/*      $NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $     */

/*-
* Copyright (c) 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)getmntopts.c        8.3 (Berkeley) 3/29/95";
#else
__RCSID("$NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>

#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdlib.h>
#include <string.h>

#include <mntopts.h>

int getmnt_silent = 0;

static const char errmsg[] = "-o %s: option not supported";

struct mntoptparse {
       const char *options;
       const struct mntopt *mopts;
       char *optbuf;
       char **optarg;
};

const char *
getmntoptstr(mntoptparse_t mp, const char *opt)
{
       const struct mntopt *m;

       for (m = mp->mopts; m->m_option != NULL; m++)
               if (strcasecmp(opt, m->m_option) == 0)
                       break;

       if (m->m_option == NULL) {
               if (getmnt_silent == 0)
                       errx(1, errmsg, opt);
               else
                       return NULL;
       }

       return mp->optarg[m - mp->mopts];
}

long
getmntoptnum(mntoptparse_t mp, const char *opt)
{
       char *ep;
       long rv;
       void (*fun)(int, const char *, ...) = NULL;
       const char *val = getmntoptstr(mp, opt);

       if (val == NULL) {
               if (getmnt_silent == 0)
                       errx(1, "Missing %s argument", opt);
               else
                       return -1;
       }

       errno = 0;
       rv = strtol(val, &ep, 0);

       if (*ep)
               fun = errx;

       if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
               fun = err;

       if (fun) {
               if (getmnt_silent != 0)
                       return -1;
               (*fun)(1, "Invalid %s argument `%s'", opt, val);
       }
       return rv;
}

void
freemntopts(mntoptparse_t mp)
{
       free(mp->optbuf);
       free(mp->optarg);
       free(mp);
}

mntoptparse_t
getmntopts(const char *options, const struct mntopt *m0, int *flagp,
   int *altflagp)
{
       const struct mntopt *m;
       int negative;
       char *opt, *p;
       int *thisflagp;
       size_t nopts;
       mntoptparse_t mp;

       for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
               continue;

       if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
               return NULL;

       /* Copy option string, since it is about to be torn asunder... */
       if ((mp->optbuf = strdup(options)) == NULL) {
               free(mp);
               return NULL;
       }

       if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
               free(mp->optbuf);
               free(mp);
               return NULL;
       }

       mp->mopts = m0;
       mp->options = options;

       for (opt = mp->optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
               /* Check for "no" prefix. */
               if (opt[0] == 'n' && opt[1] == 'o') {
                       negative = 1;
                       opt += 2;
               } else
                       negative = 0;

               /*
                * for options with assignments in them (ie. quotas)
                * ignore the assignment as it's handled elsewhere
                */
               p = strchr(opt, '=');
               if (p) {
                        *p++ = '\0';
               }

               /* Scan option table. */
               for (m = m0; m->m_option != NULL; ++m)
                       if (strcasecmp(opt, m->m_option) == 0)
                               break;

               /* Save flag, or fail if option is not recognised. */
               if (m->m_option) {
                       mp->optarg[m - m0] = p;
                       thisflagp = m->m_altloc ? altflagp : flagp;
                       if (negative == m->m_inverse)
                               *thisflagp |= m->m_flag;
                       else
                               *thisflagp &= ~m->m_flag;
               } else if (!getmnt_silent) {
                       errx(1, errmsg, opt);
               } else {
                       free(mp->optbuf);
                       free(mp);

                       return NULL;
               }
       }
       return mp;
}