print.c 27.5 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Lisp object printing and output streams.
2
   Copyright (C) 1985, 1986, 1988, 1993, 1994 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

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
Jim Blandy's avatar
Jim Blandy committed
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17 18 19 20
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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


21
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
22 23 24 25 26 27
#include <stdio.h>
#undef NULL
#include "lisp.h"

#ifndef standalone
#include "buffer.h"
Jim Blandy's avatar
Jim Blandy committed
28
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
29 30 31 32 33 34
#include "window.h"
#include "process.h"
#include "dispextern.h"
#include "termchar.h"
#endif /* not standalone */

Richard M. Stallman's avatar
Richard M. Stallman committed
35 36 37 38
#ifdef USE_TEXT_PROPERTIES
#include "intervals.h"
#endif

Jim Blandy's avatar
Jim Blandy committed
39 40 41 42 43 44 45 46 47
Lisp_Object Vstandard_output, Qstandard_output;

#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;

48 49 50 51
/* Detect most circularities to print finite output.  */
#define PRINT_CIRCLE 200
Lisp_Object being_printed[PRINT_CIRCLE];

Jim Blandy's avatar
Jim Blandy committed
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
/* 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;

/* Nonzero means print newline before next minibuffer message.
   Defined in xdisp.c */

extern int noninteractive_need_newline;
#ifdef MAX_PRINT_CHARS
static int print_chars;
static int max_print;
#endif /* MAX_PRINT_CHARS */
Richard M. Stallman's avatar
Richard M. Stallman committed
76 77

void print_interval ();
Jim Blandy's avatar
Jim Blandy committed
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130

#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

131
/* Low level output routines for characters and strings */
Jim Blandy's avatar
Jim Blandy committed
132 133 134 135 136 137 138 139 140 141 142 143

/* Lisp functions to do output using a stream
 must have the stream in a variable called printcharfun
 and must start with PRINTPREPARE and end with PRINTFINISH.
 Use PRINTCHAR to output one character,
 or call strout to output a block of characters.
 Also, each one must have the declarations
   struct buffer *old = current_buffer;
   int old_point = -1, start_point;
   Lisp_Object original;
*/ 

144 145 146
#define PRINTPREPARE						\
   original = printcharfun;					\
   if (NILP (printcharfun)) printcharfun = Qt;			\
147
   if (BUFFERP (printcharfun))					\
148 149 150
     { if (XBUFFER (printcharfun) != current_buffer)		\
	 Fset_buffer (printcharfun);				\
       printcharfun = Qnil;}					\
151
   if (MARKERP (printcharfun))					\
152 153 154 155 156 157 158
     { if (!(XMARKER (original)->buffer))			\
         error ("Marker does not point anywhere");		\
       if (XMARKER (original)->buffer != current_buffer)	\
         set_buffer_internal (XMARKER (original)->buffer);	\
       old_point = point;					\
       SET_PT (marker_position (printcharfun));			\
       start_point = point;					\
Jim Blandy's avatar
Jim Blandy committed
159 160
       printcharfun = Qnil;}

161
#define PRINTFINISH					\
162
   if (MARKERP (original))				\
163 164 165 166 167
     Fset_marker (original, make_number (point), Qnil);	\
   if (old_point >= 0)					\
     SET_PT (old_point + (old_point >= start_point	\
			  ? point - start_point : 0));	\
   if (old != current_buffer)				\
Jim Blandy's avatar
Jim Blandy committed
168 169 170 171
     set_buffer_internal (old)

#define PRINTCHAR(ch) printchar (ch, printcharfun)

172
/* Index of first unused element of FRAME_MESSAGE_BUF(mini_frame). */
Jim Blandy's avatar
Jim Blandy committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
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;
      insert (&ch, 1);
      return;
    }

  if (EQ (fun, Qt))
    {
196
      FRAME_PTR mini_frame
197 198
	= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));

