print.c 37.6 KB
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/* Lisp object printing and output streams.
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   Copyright (C) 1985, 86, 88, 93, 94, 95 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.

GNU Emacs 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
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#include <config.h>
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#include <stdio.h>
#include "lisp.h"

#ifndef standalone
#include "buffer.h"
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#include "frame.h"
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#include "window.h"
#include "process.h"
#include "dispextern.h"
#include "termchar.h"
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#include "keyboard.h"
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#endif /* not standalone */

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#ifdef USE_TEXT_PROPERTIES
#include "intervals.h"
#endif

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Lisp_Object Vstandard_output, Qstandard_output;

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/* These are used to print like we read.  */
extern Lisp_Object Qbackquote, Qcomma, Qcomma_at, Qcomma_dot, Qfunction;

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#ifdef LISP_FLOAT_TYPE
Lisp_Object Vfloat_output_format, Qfloat_output_format;
#endif /* LISP_FLOAT_TYPE */

/* Avoid actual stack overflow in print.  */
int print_depth;

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/* Detect most circularities to print finite output.  */
#define PRINT_CIRCLE 200
Lisp_Object being_printed[PRINT_CIRCLE];

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/* When printing into a buffer, first we put the text in this
   block, then insert it all at once.  */
char *print_buffer;

/* Size allocated in print_buffer.  */
int print_buffer_size;
/* Size used in print_buffer.  */
int print_buffer_pos;

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/* Maximum length of list to print in full; noninteger means
   effectively infinity */

Lisp_Object Vprint_length;

/* Maximum depth of list to print in full; noninteger means
   effectively infinity.  */

Lisp_Object Vprint_level;

/* Nonzero means print newlines in strings as \n.  */

int print_escape_newlines;

Lisp_Object Qprint_escape_newlines;

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/* Nonzero means print (quote foo) forms as 'foo, etc.  */

int print_quoted;

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/* Nonzero means print #: before uninterned symbols.  */

int print_gensym;

/* Association list of certain objects that are `eq' in the form being
   printed and which should be `eq' when read back in, using the #n=object
   and #n# reader forms.  Each element has the form (object . n).  */

Lisp_Object printed_gensyms;
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/* Nonzero means print newline to stdout before next minibuffer message.
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   Defined in xdisp.c */

extern int noninteractive_need_newline;
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#ifdef MAX_PRINT_CHARS
static int print_chars;
static int max_print;
#endif /* MAX_PRINT_CHARS */
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void print_interval ();
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#if 0
/* Convert between chars and GLYPHs */

int
glyphlen (glyphs)
     register GLYPH *glyphs;
{
  register int i = 0;

  while (glyphs[i])
    i++;
  return i;
}

void
str_to_glyph_cpy (str, glyphs)
     char *str;
     GLYPH *glyphs;
{
  register GLYPH *gp = glyphs;
  register char *cp = str;

  while (*cp)
    *gp++ = *cp++;
}

void
str_to_glyph_ncpy (str, glyphs, n)
     char *str;
     GLYPH *glyphs;
     register int n;
{
  register GLYPH *gp = glyphs;
  register char *cp = str;

  while (n-- > 0)
    *gp++ = *cp++;
}

void
glyph_to_str_cpy (glyphs, str)
     GLYPH *glyphs;
     char *str;
{
  register GLYPH *gp = glyphs;
  register char *cp = str;

  while (*gp)
    *str++ = *gp++ & 0377;
}
#endif

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/* Low level output routines for characters and strings */
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/* Lisp functions to do output using a stream
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   must have the stream in a variable called printcharfun
   and must start with PRINTPREPARE, end with PRINTFINISH,
   and use PRINTDECLARE to declare common variables.
   Use PRINTCHAR to output one character,
   or call strout to output a block of characters.
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*/ 

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#define PRINTDECLARE						\
   struct buffer *old = current_buffer;				\
   int old_point = -1, start_point;				\
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   int specpdl_count = specpdl_ptr - specpdl;			\
   int free_print_buffer = 0;					\
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   Lisp_Object original

