/*      $NetBSD: stat_flags.c,v 1.3 2022/04/19 20:32:17 rillig Exp $    */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  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. 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#else
#define HAVE_STRUCT_STAT_ST_FLAGS 1
#endif

#include <sys/cdefs.h>
#if !defined(lint)
#if 0
static char sccsid[] = "@(#)stat_flags.c        8.2 (Berkeley) 7/28/94";
#else
__RCSID("$NetBSD: stat_flags.c,v 1.3 2022/04/19 20:32:17 rillig Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <fts.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>

#include "util.h"

#define SAPPEND(s) do {                                                 \
        if (prefix != NULL)                                             \
                (void)strlcat(string, prefix, sizeof(string));          \
        (void)strlcat(string, s, sizeof(string));                       \
        prefix = ",";                                                   \
} while (0)

/*
 * flags_to_string --
 *      Convert stat flags to a comma-separated string.  If no flags
 *      are set, return the default string.
 */
char *
flags_to_string(u_long flags, const char *def)
{
        char string[128];
        const char *prefix;

        string[0] = '\0';
        prefix = NULL;
#if HAVE_STRUCT_STAT_ST_FLAGS
        if (flags & UF_APPEND)
                SAPPEND("uappnd");
        if (flags & UF_IMMUTABLE)
                SAPPEND("uchg");
        if (flags & UF_NODUMP)
                SAPPEND("nodump");
        if (flags & UF_OPAQUE)
                SAPPEND("opaque");
        if (flags & SF_APPEND)
                SAPPEND("sappnd");
        if (flags & SF_ARCHIVED)
                SAPPEND("arch");
        if (flags & SF_IMMUTABLE)
                SAPPEND("schg");
#ifdef SF_SNAPSHOT
        if (flags & SF_SNAPSHOT)
                SAPPEND("snap");
#endif
#endif
        if (prefix != NULL)
                return strdup(string);
        return strdup(def);
}

#define TEST(a, b, f) {                                                 \
        if (!strcmp(a, b)) {                                            \
                if (clear) {                                            \
                        if (clrp)                                       \
                                *clrp |= (f);                           \
                        if (setp)                                       \
                                *setp &= ~(f);                          \
                } else {                                                \
                        if (setp)                                       \
                                *setp |= (f);                           \
                        if (clrp)                                       \
                                *clrp &= ~(f);                          \
                }                                                       \
                break;                                                  \
        }                                                               \
}

/*
 * string_to_flags --
 *      Take string of arguments and return stat flags.  Return 0 on
 *      success, 1 on failure.  On failure, stringp is set to point
 *      to the offending token.
 */
int
string_to_flags(char **stringp, u_long *setp, u_long *clrp)
{
        int clear;
        char *string, *p;

        if (setp)
                *setp = 0;
        if (clrp)
                *clrp = 0;

#if HAVE_STRUCT_STAT_ST_FLAGS
        string = *stringp;
        while ((p = strsep(&string, "\t ,")) != NULL) {
                clear = 0;
                *stringp = p;
                if (*p == '\0')
                        continue;
                if (p[0] == 'n' && p[1] == 'o') {
                        clear = 1;
                        p += 2;
                }
                switch (p[0]) {
                case 'a':
                        TEST(p, "arch", SF_ARCHIVED);
                        TEST(p, "archived", SF_ARCHIVED);
                        return (1);
                case 'd':
                        clear = !clear;
                        TEST(p, "dump", UF_NODUMP);
                        return (1);
                case 'n':
                                /*
                                 * Support `nonodump'. Note that
                                 * the state of clear is not changed.
                                 */
                        TEST(p, "nodump", UF_NODUMP);
                        return (1);
                case 'o':
                        TEST(p, "opaque", UF_OPAQUE);
                        return (1);
                case 's':
                        TEST(p, "sappnd", SF_APPEND);
                        TEST(p, "sappend", SF_APPEND);
                        TEST(p, "schg", SF_IMMUTABLE);
                        TEST(p, "schange", SF_IMMUTABLE);
                        TEST(p, "simmutable", SF_IMMUTABLE);
                        return (1);
                case 'u':
                        TEST(p, "uappnd", UF_APPEND);
                        TEST(p, "uappend", UF_APPEND);
                        TEST(p, "uchg", UF_IMMUTABLE);
                        TEST(p, "uchange", UF_IMMUTABLE);
                        TEST(p, "uimmutable", UF_IMMUTABLE);
                        return (1);
                default:
                        return (1);
                }
        }
#endif

        return (0);
}