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-rw-r--r--libdb/db_gdbm.c173
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diff --git a/libdb/db_gdbm.c b/libdb/db_gdbm.c
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+/*
+ * db_gdbm.c: low level gdbm 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 GDBM
+
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "stat-time.h"
+#include "timespec.h"
+#include "xalloc.h"
+
+#include "manconfig.h"
+
+#include "cleanup.h"
+#include "debug.h"
+
+#include "db_xdbm.h"
+#include "mydbm.h"
+
+/* setjmp/longjmp handling to defend against _gdbm_fatal exiting under our
+ * feet. Not thread-safe, but there is no plan for man-db to ever use
+ * threads.
+ */
+static jmp_buf open_env;
+static bool opening;
+
+/* Mimic _gdbm_fatal's error output, but handle errors during open more
+ * gracefully than exiting.
+ */
+static void trap_error (const char *val)
+{
+ if (opening) {
+ debug ("gdbm error: %s\n", val);
+ longjmp (open_env, 1);
+ } else
+ fprintf (stderr, "gdbm fatal: %s\n", val);
+}
+
+man_gdbm_wrapper man_gdbm_new (const char *name)
+{
+ man_gdbm_wrapper wrap;
+
+ wrap = xmalloc (sizeof *wrap);
+ wrap->name = xstrdup (name);
+ wrap->file = NULL;
+ wrap->mtime = NULL;
+
+ return wrap;
+}
+
+bool man_gdbm_open_wrapper (man_gdbm_wrapper wrap, int flags)
+{
+ datum key, content;
+
+ opening = true;
+ if (setjmp (open_env))
+ return false;
+ wrap->file = gdbm_open (wrap->name, BLK_SIZE, flags, DBMODE,
+ trap_error);
+ if (!wrap->file)
+ return false;
+
+ if ((flags & ~GDBM_FAST) != GDBM_NEWDB) {
+ /* While the setjmp/longjmp guard is in effect, make sure we
+ * can read from the database at all.
+ */
+ memset (&key, 0, sizeof key);
+ MYDBM_SET (key, xstrdup (VER_KEY));
+ content = MYDBM_FETCH (wrap, key);
+ MYDBM_FREE_DPTR (key);
+ MYDBM_FREE_DPTR (content);
+ }
+
+ opening = false;
+
+ return true;
+}
+
+static datum unsorted_firstkey (man_gdbm_wrapper wrap)
+{
+ return gdbm_firstkey (wrap->file);
+}
+
+static datum unsorted_nextkey (man_gdbm_wrapper wrap, datum key)
+{
+ return gdbm_nextkey (wrap->file, key);
+}
+
+datum man_gdbm_firstkey (man_gdbm_wrapper wrap)
+{
+ return man_xdbm_firstkey (wrap, unsorted_firstkey, unsorted_nextkey);
+}
+
+datum man_gdbm_nextkey (man_gdbm_wrapper wrap, datum key)
+{
+ return man_xdbm_nextkey (wrap, key);
+}
+
+struct timespec man_gdbm_get_time (man_gdbm_wrapper wrap)
+{
+ struct stat st;
+
+ if (!wrap->mtime) {
+ wrap->mtime = XMALLOC (struct timespec);
+ if (fstat (gdbm_fdesc (wrap->file), &st) < 0) {
+ wrap->mtime->tv_sec = -1;
+ wrap->mtime->tv_nsec = -1;
+ } else
+ *wrap->mtime = get_stat_mtime (&st);
+ }
+
+ return *wrap->mtime;
+}
+
+static void raw_close (man_gdbm_wrapper wrap)
+{
+ if (wrap->file)
+ gdbm_close (wrap->file);
+}
+
+void man_gdbm_free (man_gdbm_wrapper wrap)
+{
+ man_xdbm_free (wrap, raw_close);
+}
+
+#ifndef HAVE_GDBM_EXISTS
+
+int gdbm_exists (GDBM_FILE file, datum key)
+{
+ char *memory;
+
+ memory = MYDBM_DPTR (gdbm_fetch (file, key));
+ if (memory) {
+ free (memory);
+ return 1;
+ }
+
+ return 0;
+}
+
+#endif /* !HAVE_GDBM_EXISTS */
+
+#endif /* GDBM */