/* Generic errno.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2005 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
#ifndef _AC_ERRNO_H
#define _AC_ERRNO_H
# include <sys/errno.h>
#endif
-#ifdef DECL_SYS_ERRLIST
-extern int sys_nerr;
-extern char *sys_errlist[];
+#ifndef HAVE_SYS_ERRLIST
+ /* no sys_errlist */
+# define sys_nerr 0
+# define sys_errlist ((char **)0)
+#elif DECL_SYS_ERRLIST
+ /* have sys_errlist but need declaration */
+ LDAP_LIBC_V(int) sys_nerr;
+ LDAP_LIBC_V(char) *sys_errlist[];
+#endif
+
+#undef _AC_ERRNO_UNKNOWN
+#define _AC_ERRNO_UNKNOWN "unknown error"
+
+#ifdef HAVE_SYS_ERRLIST
+ /* this is thread safe */
+# define STRERROR(e) ( (e) > -1 && (e) < sys_nerr \
+ ? sys_errlist[(e)] : _AC_ERRNO_UNKNOWN )
+
+#elif defined( HAVE_STRERROR )
+ /* this may not be thread safe */
+ /* and, yes, some implementations of strerror may return NULL */
+# define STRERROR(e) ( strerror(e) \
+ ? strerror(e) : _AC_ERRNO_UNKNOWN )
+
+#else
+ /* this is thread safe */
+# define STRERROR(e) ( _AC_ERRNO_UNKNOWN )
#endif
-
-/* use _POSIX_VERSION for POSIX.1 code */
#endif /* _AC_ERRNO_H */