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#define PRINTPREPARE						\
   original = printcharfun;					\
   if (NILP (printcharfun)) printcharfun = Qt;			\
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   if (BUFFERP (printcharfun))					\
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     {								\
       if (XBUFFER (printcharfun) != current_buffer)		\
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	 Fset_buffer (printcharfun);				\
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       printcharfun = Qnil;					\
     }								\
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   if (MARKERP (printcharfun))					\
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     {								\
       if (!(XMARKER (original)->buffer))			\
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         error ("Marker does not point anywhere");		\
       if (XMARKER (original)->buffer != current_buffer)	\
         set_buffer_internal (XMARKER (original)->buffer);	\
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       old_point = PT;						\
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       SET_PT (marker_position (printcharfun));			\
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       start_point = PT;					\
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       printcharfun = Qnil;					\
     }								\
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   if (NILP (printcharfun))					\
     {								\
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       if (print_buffer != 0)					\
	 record_unwind_protect (print_unwind,			\
				make_string (print_buffer,	\
					     print_buffer_pos)); \
       else							\
	 {							\
           print_buffer_size = 1000;				\
           print_buffer = (char *) xmalloc (print_buffer_size);	\
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	   free_print_buffer = 1;				\
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	 }							\
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       print_buffer_pos = 0;					\
     }								\
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   printed_gensyms = Qnil
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#define PRINTFINISH					\
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   if (NILP (printcharfun))				\
     insert (print_buffer, print_buffer_pos);		\
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   if (free_print_buffer)				\
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     {							\
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       xfree (print_buffer);				\
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       print_buffer = 0;				\
     }							\
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   unbind_to (specpdl_count, Qnil);			\
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   if (MARKERP (original))				\
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     Fset_marker (original, make_number (PT), Qnil);	\
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   if (old_point >= 0)					\
     SET_PT (old_point + (old_point >= start_point	\
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			  ? PT - start_point : 0));	\
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   if (old != current_buffer)				\
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     set_buffer_internal (old);				\
   printed_gensyms = Qnil
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#define PRINTCHAR(ch) printchar (ch, printcharfun)

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/* Nonzero if there is no room to print any more characters
   so print might as well return right away.  */

#define PRINTFULLP()					\
 (EQ (printcharfun, Qt) && !noninteractive		\
  && printbufidx >= FRAME_WIDTH (XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)))))

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/* This is used to restore the saved contents of print_buffer
   when there is a recursive call to print.  */
static Lisp_Object
print_unwind (saved_text)
     Lisp_Object saved_text;
{
  bcopy (XSTRING (saved_text)->data, print_buffer, XSTRING (saved_text)->size);
}

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/* Index of first unused element of FRAME_MESSAGE_BUF (mini_frame). */
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static int printbufidx;

static void
printchar (ch, fun)
     unsigned char ch;
     Lisp_Object fun;
{
  Lisp_Object ch1;

#ifdef MAX_PRINT_CHARS
  if (max_print)
    print_chars++;
#endif /* MAX_PRINT_CHARS */
#ifndef standalone
  if (EQ (fun, Qnil))
    {
      QUIT;
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      if (print_buffer_pos == print_buffer_size)
	print_buffer = (char *) xrealloc (print_buffer,
					  print_buffer_size *= 2);
      print_buffer[print_buffer_pos++] = ch;
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      return;
    }

  if (EQ (fun, Qt))
    {
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      FRAME_PTR mini_frame
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	= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));

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      QUIT;

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      if (noninteractive)
	{
	  putchar (ch);
	  noninteractive_need_newline = 1;
	  return;
	}

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      if (echo_area_glyphs != FRAME_MESSAGE_BUF (mini_frame)
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	  || !message_buf_print)
	{
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	  message_log_maybe_newline ();
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	  echo_area_glyphs = FRAME_MESSAGE_BUF (mini_frame);
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	  printbufidx = 0;
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	  echo_area_glyphs_length = 0;
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	  message_buf_print = 1;
	}

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      message_dolog (&ch, 1, 0);
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      if (printbufidx < FRAME_WIDTH (mini_frame) - 1)
	FRAME_MESSAGE_BUF (mini_frame)[printbufidx++] = ch;
      FRAME_MESSAGE_BUF (mini_frame)[printbufidx] = 0;
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      echo_area_glyphs_length = printbufidx;
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      return;
    }
#endif /* not standalone */

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  XSETFASTINT (ch1, ch);
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  call1 (fun, ch1);
}

static void
strout (ptr, size, printcharfun)
     char *ptr;
     int size;
     Lisp_Object printcharfun;
{
  int i = 0;

  if (EQ (printcharfun, Qnil))
    {
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      if (size < 0)
	size = strlen (ptr);

      if (print_buffer_pos + size > print_buffer_size)
	{
	  print_buffer_size = print_buffer_size * 2 + size;
	  print_buffer = (char *) xrealloc (print_buffer,
					    print_buffer_size);
	}
      bcopy (ptr, print_buffer + print_buffer_pos, size);
      print_buffer_pos += size;

