hasmntopt.c revision 310490 
1/*
2 * Copyright (c) 1997-2014 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12n * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/libamu/hasmntopt.c
37 *
38 */
39
40#ifdef HAVE_CONFIG_H
41# include <config.h>
42#endif /* HAVE_CONFIG_H */
43#include <am_defs.h>
44#include <amu.h>
45
46#ifndef MNTMAXSTR
47# define MNTMAXSTR	256
48#endif /* not MNTMAXSTR */
49
50
51/*
52 * Some systems don't provide these to the user,
53 * but amd needs them, so...
54 *
55 * From: Piete Brooks <pb@cl.cam.ac.uk>
56 */
57static char *
58nextmntopt(char **p)
59{
60  char *cp = *p;
61  char *rp;
62
63  /*
64   * Skip past white space
65   */
66  while (*cp && isspace((unsigned char) *cp))
67    cp++;
68
69  /*
70   * Word starts here
71   */
72  rp = cp;
73
74  /*
75   * Scan to send of string or separator
76   */
77  while (*cp && *cp != ',')
78    cp++;
79
80  /*
81   * If separator found the overwrite with null char.
82   */
83  if (*cp) {
84    *cp = '\0';
85    cp++;
86  }
87
88  /*
89   * Return value for next call
90   */
91  *p = cp;
92  return rp;
93}
94
95
96/*
97 * replacement for hasmntopt if the system does not have it.
98 */
99char *
100amu_hasmntopt(mntent_t *mnt, char *opt)
101{
102  char t[MNTMAXSTR];
103  char *f;
104  char *o = t;
105  size_t l = strlen(opt);
106
107  xstrlcpy(t, mnt->mnt_opts, sizeof(t));
108
109  while (*(f = nextmntopt(&o)))
110    if (NSTREQ(opt, f, l))
111      return f - t + mnt->mnt_opts;
112
113  return 0;
114}
115