minix/lib/libc/gen/fstab.c

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/* $NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $ */
/*
* Copyright (c) 1980, 1988, 1993
* 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>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: fstab.c,v 1.31 2012/03/13 21:13:34 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(endfsent,_endfsent)
__weak_alias(getfsent,_getfsent)
__weak_alias(getfsfile,_getfsfile)
__weak_alias(getfsspec,_getfsspec)
__weak_alias(setfsent,_setfsent)
#endif
static FILE *_fs_fp;
static size_t _fs_lineno = 0;
static const char *_fs_file = _PATH_FSTAB;
static struct fstab _fs_fstab;
static char *nextfld(char **, const char *);
static int fstabscan(void);
static char *
nextfld(char **str, const char *sep)
{
char *ret;
_DIAGASSERT(str != NULL);
_DIAGASSERT(sep != NULL);
while ((ret = stresep(str, sep, '\\')) != NULL && *ret == '\0')
continue;
return ret;
}
static int
fstabscan(void)
{
char *cp, *lp, *sp;
#define MAXLINELENGTH 1024
static char line[MAXLINELENGTH];
char subline[MAXLINELENGTH];
static const char sep[] = ":\n";
static const char ws[] = " \t\n";
static const char *fstab_type[] = {
FSTAB_RW, FSTAB_RQ, FSTAB_RO, FSTAB_SW, FSTAB_DP, FSTAB_XX, NULL
};
(void)memset(&_fs_fstab, 0, sizeof(_fs_fstab));
for (;;) {
if (!(lp = fgets(line, (int)sizeof(line), _fs_fp)))
return 0;
_fs_lineno++;
/* OLD_STYLE_FSTAB */
if (!strpbrk(lp, " \t")) {
_fs_fstab.fs_spec = nextfld(&lp, sep);
if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
continue;
_fs_fstab.fs_file = nextfld(&lp, sep);
_fs_fstab.fs_type = nextfld(&lp, sep);
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 =
__UNCONST(
strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
"ufs" : "swap");
if ((cp = nextfld(&lp, sep)) != NULL) {
_fs_fstab.fs_freq = atoi(cp);
if ((cp = nextfld(&lp, sep)) != NULL) {
_fs_fstab.fs_passno = atoi(cp);
return 1;
}
}
}
goto bad;
}
/* OLD_STYLE_FSTAB */
_fs_fstab.fs_spec = nextfld(&lp, ws);
if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
continue;
_fs_fstab.fs_file = nextfld(&lp, ws);
_fs_fstab.fs_vfstype = nextfld(&lp, ws);
_fs_fstab.fs_mntops = nextfld(&lp, ws);
if (_fs_fstab.fs_mntops == NULL)
goto bad;
_fs_fstab.fs_freq = 0;
_fs_fstab.fs_passno = 0;
if ((cp = nextfld(&lp, ws)) != NULL) {
_fs_fstab.fs_freq = atoi(cp);
if ((cp = nextfld(&lp, ws)) != NULL)
_fs_fstab.fs_passno = atoi(cp);
}
/* subline truncated iff line truncated */
(void)strlcpy(subline, _fs_fstab.fs_mntops, sizeof(subline));
sp = subline;
while ((cp = nextfld(&sp, ",")) != NULL) {
const char **tp;
if (strlen(cp) != 2)
continue;
for (tp = fstab_type; *tp; tp++)
if (strcmp(cp, *tp) == 0) {
_fs_fstab.fs_type = __UNCONST(*tp);
break;
}
if (*tp)
break;
}
if (_fs_fstab.fs_type == NULL)
goto bad;
if (strcmp(_fs_fstab.fs_type, FSTAB_XX) == 0)
continue;
if (cp != NULL)
return 1;
bad:
warnx("%s, %lu: Missing fields", _fs_file, (u_long)_fs_lineno);
}
/* NOTREACHED */
}
struct fstab *
getfsent(void)
{
if ((!_fs_fp && !setfsent()) || !fstabscan())
return NULL;
return &_fs_fstab;
}
struct fstab *
getfsspec(const char *name)
{
_DIAGASSERT(name != NULL);
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_spec, name))
return &_fs_fstab;
return NULL;
}
struct fstab *
getfsfile(const char *name)
{
_DIAGASSERT(name != NULL);
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_file, name))
return &_fs_fstab;
return NULL;
}
int
setfsent(void)
{
_fs_lineno = 0;
if (_fs_fp) {
rewind(_fs_fp);
return 1;
}
if ((_fs_fp = fopen(_PATH_FSTAB, "re")) == NULL) {
warn("Cannot open `%s'", _PATH_FSTAB);
return 0;
}
return 1;
}
void
endfsent(void)
{
if (_fs_fp) {
(void)fclose(_fs_fp);
_fs_fp = NULL;
}
}