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#ifdef MAX_PRINT_CHARS
      if (max_print)
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        print_chars += size;
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#endif /* MAX_PRINT_CHARS */
      return;
    }
  if (EQ (printcharfun, Qt))
    {
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      FRAME_PTR mini_frame
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	= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));

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      QUIT;

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      i = size >= 0 ? size : strlen (ptr);
#ifdef MAX_PRINT_CHARS
      if (max_print)
        print_chars += i;
#endif /* MAX_PRINT_CHARS */

      if (noninteractive)
	{
	  fwrite (ptr, 1, i, stdout);
	  noninteractive_need_newline = 1;
	  return;
	}

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      if (echo_area_glyphs != FRAME_MESSAGE_BUF (mini_frame)
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	  || !message_buf_print)
	{
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	  message_log_maybe_newline ();
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	  echo_area_glyphs = FRAME_MESSAGE_BUF (mini_frame);
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	  printbufidx = 0;
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	  echo_area_glyphs_length = 0;
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	  message_buf_print = 1;
	}

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      message_dolog (ptr, i, 0);
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      if (i > FRAME_WIDTH (mini_frame) - printbufidx - 1)
	i = FRAME_WIDTH (mini_frame) - printbufidx - 1;
      bcopy (ptr, &FRAME_MESSAGE_BUF (mini_frame) [printbufidx], i);
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      printbufidx += i;
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      echo_area_glyphs_length = printbufidx;
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      FRAME_MESSAGE_BUF (mini_frame) [printbufidx] = 0;
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      return;
    }

  if (size >= 0)
    while (i < size)
      PRINTCHAR (ptr[i++]);
  else
    while (ptr[i])
      PRINTCHAR (ptr[i++]);
}

/* Print the contents of a string STRING using PRINTCHARFUN.
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   It isn't safe to use strout in many cases,
   because printing one char can relocate.  */
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print_string (string, printcharfun)
     Lisp_Object string;
     Lisp_Object printcharfun;
{
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  if (EQ (printcharfun, Qt) || NILP (printcharfun))
    /* strout is safe for output to a frame (echo area) or to print_buffer.  */
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    strout (XSTRING (string)->data, XSTRING (string)->size, printcharfun);
  else
    {
      /* Otherwise, fetch the string address for each character.  */
      int i;
      int size = XSTRING (string)->size;
      struct gcpro gcpro1;
      GCPRO1 (string);
      for (i = 0; i < size; i++)
	PRINTCHAR (XSTRING (string)->data[i]);
      UNGCPRO;
    }
}

DEFUN ("write-char", Fwrite_char, Swrite_char, 1, 2, 0,
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  "Output character CHARACTER to stream PRINTCHARFUN.\n\
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PRINTCHARFUN defaults to the value of `standard-output' (which see).")
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  (character, printcharfun)
     Lisp_Object character, printcharfun;
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{
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  PRINTDECLARE;
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  if (NILP (printcharfun))
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    printcharfun = Vstandard_output;
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  CHECK_NUMBER (character, 0);
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  PRINTPREPARE;
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  PRINTCHAR (XINT (character));
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  PRINTFINISH;
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  return character;
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}

/* Used from outside of print.c to print a block of SIZE chars at DATA
   on the default output stream.
   Do not use this on the contents of a Lisp string.  */

write_string (data, size)
     char *data;
     int size;
{
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  PRINTDECLARE;
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  Lisp_Object printcharfun;

  printcharfun = Vstandard_output;

  PRINTPREPARE;
  strout (data, size, printcharfun);
  PRINTFINISH;
}

/* Used from outside of print.c to print a block of SIZE chars at DATA
   on a specified stream PRINTCHARFUN.
   Do not use this on the contents of a Lisp string.  */

write_string_1 (data, size, printcharfun)
     char *data;
     int size;
     Lisp_Object printcharfun;
{
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  PRINTDECLARE;
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  PRINTPREPARE;
  strout (data, size, printcharfun);
  PRINTFINISH;
}


#ifndef standalone

void
temp_output_buffer_setup (bufname)
    char *bufname;
{
  register struct buffer *old = current_buffer;
  register Lisp_Object buf;

  Fset_buffer (Fget_buffer_create (build_string (bufname)));

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  current_buffer->directory = old->directory;
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  current_buffer->read_only = Qnil;
  Ferase_buffer ();

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  XSETBUFFER (buf, current_buffer);
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  specbind (Qstandard_output, buf);

  set_buffer_internal (old);
}

Lisp_Object
internal_with_output_to_temp_buffer (bufname, function, args)
     char *bufname;
     Lisp_Object (*function) ();
     Lisp_Object args;
{
  int count = specpdl_ptr - specpdl;
  Lisp_Object buf, val;
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  struct gcpro gcpro1;
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  GCPRO1 (args);
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  record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
  temp_output_buffer_setup (bufname);
  buf = Vstandard_output;
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  UNGCPRO;
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  val = (*function) (args);

