could not stat %s", buff);

			free(buff);

			return CMD_FAILURE;

		}

		ls_scan_dir(buff, dirp);

		closedir(dirp);

		break;

	}

	free(buff);

	return CMD_SUCCESS;

}