/*      $NetBSD$        */

/*-
* 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.
*
* @(#)stat_flags.c     8.1 (Berkeley) 5/31/93
* $FreeBSD: src/lib/libc/gen/strtofflags.c,v 1.18.2.1 2000/06/28 01:52:24 joe Exp $
* $DragonFly: src/lib/libc/gen/strtofflags.c,v 1.5 2008/06/02 20:17:07 dillon Exp $
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD$");
#endif

#include <sys/types.h>
#include <sys/stat.h>

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static struct {
       char *name;
       u_long flag;
       int invert;
} mapping[] = {
       /* shorter names per flag first, all prefixed by "no" */
#ifdef SF_APPEND
       { "nosappnd",           SF_APPEND,      0 },
       { "nosappend",          SF_APPEND,      0 },
#endif
#ifdef SF_ARCHIVED
       { "noarch",             SF_ARCHIVED,    0 },
       { "noarchived",         SF_ARCHIVED,    0 },
#endif
#ifdef SF_IMMUTABLE
       { "noschg",             SF_IMMUTABLE,   0 },
       { "noschange",          SF_IMMUTABLE,   0 },
       { "nosimmutable",       SF_IMMUTABLE,   0 },
#endif
#ifdef SF_NOHISTORY
       { "noshistory",         SF_NOHISTORY,   1 },
#endif
#ifdef SF_NOUNLINK
       { "nosunlnk",           SF_NOUNLINK,    1 },
       { "nosunlink",          SF_NOUNLINK,    1 },
#endif
#ifdef UF_APPEND
       { "nouappnd",           UF_APPEND,      0 },
       { "nouappend",          UF_APPEND,      0 },
#endif
#ifdef UF_IMMUTABLE
       { "nouchg",             UF_IMMUTABLE,   0 },
       { "nouchange",          UF_IMMUTABLE,   0 },
       { "nouimmutable",       UF_IMMUTABLE,   0 },
#endif
#ifdef UF_NODUMP
       { "nodump",             UF_NODUMP,      1 },
#endif
#ifdef UF_OPAQUE
       { "noopaque",           UF_OPAQUE,      0 },
#endif
#ifdef UF_NOHISTORY
       { "nouhistory",         UF_NOHISTORY,   1 },
       { "nohistory",          UF_NOHISTORY,   1 },
#endif
#ifdef UF_NOUNLINK
       { "nouunlnk",           UF_NOUNLINK,    1 },
       { "nouunlink",          UF_NOUNLINK,    1 },
#endif
};

#define MAXFLAGLEN      12
#define NMAPPING        __arraycount(mapping)

/*
* fflagstostr --
*      Convert file flags to a comma-separated string.  If no flags
*      are set, return the empty string.
*/
char *
fflagstostr(u_long flags)
{
       char *string;
       char *sp, *dp;
       u_long setflags;
       int i;

       string = malloc(NMAPPING * (MAXFLAGLEN + 1));
       if (string == NULL)
               goto out;

       setflags = flags;
       dp = string;
       for (i = 0; i < NMAPPING; i++) {
               if ((setflags & mapping[i].flag) == 0)
                       continue;

               if (dp > string)
                       *dp++ = ',';

               sp = mapping[i].name;
               if (mapping[i].invert)
                       sp += 2;

               while (*sp != '\0')
                       *dp++ = *sp++;

               setflags &= ~mapping[i].flag;
       }
       *dp = '\0';

out:
       return string;
}

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

       setf = 0;
       clrf = 0;

       string = *stringp;

       while ((p = strsep(&string, "\t ,")) != NULL) {
               int p_off = 0;

               *stringp = p;
               if (*p == '\0')
                       continue;

               if (strcmp(p, "no") == 0)
                       p_off = 2;

               for (i = 0; i < NMAPPING; i++) {
                       if (strcmp(p, mapping[i].name + p_off) != 0)
                               continue;

                       if (mapping[i].invert)
                               clrf |= mapping[i].flag;
                       else
                               setf |= mapping[i].flag;
               }

               if (i == NMAPPING)
                       return 1;
       }

       if (setp != NULL)
               *setp = setf;

       if (clrp != NULL)
               *clrp = clrf;

       return 0;
}