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-rw-r--r--misc/fstab.c195
1 files changed, 136 insertions, 59 deletions
diff --git a/misc/fstab.c b/misc/fstab.c
index 8b87a1f1f0..d241051ec9 100644
--- a/misc/fstab.c
+++ b/misc/fstab.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1995, 1996, 1997, 1998 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
@@ -19,98 +19,175 @@
#include <fstab.h>
#include <mntent.h>
#include <stdio.h>
+#include <stdlib.h>
+#include <bits/libc-lock.h>
-static FILE *fstab;
-static struct mntent mntres;
-static char buffer[8192];
+#define BUFFER_SIZE 0x1fc0
-
-static FILE *
-fstab_stream (void)
+struct fstab_state
{
- if (! fstab)
- fstab = setmntent (_PATH_FSTAB, "r");
- return fstab;
-}
+ 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)
{
- if (fstab)
- {
- rewind (fstab);
- return 1;
- }
- else
- fstab = setmntent (_PATH_FSTAB, "r");
- return fstab ? 0 : 1;
+ return fstab_init (1) != NULL;
}
-static struct fstab *
-internal_function
-mnt2fs (struct mntent *m)
-{
- static struct fstab f;
-
- if (m == NULL)
- return NULL;
-
- 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) ? (char *) FSTAB_RW :
- hasmntopt (m, FSTAB_RQ) ? (char *) FSTAB_RQ :
- hasmntopt (m, FSTAB_RO) ? (char *) FSTAB_RO :
- hasmntopt (m, FSTAB_SW) ? (char *) FSTAB_SW :
- hasmntopt (m, FSTAB_XX) ? (char *) FSTAB_XX :
- (char *) "??");
- f.fs_freq = m->mnt_freq;
- f.fs_passno = m->mnt_passno;
- return &f;
-}
struct fstab *
getfsent (void)
{
- FILE *s = fstab_stream ();
+ struct fstab_state *state;
- if (! s)
+ state = fstab_init (0);
+ if (state == NULL)
return NULL;
-
- return mnt2fs (__getmntent_r (s, &mntres, buffer, sizeof buffer));
+ if (fstab_fetch (state) == NULL)
+ return NULL;
+ return fstab_convert (state);
}
+
struct fstab *
getfsspec (name)
- register const char *name;
+ const char *name;
{
+ struct fstab_state *state;
struct mntent *m;
- if (setfsent ())
- while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
- if (!strcmp (m->mnt_fsname, name))
- return mnt2fs (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 (name)
- register const char *name;
+ const char *name;
{
+ struct fstab_state *state;
struct mntent *m;
- if (setfsent ())
- while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
- if (!strcmp (m->mnt_dir, name))
- return mnt2fs (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 ()
{
- if (fstab)
+ struct fstab_state *state;
+
+ state = &fstab_state;
+ if (state->fs_fp != NULL)
{
- (void) endmntent (fstab);
- fstab = 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. */
+static void
+__attribute__ ((unused))
+fstab_free (void)
+{
+ char *buffer;
+
+ buffer = fstab_state.fs_buffer;
+ if (buffer != NULL)
+ free ((void *) buffer);
+}
+
+text_set_element (__libc_subfreeres, fstab_free);