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  GCPRO1 (val);
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  temp_output_buffer_show (buf);
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  UNGCPRO;
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  return unbind_to (count, val);
}

DEFUN ("with-output-to-temp-buffer", Fwith_output_to_temp_buffer, Swith_output_to_temp_buffer,
       1, UNEVALLED, 0,
  "Bind `standard-output' to buffer BUFNAME, eval BODY, then show that buffer.\n\
The buffer is cleared out initially, and marked as unmodified when done.\n\
All output done by BODY is inserted in that buffer by default.\n\
The buffer is displayed in another window, but not selected.\n\
The value of the last form in BODY is returned.\n\
If BODY does not finish normally, the buffer BUFNAME is not displayed.\n\n\
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If variable `temp-buffer-show-function' is non-nil, call it at the end\n\
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to get the buffer displayed.  It gets one argument, the buffer to display.")
  (args)
     Lisp_Object args;
{
  struct gcpro gcpro1;
  Lisp_Object name;
  int count = specpdl_ptr - specpdl;
  Lisp_Object buf, val;

  GCPRO1(args);
  name = Feval (Fcar (args));
  UNGCPRO;

  CHECK_STRING (name, 0);
  temp_output_buffer_setup (XSTRING (name)->data);
  buf = Vstandard_output;

  val = Fprogn (Fcdr (args));

  temp_output_buffer_show (buf);

  return unbind_to (count, val);
}
#endif /* not standalone */

static void print ();

DEFUN ("terpri", Fterpri, Sterpri, 0, 1, 0,
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  "Output a newline to stream PRINTCHARFUN.\n\
If PRINTCHARFUN is omitted or nil, the value of `standard-output' is used.")
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  (printcharfun)
     Lisp_Object printcharfun;
{
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  PRINTDECLARE;
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  if (NILP (printcharfun))
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    printcharfun = Vstandard_output;
  PRINTPREPARE;
  PRINTCHAR ('\n');
  PRINTFINISH;
  return Qt;
}

DEFUN ("prin1", Fprin1, Sprin1, 1, 2, 0,
  "Output the printed representation of OBJECT, any Lisp object.\n\
Quoting characters are printed when needed to make output that `read'\n\
can handle, whenever this is possible.\n\
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Output stream is PRINTCHARFUN, or value of `standard-output' (which see).")
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  (object, printcharfun)
     Lisp_Object object, printcharfun;
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{
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  PRINTDECLARE;
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#ifdef MAX_PRINT_CHARS
  max_print = 0;
#endif /* MAX_PRINT_CHARS */
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  if (NILP (printcharfun))
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    printcharfun = Vstandard_output;
  PRINTPREPARE;
  print_depth = 0;
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  print (object, printcharfun, 1);
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  PRINTFINISH;
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  return object;
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}

/* a buffer which is used to hold output being built by prin1-to-string */
Lisp_Object Vprin1_to_string_buffer;

DEFUN ("prin1-to-string", Fprin1_to_string, Sprin1_to_string, 1, 2, 0,
  "Return a string containing the printed representation of OBJECT,\n\
any Lisp object.  Quoting characters are used when needed to make output\n\
that `read' can handle, whenever this is possible, unless the optional\n\
second argument NOESCAPE is non-nil.")
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  (object, noescape)
     Lisp_Object object, noescape;
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{
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  PRINTDECLARE;
  Lisp_Object printcharfun;
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  struct gcpro gcpro1, gcpro2;
  Lisp_Object tem;

  /* Save and restore this--we are altering a buffer
     but we don't want to deactivate the mark just for that.
     No need for specbind, since errors deactivate the mark.  */
  tem = Vdeactivate_mark;
  GCPRO2 (object, tem);
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  printcharfun = Vprin1_to_string_buffer;
  PRINTPREPARE;
  print_depth = 0;
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  print (object, printcharfun, NILP (noescape));
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  /* Make Vprin1_to_string_buffer be the default buffer after PRINTFINSH */
  PRINTFINISH;
  set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
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  object = Fbuffer_string ();
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  Ferase_buffer ();
  set_buffer_internal (old);
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  Vdeactivate_mark = tem;
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  UNGCPRO;

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  return object;
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}

