1 /* Copyright (C) 1995-1999,2000,2001 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
47 #include "libguile/_scm.h"
48 #include "libguile/chars.h"
49 #include "libguile/continuations.h"
50 #include "libguile/smob.h"
51 #include "libguile/eval.h"
52 #include "libguile/macros.h"
53 #include "libguile/procprop.h"
54 #include "libguile/read.h"
55 #include "libguile/weaks.h"
56 #include "libguile/unif.h"
57 #include "libguile/alist.h"
58 #include "libguile/struct.h"
59 #include "libguile/objects.h"
60 #include "libguile/ports.h"
61 #include "libguile/root.h"
62 #include "libguile/strings.h"
63 #include "libguile/strports.h"
64 #include "libguile/vectors.h"
66 #include "libguile/validate.h"
67 #include "libguile/print.h"
70 /* {Names of immediate symbols}
72 * This table must agree with the declarations in scm.h: {Immediate Symbols}.
75 char *scm_isymnames
[] =
77 /* This table must agree with the declarations */
93 "#@literal-variable-ref",
94 "#@literal-variable-set!",
97 "#@call-with-current-continuation",
99 /* user visible ISYMS */
113 /* Multi-language support */
124 "#@call-with-values",
129 scm_t_option scm_print_opts
[] = {
130 { SCM_OPTION_SCM
, "closure-hook", SCM_UNPACK (SCM_BOOL_F
),
131 "Hook for printing closures (should handle macros as well)." },
132 { SCM_OPTION_BOOLEAN
, "source", 0,
133 "Print closures with source." }
136 SCM_DEFINE (scm_print_options
, "print-options-interface", 0, 1, 0,
138 "Option interface for the print options. Instead of using\n"
139 "this procedure directly, use the procedures\n"
140 "@code{print-enable}, @code{print-disable}, @code{print-set!}\n"
141 "and @code{print-options}.")
142 #define FUNC_NAME s_scm_print_options
144 SCM ans
= scm_options (setting
,
153 /* {Printing of Scheme Objects}
156 /* Detection of circular references.
158 * Due to other constraints in the implementation, this code has bad
159 * time complexity (O (depth * N)), The printer code can be
160 * rewritten to be O(N).
162 #define PUSH_REF(pstate, obj) \
164 pstate->ref_stack[pstate->top++] = (obj); \
165 if (pstate->top == pstate->ceiling) \
166 grow_ref_stack (pstate); \
169 #define ENTER_NESTED_DATA(pstate, obj, label) \
171 register unsigned long i; \
172 for (i = 0; i < pstate->top; ++i) \
173 if (SCM_EQ_P (pstate->ref_stack[i], (obj))) \
175 if (pstate->fancyp) \
177 if (pstate->top - pstate->list_offset >= pstate->level) \
179 scm_putc ('#', port); \
183 PUSH_REF(pstate, obj); \
186 #define EXIT_NESTED_DATA(pstate) { --pstate->top; }
188 SCM scm_print_state_vtable
;
190 static SCM print_state_pool
;
192 #ifdef GUILE_DEBUG /* Used for debugging purposes */
194 SCM_DEFINE (scm_current_pstate
, "current-pstate", 0, 0, 0,
196 "Return the current-pstate -- the cadr of the\n"
197 "@code{print_state_pool}. @code{current-pstate} is only\n"
198 "included in @code{--enable-guile-debug} builds.")
199 #define FUNC_NAME s_scm_current_pstate
201 if (SCM_NNULLP (SCM_CDR (print_state_pool
)))
202 return SCM_CADR (print_state_pool
);
210 #define PSTATE_SIZE 50L
213 make_print_state (void)
215 SCM print_state
= scm_make_struct (SCM_CAR (print_state_pool
), /* pstate type */
218 scm_print_state
*pstate
= SCM_PRINT_STATE (print_state
);
219 pstate
->ref_vect
= scm_c_make_vector (PSTATE_SIZE
, SCM_UNDEFINED
);
220 pstate
->ref_stack
= SCM_VELTS (pstate
->ref_vect
);
221 pstate
->ceiling
= SCM_VECTOR_LENGTH (pstate
->ref_vect
);
226 scm_make_print_state ()
228 SCM answer
= SCM_BOOL_F
;
230 /* First try to allocate a print state from the pool */
232 if (SCM_NNULLP (SCM_CDR (print_state_pool
)))
234 answer
= SCM_CADR (print_state_pool
);
235 SCM_SETCDR (print_state_pool
, SCM_CDDR (print_state_pool
));
239 return SCM_FALSEP (answer
) ? make_print_state () : answer
;
243 scm_free_print_state (SCM print_state
)
246 scm_print_state
*pstate
= SCM_PRINT_STATE (print_state
);
247 /* Cleanup before returning print state to pool.
