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glibc/misc/fstab.c
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/* 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 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 | |
Lesser General Public License for more details. | |
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 <fstab.h> | |
#include <mntent.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <libc-lock.h> | |
#define BUFFER_SIZE 0x1fc0 | |
struct fstab_state | |
{ | |
FILE *fs_fp; | |
char *fs_buffer; | |
struct mntent fs_mntres; | |
struct fstab fs_ret; | |
}; | |
static struct fstab_state *fstab_init (int opt_rewind); | |
static struct mntent *fstab_fetch (struct fstab_state *state); | |
static struct fstab *fstab_convert (struct fstab_state *state); | |
static struct fstab_state fstab_state; | |
int | |
setfsent (void) | |
{ | |
return fstab_init (1) != NULL; | |
} | |
struct fstab * | |
getfsent (void) | |
{ | |
struct fstab_state *state; | |
state = fstab_init (0); | |
if (state == NULL) | |
return NULL; | |
if (fstab_fetch (state) == NULL) | |
return NULL; | |
return fstab_convert (state); | |
} | |
struct fstab * | |
getfsspec (const char *name) | |
{ | |
struct fstab_state *state; | |
struct mntent *m; | |
state = fstab_init (1); | |
if (state == NULL) | |
return NULL; | |
while ((m = fstab_fetch (state)) != NULL) | |
if (strcmp (m->mnt_fsname, name) == 0) | |
return fstab_convert (state); | |
return NULL; | |
} | |
struct fstab * | |
getfsfile (const char *name) | |
{ | |
struct fstab_state *state; | |
struct mntent *m; | |
state = fstab_init (1); | |
if (state == NULL) | |
return NULL; | |
while ((m = fstab_fetch (state)) != NULL) | |
if (strcmp (m->mnt_dir, name) == 0) | |
return fstab_convert (state); | |
return NULL; | |
} | |
void | |
endfsent (void) | |
{ | |
struct fstab_state *state; | |
state = &fstab_state; | |
if (state->fs_fp != NULL) | |
{ | |
(void) __endmntent (state->fs_fp); | |
state->fs_fp = NULL; | |
} | |
} | |
static struct fstab_state * | |
fstab_init (int opt_rewind) | |
{ | |
struct fstab_state *state; | |
char *buffer; | |
FILE *fp; | |
state = &fstab_state; | |
buffer = state->fs_buffer; | |
if (buffer == NULL) | |
{ | |
buffer = (char *) malloc (BUFFER_SIZE); | |
if (buffer == NULL) | |
return NULL; | |
state->fs_buffer = buffer; | |
} | |
fp = state->fs_fp; | |
if (fp != NULL) | |
{ | |
if (opt_rewind) | |
rewind (fp); | |
} | |
else | |
{ | |
fp = __setmntent (_PATH_FSTAB, "r"); | |
if (fp == NULL) | |
return NULL; | |
state->fs_fp = fp; | |
} | |
return state; | |
} | |
static struct mntent * | |
fstab_fetch (struct fstab_state *state) | |
{ | |
return __getmntent_r (state->fs_fp, &state->fs_mntres, | |
state->fs_buffer, BUFFER_SIZE); | |
} | |
static struct fstab * | |
fstab_convert (struct fstab_state *state) | |
{ | |
struct mntent *m; | |
struct fstab *f; | |
m = &state->fs_mntres; | |
f = &state->fs_ret; | |
f->fs_spec = m->mnt_fsname; | |
f->fs_file = m->mnt_dir; | |
f->fs_vfstype = m->mnt_type; | |
f->fs_mntops = m->mnt_opts; | |
f->fs_type = (__hasmntopt (m, FSTAB_RW) ? FSTAB_RW : | |
__hasmntopt (m, FSTAB_RQ) ? FSTAB_RQ : | |
__hasmntopt (m, FSTAB_RO) ? FSTAB_RO : | |
__hasmntopt (m, FSTAB_SW) ? FSTAB_SW : | |
__hasmntopt (m, FSTAB_XX) ? FSTAB_XX : | |
"??"); | |
f->fs_freq = m->mnt_freq; | |
f->fs_passno = m->mnt_passno; | |
return f; | |
} | |
/* Make sure the memory is freed if the programs ends while in | |
memory-debugging mode and something actually was allocated. */ | |
libc_freeres_fn (fstab_free) | |
{ | |
char *buffer; | |
buffer = fstab_state.fs_buffer; | |
free ((void *) buffer); | |
} |