diff --git a/ap/libc/glibc/glibc-2.23/mach/errstring.c b/ap/libc/glibc/glibc-2.23/mach/errstring.c
new file mode 100644
index 0000000..52cf1eb
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/mach/errstring.c
@@ -0,0 +1,96 @@
+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * (pre-GNU) HISTORY
+ *
+ * Revision 2.3  92/04/01  19:38:18  rpd
+ * 	Updated do_compat for kernel device errors,
+ * 	bootstrap file-system errors.
+ * 	[92/03/09            rpd]
+ *
+ * Revision 2.2  92/02/20  15:58:08  elf
+ * 	Created from mach_error.c.
+ * 	[92/02/11            rpd]
+ *
+ */
+
+#define EXPORT_BOOLEAN
+#include <mach/boolean.h>
+#include <mach/error.h>
+#include <mach_error.h>
+#include <errorlib.h>
+
+extern void __mach_error_map_compat (mach_error_t *);
+
+const char *
+mach_error_type( err )
+	mach_error_t		err;
+{
+	int sub, system;
+
+	__mach_error_map_compat( &err );
+
+	sub = err_get_sub(err);
+	system = err_get_system(err);
+
+	if (system > err_max_system
+	||  sub >= errors[system].max_sub ) return( "(?/?)" );
+	return( errors[system].subsystem[sub].subsys_name );
+}
+
+boolean_t mach_error_full_diag = FALSE;
+
+const char *
+mach_error_string_int(mach_error_t	err,
+		      boolean_t		* diag)
+{
+	int sub, system, code;
+
+	__mach_error_map_compat( &err );
+
+	sub = err_get_sub(err);
+	system = err_get_system(err);
+	code = err_get_code(err);
+
+	*diag = TRUE;
+
+	if (system > err_max_system) return( "(?/?) unknown error system" );
+	if (sub >= errors[system].max_sub) return( errors[system].bad_sub );
+	if (code >= errors[system].subsystem[sub].max_code) return ( NO_SUCH_ERROR );
+
+	*diag = mach_error_full_diag;
+	return( errors[system].subsystem[sub].codes[code] );
+}
+
+const char *
+mach_error_string( err )
+	mach_error_t		err;
+{
+	boolean_t diag;
+
+	return mach_error_string_int( err, &diag );
+
+}