Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 186 insertions, 0 deletions

diff --git a/REORG.TODO/misc/fstab.c b/REORG.TODO/misc/fstab.c
new file mode 100644
index 0000000000..7da7e2b62b
--- /dev/null
+++ b/REORG.TODO/misc/fstab.c
@@ -0,0 +1,186 @@
+/* Copyright (C) 1995-2017 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);
+}