187 lines
3.8 KiB
C
187 lines
3.8 KiB
C
/* Copyright (C) 1995-2022 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fstab.h>
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#include <mntent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libc-lock.h>
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#define BUFFER_SIZE 0x1fc0
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struct fstab_state
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{
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FILE *fs_fp;
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char *fs_buffer;
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struct mntent fs_mntres;
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struct fstab fs_ret;
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};
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static struct fstab_state *fstab_init (int opt_rewind);
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static struct mntent *fstab_fetch (struct fstab_state *state);
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static struct fstab *fstab_convert (struct fstab_state *state);
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static struct fstab_state fstab_state;
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int
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setfsent (void)
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{
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return fstab_init (1) != NULL;
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}
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struct fstab *
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getfsent (void)
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{
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struct fstab_state *state;
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state = fstab_init (0);
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if (state == NULL)
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return NULL;
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if (fstab_fetch (state) == NULL)
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return NULL;
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return fstab_convert (state);
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}
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struct fstab *
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getfsspec (const char *name)
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{
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struct fstab_state *state;
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struct mntent *m;
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state = fstab_init (1);
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if (state == NULL)
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return NULL;
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while ((m = fstab_fetch (state)) != NULL)
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if (strcmp (m->mnt_fsname, name) == 0)
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return fstab_convert (state);
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return NULL;
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}
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struct fstab *
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getfsfile (const char *name)
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{
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struct fstab_state *state;
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struct mntent *m;
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state = fstab_init (1);
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if (state == NULL)
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return NULL;
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while ((m = fstab_fetch (state)) != NULL)
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if (strcmp (m->mnt_dir, name) == 0)
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return fstab_convert (state);
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return NULL;
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}
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void
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endfsent (void)
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{
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struct fstab_state *state;
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state = &fstab_state;
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if (state->fs_fp != NULL)
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{
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(void) __endmntent (state->fs_fp);
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state->fs_fp = NULL;
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}
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}
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static struct fstab_state *
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fstab_init (int opt_rewind)
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{
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struct fstab_state *state;
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char *buffer;
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FILE *fp;
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state = &fstab_state;
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buffer = state->fs_buffer;
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if (buffer == NULL)
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{
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buffer = (char *) malloc (BUFFER_SIZE);
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if (buffer == NULL)
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return NULL;
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state->fs_buffer = buffer;
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}
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fp = state->fs_fp;
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if (fp != NULL)
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{
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if (opt_rewind)
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rewind (fp);
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}
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else
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{
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fp = __setmntent (_PATH_FSTAB, "r");
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if (fp == NULL)
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return NULL;
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state->fs_fp = fp;
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}
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return state;
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}
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static struct mntent *
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fstab_fetch (struct fstab_state *state)
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{
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return __getmntent_r (state->fs_fp, &state->fs_mntres,
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state->fs_buffer, BUFFER_SIZE);
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}
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static struct fstab *
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fstab_convert (struct fstab_state *state)
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{
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struct mntent *m;
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struct fstab *f;
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m = &state->fs_mntres;
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f = &state->fs_ret;
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f->fs_spec = m->mnt_fsname;
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f->fs_file = m->mnt_dir;
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f->fs_vfstype = m->mnt_type;
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f->fs_mntops = m->mnt_opts;
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f->fs_type = (__hasmntopt (m, FSTAB_RW) ? FSTAB_RW
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: __hasmntopt (m, FSTAB_RQ) ? FSTAB_RQ
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: __hasmntopt (m, FSTAB_RO) ? FSTAB_RO
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: __hasmntopt (m, FSTAB_SW) ? FSTAB_SW
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: __hasmntopt (m, FSTAB_XX) ? FSTAB_XX
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: "??");
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f->fs_freq = m->mnt_freq;
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f->fs_passno = m->mnt_passno;
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return f;
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}
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/* Make sure the memory is freed if the programs ends while in
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memory-debugging mode and something actually was allocated. */
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libc_freeres_fn (fstab_free)
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{
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char *buffer;
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buffer = fstab_state.fs_buffer;
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free ((void *) buffer);
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}
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