editfns.c 113 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Lisp functions pertaining to editing.
2
   Copyright (C) 1985,86,87,89,93,94,95,96,97,98, 1999 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
Karl Heuer's avatar
Karl Heuer 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
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
Richard M. Stallman's avatar
Richard M. Stallman committed
18 19
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
20 21


22
#include <config.h>
23
#include <sys/types.h>
Jim Blandy's avatar
Jim Blandy committed
24 25

#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
26
#include "vms-pwd.h"
Jim Blandy's avatar
Jim Blandy committed
27
#else
Jim Blandy's avatar
Jim Blandy committed
28
#include <pwd.h>
Jim Blandy's avatar
Jim Blandy committed
29 30
#endif

Andreas Schwab's avatar
Andreas Schwab committed
31 32 33 34
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
35
#include "lisp.h"
36
#include "intervals.h"
Jim Blandy's avatar
Jim Blandy committed
37
#include "buffer.h"
Karl Heuer's avatar
Karl Heuer committed
38
#include "charset.h"
39
#include "coding.h"
Jim Blandy's avatar
Jim Blandy committed
40 41
#include "window.h"

Jim Blandy's avatar
Jim Blandy committed
42
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
43 44 45 46

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

47 48 49 50
#ifndef NULL
#define NULL 0
#endif

51
extern char **environ;
52
extern int use_dialog_box;
53
extern Lisp_Object make_time ();
54
extern void insert_from_buffer ();
55
static int tm_diff ();
56
static void update_buffer_properties ();
57
size_t emacs_strftimeu ();
58
void set_time_zone_rule ();
59 60 61 62

Lisp_Object Vbuffer_access_fontify_functions;
Lisp_Object Qbuffer_access_fontify_functions;
Lisp_Object Vbuffer_access_fontified_property;
63

64 65
Lisp_Object Fuser_full_name ();

Jim Blandy's avatar
Jim Blandy committed
66 67 68
/* Some static data, and a function to initialize it for each run */

Lisp_Object Vsystem_name;
69 70 71
Lisp_Object Vuser_real_login_name;	/* login name of current user ID */
Lisp_Object Vuser_full_name;		/* full name of current user */
Lisp_Object Vuser_login_name;		/* user name from LOGNAME or USER */
Jim Blandy's avatar
Jim Blandy committed
72 73 74 75

void
init_editfns ()
{
Jim Blandy's avatar
Jim Blandy committed
76
  char *user_name;
77
  register unsigned char *p;
Jim Blandy's avatar
Jim Blandy committed
78 79 80 81
  struct passwd *pw;	/* password entry for the current user */
  Lisp_Object tem;

  /* Set up system_name even when dumping.  */
82
  init_system_name ();
Jim Blandy's avatar
Jim Blandy committed
83 84 85 86 87 88 89 90

#ifndef CANNOT_DUMP
  /* Don't bother with this on initial start when just dumping out */
  if (!initialized)
    return;
#endif /* not CANNOT_DUMP */

  pw = (struct passwd *) getpwuid (getuid ());
Morten Welinder's avatar
Morten Welinder committed
91 92 93 94
#ifdef MSDOS
  /* We let the real user name default to "root" because that's quite
     accurate on MSDOG and because it lets Emacs find the init file.
     (The DVX libraries override the Djgpp libraries here.)  */
95
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "root");
Morten Welinder's avatar
Morten Welinder committed
96
#else
97
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "unknown");
Morten Welinder's avatar
Morten Welinder committed
98
#endif
Jim Blandy's avatar
Jim Blandy committed
99

Jim Blandy's avatar
Jim Blandy committed
100 101
  /* Get the effective user name, by consulting environment variables,
     or the effective uid if those are unset.  */
102
  user_name = (char *) getenv ("LOGNAME");
Jim Blandy's avatar
Jim Blandy committed
103
  if (!user_name)
104 105 106
#ifdef WINDOWSNT
    user_name = (char *) getenv ("USERNAME");	/* it's USERNAME on NT */
#else  /* WINDOWSNT */
107
    user_name = (char *) getenv ("USER");
108
#endif /* WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
109 110 111 112 113
  if (!user_name)
    {
      pw = (struct passwd *) getpwuid (geteuid ());
      user_name = (char *) (pw ? pw->pw_name : "unknown");
    }
114
  Vuser_login_name = build_string (user_name);
Jim Blandy's avatar
Jim Blandy committed
115

