getmntopts.c

   1 /*      $NetBSD: getmntopts.c,v 1.3 2003/08/07 16:44:58 agc 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 1.3 2003/08/07 16:44:58 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <fstab.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include <mntopts.h>
  50
  51 int getmnt_silent = 0;
  52
  53 static const char errmsg[] = "-o %s: option not supported";
  54
  55 struct mntoptparse {
  56         const char *options;
  57         const struct mntopt *mopts;
  58         char *optbuf;
  59         char **optarg;
  60 };
  61
  62 const char *
  63 getmntoptstr(mntoptparse_t mp, const char *opt)
  64 {
  65         const struct mntopt *m;
  66
  67         for (m = mp->mopts; m->m_option != NULL; m++)
  68                 if (strcasecmp(opt, m->m_option) == 0)
  69                         break;
  70
  71         if (m->m_option == NULL) {
  72                 if (getmnt_silent == 0)
  73                         errx(1, errmsg, opt);
  74                 else
  75                         return NULL;
  76         }
  77
  78         return mp->optarg[m - mp->mopts];
  79 }
  80
  81 long
  82 getmntoptnum(mntoptparse_t mp, const char *opt)
  83 {
  84         char *ep;
  85         long rv;
  86         void (*fun)(int, const char *, ...) = NULL;
  87         const char *val = getmntoptstr(mp, opt);
  88
  89         if (val == NULL) {
  90                 if (getmnt_silent == 0)
  91                         errx(1, "Missing %s argument", opt);
  92                 else
  93                         return -1;
  94         }
  95
  96         errno = 0;
  97         rv = strtol(val, &ep, 0);
  98
  99         if (*ep)
 100                 fun = errx;
 101
 102         if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
 103                 fun = err;
 104
 105         if (fun) {
 106                 if (getmnt_silent != 0)
 107                         return -1;
 108                 (*fun)(1, "Invalid %s argument `%s'", opt, val);
 109         }
 110         return rv;
 111 }
 112
 113 void
 114 freemntopts(mntoptparse_t mp)
 115 {
 116         free(mp->optbuf);
 117         free(mp->optarg);
 118         free(mp);
 119 }
 120
 121 mntoptparse_t
 122 getmntopts(const char *options, const struct mntopt *m0, int *flagp,
 123     int *altflagp)
 124 {
 125         const struct mntopt *m;
 126         int negative;
 127         char *opt, *p, *ctx = NULL;
 128         int *thisflagp;
 129         size_t nopts;
 130         mntoptparse_t mp;
 131
 132         for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
 133                 continue;
 134
 135         if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
 136                 return NULL;
 137
 138         /* Copy option string, since it is about to be torn asunder... */
 139         if ((mp->optbuf = strdup(options)) == NULL) {
 140                 free(mp);
 141                 return NULL;
 142         }
 143
 144         if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
 145                 free(mp->optbuf);
 146                 free(mp);
 147                 return NULL;
 148         }
 149
 150         mp->mopts = m0;
 151         mp->options = options;
 152
 153         for (opt = mp->optbuf; (opt = strtok_r(opt, ",", &ctx)) != NULL; opt = NULL) {
 154                 /* Check for "no" prefix. */
 155                 if (opt[0] == 'n' && opt[1] == 'o') {
 156                         negative = 1;
 157                         opt += 2;
 158                 } else
 159                         negative = 0;
 160
 161                 /*
 162                  * for options with assignments in them (ie. quotas)
 163                  * ignore the assignment as it's handled elsewhere
 164                  */
 165                 p = strchr(opt, '=');
 166                 if (p) {
 167                          *p++ = '\0';
 168                 }
 169
 170                 /* Scan option table. */
 171                 for (m = m0; m->m_option != NULL; ++m)
 172                         if (strcasecmp(opt, m->m_option) == 0)
 173                                 break;
 174
 175                 /* Save flag, or fail if option is not recognised. */
 176                 if (m->m_option) {
 177                         mp->optarg[m - m0] = p;
 178                         thisflagp = m->m_altloc ? altflagp : flagp;
 179                         if (negative == m->m_inverse)
 180                                 *thisflagp |= m->m_flag;
 181                         else
 182                                 *thisflagp &= ~m->m_flag;
 183                 } else if (!getmnt_silent) {
 184                         errx(1, errmsg, opt);
 185                 }
 186         }
 187         return mp;
 188 }