Jim Blandy's avatar
Jim Blandy committed
199 200 201 202 203 204 205
      if (noninteractive)
	{
	  putchar (ch);
	  noninteractive_need_newline = 1;
	  return;
	}

206
      if (echo_area_glyphs != FRAME_MESSAGE_BUF (mini_frame)
Jim Blandy's avatar
Jim Blandy committed
207 208
	  || !message_buf_print)
	{
209
	  echo_area_glyphs = FRAME_MESSAGE_BUF (mini_frame);
Jim Blandy's avatar
Jim Blandy committed
210
	  printbufidx = 0;
211
	  echo_area_glyphs_length = 0;
Jim Blandy's avatar
Jim Blandy committed
212 213 214
	  message_buf_print = 1;
	}

215 216 217
      if (printbufidx < FRAME_WIDTH (mini_frame) - 1)
	FRAME_MESSAGE_BUF (mini_frame)[printbufidx++] = ch;
      FRAME_MESSAGE_BUF (mini_frame)[printbufidx] = 0;
218
      echo_area_glyphs_length = printbufidx;
Jim Blandy's avatar
Jim Blandy committed
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246

      return;
    }
#endif /* not standalone */

  XFASTINT (ch1) = ch;
  call1 (fun, ch1);
}

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

  if (EQ (printcharfun, Qnil))
    {
      insert (ptr, size >= 0 ? size : strlen (ptr));
#ifdef MAX_PRINT_CHARS
      if (max_print)
        print_chars += size >= 0 ? size : strlen(ptr);
#endif /* MAX_PRINT_CHARS */
      return;
    }
  if (EQ (printcharfun, Qt))
    {
247
      FRAME_PTR mini_frame
248 249
	= XFRAME (WINDOW_FRAME (XWINDOW (minibuf_window)));

Jim Blandy's avatar
Jim Blandy committed
250 251 252 253 254 255 256 257 258 259 260 261 262
      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;
	}

263
      if (echo_area_glyphs != FRAME_MESSAGE_BUF (mini_frame)
Jim Blandy's avatar
Jim Blandy committed
264 265
	  || !message_buf_print)
	{
266
	  echo_area_glyphs = FRAME_MESSAGE_BUF (mini_frame);
Jim Blandy's avatar
Jim Blandy committed
267
	  printbufidx = 0;
268
	  echo_area_glyphs_length = 0;
Jim Blandy's avatar
Jim Blandy committed
269 270 271
	  message_buf_print = 1;
	}

272 273 274
      if (i > FRAME_WIDTH (mini_frame) - printbufidx - 1)
	i = FRAME_WIDTH (mini_frame) - printbufidx - 1;
      bcopy (ptr, &FRAME_MESSAGE_BUF (mini_frame) [printbufidx], i);
Jim Blandy's avatar
Jim Blandy committed
275
      printbufidx += i;
276
      echo_area_glyphs_length = printbufidx;
277
      FRAME_MESSAGE_BUF (mini_frame) [printbufidx] = 0;
Jim Blandy's avatar
Jim Blandy committed
278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297

      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.
   It isn't safe to use strout, because printing one char can relocate.  */

print_string (string, printcharfun)
     Lisp_Object string;
     Lisp_Object printcharfun;
{
  if (EQ (printcharfun, Qnil) || EQ (printcharfun, Qt))
Jim Blandy's avatar
Jim Blandy committed
298
    /* In predictable cases, strout is safe: output to buffer or frame.  */
Jim Blandy's avatar
Jim Blandy committed
299 300 301 302 303 304 305 306 307 308 309 310 311 312 313
    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,
Karl Heuer's avatar
Karl Heuer committed
314 315
  "Output character CHAR to stream PRINTCHARFUN.\n\
PRINTCHARFUN defaults to the value of `standard-output' (which see).")
Jim Blandy's avatar
Jim Blandy committed
316 317 318 319 320 321 322 323
  (ch, printcharfun)
     Lisp_Object ch, printcharfun;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