DEFUN ("princ", Fprinc, Sprinc, 1, 2, 0,
  "Output the printed representation of OBJECT, any Lisp object.\n\
No quoting characters are used; no delimiters are printed around\n\
the contents of strings.\n\
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Output stream is PRINTCHARFUN, or value of standard-output (which see).")
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  (object, printcharfun)
     Lisp_Object object, printcharfun;
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{
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  PRINTDECLARE;
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  if (NILP (printcharfun))
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    printcharfun = Vstandard_output;
  PRINTPREPARE;
  print_depth = 0;
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  print (object, printcharfun, 0);
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  PRINTFINISH;
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  return object;
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}

DEFUN ("print", Fprint, Sprint, 1, 2, 0,
  "Output the printed representation of OBJECT, with newlines around it.\n\
Quoting characters are printed when needed to make output that `read'\n\
can handle, whenever this is possible.\n\
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Output stream is PRINTCHARFUN, or value of `standard-output' (which see).")
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  (object, printcharfun)
     Lisp_Object object, printcharfun;
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{
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  PRINTDECLARE;
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  struct gcpro gcpro1;

#ifdef MAX_PRINT_CHARS
  print_chars = 0;
  max_print = MAX_PRINT_CHARS;
#endif /* MAX_PRINT_CHARS */
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  if (NILP (printcharfun))
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    printcharfun = Vstandard_output;
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  GCPRO1 (object);
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  PRINTPREPARE;
  print_depth = 0;
  PRINTCHAR ('\n');
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  print (object, printcharfun, 1);
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  PRINTCHAR ('\n');
  PRINTFINISH;
#ifdef MAX_PRINT_CHARS
  max_print = 0;
  print_chars = 0;
#endif /* MAX_PRINT_CHARS */
  UNGCPRO;
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  return object;
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}

/* The subroutine object for external-debugging-output is kept here
   for the convenience of the debugger.  */
Lisp_Object Qexternal_debugging_output;

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DEFUN ("external-debugging-output", Fexternal_debugging_output, Sexternal_debugging_output, 1, 1, 0,
  "Write CHARACTER to stderr.\n\
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You can call print while debugging emacs, and pass it this function\n\
to make it write to the debugging output.\n")
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  (character)
     Lisp_Object character;
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{
  CHECK_NUMBER (character, 0);
  putc (XINT (character), stderr);
  
  return character;
}
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/* This is the interface for debugging printing.  */

void
debug_print (arg)
     Lisp_Object arg;
{
  Fprin1 (arg, Qexternal_debugging_output);
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  fprintf (stderr, "\r\n");
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}
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DEFUN ("error-message-string", Ferror_message_string, Serror_message_string,
       1, 1, 0,
  "Convert an error value (ERROR-SYMBOL . DATA) to an error message.")
  (obj)
     Lisp_Object obj;
{
  struct buffer *old = current_buffer;
  Lisp_Object original, printcharfun, value;
  struct gcpro gcpro1;

  print_error_message (obj, Vprin1_to_string_buffer, NULL);

  set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
  value = Fbuffer_string ();

  GCPRO1 (value);
  Ferase_buffer ();
  set_buffer_internal (old);
  UNGCPRO;

  return value;
}

/* Print an error message for the error DATA
   onto Lisp output stream STREAM (suitable for the print functions).  */

print_error_message (data, stream)
     Lisp_Object data, stream;
{
  Lisp_Object errname, errmsg, file_error, tail;
  struct gcpro gcpro1;
  int i;

  errname = Fcar (data);

  if (EQ (errname, Qerror))
    {
      data = Fcdr (data);
      if (!CONSP (data)) data = Qnil;
      errmsg = Fcar (data);
      file_error = Qnil;
    }
  else
    {
      errmsg = Fget (errname, Qerror_message);
      file_error = Fmemq (Qfile_error,
			  Fget (errname, Qerror_conditions));
    }

  /* Print an error message including the data items.  */

  tail = Fcdr_safe (data);
  GCPRO1 (tail);

  /* For file-error, make error message by concatenating
     all the data items.  They are all strings.  */
  if (!NILP (file_error) && !NILP (tail))
    errmsg = XCONS (tail)->car, tail = XCONS (tail)->cdr;

  if (STRINGP (errmsg))
    Fprinc (errmsg, stream);
  else
    write_string_1 ("peculiar error", -1, stream);

  for (i = 0; CONSP (tail); tail = Fcdr (tail), i++)
    {
      write_string_1 (i ? ", " : ": ", 2, stream);
      if (!NILP (file_error))
	Fprinc (Fcar (tail), stream);
      else
	Fprin1 (Fcar (tail), stream);
    }
  UNGCPRO;
}