248 * It is better to do it here. Doing it in scm_prin1
249 * would cost more since that function is called much more
253 pstate
->revealed
= 0;
254 SCM_NEWCELL (handle
);
256 SCM_SET_CELL_WORD_0 (handle
, print_state
);
257 SCM_SET_CELL_WORD_1 (handle
, SCM_CDR (print_state_pool
));
258 SCM_SETCDR (print_state_pool
, handle
);
263 grow_ref_stack (scm_print_state
*pstate
)
265 unsigned long int old_size
= SCM_VECTOR_LENGTH (pstate
->ref_vect
);
266 SCM
*old_elts
= SCM_VELTS (pstate
->ref_vect
);
267 unsigned long int new_size
= 2 * pstate
->ceiling
;
268 SCM new_vect
= scm_c_make_vector (new_size
, SCM_UNDEFINED
);
269 SCM
*new_elts
= SCM_VELTS (new_vect
);
272 for (i
= 0; i
!= old_size
; ++i
)
273 new_elts
[i
] = old_elts
[i
];
275 pstate
->ref_vect
= new_vect
;
276 pstate
->ref_stack
= new_elts
;
277 pstate
->ceiling
= new_size
;
282 print_circref (SCM port
,scm_print_state
*pstate
,SCM ref
)
285 long self
= pstate
->top
- 1;
287 if (SCM_CONSP (pstate
->ref_stack
[i
]))
291 if (SCM_NCONSP (pstate
->ref_stack
[i
- 1])
292 || !SCM_EQ_P (SCM_CDR (pstate
->ref_stack
[i
- 1]),
293 pstate
->ref_stack
[i
]))
299 for (i
= pstate
->top
- 1; 1; --i
)
300 if (SCM_EQ_P (pstate
->ref_stack
[i
], ref
))
302 scm_putc ('#', port
);
303 scm_intprint (i
- self
, 10, port
);
304 scm_putc ('#', port
);
307 /* Print the name of a symbol. */
310 scm_print_symbol_name (const char *str
, size_t len
, SCM port
)
322 /* XXX - Lots of weird symbol names are missed, such as "12" or
326 scm_lfwrite ("#{}#", 4, port
);
327 else if (str
[0] == '#' || str
[0] == ':' || str
[len
-1] == ':')
329 scm_lfwrite ("#{", 2, port
);
333 for (end
= pos
; end
< len
; ++end
)
336 #ifdef BRACKETS_AS_PARENS
344 case SCM_WHITE_SPACES
:
345 case SCM_LINE_INCREMENTORS
:
354 scm_lfwrite ("#{", 2, port
);
359 scm_lfwrite (str
+ pos
, end
- pos
, port
);
365 scm_lfwrite (buf
, 2, port
);
387 scm_lfwrite (str
+ pos
, end
- pos
, port
);
389 scm_lfwrite ("}#", 2, port
);
392 /* Print generally. Handles both write and display according to PSTATE.
394 SCM_GPROC(s_write
, "write", 1, 1, 0, scm_write
, g_write
);
395 SCM_GPROC(s_display
, "display", 1, 1, 0, scm_display
, g_display
);
398 scm_iprin1 (SCM exp
, SCM port
, scm_print_state
*pstate
)
400 switch (SCM_ITAG3 (exp
))
402 case scm_tc3_closure
:
405 /* These tc3 tags should never occur in an immediate value. They are
406 * only used in cell types of non-immediates, i. e. the value returned
407 * by SCM_CELL_TYPE (exp) can use these tags.
