1 files changed, 203 insertions, 0 deletions
diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c
new file mode 100644
index 0000000..3f6f35d
--- /dev/null
+++ b/nss/nss_db/db-XXX.c
@@ -0,0 +1,203 @@
+/* Common code for DB-based databases in nss_db module.
+Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <db.h>
+#include <fcntl.h>
+#include <libc-lock.h>
+#include "nsswitch.h"
+
+/* These symbols are defined by the including source file:
+
+   ENTNAME -- database name of the structure and functions (hostent, pwent).
+   STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
+   DATABASE -- database file name, ("hosts", "passwd")
+
+   NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
+*/
+
+#define ENTNAME_r	CONCAT(ENTNAME,_r)
+
+#include <paths.h>
+#define	DBFILE		_PATH_VARDB DATABASE
+
+#ifdef NEED_H_ERRNO
+#define H_ERRNO_PROTO	, int *herrnop
+#define H_ERRNO_ARG	, herrnop
+#define H_ERRNO_SET(val) (*herrnop = (val))
+#else
+#define H_ERRNO_PROTO
+#define H_ERRNO_ARG
+#define H_ERRNO_SET(val) ((void) 0)
+#endif
+
+/* Locks the static variables in this file.  */
+__libc_lock_define_initialized (static, lock);
+
+/* Maintenance of the shared handle open on the database.  */
+
+static DB *db;
+static int keep_db;
+static unsigned int entidx;	/* Index for `getENTNAME'. */
+
+/* Open database file if not already opened.  */
+static int
+internal_setent (int stayopen)
+{
+  int status = NSS_STATUS_SUCCESS;
+
+  if (db == NULL)
+    {
+      db = dbopen (DBFILE, O_RDONLY, 0, DB_BTREE, NULL);
+
+      if (db == NULL)
+	status = NSS_STATUS_UNAVAIL;
+    }
+
+  /* Remember STAYOPEN flag.  */
+  if (db != NULL)
+    keep_db |= stayopen;
+
+  return status;
+}
+
+
+/* Thread-safe, exported version of that.  */
+int
+CONCAT(_nss_files_set,ENTNAME) (int stayopen)
+{
+  int status;
+
+  __libc_lock_lock (lock);
+
+  status = internal_setent (stayopen);
+
+  /* Reset the sequential index.  */
+  entidx = 0;
+
+  __libc_lock_unlock (lock);
+
+  return status;
+}
+
+
+/* Close the database file.  */
+static void
+internal_endent (void)
+{
+  if (db != NULL)
+    {
+      (*db->close) (db);
+      db = NULL;
+    }
+}
+
+
+/* Thread-safe, exported version of that.  */
+int
+CONCAT(_nss_files_end,ENTNAME) (void)
+{
+  __libc_lock_lock (lock);
+
+  internal_endent ();
+
+  /* Reset STAYOPEN flag.  */
+  keep_db = 0;
+
+  __libc_lock_unlock (lock);
+
+  return NSS_STATUS_SUCCESS;
+}
+
+/* Do a database lookup for KEY.  */
+static enum nss_status
+lookup (const DBT *key, struct STRUCTURE *result,
+	void *buffer, int buflen H_ERRNO_PROTO)
+{
+  enum nss_status status;
+  DBT value;
+
+  /* Open the database.  */
+  internal_setent (keep_db);
+
+  /* Succeed iff it matches a value that parses correctly.  */
+  status = (((*db->get) (db, key, &value, 0) == 0 &&
+	     parse_line (value.data, result, buffer, buflen) == 0)
+	    ? NSS_STATUS_SUCCESS : NSS_STATUS_NOTFOUND);
+
+  if (! keep_db)
+    internal_endent ();
+
+  return status;
+}
+
+
+/* Macro for defining lookup functions for this DB-based database.
+
+   NAME is the name of the lookup; e.g. `pwnam'.
+
+   KEYPATTERN gives `printf' args to construct a key string;
+   e.g. `(".%s", name)'.
+
+   KEYSIZE gives the allocation size of a buffer to construct it in;
+   e.g. `1 + strlen (name)'.
+
+   PROTO describes the arguments for the lookup key;
+   e.g. `const char *name'.
+
+   BREAK_IF_MATCH is ignored, but used by ../nss_files/files-XXX.c.  */
+
+#define DB_LOOKUP(name, keysize, keypattern, break_if_match, proto...)	      \
+enum nss_status								      \
+_nss_files_get##name##_r (proto,					      \
+			  struct STRUCTURE *result,			      \
+			  char *buffer, int buflen H_ERRNO_PROTO)	      \
+{									      \
+  DBT key;								      \
+  enum nss_status status;						      \
+  const size_t size = (keysize);					      \
+  key.data = __alloca (size);						      \
+  key.size = KEYPRINTF keypattern;					      \
+  __libc_lock_lock (lock);						      \
+  status = lookup (&key, result, buffer, buflen H_ERRNO_ARG);		      \
+  __libc_lock_unlock (lock);						      \
+  return status;							      \
+}
+
+#define KEYPRINTF(pattern, args...) snprintf (key.data, size, pattern ,##args)
+
+
+
+
+/* Return the next entry from the database file, doing locking.  */
+enum nss_status
+CONCAT(_nss_files_get,ENTNAME_r) (struct STRUCTURE *result,
+				  char *buffer, int buflen H_ERRNO_PROTO)
+{
+  /* Return next entry in host file.  */
+  enum nss_status status;
+  char buf[20];
+  DBT key;
+
+  __libc_lock_lock (lock);
+  key.size = 1 + snprintf (key.data = buf, sizeof buf, "0%u", entidx++);
+  status = lookup (&key, result, buffer, buflen H_ERRNO_ARG);
+  __libc_lock_unlock (lock);
+
+  return status;
+}