NetBSD/lib/libc/gen/fstab.c

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/* $NetBSD: fstab.c,v 1.12 1998/02/03 18:23:42 perry Exp $ */
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/*
* Copyright (c) 1980, 1988, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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>
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#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93";
#else
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__RCSID("$NetBSD: fstab.c,v 1.12 1998/02/03 18:23:42 perry Exp $");
#endif
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#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/uio.h>
#include <errno.h>
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#include <fstab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#ifdef __weak_alias
__weak_alias(endfsent,_endfsent);
__weak_alias(getfsent,_getfsent);
__weak_alias(getfsfile,_getfsfile);
__weak_alias(getfsspec,_getfsspec);
__weak_alias(setfsent,_setfsent);
#endif
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static FILE *_fs_fp;
static struct fstab _fs_fstab;
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static void error __P((int));
static int fstabscan __P((void));
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static int
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fstabscan()
{
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char *cp;
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#define MAXLINELENGTH 1024
static char line[MAXLINELENGTH];
char subline[MAXLINELENGTH];
int typexx;
static const char sep[] = ":\n";
static const char ws[] = " \t\n";
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for (;;) {
if (!(cp = fgets(line, sizeof(line), _fs_fp)))
return(0);
/* OLD_STYLE_FSTAB */
if (!strpbrk(cp, " \t")) {
_fs_fstab.fs_spec = strtok(cp, sep);
if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
continue;
_fs_fstab.fs_file = strtok(NULL, sep);
_fs_fstab.fs_type = strtok(NULL, sep);
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if (_fs_fstab.fs_type) {
if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
continue;
_fs_fstab.fs_mntops = _fs_fstab.fs_type;
_fs_fstab.fs_vfstype =
strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
"ufs" : "swap";
if ((cp = strtok(NULL, sep)) != NULL) {
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_fs_fstab.fs_freq = atoi(cp);
if ((cp = strtok(NULL, sep)) != NULL) {
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_fs_fstab.fs_passno = atoi(cp);
return(1);
}
}
}
goto bad;
}
/* OLD_STYLE_FSTAB */
_fs_fstab.fs_spec = strtok(cp, ws);
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if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
continue;
_fs_fstab.fs_file = strtok(NULL, ws);
_fs_fstab.fs_vfstype = strtok(NULL, ws);
_fs_fstab.fs_mntops = strtok(NULL, ws);
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if (_fs_fstab.fs_mntops == NULL)
goto bad;
_fs_fstab.fs_freq = 0;
_fs_fstab.fs_passno = 0;
if ((cp = strtok(NULL, ws)) != NULL) {
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_fs_fstab.fs_freq = atoi(cp);
if ((cp = strtok(NULL, ws)) != NULL)
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_fs_fstab.fs_passno = atoi(cp);
}
(void)strncpy(subline, _fs_fstab.fs_mntops, sizeof(subline)-1);
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for (typexx = 0, cp = strtok(subline, ","); cp;
cp = strtok((char *)NULL, ",")) {
if (strlen(cp) != 2)
continue;
if (!strcmp(cp, FSTAB_RW)) {
_fs_fstab.fs_type = FSTAB_RW;
break;
}
if (!strcmp(cp, FSTAB_RQ)) {
_fs_fstab.fs_type = FSTAB_RQ;
break;
}
if (!strcmp(cp, FSTAB_RO)) {
_fs_fstab.fs_type = FSTAB_RO;
break;
}
if (!strcmp(cp, FSTAB_SW)) {
_fs_fstab.fs_type = FSTAB_SW;
break;
}
if (!strcmp(cp, FSTAB_XX)) {
_fs_fstab.fs_type = FSTAB_XX;
typexx++;
break;
}
}
if (typexx)
continue;
if (cp != NULL)
return(1);
bad: /* no way to distinguish between EOF and syntax error */
error(EFTYPE);
}
/* NOTREACHED */
}
struct fstab *
getfsent()
{
if ((!_fs_fp && !setfsent()) || !fstabscan())
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return((struct fstab *)NULL);
return(&_fs_fstab);
}
struct fstab *
getfsspec(name)
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const char *name;
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{
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_spec, name))
return(&_fs_fstab);
return((struct fstab *)NULL);
}
struct fstab *
getfsfile(name)
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const char *name;
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{
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_file, name))
return(&_fs_fstab);
return((struct fstab *)NULL);
}
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int
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setfsent()
{
if (_fs_fp) {
rewind(_fs_fp);
return(1);
}
if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL)
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return(1);
error(errno);
return(0);
}
void
endfsent()
{
if (_fs_fp) {
(void)fclose(_fs_fp);
_fs_fp = NULL;
}
}
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static void
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error(err)
int err;
{
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struct iovec iov[5];
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iov[0].iov_base = "fstab: ";
iov[0].iov_len = 7;
iov[1].iov_base = _PATH_FSTAB;
iov[1].iov_len = sizeof(_PATH_FSTAB) - 1;
iov[2].iov_base = ": ";
iov[2].iov_len = 2;
iov[3].iov_base = strerror(err);
iov[3].iov_len = strlen(iov[3].iov_base);
iov[4].iov_base = "\n";
iov[4].iov_len = 1;
(void)writev(STDERR_FILENO, iov, 5);
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}