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/* Utilities for reading/writing fstab, mtab, etc.
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <mntent.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
/* Prepare to begin reading and/or writing mount table entries from the
beginning of FILE. MODE is as for `fopen'. */
FILE *
setmntent (const char *file, const char *mode)
{
return fopen (file, mode);
}
/* Close a stream opened with `setmntent'. */
int
endmntent (FILE *stream)
{
if (stream) /* SunOS 4.x allows for NULL stream */
fclose (stream);
return 1; /* SunOS 4.x says to always return 1 */
}
/* Read one mount table entry from STREAM. Returns a pointer to storage
reused on the next call, or null for EOF or error (use feof/ferror to
check). */
struct mntent *
getmntent (FILE *stream)
{
static char *buf;
static size_t bufsiz;
static struct mntent m;
ssize_t nread;
char *head;
do
{
nread = getline (&buf, &bufsiz, stream);
if (nread <= 0)
return NULL;
if (buf[nread - 1] == '\n') /* chop newline */
buf[nread - 1] = '\0';
head = buf + strspn (buf, " \t");
/* skip empty lines and comment lines: */
} while (head[0] == '\0' || head[0] == '#');
m.mnt_fsname = strsep (&head, " \t") ?: (char *) "";
if (head)
head += strspn (head, " \t");
m.mnt_dir = strsep (&head, " \t") ?: (char *) "";
if (head)
head += strspn (head, " \t");
m.mnt_type = strsep (&head, " \t") ?: (char *) "";
if (head)
head += strspn (head, " \t");
m.mnt_opts = strsep (&head, " \t") ?: (char *) "";
switch (head ? sscanf (head, " %d %d ", &m.mnt_freq, &m.mnt_passno) : 0)
{
case 0:
m.mnt_freq = 0;
case 1:
m.mnt_passno = 0;
case 2:
}
return &m;
}
/* Write the mount table entry described by MNT to STREAM.
Return zero on success, nonzero on failure. */
int
addmntent (FILE *stream, const struct mntent *mnt)
{
if (fseek (stream, 0, SEEK_END))
return 1;
return (fprintf (stream, "%s %s %s %s %d %d\n",
mnt->mnt_fsname,
mnt->mnt_dir,
mnt->mnt_type,
mnt->mnt_opts,
mnt->mnt_freq,
mnt->mnt_passno)
< 0 ? 1 : 0);
}
/* Search MNT->mnt_opts for an option matching OPT.
Returns the address of the substring, or null if none found. */
char *
hasmntopt (const struct mntent *mnt, const char *opt)
{
const size_t optlen = strlen (opt);
char *rest = mnt->mnt_opts, *p;
while ((p = strstr (rest, opt)) != NULL)
{
if (p == rest || p[-1] == ',' &&
(p[optlen] == '\0' ||
p[optlen] == '=' ||
p[optlen] == ','))
return p;
rest = strchr (rest, ',');
}
return NULL;
}
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