Jim Blandy's avatar
Jim Blandy committed
324
  if (NILP (printcharfun))
Jim Blandy's avatar
Jim Blandy committed
325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401
    printcharfun = Vstandard_output;
  CHECK_NUMBER (ch, 0);
  PRINTPREPARE;
  PRINTCHAR (XINT (ch));
  PRINTFINISH;
  return ch;
}

/* 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;
{
  struct buffer *old = current_buffer;
  Lisp_Object printcharfun;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

  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;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

  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)));

  current_buffer->read_only = Qnil;
  Ferase_buffer ();

  XSET (buf, Lisp_Buffer, current_buffer);
  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;
402
  struct gcpro gcpro1;
Jim Blandy's avatar
Jim Blandy committed
403

404
  GCPRO1 (args);
Jim Blandy's avatar
Jim Blandy committed
405 406 407
  record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
  temp_output_buffer_setup (bufname);
  buf = Vstandard_output;
408
  UNGCPRO;
Jim Blandy's avatar
Jim Blandy committed
409 410 411

  val = (*function) (args);

412
  GCPRO1 (val);
Jim Blandy's avatar
Jim Blandy committed
413
  temp_output_buffer_show (buf);
414
  UNGCPRO;
Jim Blandy's avatar
Jim Blandy committed
415 416 417 418 419 420 421 422 423 424 425 426

  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\
427
If variable `temp-buffer-show-function' is non-nil, call it at the end\n\
Jim Blandy's avatar
Jim Blandy committed
428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
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,
Karl Heuer's avatar
Karl Heuer committed
456 457
  "Output a newline to stream PRINTCHARFUN.\n\
If PRINTCHARFUN is omitted or nil, the value of `standard-output' is used.")
Jim Blandy's avatar
Jim Blandy committed
458 459 460 461 462 463 464 465
  (printcharfun)
     Lisp_Object printcharfun;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

Jim Blandy's avatar
Jim Blandy committed
466
  if (NILP (printcharfun))
Jim Blandy's avatar
Jim Blandy committed
467 468 469 470 471 472 473 474 475 476 477
    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\
Karl Heuer's avatar
Karl Heuer committed
478
Output stream is PRINTCHARFUN, or value of `standard-output' (which see).")
Jim Blandy's avatar
Jim Blandy committed
479 480 481 482 483 484 485 486 487 488 489
  (obj, printcharfun)
     Lisp_Object obj, printcharfun;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

#ifdef MAX_PRINT_CHARS
  max_print = 0;
#endif /* MAX_PRINT_CHARS */
Jim Blandy's avatar
Jim Blandy committed
490
  if (NILP (printcharfun))
Jim Blandy's avatar
Jim Blandy committed
491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518
    printcharfun = Vstandard_output;
  PRINTPREPARE;
  print_depth = 0;
  print (obj, printcharfun, 1);
  PRINTFINISH;
  return obj;
}

/* 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.")
  (obj, noescape)
     Lisp_Object obj, noescape;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original, printcharfun;
  struct gcpro gcpro1;

  printcharfun = Vprin1_to_string_buffer;
  PRINTPREPARE;
  print_depth = 0;
Jim Blandy's avatar
Jim Blandy committed
519
  print (obj, printcharfun, NILP (noescape));
Jim Blandy's avatar
Jim Blandy committed
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
  /* Make Vprin1_to_string_buffer be the default buffer after PRINTFINSH */
  PRINTFINISH;
  set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
  obj = Fbuffer_string ();

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

  return obj;
}

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\
Karl Heuer's avatar
Karl Heuer committed
537
Output stream is PRINTCHARFUN, or value of standard-output (which see).")
Jim Blandy's avatar
Jim Blandy committed
538 539 540 541 542 543 544 545
  (obj, printcharfun)
     Lisp_Object obj, printcharfun;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;

