lib/libc/gen/strtofflags.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)stat_flags.c     8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/lib/libc/gen/strtofflags.c,v 1.18.2.1 2000/06/28 01:52:24 joe Exp $
  35  * $DragonFly: src/lib/libc/gen/strtofflags.c,v 1.5 2008/06/02 20:17:07 dillon Exp $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40
  41 #include <stddef.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 static struct {
  47         const char *name;
  48         u_long flag;
  49         int invert;
  50 } mapping[] = {
  51         /* shorter names per flag first, all prefixed by "no" */
  52         { "nosappnd",           SF_APPEND,      0 },
  53         { "nosappend",          SF_APPEND,      0 },
  54         { "noarch",             SF_ARCHIVED,    0 },
  55         { "noarchived",         SF_ARCHIVED,    0 },
  56         { "noschg",             SF_IMMUTABLE,   0 },
  57         { "noschange",          SF_IMMUTABLE,   0 },
  58 #ifdef SF_NOHISTORY
  59         { "noshistory",         SF_NOHISTORY,   1 },
  60 #endif
  61         { "nosimmutable",       SF_IMMUTABLE,   0 },
  62         { "nosunlnk",           SF_NOUNLINK,    1 },
  63         { "nosunlink",          SF_NOUNLINK,    1 },
  64         { "nouappnd",           UF_APPEND,      0 },
  65         { "nouappend",          UF_APPEND,      0 },
  66         { "nouchg",             UF_IMMUTABLE,   0 },
  67         { "nouchange",          UF_IMMUTABLE,   0 },
  68         { "nouimmutable",       UF_IMMUTABLE,   0 },
  69         { "nodump",             UF_NODUMP,      1 },
  70         { "noopaque",           UF_OPAQUE,      0 },
  71 #ifdef UF_NOHISTORY
  72         { "nouhistory",         UF_NOHISTORY,   1 },
  73         { "nohistory",          UF_NOHISTORY,   1 },
  74 #endif
  75         { "nouunlnk",           UF_NOUNLINK,    1 },
  76         { "nouunlink",          UF_NOUNLINK,    1 }
  77 };
  78 #define longestflaglen  12
  79 #define nmappings       (sizeof(mapping) / sizeof(mapping[0]))
  80
  81 /*
  82  * fflagstostr --
  83  *      Convert file flags to a comma-separated string.  If no flags
  84  *      are set, return the empty string.
  85  */
  86 char *
  87 fflagstostr(u_long flags)
  88 {
  89         char *string;
  90         const char *sp;
  91         char *dp;
  92         u_long setflags;
  93         u_int i;
  94
  95         if ((string = (char *)malloc(nmappings * (longestflaglen + 1))) == NULL)
  96                 return (NULL);
  97
  98         setflags = flags;
  99         dp = string;
 100         for (i = 0; i < nmappings; i++) {
 101                 if (setflags & mapping[i].flag) {
 102                         if (dp > string)
 103                                 *dp++ = ',';
 104                         for (sp = mapping[i].invert ? mapping[i].name :
 105                             mapping[i].name + 2; *sp; *dp++ = *sp++) ;
 106                         setflags &= ~mapping[i].flag;
 107                 }
 108         }
 109         *dp = '\0';
 110         return (string);
 111 }
 112
 113 /*
 114  * strtofflags --
 115  *      Take string of arguments and return file flags.  Return 0 on
 116  *      success, 1 on failure.  On failure, stringp is set to point
 117  *      to the offending token.
 118  */
 119 int
 120 strtofflags(char **stringp, u_long *setp, u_long *clrp)
 121 {
 122         char *string, *p;
 123         u_int i;
 124
 125         if (setp)
 126                 *setp = 0;
 127         if (clrp)
 128                 *clrp = 0;
 129         string = *stringp;
 130         while ((p = strsep(&string, "\t ,")) != NULL) {
 131                 *stringp = p;
 132                 if (*p == '\0')
 133                         continue;
 134                 for (i = 0; i < nmappings; i++) {
 135                         if (strcmp(p, mapping[i].name + 2) == 0) {
 136                                 if (mapping[i].invert) {
 137                                         if (clrp)
 138                                                 *clrp |= mapping[i].flag;
 139                                 } else {
 140                                         if (setp)
 141                                                 *setp |= mapping[i].flag;
 142                                 }
 143                                 break;
 144                         } else if (strcmp(p, mapping[i].name) == 0) {
 145                                 if (mapping[i].invert) {
 146                                         if (setp)
 147                                                 *setp |= mapping[i].flag;
 148                                 } else {
 149                                         if (clrp)
 150                                                 *clrp |= mapping[i].flag;
 151                                 }
 152                                 break;
 153                         }
 154                 }
 155                 if (i == nmappings)
 156                         return 1;
 157         }
 158         return 0;
 159 }