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#ifdef LISP_FLOAT_TYPE

/*
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 * The buffer should be at least as large as the max string size of the
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 * largest float, printed in the biggest notation.  This is undoubtedly
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 * 20d float_output_format, with the negative of the C-constant "HUGE"
 * from <math.h>.
 * 
 * On the vax the worst case is -1e38 in 20d format which takes 61 bytes.
 * 
 * I assume that IEEE-754 format numbers can take 329 bytes for the worst
 * case of -1e307 in 20d float_output_format. What is one to do (short of
 * re-writing _doprnt to be more sane)?
 * 			-wsr
 */
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void
float_to_string (buf, data)
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     unsigned char *buf;
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     double data;
{
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  unsigned char *cp;
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  int width;
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  if (NILP (Vfloat_output_format)
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      || !STRINGP (Vfloat_output_format))
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  lose:
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    {
      sprintf (buf, "%.17g", data);
      width = -1;
    }
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  else			/* oink oink */
    {
      /* Check that the spec we have is fully valid.
	 This means not only valid for printf,
	 but meant for floats, and reasonable.  */
      cp = XSTRING (Vfloat_output_format)->data;

      if (cp[0] != '%')
	goto lose;
      if (cp[1] != '.')
	goto lose;

      cp += 2;
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      /* Check the width specification.  */
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      width = -1;
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      if ('0' <= *cp && *cp <= '9')
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	{
	  width = 0;
	  do
	    width = (width * 10) + (*cp++ - '0');
	  while (*cp >= '0' && *cp <= '9');

	  /* A precision of zero is valid only for %f.  */
	  if (width > DBL_DIG
	      || (width == 0 && *cp != 'f'))
	    goto lose;
	}
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      if (*cp != 'e' && *cp != 'f' && *cp != 'g')
	goto lose;

      if (cp[1] != 0)
	goto lose;

      sprintf (buf, XSTRING (Vfloat_output_format)->data, data);
    }
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  /* Make sure there is a decimal point with digit after, or an
     exponent, so that the value is readable as a float.  But don't do
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     this with "%.0f"; it's valid for that not to produce a decimal
     point.  Note that width can be 0 only for %.0f.  */
  if (width != 0)
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    {
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      for (cp = buf; *cp; cp++)
	if ((*cp < '0' || *cp > '9') && *cp != '-')
	  break;
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      if (*cp == '.' && cp[1] == 0)
	{
	  cp[1] = '0';
	  cp[2] = 0;
	}

      if (*cp == 0)
	{
	  *cp++ = '.';
	  *cp++ = '0';
	  *cp++ = 0;
	}
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    }
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}
#endif /* LISP_FLOAT_TYPE */

static void
print (obj, printcharfun, escapeflag)
     Lisp_Object obj;
     register Lisp_Object printcharfun;
     int escapeflag;
{
  char buf[30];

  QUIT;

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#if 1  /* I'm not sure this is really worth doing.  */
  /* Detect circularities and truncate them.
     No need to offer any alternative--this is better than an error.  */
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  if (CONSP (obj) || VECTORP (obj) || COMPILEDP (obj))
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    {
      int i;
      for (i = 0; i < print_depth; i++)
	if (EQ (obj, being_printed[i]))
	  {
	    sprintf (buf, "#%d", i);
	    strout (buf, -1, printcharfun);
	    return;
	  }
    }
#endif

  being_printed[print_depth] = obj;
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  print_depth++;

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  if (print_depth > PRINT_CIRCLE)
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    error ("Apparently circular structure being printed");
#ifdef MAX_PRINT_CHARS
  if (max_print && print_chars > max_print)
    {
      PRINTCHAR ('\n');
      print_chars = 0;
    }
#endif /* MAX_PRINT_CHARS */

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  switch (XGCTYPE (obj))
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    {
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    case Lisp_Int:
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      if (sizeof (int) == sizeof (EMACS_INT))
	sprintf (buf, "%d", XINT (obj));
      else if (sizeof (long) == sizeof (EMACS_INT))
	sprintf (buf, "%ld", XINT (obj));
      else
	abort ();
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      strout (buf, -1, printcharfun);
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      break;

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#ifdef LISP_FLOAT_TYPE
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    case Lisp_Float:
      {
	char pigbuf[350];	/* see comments in float_to_string */
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	float_to_string (pigbuf, XFLOAT(obj)->data);
	strout (pigbuf, -1, printcharfun);
      }
      break;
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#endif
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    case Lisp_String:
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      if (!escapeflag)
	print_string (obj, printcharfun);
      else
	{
	  register int i;
	  register unsigned char c;
	  struct gcpro gcpro1;