Jim Blandy's avatar
Jim Blandy committed
546
  if (NILP (printcharfun))
Jim Blandy's avatar
Jim Blandy committed
547 548 549 550 551 552 553 554 555 556 557 558
    printcharfun = Vstandard_output;
  PRINTPREPARE;
  print_depth = 0;
  print (obj, printcharfun, 0);
  PRINTFINISH;
  return obj;
}

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\
Karl Heuer's avatar
Karl Heuer committed
559
Output stream is PRINTCHARFUN, or value of `standard-output' (which see).")
Jim Blandy's avatar
Jim Blandy committed
560 561 562 563 564 565 566 567 568 569 570 571 572
  (obj, printcharfun)
     Lisp_Object obj, printcharfun;
{
  struct buffer *old = current_buffer;
  int old_point = -1;
  int start_point;
  Lisp_Object original;
  struct gcpro gcpro1;

#ifdef MAX_PRINT_CHARS
  print_chars = 0;
  max_print = MAX_PRINT_CHARS;
#endif /* MAX_PRINT_CHARS */
Jim Blandy's avatar
Jim Blandy committed
573
  if (NILP (printcharfun))
Jim Blandy's avatar
Jim Blandy committed
574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593
    printcharfun = Vstandard_output;
  GCPRO1 (obj);
  PRINTPREPARE;
  print_depth = 0;
  PRINTCHAR ('\n');
  print (obj, printcharfun, 1);
  PRINTCHAR ('\n');
  PRINTFINISH;
#ifdef MAX_PRINT_CHARS
  max_print = 0;
  print_chars = 0;
#endif /* MAX_PRINT_CHARS */
  UNGCPRO;
  return obj;
}

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

Jim Blandy's avatar
Jim Blandy committed
594 595
DEFUN ("external-debugging-output", Fexternal_debugging_output, Sexternal_debugging_output, 1, 1, 0,
  "Write CHARACTER to stderr.\n\
Jim Blandy's avatar
Jim Blandy committed
596 597
You can call print while debugging emacs, and pass it this function\n\
to make it write to the debugging output.\n")
Jim Blandy's avatar
Jim Blandy committed
598 599
  (character)
     Lisp_Object character;
Jim Blandy's avatar
Jim Blandy committed
600 601 602 603 604 605
{
  CHECK_NUMBER (character, 0);
  putc (XINT (character), stderr);
  
  return character;
}
606 607 608 609 610 611 612 613 614

/* This is the interface for debugging printing.  */

void
debug_print (arg)
     Lisp_Object arg;
{
  Fprin1 (arg, Qexternal_debugging_output);
}
Jim Blandy's avatar
Jim Blandy committed
615 616 617 618

#ifdef LISP_FLOAT_TYPE

/*
619
 * The buffer should be at least as large as the max string size of the
Jim Blandy's avatar
Jim Blandy committed
620 621 622 623 624 625 626 627 628 629 630
 * largest float, printed in the biggest notation.  This is undoubtably
 * 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
 */
631 632 633

void
float_to_string (buf, data)
634
     unsigned char *buf;
Jim Blandy's avatar
Jim Blandy committed
635 636
     double data;
{
637
  unsigned char *cp;
638
  int width;
Jim Blandy's avatar
Jim Blandy committed
639
      
Jim Blandy's avatar
Jim Blandy committed
640
  if (NILP (Vfloat_output_format)
641
      || !STRINGP (Vfloat_output_format))
Jim Blandy's avatar
Jim Blandy committed
642
  lose:
643 644 645 646
    {
      sprintf (buf, "%.17g", data);
      width = -1;
    }
Jim Blandy's avatar
Jim Blandy committed
647 648 649 650 651 652 653 654 655 656 657 658 659
  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;
660 661

      /* Check the width specification.  */
662
      width = -1;
663 664 665
      if ('0' <= *cp && *cp <= '9')
	for (width = 0; (*cp >= '0' && *cp <= '9'); cp++)
	  width = (width * 10) + (*cp - '0');
Jim Blandy's avatar
Jim Blandy committed
666 667 668 669

      if (*cp != 'e' && *cp != 'f' && *cp != 'g')
	goto lose;