409 scm_ipruk ("immediate", exp
, port
);
413 scm_intprint (SCM_INUM (exp
), 10, port
);
418 long i
= SCM_CHAR (exp
);
420 if (SCM_WRITINGP (pstate
))
422 scm_puts ("#\\", port
);
423 if ((i
>= 0) && (i
<= ' ') && scm_charnames
[i
])
424 scm_puts (scm_charnames
[i
], port
);
426 else if (i
== '\177')
427 scm_puts (scm_charnames
[scm_n_charnames
- 1], port
);
429 else if (i
< 0 || i
> '\177')
430 scm_intprint (i
, 8, port
);
437 else if (SCM_IFLAGP (exp
)
438 && ((size_t) SCM_ISYMNUM (exp
) < (sizeof scm_isymnames
/ sizeof (char *))))
439 scm_puts (SCM_ISYMCHARS (exp
), port
);
440 else if (SCM_ILOCP (exp
))
442 scm_puts ("#@", port
);
443 scm_intprint ((long) SCM_IFRAME (exp
), 10, port
);
444 scm_putc (SCM_ICDRP (exp
) ? '-' : '+', port
);
445 scm_intprint ((long) SCM_IDIST (exp
), 10, port
);
449 /* unknown immediate value */
450 scm_ipruk ("immediate", exp
, port
);
454 switch (SCM_TYP7 (exp
))
458 ENTER_NESTED_DATA (pstate
, exp
, circref
);
459 if (SCM_OBJ_CLASS_FLAGS (exp
) & SCM_CLASSF_GOOPS
)
461 SCM pwps
, print
= pstate
->writingp
? g_write
: g_display
;
465 scm_tc16_port_with_ps
,
466 SCM_UNPACK (scm_cons (port
, pstate
->handle
)));
467 scm_call_generic_2 (print
, exp
, pwps
);
472 scm_print_struct (exp
, port
, pstate
);
474 EXIT_NESTED_DATA (pstate
);
477 case scm_tcs_cons_imcar
:
478 case scm_tcs_cons_nimcar
:
479 ENTER_NESTED_DATA (pstate
, exp
, circref
);
480 scm_iprlist ("(", exp
, ')', port
, pstate
);
481 EXIT_NESTED_DATA (pstate
);
484 print_circref (port
, pstate
, exp
);
486 case scm_tcs_closures
:
487 if (SCM_FALSEP (scm_procedure_p (SCM_PRINT_CLOSURE
))
488 || SCM_FALSEP (scm_printer_apply (SCM_PRINT_CLOSURE
,
491 SCM formals
= SCM_CLOSURE_FORMALS (exp
);
492 scm_puts ("#<procedure", port
);
493 scm_putc (' ', port
);
494 scm_iprin1 (scm_procedure_name (exp
), port
, pstate
);
495 scm_putc (' ', port
);
496 if (SCM_PRINT_SOURCE_P
)
498 SCM env
= SCM_ENV (exp
);
499 SCM xenv
= SCM_EXTEND_ENV (formals
, SCM_EOL
, env
);
500 SCM src
= scm_unmemocopy (SCM_CODE (exp
), xenv
);
501 ENTER_NESTED_DATA (pstate
, exp
, circref
);
502 scm_iprin1 (src
, port
, pstate
);
503 EXIT_NESTED_DATA (pstate
);
506 scm_iprin1 (formals
, port
, pstate
);
507 scm_putc ('>', port
);
510 case scm_tc7_substring
:
512 if (SCM_WRITINGP (pstate
))
516 scm_putc ('"', port
);
517 for (i
= 0; i
< SCM_STRING_LENGTH (exp
); ++i
)
518 switch (SCM_STRING_CHARS (exp
)[i
])
522 scm_putc ('\\', port
);
524 scm_putc (SCM_STRING_CHARS (exp
)[i
], port
);
526 scm_putc ('"', port
);
530 scm_lfwrite (SCM_STRING_CHARS (exp
), SCM_STRING_LENGTH (exp
), port
);
533 scm_print_symbol_name (SCM_SYMBOL_CHARS (exp
),
534 SCM_SYMBOL_LENGTH (exp
),
536 scm_remember_upto_here_1 (exp
);
538 case scm_tc7_variable
:
539 scm_i_variable_print (exp
, port
, pstate
);
542 ENTER_NESTED_DATA (pstate
, exp
, circref
);
543 if (SCM_IS_WHVEC (exp
))
544 scm_puts ("#wh(", port
);
546 scm_puts ("#w(", port
);
547 goto common_vector_printer
;
550 ENTER_NESTED_DATA (pstate
, exp
, circref
);
551 scm_puts ("#(", port
);
552 common_vector_printer
:
555 long last
= SCM_VECTOR_LENGTH (exp
) - 1;
557 if (pstate
->fancyp
&& SCM_VECTOR_LENGTH (exp
) > pstate
->length