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	  GCPRO1 (obj);

#ifdef USE_TEXT_PROPERTIES
	  if (!NULL_INTERVAL_P (XSTRING (obj)->intervals))
	    {
	      PRINTCHAR ('#');
	      PRINTCHAR ('(');
	    }
#endif
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	  PRINTCHAR ('\"');
	  for (i = 0; i < XSTRING (obj)->size; i++)
	    {
	      QUIT;
	      c = XSTRING (obj)->data[i];
	      if (c == '\n' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('n');
		}
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	      else if (c == '\f' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('f');
		}
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	      else
		{
		  if (c == '\"' || c == '\\')
		    PRINTCHAR ('\\');
		  PRINTCHAR (c);
		}
	    }
	  PRINTCHAR ('\"');
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#ifdef USE_TEXT_PROPERTIES
	  if (!NULL_INTERVAL_P (XSTRING (obj)->intervals))
	    {
	      traverse_intervals (XSTRING (obj)->intervals,
				  0, 0, print_interval, printcharfun);
	      PRINTCHAR (')');
	    }
#endif

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	  UNGCPRO;
	}
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      break;
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    case Lisp_Symbol:
      {
	register int confusing;
	register unsigned char *p = XSYMBOL (obj)->name->data;
	register unsigned char *end = p + XSYMBOL (obj)->name->size;
	register unsigned char c;
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	int i;
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	if (p != end && (*p == '-' || *p == '+')) p++;
	if (p == end)
	  confusing = 0;
	else
	  {
	    while (p != end && *p >= '0' && *p <= '9')
	      p++;
	    confusing = (end == p);
	  }

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	/* If we print an uninterned symbol as part of a complex object and
	   the flag print-gensym is non-nil, prefix it with #n= to read the
	   object back with the #n# reader syntax later if needed.  */
	if (print_gensym && NILP (XSYMBOL (obj)->obarray))
	  {
	    if (print_depth > 1)
	      {
		Lisp_Object tem;
		tem = Fassq (obj, printed_gensyms);
		if (CONSP (tem))
		  {
		    PRINTCHAR ('#');
		    print (XCDR (tem), printcharfun, escapeflag);
		    PRINTCHAR ('#');
		    break;
		  }
		else
		  {
		    if (CONSP (printed_gensyms))
		      XSETFASTINT (tem, XCDR (XCAR (printed_gensyms)) + 1);
		    else
		      XSETFASTINT (tem, 1);
		    printed_gensyms = Fcons (Fcons (obj, tem), printed_gensyms);

		    PRINTCHAR ('#');
		    print (tem, printcharfun, escapeflag);
		    PRINTCHAR ('=');
		  }
	      }
	    PRINTCHAR ('#');
	    PRINTCHAR (':');
	  }

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	for (i = 0; i < XSYMBOL (obj)->name->size; i++)
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	  {
	    QUIT;
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	    c = XSYMBOL (obj)->name->data[i];

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	    if (escapeflag)
	      {
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		if (c == '\"' || c == '\\' || c == '\''
		    || c == ';' || c == '#' || c == '(' || c == ')'
		    || c == ',' || c =='.' || c == '`'
		    || c == '[' || c == ']' || c == '?' || c <= 040
		    || confusing)
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		  PRINTCHAR ('\\'), confusing = 0;
	      }
	    PRINTCHAR (c);
	  }
      }
      break;

    case Lisp_Cons:
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      /* If deeper than spec'd depth, print placeholder.  */
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      if (INTEGERP (Vprint_level)
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	  && print_depth > XINT (Vprint_level))
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	strout ("...", -1, printcharfun);
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      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
	       && (EQ (XCAR (obj), Qquote)))
	{
	  PRINTCHAR ('\'');
	  print (XCAR (XCDR (obj)), printcharfun, escapeflag);
	}
      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
	       && (EQ (XCAR (obj), Qfunction)))
	{
	  PRINTCHAR ('#');
	  PRINTCHAR ('\'');
	  print (XCAR (XCDR (obj)), printcharfun, escapeflag);
	}
      else if (print_quoted && CONSP (XCDR (obj)) && NILP (XCDR (XCDR (obj)))
	       && ((EQ (XCAR (obj), Qbackquote)
		    || EQ (XCAR (obj), Qcomma)
		    || EQ (XCAR (obj), Qcomma_at)
		    || EQ (XCAR (obj), Qcomma_dot))))
	{
	  print (XCAR (obj), printcharfun, 0);
	  print (XCAR (XCDR (obj)), printcharfun, escapeflag);
	}
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      else
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	{
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	  PRINTCHAR ('(');
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	  {
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	    register int i = 0;
	    register int max = 0;

