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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)stat_flags.c     8.1 (Berkeley) 5/31/93
  30  * $FreeBSD: src/lib/libc/gen/strtofflags.c,v 1.18.2.1 2000/06/28 01:52:24 joe Exp $
  31  * $DragonFly: src/lib/libc/gen/strtofflags.c,v 1.5 2008/06/02 20:17:07 dillon Exp $
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36
  37 #include <stddef.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 static struct {
  43         const char *name;
  44         u_long flag;
  45         int invert;
  46 } mapping[] = {
  47         /* shorter names per flag first, all prefixed by "no" */
  48         { "nosappnd",           SF_APPEND,      0 },
  49         { "nosappend",          SF_APPEND,      0 },
  50         { "noarch",             SF_ARCHIVED,    0 },
  51         { "noarchived",         SF_ARCHIVED,    0 },
  52         { "noschg",             SF_IMMUTABLE,   0 },
  53         { "noschange",          SF_IMMUTABLE,   0 },
  54 #ifdef SF_NOHISTORY
  55         { "noshistory",         SF_NOHISTORY,   1 },
  56 #endif
  57         { "nosimmutable",       SF_IMMUTABLE,   0 },
  58         { "nosunlnk",           SF_NOUNLINK,    1 },
  59         { "nosunlink",          SF_NOUNLINK,    1 },
  60         { "nouappnd",           UF_APPEND,      0 },
  61         { "nouappend",          UF_APPEND,      0 },
  62         { "nouchg",             UF_IMMUTABLE,   0 },
  63         { "nouchange",          UF_IMMUTABLE,   0 },
  64         { "nouimmutable",       UF_IMMUTABLE,   0 },
  65         { "nodump",             UF_NODUMP,      1 },
  66         { "noopaque",           UF_OPAQUE,      0 },
  67 #ifdef UF_NOHISTORY
  68         { "nouhistory",         UF_NOHISTORY,   1 },
  69         { "nohistory",          UF_NOHISTORY,   1 },
  70 #endif
  71         { "nouunlnk",           UF_NOUNLINK,    1 },
  72         { "nouunlink",          UF_NOUNLINK,    1 },
  73 #ifdef UF_CACHE
  74         { "nocache",            UF_CACHE,       0 },
  75         { "noucache",           UF_CACHE,       0 },
  76         { "noscache",           SF_NOCACHE,     1 },
  77 #endif
  78 #ifdef UF_XLINK
  79         { "noxlink",            UF_XLINK,       0 },
  80         { "nouxlink",           UF_XLINK,       0 },
  81         { "nosxlink",           SF_XLINK,       0 },
  82 #endif
  83 };
  84 #define longestflaglen  12
  85 #define nmappings       (sizeof(mapping) / sizeof(mapping[0]))
  86
  87 /*
  88  * fflagstostr --
  89  *      Convert file flags to a comma-separated string.  If no flags
  90  *      are set, return the empty string.
  91  */
  92 char *
  93 fflagstostr(u_long flags)
  94 {
  95         char *string;
  96         const char *sp;
  97         char *dp;
  98         u_long setflags;
  99         u_int i;
 100
 101         if ((string = (char *)malloc(nmappings * (longestflaglen + 1))) == NULL)
 102                 return (NULL);
 103
 104         setflags = flags;
 105         dp = string;
 106         for (i = 0; i < nmappings; i++) {
 107                 if (setflags & mapping[i].flag) {
 108                         if (dp > string)
 109                                 *dp++ = ',';
 110                         for (sp = mapping[i].invert ? mapping[i].name :
 111                             mapping[i].name + 2; *sp; *dp++ = *sp++) ;
 112                         setflags &= ~mapping[i].flag;
 113                 }
 114         }
 115         *dp = '\0';
 116         return (string);
 117 }
 118
 119 /*
 120  * strtofflags --
 121  *      Take string of arguments and return file flags.  Return 0 on
 122  *      success, 1 on failure.  On failure, stringp is set to point
 123  *      to the offending token.
 124  */
 125 int
 126 strtofflags(char **stringp, u_long *setp, u_long *clrp)
 127 {
 128         char *string, *p;
 129         u_int i;
 130
 131         if (setp)
 132                 *setp = 0;
 133         if (clrp)
 134                 *clrp = 0;
 135         string = *stringp;
 136         while ((p = strsep(&string, "\t ,")) != NULL) {
 137                 *stringp = p;
 138                 if (*p == '\0')
 139                         continue;
 140                 for (i = 0; i < nmappings; i++) {
 141                         if (strcmp(p, mapping[i].name + 2) == 0) {
 142                                 if (mapping[i].invert) {
 143                                         if (clrp)
 144                                                 *clrp |= mapping[i].flag;
 145                                 } else {
 146                                         if (setp)
 147                                                 *setp |= mapping[i].flag;
 148                                 }
 149                                 break;
 150                         } else if (strcmp(p, mapping[i].name) == 0) {
 151                                 if (mapping[i].invert) {
 152                                         if (setp)
 153                                                 *setp |= mapping[i].flag;
 154                                 } else {
 155                                         if (clrp)
 156                                                 *clrp |= mapping[i].flag;
 157                                 }
 158                                 break;
 159                         }
 160                 }
 161                 if (i == nmappings)
 162                         return 1;
 163         }
 164         return 0;
 165 }