Adding upstream version 2.12.0.upstream/2.12.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 160 insertions, 0 deletions

diff --git a/libdb/db_ndbm.c b/libdb/db_ndbm.c
new file mode 100644
index 0000000..b447e65
--- /dev/null
+++ b/libdb/db_ndbm.c
@@ -0,0 +1,160 @@
+/*
+ * db_ndbm.c: low level ndbm interface routines for man.
+ *
+ * Copyright (C) 1994, 1995 Graeme W. Wilford. (Wilf.)
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Mon Aug  8 20:35:30 BST 1994  Wilf. (G.Wilford@ee.surrey.ac.uk)
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#ifdef NDBM
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <sys/file.h> /* for flock() */
+#include <sys/types.h> /* for open() */
+#include <sys/stat.h>
+
+#include "attribute.h"
+#include "stat-time.h"
+#include "timespec.h"
+#include "xalloc.h"
+#include "xvasprintf.h"
+
+#include "manconfig.h"
+
+#include "db_storage.h"
+#include "db_xdbm.h"
+#include "mydbm.h"
+
+/* release the lock and close the database */
+static void raw_close (man_ndbm_wrapper wrap)
+{
+	if (wrap->file) {
+		flock (dbm_dirfno (wrap->file), LOCK_UN);
+		dbm_close (wrap->file);
+	}
+}
+
+void man_ndbm_free (man_ndbm_wrapper wrap)
+{
+	man_xdbm_free (wrap, raw_close);
+}
+
+man_ndbm_wrapper man_ndbm_new (const char *name)
+{
+	man_ndbm_wrapper wrap;
+
+	wrap = xmalloc (sizeof *wrap);
+	wrap->name = xstrdup (name);
+	wrap->file = NULL;
+	wrap->mtime = NULL;
+
+	return wrap;
+}
+
+/* open a ndbm type database, with file locking. */
+bool man_ndbm_open (man_ndbm_wrapper wrap, int flags, int mode)
+{
+	int lock_op;
+	int lock_failed;
+
+	if (flags & ~O_RDONLY) {
+		/* flags includes O_RDWR or O_WRONLY, need an exclusive lock */
+		lock_op = LOCK_EX | LOCK_NB;
+	} else {
+		lock_op = LOCK_SH | LOCK_NB;
+	}
+
+	if (flags & O_TRUNC) {
+		/* opening the db is destructive, need to lock first */
+		char *dir_fname;
+		int dir_fd;
+
+		wrap->file = NULL;
+		lock_failed = 1;
+		dir_fname = xasprintf ("%s.dir", wrap->name);
+		dir_fd = open (dir_fname, flags & ~O_TRUNC, mode);
+		free (dir_fname);
+		if (dir_fd != -1) {
+			if (!(lock_failed = flock (dir_fd, lock_op)))
+				wrap->file = dbm_open (wrap->name, flags,
+						       mode);
+			close (dir_fd);
+		}
+	} else {
+		wrap->file = dbm_open (wrap->name, flags, mode);
+		if (wrap->file)
+			lock_failed = flock (dbm_dirfno (wrap->file), lock_op);
+	}
+
+	if (!wrap->file)
+		return false;
+
+	if (lock_failed) {
+		gripe_lock (wrap->name);
+		dbm_close (wrap->file);
+		return false;
+	}
+
+	return true;
+}
+
+static datum unsorted_firstkey (man_ndbm_wrapper wrap)
+{
+	return copy_datum (dbm_firstkey (wrap->file));
+}
+
+static datum unsorted_nextkey (man_ndbm_wrapper wrap, datum key MAYBE_UNUSED)
+{
+	return copy_datum (dbm_nextkey (wrap->file));
+}
+
+datum man_ndbm_firstkey (man_ndbm_wrapper wrap)
+{
+	return man_xdbm_firstkey (wrap, unsorted_firstkey, unsorted_nextkey);
+}
+
+datum man_ndbm_nextkey (man_ndbm_wrapper wrap, datum key)
+{
+	return man_xdbm_nextkey (wrap, key);
+}
+
+struct timespec man_ndbm_get_time (man_ndbm_wrapper wrap)
+{
+	struct stat st;
+
+	if (!wrap->mtime) {
+		wrap->mtime = XMALLOC (struct timespec);
+		if (fstat (dbm_dirfno (wrap->file), &st) < 0) {
+			wrap->mtime->tv_sec = -1;
+			wrap->mtime->tv_nsec = -1;
+		} else
+			*wrap->mtime = get_stat_mtime (&st);
+	}
+
+	return *wrap->mtime;
+}
+
+#endif /* NDBM */