diff options
Diffstat (limited to 'misc/mntent_r.c')
| -rw-r--r-- | misc/mntent_r.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/misc/mntent_r.c b/misc/mntent_r.c new file mode 100644 index 0000000..9395525 --- /dev/null +++ b/misc/mntent_r.c @@ -0,0 +1,141 @@ +/* Utilities for reading/writing fstab, mtab, etc. +Copyright (C) 1995, 1996 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 <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, ','); + } + + return NULL; +} +weak_alias (__hasmntopt, hasmntopt) |