sbin/mount/getmntopts.c

   1 /*-
   2  * Copyright (c) 1994
   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  * @(#)getmntopts.c     8.3 (Berkeley) 3/29/95
  34  * $FreeBSD: src/sbin/mount/getmntopts.c,v 1.9 1999/10/09 11:54:06 phk Exp $
  35  * $DragonFly: src/sbin/mount/getmntopts.c,v 1.4 2004/09/06 01:19:07 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <sysexits.h>
  46
  47 #include "mntopts.h"
  48
  49 int getmnt_silent = 0;
  50
  51 void
  52 getmntopts(const char *options, const struct mntopt *m0, int *flagp,
  53            int *altflagp)
  54 {
  55         const struct mntopt *m;
  56         int negative;
  57         char *opt, *optbuf, *p;
  58         int *thisflagp;
  59
  60         /* Copy option string, since it is about to be torn asunder... */
  61         if ((optbuf = strdup(options)) == NULL)
  62                 err(1, NULL);
  63
  64         for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
  65                 /* Check for "no" prefix. */
  66                 if (opt[0] == 'n' && opt[1] == 'o') {
  67                         negative = 1;
  68                         opt += 2;
  69                 } else
  70                         negative = 0;
  71
  72                 /*
  73                  * for options with assignments in them (ie. quotas)
  74                  * ignore the assignment as it's handled elsewhere
  75                  */
  76                 p = strchr(opt, '=');
  77                 if (p)
  78                          *++p = '\0';
  79
  80                 /* Scan option table. */
  81                 for (m = m0; m->m_option != NULL; ++m) {
  82                         if (strcasecmp(opt, m->m_option) == 0)
  83                                 break;
  84                 }
  85
  86                 /* Save flag, or fail if option is not recognized. */
  87                 if (m->m_option) {
  88                         thisflagp = m->m_altloc ? altflagp : flagp;
  89                         if (negative == m->m_inverse)
  90                                 *thisflagp |= m->m_flag;
  91                         else
  92                                 *thisflagp &= ~m->m_flag;
  93                 } else if (!getmnt_silent) {
  94                         errx(1, "-o %s: option not supported", opt);
  95                 }
  96         }
  97
  98         free(optbuf);
  99 }
 100
 101 void
 102 rmslashes(char *rrpin, char *rrpout)
 103 {
 104         char *rrpoutstart;
 105
 106         *rrpout = *rrpin;
 107         for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
 108
 109                 /* skip all double slashes */
 110                 while (*rrpin == '/' && *(rrpin + 1) == '/')
 111                          rrpin++;
 112         }
 113
 114         /* remove trailing slash if necessary */
 115         if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
 116                 *(rrpout - 1) = '\0';
 117         else
 118                 *rrpout = '\0';
 119 }
 120
 121 void
 122 checkpath(const char *path, char *resolved)
 123 {
 124         struct stat sb;
 125
 126         if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
 127                 if (!S_ISDIR(sb.st_mode))
 128                         errx(EX_USAGE, "%s: not a directory", resolved);
 129         } else
 130                 errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
 131 }