From 7a770247ab47579223da3ba873ca8236e5760b74 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Thu, 14 Sep 1995 09:00:06 +0000 Subject: Tue Sep 12 14:30:07 1995 Roland McGrath * 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 * posix/glob.c (glob): Comment fix. --- misc/mntent.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 misc/mntent.c (limited to 'misc/mntent.c') diff --git a/misc/mntent.c b/misc/mntent.c new file mode 100644 index 0000000000..42c20817ba --- /dev/null +++ b/misc/mntent.c @@ -0,0 +1,111 @@ +/* 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 +#include +#include + +/* 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) +{ + return fclose (stream); +} + + +/* 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; + char *head; + + do + { + if (getline (&buf, &bufsiz, stream) < 0) + return NULL; + + head = buf; + } while (head[0] == '#'); /* Skip comment lines. */ + + m.mnt_fsname = strsep (&head, " \t") ?: (char *) ""; + m.mnt_dir = strsep (&head, " \t") ?: (char *) ""; + m.mnt_type = strsep (&head, " \t") ?: (char *) ""; + m.mnt_opts = strsep (&head, " \t") ?: (char *) ""; + switch (sscanf (head, "%d %d\n", &m.mnt_freq, &m.mnt_passno)) + { + 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) +{ + 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; +} + -- cgit 1.4.1