	    if (INTEGERP (Vprint_length))
	      max = XINT (Vprint_length);
	    /* Could recognize circularities in cdrs here,
	       but that would make printing of long lists quadratic.
	       It's not worth doing.  */
	    while (CONSP (obj))
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	      {
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		if (i++)
		  PRINTCHAR (' ');
		if (max && i > max)
		  {
		    strout ("...", 3, printcharfun);
		    break;
		  }
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		print (XCAR (obj), printcharfun, escapeflag);
		obj = XCDR (obj);
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	      }
	  }
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	  if (!NILP (obj))
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	    {
	      strout (" . ", 3, printcharfun);
	      print (obj, printcharfun, escapeflag);
	    }
	  PRINTCHAR (')');
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	}
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      break;

    case Lisp_Vectorlike:
      if (PROCESSP (obj))
	{
	  if (escapeflag)
	    {
	      strout ("#<process ", -1, printcharfun);
	      print_string (XPROCESS (obj)->name, printcharfun);
	      PRINTCHAR ('>');
	    }
	  else
	    print_string (XPROCESS (obj)->name, printcharfun);
	}
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      else if (BOOL_VECTOR_P (obj))
	{
	  register int i;
	  register unsigned char c;
	  struct gcpro gcpro1;
	  int size_in_chars
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	    = (XBOOL_VECTOR (obj)->size + BITS_PER_CHAR - 1) / BITS_PER_CHAR;
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	  GCPRO1 (obj);

	  PRINTCHAR ('#');
	  PRINTCHAR ('&');
	  sprintf (buf, "%d", XBOOL_VECTOR (obj)->size);
	  strout (buf, -1, printcharfun);
	  PRINTCHAR ('\"');
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	  /* Don't print more characters than the specified maximum.  */
	  if (INTEGERP (Vprint_length)
	      && XINT (Vprint_length) < size_in_chars)
	    size_in_chars = XINT (Vprint_length);

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	  for (i = 0; i < size_in_chars; i++)
	    {
	      QUIT;
	      c = XBOOL_VECTOR (obj)->data[i];
	      if (c == '\n' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('n');
		}
	      else if (c == '\f' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('f');
		}
	      else
		{
		  if (c == '\"' || c == '\\')
		    PRINTCHAR ('\\');
		  PRINTCHAR (c);
		}
	    }
	  PRINTCHAR ('\"');

	  UNGCPRO;
	}
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      else if (SUBRP (obj))
	{
	  strout ("#<subr ", -1, printcharfun);
	  strout (XSUBR (obj)->symbol_name, -1, printcharfun);
	  PRINTCHAR ('>');
	}
#ifndef standalone
      else if (WINDOWP (obj))
	{
	  strout ("#<window ", -1, printcharfun);
	  sprintf (buf, "%d", XFASTINT (XWINDOW (obj)->sequence_number));
	  strout (buf, -1, printcharfun);
	  if (!NILP (XWINDOW (obj)->buffer))
	    {
	      strout (" on ", -1, printcharfun);
	      print_string (XBUFFER (XWINDOW (obj)->buffer)->name, printcharfun);
	    }
	  PRINTCHAR ('>');
	}
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      else if (BUFFERP (obj))
	{
	  if (NILP (XBUFFER (obj)->name))
	    strout ("#<killed buffer>", -1, printcharfun);
	  else if (escapeflag)
	    {
	      strout ("#<buffer ", -1, printcharfun);
	      print_string (XBUFFER (obj)->name, printcharfun);
	      PRINTCHAR ('>');
	    }
	  else
	    print_string (XBUFFER (obj)->name, printcharfun);
	}
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      else if (WINDOW_CONFIGURATIONP (obj))
	{
	  strout ("#<window-configuration>", -1, printcharfun);
	}
      else if (FRAMEP (obj))
	{
	  strout ((FRAME_LIVE_P (XFRAME (obj))
		   ? "#<frame " : "#<dead frame "),
		  -1, printcharfun);
	  print_string (XFRAME (obj)->name, printcharfun);
	  sprintf (buf, " 0x%lx", (unsigned long) (XFRAME (obj)));
	  strout (buf, -1, printcharfun);
	  PRINTCHAR ('>');
	}
#endif /* not standalone */
      else
	{
	  int size = XVECTOR (obj)->size;
	  if (COMPILEDP (obj))
	    {
	      PRINTCHAR ('#');
	      size &= PSEUDOVECTOR_SIZE_MASK;
	    }
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