/* vi: set sw=4 ts=4: */
/*
 * Mini find implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Reworked by David Douthitt <n9ubh@callsign.net> and
 *  Matt Kraai <kraai@alumni.carnegiemellon.edu>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <fnmatch.h>
#include <time.h>
#include <ctype.h>
#include "busybox.h"

//XXX just found out about libbb/messages.c . maybe move stuff there ? - ghoz
const char msg_req_arg[] = "option `%s' requires an argument";
const char msg_invalid_arg[] = "invalid argument `%s' to `%s'";

static char *pattern;

#ifdef CONFIG_FEATURE_FIND_TYPE
static int type_mask = 0;
#endif

#ifdef CONFIG_FEATURE_FIND_PERM
static char perm_char = 0;
static int perm_mask = 0;
#endif

#ifdef CONFIG_FEATURE_FIND_MTIME
static char mtime_char;
static int mtime_days;
#endif

#ifdef CONFIG_FEATURE_FIND_XDEV
static dev_t *xdev_dev;
static int xdev_count = 0;
#endif

#ifdef CONFIG_FEATURE_FIND_NEWER
time_t newer_mtime;
#endif

#ifdef CONFIG_FEATURE_FIND_INUM
static ino_t inode_num;
#endif

static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
{
	if (pattern != NULL) {
		const char *tmp = strrchr(fileName, '/');

		if (tmp == NULL)
			tmp = fileName;
		else
			tmp++;
		if (!(fnmatch(pattern, tmp, FNM_PERIOD) == 0))
			goto no_match;
	}
#ifdef CONFIG_FEATURE_FIND_TYPE
	if (type_mask != 0) {
		if (!((statbuf->st_mode & S_IFMT) == type_mask))
			goto no_match;
	}
#endif
#ifdef CONFIG_FEATURE_FIND_PERM
	if (perm_mask != 0) {
		if (!((isdigit(perm_char) && (statbuf->st_mode & 07777) == perm_mask) ||
			 (perm_char == '-' && (statbuf->st_mode & perm_mask) == perm_mask) ||
			 (perm_char == '+' && (statbuf->st_mode & perm_mask) != 0)))
			goto no_match;
	}
#endif
#ifdef CONFIG_FEATURE_FIND_MTIME
	if (mtime_char != 0) {
		time_t file_age = time(NULL) - statbuf->st_mtime;
		time_t mtime_secs = mtime_days * 24 * 60 * 60;
		if (!((isdigit(mtime_char) && file_age >= mtime_secs &&
						file_age < mtime_secs + 24 * 60 * 60) ||
				(mtime_char == '+' && file_age >= mtime_secs + 24 * 60 * 60) ||
				(mtime_char == '-' && file_age < mtime_secs)))
			goto no_match;
	}
#endif
#ifdef CONFIG_FEATURE_FIND_XDEV
	if (xdev_count) {
		int i;
		for (i=0; i<xdev_count; i++) {
			if (xdev_dev[i] == statbuf-> st_dev)
				break;
		}
		if (i == xdev_count) {
			if(S_ISDIR(statbuf->st_mode))
				return SKIP;
			else
				goto no_match;
		}
	}
#endif
#ifdef CONFIG_FEATURE_FIND_NEWER
	if (newer_mtime != 0) {
		time_t file_age = newer_mtime - statbuf->st_mtime;
		if (file_age >= 0)
			goto no_match;
	}
#endif
#ifdef CONFIG_FEATURE_FIND_INUM
	if (inode_num != 0) {
		if (!(statbuf->st_ino == inode_num))
			goto no_match;
	}
#endif
	puts(fileName);
no_match:
	return (TRUE);
}

