permstring.c

来自「Rsync 3.0.5 source code」· C语言 代码 · 共 66 行

/*
 * A single utility routine.
 *
 * Copyright (C) 1996 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2001 Martin Pool <[e-mail]>
 * Copyright (C) 2003, 2006 Wayne Davison
 *
 * 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 3 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, visit the http://fsf.org website.
 */

#include "rsync.h"

/* Produce a string representation of Unix mode bits like that used by ls(1).
 * The "buf" buffer must be at least 11 characters. */
void permstring(char *perms, mode_t mode)
{
	static const char *perm_map = "rwxrwxrwx";
	int i;

	strlcpy(perms, "----------", 11);

	for (i = 0; i < 9; i++) {
		if (mode & (1 << i))
			perms[9-i] = perm_map[8-i];
	}

	/* Handle setuid/sticky bits.  You might think the indices are
	 * off by one, but remember there's a type char at the
	 * start.  */
	if (mode & S_ISUID)
		perms[3] = (mode & S_IXUSR) ? 's' : 'S';

	if (mode & S_ISGID)
		perms[6] = (mode & S_IXGRP) ? 's' : 'S';

#ifdef S_ISVTX
	if (mode & S_ISVTX)
		perms[9] = (mode & S_IXOTH) ? 't' : 'T';
#endif

	if (S_ISDIR(mode))
		perms[0] = 'd';
	else if (S_ISLNK(mode))
		perms[0] = 'l';
	else if (S_ISBLK(mode))
		perms[0] = 'b';
	else if (S_ISCHR(mode))
		perms[0] = 'c';
	else if (S_ISSOCK(mode))
		perms[0] = 's';
	else if (S_ISFIFO(mode))
		perms[0] = 'p';
}