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diff --git a/libguile/print.h b/libguile/print.h
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+++ b/libguile/print.h
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+#ifndef SCM_PRINT_H
+#define SCM_PRINT_H
+
+/* Copyright 1995-1996,1998,2000-2001,2003-2004,2006,2008,2010,2012,2017-2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Guile 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 Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+
+#include "libguile/chars.h"
+#include <libguile/error.h>
+#include <libguile/gc.h>
+#include "libguile/options.h"
+
+
+
+/* State information passed around during printing.
+ */
+#define SCM_PRINT_STATE_P(obj) (SCM_STRUCTP(obj) \
+ && (scm_is_eq (SCM_STRUCT_VTABLE(obj), \
+ scm_print_state_vtable)))
+#define SCM_PRINT_STATE(obj) ((scm_print_state *) SCM_STRUCT_DATA (obj))
+
+#define RESET_PRINT_STATE(pstate) \
+do { \
+ pstate->list_offset = 0; \
+ pstate->top = 0; \
+} while (0)
+
+#define SCM_WRITINGP(pstate) ((pstate)->writingp)
+#define SCM_SET_WRITINGP(pstate, x) { (pstate)->writingp = (x); }
+
+#define SCM_PORT_WITH_PS_P(p) SCM_TYP16_PREDICATE (scm_tc16_port_with_ps, p)
+#define SCM_PORT_WITH_PS_PORT(p) SCM_CELL_OBJECT_1 (p)
+#define SCM_PORT_WITH_PS_PS(p) SCM_CELL_OBJECT_2 (p)
+
+#define SCM_COERCE_OUTPORT(p) \
+ (SCM_PORT_WITH_PS_P (p) ? SCM_PORT_WITH_PS_PORT (p) : p)
+
+#define SCM_VALIDATE_OPORT_VALUE(pos, port) \
+ do { \
+ SCM_ASSERT (scm_valid_oport_value_p (port), port, pos, FUNC_NAME); \
+ } while (0)
+
+#define SCM_VALIDATE_PRINTSTATE(pos, a) \
+ SCM_MAKE_VALIDATE_MSG(pos, a, PRINT_STATE_P, "print-state")
+
+#define SCM_PRINT_STATE_LAYOUT "pwuwuwuwuwuwpwuwuwuwpwpw"
+typedef struct scm_print_state {
+ SCM handle; /* Struct handle */
+ int revealed; /* Has the state escaped to Scheme? */
+ unsigned long writingp; /* Writing? */
+ unsigned long fancyp; /* Fancy printing? */
+ unsigned long level; /* Max level */
+ unsigned long length; /* Max number of objects per level */
+ SCM hot_ref; /* Hot reference */
+ unsigned long list_offset;
+ unsigned long top; /* Top of reference stack */
+ unsigned long ceiling; /* Max size of reference stack */
+ SCM ref_vect; /* Stack of references used during
+ circular reference detection;
+ a simple vector. */
+ SCM highlight_objects; /* List of objects to be highlighted */
+} scm_print_state;
+
+SCM_API SCM scm_print_state_vtable;
+
+SCM_API scm_t_bits scm_tc16_port_with_ps;
+
+SCM_API SCM scm_print_options (SCM setting);
+SCM_API SCM scm_make_print_state (void);
+SCM_API void scm_free_print_state (SCM print_state);
+SCM_INTERNAL SCM scm_i_port_with_print_state (SCM port, SCM print_state);
+SCM_API void scm_intprint (intmax_t n, int radix, SCM port);
+SCM_API void scm_uintprint (uintmax_t n, int radix, SCM port);
+SCM_API void scm_ipruk (char *hdr, SCM ptr, SCM port);
+SCM_API void scm_iprlist (char *hdr, SCM exp, int tlr, SCM port, scm_print_state *pstate);
+SCM_API void scm_print_symbol_name (const char *str, size_t len, SCM port);
+SCM_API void scm_prin1 (SCM exp, SCM port, int writingp);
+SCM_API void scm_iprin1 (SCM exp, SCM port, scm_print_state *pstate);
+SCM_API SCM scm_write (SCM obj, SCM port);
+SCM_API SCM scm_display (SCM obj, SCM port);
+SCM_API SCM scm_simple_format (SCM port, SCM message, SCM args);
+SCM_API SCM scm_newline (SCM port);
+SCM_API SCM scm_write_char (SCM chr, SCM port);
+SCM_API SCM scm_printer_apply (SCM proc, SCM exp, SCM port, scm_print_state *);
+SCM_API SCM scm_port_with_print_state (SCM port, SCM pstate);
+SCM_API SCM scm_get_print_state (SCM port);
+SCM_API int scm_valid_oport_value_p (SCM val);
+SCM_INTERNAL void scm_init_print (void);
+
+#ifdef GUILE_DEBUG
+SCM_API SCM scm_current_pstate (void);
+#endif
+
+#endif /* SCM_PRINT_H */