670 671 672 673 674
      /* A precision of zero is valid for %f; everything else requires
	 at least one.  Width may be omitted anywhere.  */
      if (width != -1
	  && (width < (*cp != 'f')
	      || width > DBL_DIG))
Jim Blandy's avatar
Jim Blandy committed
675 676 677 678 679 680 681
	goto lose;

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

      sprintf (buf, XSTRING (Vfloat_output_format)->data, data);
    }
682

683 684
  /* 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
685 686 687
     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)
688
    {
689 690 691
      for (cp = buf; *cp; cp++)
	if ((*cp < '0' || *cp > '9') && *cp != '-')
	  break;
692

693 694 695 696 697 698 699 700 701 702 703 704
      if (*cp == '.' && cp[1] == 0)
	{
	  cp[1] = '0';
	  cp[2] = 0;
	}

      if (*cp == 0)
	{
	  *cp++ = '.';
	  *cp++ = '0';
	  *cp++ = 0;
	}
705
    }
Jim Blandy's avatar
Jim Blandy committed
706 707 708 709 710 711 712 713 714 715 716 717 718
}
#endif /* LISP_FLOAT_TYPE */

static void
print (obj, printcharfun, escapeflag)
     Lisp_Object obj;
     register Lisp_Object printcharfun;
     int escapeflag;
{
  char buf[30];

  QUIT;

719 720 721
#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.  */
722
  if (CONSP (obj) || VECTORP (obj) || COMPILEDP (obj))
723 724 725 726 727 728 729 730 731 732 733 734 735
    {
      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;
Jim Blandy's avatar
Jim Blandy committed
736 737
  print_depth++;

738
  if (print_depth > PRINT_CIRCLE)
Jim Blandy's avatar
Jim Blandy committed
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
    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 */

#ifdef SWITCH_ENUM_BUG
  switch ((int) XTYPE (obj))
#else
  switch (XTYPE (obj))
#endif
    {
    default:
      /* We're in trouble if this happens!
	 Probably should just abort () */
      strout ("#<EMACS BUG: INVALID DATATYPE ", -1, printcharfun);
      sprintf (buf, "(#o%3o)", (int) XTYPE (obj));
      strout (buf, -1, printcharfun);
      strout (" Save your buffers immediately and please report this bug>",
	      -1, printcharfun);
      break;

#ifdef LISP_FLOAT_TYPE
    case Lisp_Float:
      {
	char pigbuf[350];	/* see comments in float_to_string */

	float_to_string (pigbuf, XFLOAT(obj)->data);
	strout (pigbuf, -1, printcharfun);
      }
      break;
#endif /* LISP_FLOAT_TYPE */

    case Lisp_Int:
      sprintf (buf, "%d", XINT (obj));
      strout (buf, -1, printcharfun);
      break;

    case Lisp_String:
      if (!escapeflag)
	print_string (obj, printcharfun);
      else
	{
	  register int i;
	  register unsigned char c;
	  struct gcpro gcpro1;

Richard M. Stallman's avatar
Richard M. Stallman committed
789 790 791 792 793 794 795 796 797
	  GCPRO1 (obj);

#ifdef USE_TEXT_PROPERTIES
	  if (!NULL_INTERVAL_P (XSTRING (obj)->intervals))
	    {
	      PRINTCHAR ('#');
	      PRINTCHAR ('(');
	    }
#endif
Jim Blandy's avatar
Jim Blandy committed
798 799 800 801 802 803 804 805 806 807 808

	  PRINTCHAR ('\"');
	  for (i = 0; i < XSTRING (obj)->size; i++)
	    {
	      QUIT;
	      c = XSTRING (obj)->data[i];
	      if (c == '\n' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('n');
		}
809 810 811 812 813
	      else if (c == '\f' && print_escape_newlines)
		{
		  PRINTCHAR ('\\');
		  PRINTCHAR ('f');
		}
Jim Blandy's avatar
Jim Blandy committed
814 815 816 817 818 819 820 821
	      else
		{
		  if (c == '\"' || c == '\\')
		    PRINTCHAR ('\\');
		  PRINTCHAR (c);
		}
	    }
	  PRINTCHAR ('\"');
Richard M. Stallman's avatar
Richard M. Stallman committed
822 823 824 825 826 827 828 829 830 831