)
559 last
= pstate
->length
- 1;
562 for (i
= 0; i
< last
; ++i
)
565 scm_iprin1 (SCM_VELTS (exp
)[i
], port
, pstate
);
566 scm_putc (' ', port
);
571 scm_iprin1 (SCM_VELTS (exp
)[i
], port
, pstate
);
574 scm_puts (" ...", port
);
575 scm_putc (')', port
);
577 EXIT_NESTED_DATA (pstate
);
588 #ifdef HAVE_LONG_LONGS
591 scm_raprin1 (exp
, port
, pstate
);
595 scm_puts (SCM_SUBR_GENERIC (exp
) && *SCM_SUBR_GENERIC (exp
)
596 ? "#<primitive-generic "
597 : "#<primitive-procedure ",
599 scm_puts (SCM_SYMBOL_CHARS (SCM_SNAME (exp
)), port
);
600 scm_putc ('>', port
);
605 SCM proc
= SCM_CCLO_SUBR (exp
);
606 if (SCM_EQ_P (proc
, scm_f_gsubr_apply
))
608 /* Print gsubrs as primitives */
609 SCM name
= scm_procedure_name (exp
);
610 scm_puts ("#<primitive-procedure", port
);
611 if (SCM_NFALSEP (name
))
613 scm_putc (' ', port
);
614 scm_puts (SCM_SYMBOL_CHARS (name
), port
);
619 scm_puts ("#<compiled-closure ", port
);
620 scm_iprin1 (proc
, port
, pstate
);
622 scm_putc ('>', port
);
627 scm_puts ("#<procedure-with-setter", port
);
629 SCM name
= scm_procedure_name (exp
);
630 if (SCM_NFALSEP (name
))
632 scm_putc (' ', port
);
633 scm_display (name
, port
);
636 scm_putc ('>', port
);
640 register long i
= SCM_PTOBNUM (exp
);
642 && scm_ptobs
[i
].print
643 && (scm_ptobs
[i
].print
) (exp
, port
, pstate
))
648 ENTER_NESTED_DATA (pstate
, exp
, circref
);
649 SCM_SMOB_DESCRIPTOR (exp
).print (exp
, port
, pstate
);
650 EXIT_NESTED_DATA (pstate
);
654 scm_ipruk ("type", exp
, port
);
659 /* Print states are necessary for circular reference safe printing.
660 * They are also expensive to allocate. Therefore print states are
661 * kept in a pool so that they can be reused.
664 /* The PORT argument can also be a print-state/port pair, which will
665 * then be used instead of allocating a new print state. This is
666 * useful for continuing a chain of print calls from Scheme. */
669 scm_prin1 (SCM exp
, SCM port
, int writingp
)
671 SCM handle
= SCM_BOOL_F
; /* Will GC protect the handle whilst unlinked */
673 scm_print_state
*pstate
;
675 /* If PORT is a print-state/port pair, use that. Else create a new
678 if (SCM_PORT_WITH_PS_P (port
))
680 pstate_scm
= SCM_PORT_WITH_PS_PS (port
);
681 port
= SCM_PORT_WITH_PS_PORT (port
);
685 /* First try to allocate a print state from the pool */
687 if (SCM_NNULLP (SCM_CDR (print_state_pool
)))
689 handle
= SCM_CDR (print_state_pool
);
690 SCM_SETCDR (print_state_pool
, SCM_CDDR (print_state_pool
));
693 if (SCM_FALSEP (handle
))
694 handle
= scm_cons (make_print_state (), SCM_EOL
);
695 pstate_scm
= SCM_CAR (handle
);
698 pstate
= SCM_PRINT_STATE (pstate_scm
);
699 pstate
->writingp
= writingp
;
700 scm_iprin1 (exp
, port
, pstate
);
702 /* Return print state to pool if it has been created above and
703 hasn't escaped to Scheme. */
705 if (!SCM_FALSEP (handle
) && !pstate
->revealed
)
708 SCM_SETCDR (handle
, SCM_CDR (print_state_pool
));
709 SCM_SETCDR (print_state_pool
, handle
);
719 scm_intprint (long n
, int radix
, SCM port
)
721 char num_buf
[SCM_INTBUFLEN
];
722 scm_lfwrite (num_buf
, scm_iint2str (n
, radix
, num_buf
), port
);
725 /* Print an object of unrecognized type.