Jim Blandy's avatar
Jim Blandy committed
116 117
  /* If the user name claimed in the environment vars differs from
     the real uid, use the claimed name to find the full name.  */
118
  tem = Fstring_equal (Vuser_login_name, Vuser_real_login_name);
119 120
  Vuser_full_name = Fuser_full_name (NILP (tem)? make_number (geteuid())
				     : Vuser_login_name);
Jim Blandy's avatar
Jim Blandy committed
121
  
122
  p = (unsigned char *) getenv ("NAME");
123 124
  if (p)
    Vuser_full_name = build_string (p);
125 126
  else if (NILP (Vuser_full_name))
    Vuser_full_name = build_string ("unknown");
Jim Blandy's avatar
Jim Blandy committed
127 128 129
}

DEFUN ("char-to-string", Fchar_to_string, Schar_to_string, 1, 1, 0,
130
  "Convert arg CHAR to a string containing that character.")
131 132
  (character)
     Lisp_Object character;
Jim Blandy's avatar
Jim Blandy committed
133
{
Karl Heuer's avatar
Karl Heuer committed
134
  int len;
135
  unsigned char str[MAX_MULTIBYTE_LENGTH];
Karl Heuer's avatar
Karl Heuer committed
136

137
  CHECK_NUMBER (character, 0);
Jim Blandy's avatar
Jim Blandy committed
138

139
  len = CHAR_STRING (XFASTINT (character), str);
140
  return make_string_from_bytes (str, 1, len);
Jim Blandy's avatar
Jim Blandy committed
141 142 143
}

DEFUN ("string-to-char", Fstring_to_char, Sstring_to_char, 1, 1, 0,
Karl Heuer's avatar
Karl Heuer committed
144 145
  "Convert arg STRING to a character, the first character of that string.\n\
A multibyte character is handled correctly.")
146 147
  (string)
     register Lisp_Object string;
Jim Blandy's avatar
Jim Blandy committed
148 149 150
{
  register Lisp_Object val;
  register struct Lisp_String *p;
151 152
  CHECK_STRING (string, 0);
  p = XSTRING (string);
Jim Blandy's avatar
Jim Blandy committed
153
  if (p->size)
154 155 156 157 158 159
    {
      if (STRING_MULTIBYTE (string))
	XSETFASTINT (val, STRING_CHAR (p->data, STRING_BYTES (p)));
      else
	XSETFASTINT (val, p->data[0]);
    }
Jim Blandy's avatar
Jim Blandy committed
160
  else
161
    XSETFASTINT (val, 0);
Jim Blandy's avatar
Jim Blandy committed
162 163 164 165
  return val;
}

static Lisp_Object
166 167
buildmark (charpos, bytepos)
     int charpos, bytepos;
Jim Blandy's avatar
Jim Blandy committed
168 169 170
{
  register Lisp_Object mark;
  mark = Fmake_marker ();
171
  set_marker_both (mark, Qnil, charpos, bytepos);
Jim Blandy's avatar
Jim Blandy committed
172 173 174 175 176 177 178 179 180
  return mark;
}

DEFUN ("point", Fpoint, Spoint, 0, 0, 0,
  "Return value of point, as an integer.\n\
Beginning of buffer is position (point-min)")
  ()
{
  Lisp_Object temp;
181
  XSETFASTINT (temp, PT);
Jim Blandy's avatar
Jim Blandy committed
182 183 184 185 186 187 188
  return temp;
}

DEFUN ("point-marker", Fpoint_marker, Spoint_marker, 0, 0, 0,
   "Return value of point, as a marker object.")
  ()
{
189
  return buildmark (PT, PT_BYTE);
Jim Blandy's avatar
Jim Blandy committed
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
}

int
clip_to_bounds (lower, num, upper)
     int lower, num, upper;
{
  if (num < lower)
    return lower;
  else if (num > upper)
    return upper;
  else
    return num;
}

DEFUN ("goto-char", Fgoto_char, Sgoto_char, 1, 1, "NGoto char: ",
  "Set point to POSITION, a number or marker.\n\
Karl Heuer's avatar
Karl Heuer committed
206 207 208 209
Beginning of buffer is position (point-min), end is (point-max).\n\
If the position is in the middle of a multibyte form,\n\
the actual point is set at the head of the multibyte form\n\
except in the case that `enable-multibyte-characters' is nil.")
210 211
  (position)
     register Lisp_Object position;
Jim Blandy's avatar
Jim Blandy committed
212
{
Karl Heuer's avatar
Karl Heuer committed
213 214
  int pos;