#ifdef CONFIG_FEATURE_FIND_TYPE
static int find_type(char *type)
{
	int mask = 0;

	switch (type[0]) {
		case 'b':
			mask = S_IFBLK;
			break;
		case 'c':
			mask = S_IFCHR;
			break;
		case 'd':
			mask = S_IFDIR;
			break;
		case 'p':
			mask = S_IFIFO;
			break;
		case 'f':
			mask = S_IFREG;
			break;
		case 'l':
			mask = S_IFLNK;
			break;
		case 's':
			mask = S_IFSOCK;
			break;
	}

	if (mask == 0 || type[1] != '\0')
		bb_error_msg_and_die(msg_invalid_arg, type, "-type");

	return mask;
}
#endif

int find_main(int argc, char **argv)
{
	int dereference = FALSE;
	int i, firstopt, status = EXIT_SUCCESS;

	for (firstopt = 1; firstopt < argc; firstopt++) {
		if (argv[firstopt][0] == '-')
			break;
	}

	/* Parse any options */
	for (i = firstopt; i < argc; i++) {
		if (strcmp(argv[i], "-follow") == 0)
			dereference = TRUE;
		else if (strcmp(argv[i], "-print") == 0) {
			;
			}
		else if (strcmp(argv[i], "-name") == 0) {
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-name");
			pattern = argv[i];
#ifdef CONFIG_FEATURE_FIND_TYPE
		} else if (strcmp(argv[i], "-type") == 0) {
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-type");
			type_mask = find_type(argv[i]);
#endif
#ifdef CONFIG_FEATURE_FIND_PERM
		} else if (strcmp(argv[i], "-perm") == 0) {
			char *end;
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-perm");
			perm_mask = strtol(argv[i], &end, 8);
			if ((end[0] != '\0') || (perm_mask > 07777))
				bb_error_msg_and_die(msg_invalid_arg, argv[i], "-perm");
			if ((perm_char = argv[i][0]) == '-')
				perm_mask = -perm_mask;
#endif
#ifdef CONFIG_FEATURE_FIND_MTIME
		} else if (strcmp(argv[i], "-mtime") == 0) {
			char *end;
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-mtime");
			mtime_days = strtol(argv[i], &end, 10);
			if (end[0] != '\0')
				bb_error_msg_and_die(msg_invalid_arg, argv[i], "-mtime");
			if ((mtime_char = argv[i][0]) == '-')
				mtime_days = -mtime_days;
#endif
#ifdef CONFIG_FEATURE_FIND_XDEV
		} else if (strcmp(argv[i], "-xdev") == 0) {
			struct stat stbuf;

			xdev_count = ( firstopt - 1 ) ? ( firstopt - 1 ) : 1;
			xdev_dev = xmalloc ( xdev_count * sizeof( dev_t ));

			if ( firstopt == 1 ) {
				if ( stat ( ".", &stbuf ) < 0 )
					bb_error_msg_and_die("could not stat '.'" );
				xdev_dev [0] = stbuf. st_dev;
			}
			else {

				for (i = 1; i < firstopt; i++) {
					if ( stat ( argv [i], &stbuf ) < 0 )
						bb_error_msg_and_die("could not stat '%s'", argv [i] );
					xdev_dev [i-1] = stbuf. st_dev;
				}
			}
#endif
#ifdef CONFIG_FEATURE_FIND_NEWER
		} else if (strcmp(argv[i], "-newer") == 0) {
			struct stat stat_newer;
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-newer");
		    if (stat (argv[i], &stat_newer) != 0)
				bb_error_msg_and_die("file %s not found", argv[i]);
			newer_mtime = stat_newer.st_mtime;
#endif
#ifdef CONFIG_FEATURE_FIND_INUM
		} else if (strcmp(argv[i], "-inum") == 0) {
			char *end;
			if (++i == argc)
				bb_error_msg_and_die(msg_req_arg, "-inum");
			inode_num = strtol(argv[i], &end, 10);
			if (end[0] != '\0')
				bb_error_msg_and_die(msg_invalid_arg, argv[i], "-inum");
#endif
		} else
			bb_show_usage();
	}

	if (firstopt == 1) {
		if (! recursive_action(".", TRUE, dereference, FALSE, fileAction,
					fileAction, NULL))
			status = EXIT_FAILURE;
	} else {
		for (i = 1; i < firstopt; i++) {
			if (! recursive_action(argv[i], TRUE, dereference, FALSE, fileAction,
						fileAction, NULL))
				status = EXIT_FAILURE;
		}
	}

	return status;
}