729 scm_ipruk (char *hdr
, SCM ptr
, SCM port
)
731 scm_puts ("#<unknown-", port
);
732 scm_puts (hdr
, port
);
735 scm_puts (" (0x", port
);
736 scm_intprint (SCM_CELL_WORD_0 (ptr
), 16, port
);
737 scm_puts (" . 0x", port
);
738 scm_intprint (SCM_CELL_WORD_1 (ptr
), 16, port
);
739 scm_puts (") @", port
);
741 scm_puts (" 0x", port
);
742 scm_intprint (SCM_UNPACK (ptr
), 16, port
);
743 scm_putc ('>', port
);
750 scm_iprlist (char *hdr
,SCM exp
,int tlr
,SCM port
,scm_print_state
*pstate
)
752 register SCM hare
, tortoise
;
753 long floor
= pstate
->top
- 2;
754 scm_puts (hdr
, port
);
759 /* Run a hare and tortoise so that total time complexity will be
760 O(depth * N) instead of O(N^2). */
761 hare
= SCM_CDR (exp
);
763 while (SCM_CONSP (hare
))
765 if (SCM_EQ_P (hare
, tortoise
))
767 hare
= SCM_CDR (hare
);
768 if (SCM_IMP (hare
) || SCM_NCONSP (hare
))
770 hare
= SCM_CDR (hare
);
771 tortoise
= SCM_CDR (tortoise
);
774 /* No cdr cycles intrinsic to this list */
775 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
776 for (exp
= SCM_CDR (exp
); SCM_CONSP (exp
); exp
= SCM_CDR (exp
))
780 for (i
= floor
; i
>= 0; --i
)
781 if (SCM_EQ_P (pstate
->ref_stack
[i
], exp
))
783 PUSH_REF (pstate
, exp
);
784 scm_putc (' ', port
);
786 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
788 if (!SCM_NULLP (exp
))
790 scm_puts (" . ", port
);
791 scm_iprin1 (exp
, port
, pstate
);
795 scm_putc (tlr
, port
);
796 pstate
->top
= floor
+ 2;
801 long n
= pstate
->length
;
803 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
804 exp
= SCM_CDR (exp
); --n
;
805 for (; SCM_CONSP (exp
); exp
= SCM_CDR (exp
))
807 register unsigned long i
;
809 for (i
= 0; i
< pstate
->top
; ++i
)
810 if (SCM_EQ_P (pstate
->ref_stack
[i
], exp
))
816 scm_puts (" ...", port
);
822 PUSH_REF(pstate
, exp
);
823 ++pstate
->list_offset
;
824 scm_putc (' ', port
);
826 scm_iprin1 (SCM_CAR (exp
), port
, pstate
);
829 if (SCM_NNULLP (exp
))
831 scm_puts (" . ", port
);
832 scm_iprin1 (exp
, port
, pstate
);
835 pstate
->list_offset
-= pstate
->top
- floor
- 2;
839 pstate
->list_offset
-= pstate
->top
- floor
- 2;
842 scm_puts (" . ", port
);
843 print_circref (port
, pstate
, exp
);
850 scm_valid_oport_value_p (SCM val
)
852 return (SCM_OPOUTPORTP (val
)
853 || (SCM_PORT_WITH_PS_P (val
)
854 && SCM_OPOUTPORTP (SCM_PORT_WITH_PS_PORT (val
))));
857 /* SCM_GPROC(s_write, "write", 1, 1, 0, scm_write, g_write); */
860 scm_write (SCM obj
, SCM port
)
862 if (SCM_UNBNDP (port
))
865 SCM_ASSERT (scm_valid_oport_value_p (port
), port
, SCM_ARG2
, s_write
);
867 scm_prin1 (obj
, port
, 1);
871 scm_close_port (port
);
874 return SCM_UNSPECIFIED
;
878 /* SCM_GPROC(s_display, "display", 1, 1, 0, scm_display, g_display); */