#ifdef USE_TEXT_PROPERTIES
	  if (!NULL_INTERVAL_P (XSTRING (obj)->intervals))
	    {
	      traverse_intervals (XSTRING (obj)->intervals,
				  0, 0, print_interval, printcharfun);
	      PRINTCHAR (')');
	    }
#endif

Jim Blandy's avatar
Jim Blandy committed
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
	  UNGCPRO;
	}
      break;

    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;

	if (p != end && (*p == '-' || *p == '+')) p++;
        if (p == end)
	  confusing = 0;
	else
	  {
	    while (p != end && *p >= '0' && *p <= '9')
	      p++;
	    confusing = (end == p);
	  }

	p = XSYMBOL (obj)->name->data;
	while (p != end)
	  {
	    QUIT;
	    c = *p++;
	    if (escapeflag)
	      {
		if (c == '\"' || c == '\\' || c == '\'' || c == ';' || c == '#' ||
		    c == '(' || c == ')' || c == ',' || c =='.' || c == '`' ||
		    c == '[' || c == ']' || c == '?' || c <= 040 || confusing)
		  PRINTCHAR ('\\'), confusing = 0;
	      }
	    PRINTCHAR (c);
	  }
      }
      break;

    case Lisp_Cons:
      /* If deeper than spec'd depth, print placeholder.  */
872
      if (INTEGERP (Vprint_level)
Jim Blandy's avatar
Jim Blandy committed
873 874 875 876 877 878 879 880 881 882 883
	  && print_depth > XINT (Vprint_level))
	{
	  strout ("...", -1, printcharfun);
	  break;
	}

      PRINTCHAR ('(');
      {
	register int i = 0;
	register int max = 0;

884
	if (INTEGERP (Vprint_length))
Jim Blandy's avatar
Jim Blandy committed
885
	  max = XINT (Vprint_length);
886 887 888
	/* Could recognize circularities in cdrs here,
	   but that would make printing of long lists quadratic.
	   It's not worth doing.  */
Jim Blandy's avatar
Jim Blandy committed
889 890 891 892 893 894 895 896 897 898 899 900 901
	while (CONSP (obj))
	  {
	    if (i++)
	      PRINTCHAR (' ');
	    if (max && i > max)
	      {
		strout ("...", 3, printcharfun);
		break;
	      }
	    print (Fcar (obj), printcharfun, escapeflag);
	    obj = Fcdr (obj);
	  }
      }
Jim Blandy's avatar
Jim Blandy committed
902
      if (!NILP (obj) && !CONSP (obj))
Jim Blandy's avatar
Jim Blandy committed
903 904 905 906 907 908 909 910
	{
	  strout (" . ", 3, printcharfun);
	  print (obj, printcharfun, escapeflag);
	}
      PRINTCHAR (')');
      break;

    case Lisp_Compiled:
911
      strout ("#", -1, printcharfun);
Jim Blandy's avatar
Jim Blandy committed
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
    case Lisp_Vector:
      PRINTCHAR ('[');
      {
	register int i;
	register Lisp_Object tem;
	for (i = 0; i < XVECTOR (obj)->size; i++)
	  {
	    if (i) PRINTCHAR (' ');
	    tem = XVECTOR (obj)->contents[i];
	    print (tem, printcharfun, escapeflag);
	  }
      }
      PRINTCHAR (']');
      break;

