external/bsd/am-utils/dist/libamu/hasmntopt.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1997-2009 Erez Zadok
   5  * Copyright (c) 1990 Jan-Simon Pendry
   6  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   7  * Copyright (c) 1990 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Jan-Simon Pendry at Imperial College, London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14 n * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgment:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *
  42  * File: am-utils/libamu/hasmntopt.c
  43  *
  44  */
  45
  46 #ifdef HAVE_CONFIG_H
  47 # include <config.h>
  48 #endif /* HAVE_CONFIG_H */
  49 #include <am_defs.h>
  50 #include <amu.h>
  51
  52 #ifndef MNTMAXSTR
  53 # define MNTMAXSTR      256
  54 #endif /* not MNTMAXSTR */
  55
  56
  57 /*
  58  * Some systems don't provide these to the user,
  59  * but amd needs them, so...
  60  *
  61  * From: Piete Brooks <pb@cl.cam.ac.uk>
  62  */
  63 static char *
  64 nextmntopt(char **p)
  65 {
  66   char *cp = *p;
  67   char *rp;
  68
  69   /*
  70    * Skip past white space
  71    */
  72   while (*cp && isspace((unsigned char) *cp))
  73     cp++;
  74
  75   /*
  76    * Word starts here
  77    */
  78   rp = cp;
  79
  80   /*
  81    * Scan to send of string or separator
  82    */
  83   while (*cp && *cp != ',')
  84     cp++;
  85
  86   /*
  87    * If separator found the overwrite with null char.
  88    */
  89   if (*cp) {
  90     *cp = '\0';
  91     cp++;
  92   }
  93
  94   /*
  95    * Return value for next call
  96    */
  97   *p = cp;
  98   return rp;
  99 }
 100
 101
 102 /*
 103  * replacement for hasmntopt if the system does not have it.
 104  */
 105 char *
 106 amu_hasmntopt(mntent_t *mnt, char *opt)
 107 {
 108   char t[MNTMAXSTR];
 109   char *f;
 110   char *o = t;
 111   size_t l = strlen(opt);
 112
 113   xstrlcpy(t, mnt->mnt_opts, sizeof(t));
 114
 115   while (*(f = nextmntopt(&o)))
 116     if (NSTREQ(opt, f, l))
 117       return f - t + mnt->mnt_opts;
 118
 119   return 0;
 120 }