/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

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

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

#define longestflaglen  12
static struct {
        char name[longestflaglen + 1];
        char invert;
        u_long flag;
} const mapping[] = {
        /* shorter names per flag first, all prefixed by "no" */
        { "nosappnd",           0, SF_APPEND    },
        { "nosappend",          0, SF_APPEND    },
        { "noarch",             0, SF_ARCHIVED  },
        { "noarchived",         0, SF_ARCHIVED  },
        { "noschg",             0, SF_IMMUTABLE },
        { "noschange",          0, SF_IMMUTABLE },
        { "nosimmutable",       0, SF_IMMUTABLE },
        { "nosunlnk",           0, SF_NOUNLINK  },
        { "nosunlink",          0, SF_NOUNLINK  },
#ifdef SF_SNAPSHOT
        { "nosnapshot",         0, SF_SNAPSHOT  },
#endif
        { "nouappnd",           0, UF_APPEND    },
        { "nouappend",          0, UF_APPEND    },
        { "nouarch",            0, UF_ARCHIVE   },
        { "nouarchive",         0, UF_ARCHIVE   },
        { "nohidden",           0, UF_HIDDEN    },
        { "nouhidden",          0, UF_HIDDEN    },
        { "nouchg",             0, UF_IMMUTABLE },
        { "nouchange",          0, UF_IMMUTABLE },
        { "nouimmutable",       0, UF_IMMUTABLE },
        { "nodump",             1, UF_NODUMP    },
        { "nouunlnk",           0, UF_NOUNLINK  },
        { "nouunlink",          0, UF_NOUNLINK  },
        { "nooffline",          0, UF_OFFLINE   },
        { "nouoffline",         0, UF_OFFLINE   },
        { "noopaque",           0, UF_OPAQUE    },
        { "nordonly",           0, UF_READONLY  },
        { "nourdonly",          0, UF_READONLY  },
        { "noreadonly",         0, UF_READONLY  },
        { "noureadonly",        0, UF_READONLY  },
        { "noreparse",          0, UF_REPARSE   },
        { "noureparse",         0, UF_REPARSE   },
        { "nosparse",           0, UF_SPARSE    },
        { "nousparse",          0, UF_SPARSE    },
        { "nosystem",           0, UF_SYSTEM    },
        { "nousystem",          0, UF_SYSTEM    }
};
#define nmappings       (sizeof(mapping) / sizeof(mapping[0]))

/*
 * 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;
        const char *sp;
        char *dp;
        u_long setflags;
        u_int i;

        if ((string = (char *)malloc(nmappings * (longestflaglen + 1))) == NULL)
                return (NULL);

        setflags = flags;
        dp = string;
        for (i = 0; i < nmappings; i++) {
                if (setflags & mapping[i].flag) {
                        if (dp > string)
                                *dp++ = ',';
                        for (sp = mapping[i].invert ? mapping[i].name :
                            mapping[i].name + 2; *sp; *dp++ = *sp++) ;
                        setflags &= ~mapping[i].flag;
                }
        }
        *dp = '\0';
        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)
{
        char *string, *p;
        int i;

        if (setp)
                *setp = 0;
        if (clrp)
                *clrp = 0;
        string = *stringp;
        while ((p = strsep(&string, "\t ,")) != NULL) {
                *stringp = p;
                if (*p == '\0')
                        continue;
                for (i = 0; i < nmappings; i++) {
                        if (strcmp(p, mapping[i].name + 2) == 0) {
                                if (mapping[i].invert) {
                                        if (clrp)
                                                *clrp |= mapping[i].flag;
                                } else {
                                        if (setp)
                                                *setp |= mapping[i].flag;
                                }
                                break;
                        } else if (strcmp(p, mapping[i].name) == 0) {
                                if (mapping[i].invert) {
                                        if (setp)
                                                *setp |= mapping[i].flag;
                                } else {
                                        if (clrp)
                                                *clrp |= mapping[i].flag;
                                }
                                break;
                        }
                }
                if (i == nmappings)
                        return 1;
        }
        return 0;
}