#ifndef standalone
    case Lisp_Buffer:
Jim Blandy's avatar
Jim Blandy committed
929
      if (NILP (XBUFFER (obj)->name))
Jim Blandy's avatar
Jim Blandy committed
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
	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);
      break;

    case Lisp_Process:
      if (escapeflag)
	{
	  strout ("#<process ", -1, printcharfun);
	  print_string (XPROCESS (obj)->name, printcharfun);
	  PRINTCHAR ('>');
	}
      else
	print_string (XPROCESS (obj)->name, printcharfun);
      break;

    case Lisp_Window:
      strout ("#<window ", -1, printcharfun);
      sprintf (buf, "%d", XFASTINT (XWINDOW (obj)->sequence_number));
      strout (buf, -1, printcharfun);
Jim Blandy's avatar
Jim Blandy committed
956
      if (!NILP (XWINDOW (obj)->buffer))
Jim Blandy's avatar
Jim Blandy committed
957 958 959 960 961 962 963 964 965 966 967
	{
	  strout (" on ", -1, printcharfun);
	  print_string (XBUFFER (XWINDOW (obj)->buffer)->name, printcharfun);
	}
      PRINTCHAR ('>');
      break;

    case Lisp_Window_Configuration:
      strout ("#<window-configuration>", -1, printcharfun);
      break;

Jim Blandy's avatar
Jim Blandy committed
968 969 970 971
#ifdef MULTI_FRAME
    case Lisp_Frame:
      strout ((FRAME_LIVE_P (XFRAME (obj))
	       ? "#<frame " : "#<dead frame "),
Jim Blandy's avatar
Jim Blandy committed
972
	      -1, printcharfun);
Jim Blandy's avatar
Jim Blandy committed
973
      print_string (XFRAME (obj)->name, printcharfun);
974 975 976 977
      if (sizeof (EMACS_INT) > 4)
	sprintf (buf, " 0x%lx", (EMACS_UINT) (XFRAME (obj)));
      else
	sprintf (buf, " 0x%x", (EMACS_UINT) (XFRAME (obj)));
Jim Blandy's avatar
Jim Blandy committed
978 979 980
      strout (buf, -1, printcharfun);
      strout (">", -1, printcharfun);
      break;
Jim Blandy's avatar
Jim Blandy committed
981
#endif /* MULTI_FRAME */
Jim Blandy's avatar
Jim Blandy committed
982 983 984 985 986 987 988 989 990 991 992 993 994 995

    case Lisp_Marker:
      strout ("#<marker ", -1, printcharfun);
      if (!(XMARKER (obj)->buffer))
	strout ("in no buffer", -1, printcharfun);
      else
	{
	  sprintf (buf, "at %d", marker_position (obj));
	  strout (buf, -1, printcharfun);
	  strout (" in ", -1, printcharfun);
	  print_string (XMARKER (obj)->buffer->name, printcharfun);
	}
      PRINTCHAR ('>');
      break;
Jim Blandy's avatar
Jim Blandy committed
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012

    case Lisp_Overlay:
      strout ("#<overlay ", -1, printcharfun);
      if (!(XMARKER (OVERLAY_START (obj))->buffer))
	strout ("in no buffer", -1, printcharfun);
      else
	{
	  sprintf (buf, "from %d to %d in ",
		   marker_position (OVERLAY_START (obj)),
		   marker_position (OVERLAY_END   (obj)));
	  strout (buf, -1, printcharfun);
	  print_string (XMARKER (OVERLAY_START (obj))->buffer->name,
			printcharfun);
	}
      PRINTCHAR ('>');
      break;

Jim Blandy's avatar
Jim Blandy committed
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
#endif /* standalone */

    case Lisp_Subr:
      strout ("#<subr ", -1, printcharfun);
      strout (XSUBR (obj)->symbol_name, -1, printcharfun);
      PRINTCHAR ('>');
      break;
    }

  print_depth--;
}

Richard M. Stallman's avatar
Richard M. Stallman committed
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
#ifdef USE_TEXT_PROPERTIES