881 scm_display (SCM obj
, SCM port
)
883 if (SCM_UNBNDP (port
))
886 SCM_ASSERT (scm_valid_oport_value_p (port
), port
, SCM_ARG2
, s_display
);
888 scm_prin1 (obj
, port
, 0);
892 scm_close_port (port
);
895 return SCM_UNSPECIFIED
;
899 SCM_DEFINE (scm_simple_format
, "simple-format", 2, 0, 1,
900 (SCM destination
, SCM message
, SCM args
),
901 "Write @var{message} to @var{destination}, defaulting to\n"
902 "the current output port.\n"
903 "@var{message} can contain @code{~A} (was @code{%s}) and\n"
904 "@code{~S} (was @code{%S}) escapes. When printed,\n"
905 "the escapes are replaced with corresponding members of\n"
907 "@code{~A} formats using @code{display} and @code{~S} formats\n"
908 "using @code{write}.\n"
909 "If @var{destination} is @code{#t}, then use the current output\n"
910 "port, if @var{destination} is @code{#f}, then return a string\n"
911 "containing the formatted text. Does not add a trailing newline.")
912 #define FUNC_NAME s_scm_simple_format
914 SCM answer
= SCM_UNSPECIFIED
;
915 int fReturnString
= 0;
921 if (SCM_EQ_P (destination
, SCM_BOOL_T
))
923 destination
= scm_cur_outp
;
925 else if (SCM_FALSEP (destination
))
928 destination
= scm_mkstrport (SCM_INUM0
,
929 scm_make_string (SCM_INUM0
, SCM_UNDEFINED
),
935 SCM_VALIDATE_OPORT_VALUE (1, destination
);
936 destination
= SCM_COERCE_OUTPORT (destination
);
938 SCM_VALIDATE_STRING (2, message
);
939 SCM_VALIDATE_REST_ARGUMENT (args
);
941 start
= SCM_STRING_CHARS (message
);
942 end
= start
+ SCM_STRING_LENGTH (message
);
943 for (p
= start
; p
!= end
; ++p
)
958 scm_lfwrite (start
, p
- start
, destination
);
962 scm_newline (destination
);
966 SCM_MISC_ERROR ("FORMAT: Unsupported format option ~~~A - use (ice-9 format) instead",
967 scm_list_1 (SCM_MAKE_CHAR (*p
)));
972 if (!SCM_CONSP (args
))
973 SCM_MISC_ERROR ("FORMAT: Missing argument for ~~~A",
974 scm_list_1 (SCM_MAKE_CHAR (*p
)));
976 scm_lfwrite (start
, p
- start
- 1, destination
);
977 scm_prin1 (SCM_CAR (args
), destination
, writingp
);
978 args
= SCM_CDR (args
);
982 scm_lfwrite (start
, p
- start
, destination
);
984 SCM_MISC_ERROR ("FORMAT: ~A superfluous arguments",
985 scm_list_1 (scm_length (args
)));
988 answer
= scm_strport_to_string (destination
);
990 return scm_return_first (answer
, message
);
995 SCM_DEFINE (scm_newline
, "newline", 0, 1, 0,
997 "Send a newline to @var{port}.")
998 #define FUNC_NAME s_scm_newline
1000 if (SCM_UNBNDP (port
))
1001 port
= scm_cur_outp
;
1003 SCM_VALIDATE_OPORT_VALUE (1,port
);
1005 scm_putc ('\n', SCM_COERCE_OUTPORT (port
));
1006 return SCM_UNSPECIFIED
;
1010 SCM_DEFINE (scm_write_char
, "write-char", 1, 1, 0,
1011 (SCM chr
, SCM port
),
1012 "Send character @var{chr} to @var{port}.")
