lib/libutil/getmntopts.c

   1 /*      $NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $     */
   2
   3 /*-
   4  * Copyright (c) 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)getmntopts.c        8.3 (Berkeley) 3/29/95";
  36 #else
  37 __RCSID("$NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42 #include <sys/mount.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fstab.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 #include <mntopts.h>
  51
  52 int getmnt_silent = 0;
  53
  54 static const char errmsg[] = "-o %s: option not supported";
  55
  56 struct mntoptparse {
  57         const char *options;
  58         const struct mntopt *mopts;
  59         char *optbuf;
  60         char **optarg;
  61 };
  62
  63 const char *
  64 getmntoptstr(mntoptparse_t mp, const char *opt)
  65 {
  66         const struct mntopt *m;
  67
  68         for (m = mp->mopts; m->m_option != NULL; m++)
  69                 if (strcasecmp(opt, m->m_option) == 0)
  70                         break;
  71
  72         if (m->m_option == NULL) {
  73                 if (getmnt_silent == 0)
  74                         errx(1, errmsg, opt);
  75                 else
  76                         return NULL;
  77         }
  78
  79         return mp->optarg[m - mp->mopts];
  80 }
  81
  82 long
  83 getmntoptnum(mntoptparse_t mp, const char *opt)
  84 {
  85         char *ep;
  86         long rv;
  87         void (*fun)(int, const char *, ...) = NULL;
  88         const char *val = getmntoptstr(mp, opt);
  89
  90         if (val == NULL) {
  91                 if (getmnt_silent == 0)
  92                         errx(1, "Missing %s argument", opt);
  93                 else
  94                         return -1;
  95         }
  96
  97         errno = 0;
  98         rv = strtol(val, &ep, 0);
  99
 100         if (*ep)
 101                 fun = errx;
 102
 103         if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
 104                 fun = err;
 105
 106         if (fun) {
 107                 if (getmnt_silent != 0)
 108                         return -1;
 109                 (*fun)(1, "Invalid %s argument `%s'", opt, val);
 110         }
 111         return rv;
 112 }
 113
 114 void
 115 freemntopts(mntoptparse_t mp)
 116 {
 117         free(mp->optbuf);
 118         free(mp->optarg);
 119         free(mp);
 120 }
 121
 122 mntoptparse_t
 123 getmntopts(const char *options, const struct mntopt *m0, int *flagp,
 124     int *altflagp)
 125 {
 126         const struct mntopt *m;
 127         int negative;
 128         char *opt, *p;
 129         int *thisflagp;
 130         size_t nopts;
 131         mntoptparse_t mp;
 132
 133         for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
 134                 continue;
 135
 136         if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
 137                 return NULL;
 138
 139         /* Copy option string, since it is about to be torn asunder... */
 140         if ((mp->optbuf = strdup(options)) == NULL) {
 141                 free(mp);
 142                 return NULL;
 143         }
 144
 145         if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
 146                 free(mp->optbuf);
 147                 free(mp);
 148                 return NULL;
 149         }
 150
 151         mp->mopts = m0;
 152         mp->options = options;
 153
 154         for (opt = mp->optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
 155                 /* Check for "no" prefix. */
 156                 if (opt[0] == 'n' && opt[1] == 'o') {
 157                         negative = 1;
 158                         opt += 2;
 159                 } else
 160                         negative = 0;
 161
 162                 /*
 163                  * for options with assignments in them (ie. quotas)
 164                  * ignore the assignment as it's handled elsewhere
 165                  */
 166                 p = strchr(opt, '=');
 167                 if (p) {
 168                          *p++ = '\0';
 169                 }
 170
 171                 /* Scan option table. */
 172                 for (m = m0; m->m_option != NULL; ++m)
 173                         if (strcasecmp(opt, m->m_option) == 0)
 174                                 break;
 175
 176                 /* Save flag, or fail if option is not recognised. */
 177                 if (m->m_option) {
 178                         mp->optarg[m - m0] = p;
 179                         thisflagp = m->m_altloc ? altflagp : flagp;
 180                         if (negative == m->m_inverse)
 181                                 *thisflagp |= m->m_flag;
 182                         else
 183                                 *thisflagp &= ~m->m_flag;
 184                 } else if (!getmnt_silent) {
 185                         errx(1, errmsg, opt);
 186                 } else {
 187                         free(mp->optbuf);
 188                         free(mp);
 189
 190                         return NULL;
 191                 }
 192         }
 193         return mp;
 194 }