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* misc/mntent.c: New file. * misc/mntent.h: New file. * misc/Makefile (headers): Added mntent.h. (routines): Added mntent. * misc/fstab.c: Rewritten using mntent functions. Mon Sep 11 14:00:14 1995 Roland McGrath <roland@whiz-bang.gnu.ai.mit.edu> * posix/glob.c (glob): Comment fix.
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/* Utilities for reading/writing fstab, mtab, etc.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <mntent.h>
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#include <stdio.h>
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#include <string.h>
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/* Prepare to begin reading and/or writing mount table entries from the
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beginning of FILE. MODE is as for `fopen'. */
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FILE *
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setmntent (const char *file, const char *mode)
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{
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return fopen (file, mode);
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}
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/* Close a stream opened with `setmntent'. */
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int
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endmntent (FILE *stream)
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{
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return fclose (stream);
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}
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/* Read one mount table entry from STREAM. Returns a pointer to storage
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reused on the next call, or null for EOF or error (use feof/ferror to
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check). */
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struct mntent *
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getmntent (FILE *stream)
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{
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static char *buf;
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static size_t bufsiz;
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static struct mntent m;
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char *head;
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do
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{
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if (getline (&buf, &bufsiz, stream) < 0)
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return NULL;
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head = buf;
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} while (head[0] == '#'); /* Skip comment lines. */
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m.mnt_fsname = strsep (&head, " \t") ?: (char *) "";
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m.mnt_dir = strsep (&head, " \t") ?: (char *) "";
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m.mnt_type = strsep (&head, " \t") ?: (char *) "";
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m.mnt_opts = strsep (&head, " \t") ?: (char *) "";
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switch (sscanf (head, "%d %d\n", &m.mnt_freq, &m.mnt_passno))
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{
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case 0:
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m.mnt_freq = 0;
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case 1:
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m.mnt_passno = 0;
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case 2:
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}
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return &m;
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}
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/* Write the mount table entry described by MNT to STREAM.
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Return zero on success, nonzero on failure. */
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int
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addmntent (FILE *stream, const struct mntent *mnt)
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{
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return (fprintf (stream, "%s %s %s %s %d %d\n",
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mnt->mnt_fsname,
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mnt->mnt_dir,
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mnt->mnt_type,
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mnt->mnt_opts,
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mnt->mnt_freq,
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mnt->mnt_passno)
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< 0 ? -1 : 0);
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}
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/* Search MNT->mnt_opts for an option matching OPT.
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Returns the address of the substring, or null if none found. */
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char *
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hasmntopt (const struct mntent *mnt, const char *opt)
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{
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const size_t optlen = strlen (opt);
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char *rest = mnt->mnt_opts, *p;
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while ((p = strstr (rest, opt)) != NULL)
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{
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if (p == rest || p[-1] == ',' &&
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(p[optlen] == '\0' ||
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p[optlen] == '=' ||
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p[optlen] == ','))
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return p;
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rest = strchr (rest, ',');
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}
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return NULL;
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}
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