1013 #define FUNC_NAME s_scm_write_char
1015 if (SCM_UNBNDP (port
))
1016 port
= scm_cur_outp
;
1018 SCM_VALIDATE_CHAR (1,chr
);
1019 SCM_VALIDATE_OPORT_VALUE (2,port
);
1021 scm_putc ((int) SCM_CHAR (chr
), SCM_COERCE_OUTPORT (port
));
1025 scm_close_port (port
);
1028 return SCM_UNSPECIFIED
;
1034 /* Call back to Scheme code to do the printing of special objects
1035 * (like structs). SCM_PRINTER_APPLY applies PROC to EXP and a smob
1036 * containing PORT and PSTATE. This object can be used as the port for
1037 * display/write etc to continue the current print chain. The REVEALED
1038 * field of PSTATE is set to true to indicate that the print state has
1039 * escaped to Scheme and thus has to be freed by the GC.
1042 scm_t_bits scm_tc16_port_with_ps
;
1044 /* Print exactly as the port itself would */
1047 port_with_ps_print (SCM obj
, SCM port
, scm_print_state
*pstate
)
1049 obj
= SCM_PORT_WITH_PS_PORT (obj
);
1050 return scm_ptobs
[SCM_PTOBNUM (obj
)].print (obj
, port
, pstate
);
1054 scm_printer_apply (SCM proc
, SCM exp
, SCM port
, scm_print_state
*pstate
)
1057 SCM pair
= scm_cons (port
, pstate
->handle
);
1058 SCM_NEWSMOB (pwps
, scm_tc16_port_with_ps
, SCM_UNPACK (pair
));
1059 pstate
->revealed
= 1;
1060 return scm_call_2 (proc
, exp
, pwps
);
1063 SCM_DEFINE (scm_port_with_print_state
, "port-with-print-state", 2, 0, 0,
1064 (SCM port
, SCM pstate
),
1065 "Create a new port which behaves like @var{port}, but with an\n"
1066 "included print state @var{pstate}.")
1067 #define FUNC_NAME s_scm_port_with_print_state
1070 SCM_VALIDATE_OPORT_VALUE (1,port
);
1071 SCM_VALIDATE_PRINTSTATE (2,pstate
);
1072 port
= SCM_COERCE_OUTPORT (port
);
1073 SCM_NEWSMOB (pwps
, scm_tc16_port_with_ps
, SCM_UNPACK (scm_cons (port
, pstate
)));
1078 SCM_DEFINE (scm_get_print_state
, "get-print-state", 1, 0, 0,
1080 "Return the print state of the port @var{port}. If @var{port}\n"
1081 "has no associated print state, @code{#f} is returned.")
1082 #define FUNC_NAME s_scm_get_print_state
1084 if (SCM_PORT_WITH_PS_P (port
))
1085 return SCM_PORT_WITH_PS_PS (port
);
1086 if (SCM_OUTPUT_PORT_P (port
))
1088 SCM_WRONG_TYPE_ARG (1, port
);
1097 SCM vtable
, layout
, type
;
1099 scm_init_opts (scm_print_options
, scm_print_opts
, SCM_N_PRINT_OPTIONS
);
1100 vtable
= scm_make_vtable_vtable (scm_nullstr
, SCM_INUM0
, SCM_EOL
);
1101 layout
= scm_make_struct_layout (scm_makfrom0str (SCM_PRINT_STATE_LAYOUT
));
1102 type
= scm_make_struct (vtable
, SCM_INUM0
, scm_list_1 (layout
));
1103 scm_set_struct_vtable_name_x (type
, scm_str2symbol ("print-state"));
1104 print_state_pool
= scm_permanent_object (scm_cons (type
, SCM_EOL
));
1106 scm_print_state_vtable
= type
;
1108 /* Don't want to bind a wrapper class in GOOPS, so pass 0 as arg1. */
1109 scm_tc16_port_with_ps
= scm_make_smob_type (0, 0);
1110 scm_set_smob_mark (scm_tc16_port_with_ps
, scm_markcdr
);
1111 scm_set_smob_print (scm_tc16_port_with_ps
, port_with_ps_print
);
1113 #ifndef SCM_MAGIC_SNARFER
1114 #include "libguile/print.x"