/* Utilities for reading/writing fstab, mtab, etc.
-Copyright (C) 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+ Copyright (C) 1995-2016 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 free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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.
+ 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
+ Lesser 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. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <mntent.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/types.h>
+#include <stdlib.h>
+#include <libc-lock.h>
+
+/* We don't want to allocate the static buffer all the time since it
+ is not always used (in fact, rather infrequently). Accept the
+ extra cost of a `malloc'. */
+libc_freeres_ptr (static char *getmntent_buffer);
+
+/* This is the size of the buffer. This is really big. */
+#define BUFFER_SIZE 4096
-/* 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)
+static void
+allocate (void)
{
- if (stream) /* SunOS 4.x allows for NULL stream */
- fclose (stream);
- return 1; /* SunOS 4.x says to always return 1 */
+ getmntent_buffer = (char *) malloc (BUFFER_SIZE);
}
-/* 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;
+ __libc_once_define (static, once);
+ __libc_once (once, allocate);
- rest = strchr (rest, ',');
- }
+ if (getmntent_buffer == NULL)
+ /* If no core is available we don't have a chance to run the
+ program successfully and so returning NULL is an acceptable
+ result. */
+ return NULL;
- return NULL;
+ return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
}
projects / thirdparty / glibc.git / blobdiff