215 216
  if (MARKERP (position)
      && current_buffer == XMARKER (position)->buffer)
217 218 219 220 221 222 223 224 225 226 227 228
    {
      pos = marker_position (position);
      if (pos < BEGV)
	SET_PT_BOTH (BEGV, BEGV_BYTE);
      else if (pos > ZV)
	SET_PT_BOTH (ZV, ZV_BYTE);
      else
	SET_PT_BOTH (pos, marker_byte_position (position));

      return position;
    }

229
  CHECK_NUMBER_COERCE_MARKER (position, 0);
Jim Blandy's avatar
Jim Blandy committed
230

Karl Heuer's avatar
Karl Heuer committed
231 232
  pos = clip_to_bounds (BEGV, XINT (position), ZV);
  SET_PT (pos);
233
  return position;
Jim Blandy's avatar
Jim Blandy committed
234 235 236 237 238 239
}

static Lisp_Object
region_limit (beginningp)
     int beginningp;
{
240
  extern Lisp_Object Vmark_even_if_inactive; /* Defined in callint.c. */
Jim Blandy's avatar
Jim Blandy committed
241
  register Lisp_Object m;
242 243 244
  if (!NILP (Vtransient_mark_mode) && NILP (Vmark_even_if_inactive)
      && NILP (current_buffer->mark_active))
    Fsignal (Qmark_inactive, Qnil);
Jim Blandy's avatar
Jim Blandy committed
245
  m = Fmarker_position (current_buffer->mark);
Jim Blandy's avatar
Jim Blandy committed
246
  if (NILP (m)) error ("There is no region now");
247 248
  if ((PT < XFASTINT (m)) == beginningp)
    return (make_number (PT));
Jim Blandy's avatar
Jim Blandy committed
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274
  else
    return (m);
}

DEFUN ("region-beginning", Fregion_beginning, Sregion_beginning, 0, 0, 0,
  "Return position of beginning of region, as an integer.")
  ()
{
  return (region_limit (1));
}

DEFUN ("region-end", Fregion_end, Sregion_end, 0, 0, 0,
  "Return position of end of region, as an integer.")
  ()
{
  return (region_limit (0));
}

DEFUN ("mark-marker", Fmark_marker, Smark_marker, 0, 0, 0,
  "Return this buffer's mark, as a marker object.\n\
Watch out!  Moving this marker changes the mark position.\n\
If you set the marker not to point anywhere, the buffer will have no mark.")
  ()
{
  return current_buffer->mark;
}
275

276 277
/* Return nonzero if POS1 and POS2 have the same value
   for the text property PROP.  */
278 279 280 281 282 283 284 285 286 287 288 289 290 291

static int
text_property_eq (prop, pos1, pos2)
     Lisp_Object prop;
     Lisp_Object pos1, pos2;
{
  Lisp_Object pval1, pval2;

  pval1 = Fget_text_property (pos1, prop, Qnil);
  pval2 = Fget_text_property (pos2, prop, Qnil);

  return EQ (pval1, pval2);
}

292 293 294 295 296
/* Return the direction from which the text-property PROP would be
   inherited by any new text inserted at POS: 1 if it would be
   inherited from the char after POS, -1 if it would be inherited from
   the char before POS, and 0 if from neither.  */

297 298 299 300 301 302 303
static int
text_property_stickiness (prop, pos)
     Lisp_Object prop;
     Lisp_Object pos;
{
  Lisp_Object front_sticky;

304 305
  if (XINT (pos) > BEGV)
    /* Consider previous character.  */
306 307 308
    {
      Lisp_Object prev_pos, rear_non_sticky;

309
      prev_pos = make_number (XINT (pos) - 1);
310 311 312 313 314 315
      rear_non_sticky = Fget_text_property (prev_pos, Qrear_nonsticky, Qnil);

      if (EQ (rear_non_sticky, Qnil)
	  || (CONSP (rear_non_sticky)
	      && !Fmemq (prop, rear_non_sticky)))
	/* PROP is not rear-non-sticky, and since this takes precedence over
316
	   any front-stickiness, PROP is inherited from before.  */
317 318 319
	return -1;
    }

320
  /* Consider following character.  */
321 322 323 324 325
  front_sticky = Fget_text_property (pos, Qfront_sticky, Qnil);

  if (EQ (front_sticky, Qt)
      || (CONSP (front_sticky)
	  && Fmemq (prop, front_sticky)))
326
    /* PROP is inherited from after.  */
327 328
    return 1;

329
  /* PROP is not inherited from either side.  */
330 331 332
  return 0;
}

333
/* Symbol for the text property used to mark fields.  */
334 335
Lisp_Object Qfield;

336 337 338 339
/* Find the field surrounding POS in *BEG and *END.  If POS is nil,
   the value of point is used instead.