/* Print a description of INTERVAL using PRINTCHARFUN.
   This is part of printing a string that has text properties.  */

void
print_interval (interval, printcharfun)
     INTERVAL interval;
     Lisp_Object printcharfun;
{
1035
  PRINTCHAR (' ');
Richard M. Stallman's avatar
Richard M. Stallman committed
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
  print (make_number (interval->position), printcharfun, 1);
  PRINTCHAR (' ');
  print (make_number (interval->position + LENGTH (interval)),
	 printcharfun, 1);
  PRINTCHAR (' ');
  print (interval->plist, printcharfun, 1);
}

#endif /* USE_TEXT_PROPERTIES */

Jim Blandy's avatar
Jim Blandy committed
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
void
syms_of_print ()
{
  staticpro (&Qprint_escape_newlines);
  Qprint_escape_newlines = intern ("print-escape-newlines");

  DEFVAR_LISP ("standard-output", &Vstandard_output,
    "Output stream `print' uses by default for outputting a character.\n\
This may be any function of one argument.\n\
It may also be a buffer (output is inserted before point)\n\
or a marker (output is inserted and the marker is advanced)\n\
or the symbol t (output appears in the minibuffer line).");
  Vstandard_output = Qt;
  Qstandard_output = intern ("standard-output");
  staticpro (&Qstandard_output);

#ifdef LISP_FLOAT_TYPE
  DEFVAR_LISP ("float-output-format", &Vfloat_output_format,
1064
    "The format descriptor string used to print floats.\n\
Jim Blandy's avatar
Jim Blandy committed
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
This is a %-spec like those accepted by `printf' in C,\n\
but with some restrictions.  It must start with the two characters `%.'.\n\
After that comes an integer precision specification,\n\
and then a letter which controls the format.\n\
The letters allowed are `e', `f' and `g'.\n\
Use `e' for exponential notation \"DIG.DIGITSeEXPT\"\n\
Use `f' for decimal point notation \"DIGITS.DIGITS\".\n\
Use `g' to choose the shorter of those two formats for the number at hand.\n\
The precision in any of these cases is the number of digits following\n\
the decimal point.  With `f', a precision of 0 means to omit the\n\
1075
decimal point.  0 is not allowed with `e' or `g'.\n\n\
1076
A value of nil means to use `%.17g'.");
Jim Blandy's avatar
Jim Blandy committed
1077 1078 1079 1080 1081 1082
  Vfloat_output_format = Qnil;
  Qfloat_output_format = intern ("float-output-format");
  staticpro (&Qfloat_output_format);
#endif /* LISP_FLOAT_TYPE */

  DEFVAR_LISP ("print-length", &Vprint_length,
1083
    "Maximum length of list to print before abbreviating.\n\
Jim Blandy's avatar
Jim Blandy committed
1084 1085 1086 1087
A value of nil means no limit.");
  Vprint_length = Qnil;

  DEFVAR_LISP ("print-level", &Vprint_level,
1088
    "Maximum depth of list nesting to print before abbreviating.\n\
Jim Blandy's avatar
Jim Blandy committed
1089 1090 1091 1092
A value of nil means no limit.");
  Vprint_level = Qnil;

  DEFVAR_BOOL ("print-escape-newlines", &print_escape_newlines,
1093
    "Non-nil means print newlines in strings as backslash-n.\n\
1094
Also print formfeeds as backslash-f.");
Jim Blandy's avatar
Jim Blandy committed
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
  print_escape_newlines = 0;

  /* prin1_to_string_buffer initialized in init_buffer_once in buffer.c */
  staticpro (&Vprin1_to_string_buffer);

  defsubr (&Sprin1);
  defsubr (&Sprin1_to_string);
  defsubr (&Sprinc);
  defsubr (&Sprint);
  defsubr (&Sterpri);
  defsubr (&Swrite_char);
  defsubr (&Sexternal_debugging_output);

  Qexternal_debugging_output = intern ("external-debugging-output");
  staticpro (&Qexternal_debugging_output);

#ifndef standalone
  defsubr (&Swith_output_to_temp_buffer);
#endif /* not standalone */
}