/* Utilities for reading/writing fstab, mtab, etc. Copyright (C) 1995, 1996, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <mntent.h> #include <stdio.h> #include <string.h> #include <sys/types.h> /* 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); } weak_alias (__setmntent, setmntent) /* Close a stream opened with `setmntent'. */ int __endmntent (FILE *stream) { if (stream) /* SunOS 4.x allows for NULL stream */ fclose (stream); return 1; /* SunOS 4.x says to always return 1 */ } weak_alias (__endmntent, endmntent) /* 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_r (FILE *stream, struct mntent *mp, char *buffer, int bufsiz) { char *head; do { char *end_ptr; if (fgets (buffer, bufsiz, stream) == NULL) return NULL; end_ptr = strchr (buffer, '\n'); if (end_ptr != NULL) /* chop newline */ *end_ptr = '\0'; else { /* Not the whole line was read. Do it now but forget it. */ char tmp[1024]; while (fgets (tmp, sizeof tmp, stream) != NULL) if (strchr (tmp, '\n') != NULL) break; } head = buffer + strspn (buffer, " \t"); /* skip empty lines and comment lines: */ } while (head[0] == '\0' || head[0] == '#'); mp->mnt_fsname = __strsep (&head, " \t") ?: (char *) ""; if (head) head += strspn (head, " \t"); mp->mnt_dir = __strsep (&head, " \t") ?: (char *) ""; if (head) head += strspn (head, " \t"); mp->mnt_type = __strsep (&head, " \t") ?: (char *) ""; if (head) head += strspn (head, " \t"); mp->mnt_opts = __strsep (&head, " \t") ?: (char *) ""; switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno) : 0) { case 0: mp->mnt_freq = 0; case 1: mp->mnt_passno = 0; case 2: } return mp; } weak_alias (__getmntent_r, getmntent_r) /* 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); } weak_alias (__addmntent, addmntent) /* 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, ','); if (rest == NULL) break; ++rest; } return NULL; } weak_alias (__hasmntopt, hasmntopt)