   If MERGE_AT_BOUNDARY is nonzero, then if POS is at the very first
340 341 342
   position of a field, then the beginning of the previous field
   is returned instead of the beginning of POS's field (since the end of
   a field is actually also the beginning of the next input
343 344 345 346 347
   field, this behavior is sometimes useful).

   Either BEG or END may be 0, in which case the corresponding value
   is not stored.  */

348 349 350 351 352 353
void
find_field (pos, merge_at_boundary, beg, end)
     Lisp_Object pos;
     Lisp_Object merge_at_boundary;
     int *beg, *end;
{
354 355 356 357
  /* 1 if POS counts as the start of a field.  */
  int at_field_start = 0;
  /* 1 if POS counts as the end of a field.  */
  int at_field_end = 0;
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
  
  if (NILP (pos))
    XSETFASTINT (pos, PT);
  else
    CHECK_NUMBER_COERCE_MARKER (pos, 0);

  if (NILP (merge_at_boundary) && XFASTINT (pos) > BEGV)
    /* See if we need to handle the case where POS is at beginning of a
       field, which can also be interpreted as the end of the previous
       field.  We decide which one by seeing which field the `field'
       property sticks to.  The case where if MERGE_AT_BOUNDARY is
       non-nil (see function comment) is actually the more natural one;
       then we avoid treating the beginning of a field specially.  */
    {
      /* First see if POS is actually *at* a boundary. */
      Lisp_Object after_field, before_field;

      after_field = Fget_text_property (pos, Qfield, Qnil);
376 377
      before_field = Fget_text_property (make_number (XINT (pos) - 1),
					 Qfield, Qnil);
378 379 380 381

      if (! EQ (after_field, before_field))
	/* We are at a boundary, see which direction is inclusive.  */
	{
382
	  int stickiness = text_property_stickiness (Qfield, pos);
383

384 385 386 387 388
	  if (stickiness > 0)
	    at_field_start = 1;
	  else if (stickiness < 0)
	    at_field_end = 1;
	  else
389 390 391
	    /* STICKINESS == 0 means that any inserted text will get a
	       `field' text-property of nil, so check to see if that
	       matches either of the adjacent characters (this being a
392
	       kind of "stickiness by default").  */
393 394
	    {
	      if (NILP (before_field))
395
		at_field_end = 1; /* Sticks to the left.  */
396
	      else if (NILP (after_field))
397
		at_field_start = 1; /* Sticks to the right.  */
398 399 400 401 402 403
	    }
	}
    }

  if (beg)
    {
404
      if (at_field_start)
405 406 407 408 409 410 411 412
	/* POS is at the edge of a field, and we should consider it as
	   the beginning of the following field.  */
	*beg = XFASTINT (pos);
      else
	/* Find the previous field boundary.  */
	{
	  Lisp_Object prev;
	  prev = Fprevious_single_property_change (pos, Qfield, Qnil, Qnil);
413
	  *beg = NILP (prev) ? BEGV : XFASTINT (prev);
414 415 416 417 418
	}
    }

  if (end)
    {
419
      if (at_field_end)
420 421 422 423 424 425 426 427
	/* POS is at the edge of a field, and we should consider it as
	   the end of the previous field.  */
	*end = XFASTINT (pos);
      else
	/* Find the next field boundary.  */
	{
	  Lisp_Object next;
	  next = Fnext_single_property_change (pos, Qfield, Qnil, Qnil);
428
	  *end = NILP (next) ? ZV : XFASTINT (next);
429 430 431 432
	}
    }
}

433
DEFUN ("delete-field", Fdelete_field, Sdelete_field, 0, 1, 0,
434
  "Delete the field surrounding POS.\n\
435
A field is a region of text with the same `field' property.\n\
436
If POS is nil, the value of point is used for POS.")
437 438 439 440 441 442 443
  (pos)
     Lisp_Object pos;
{
  int beg, end;
  find_field (pos, Qnil, &beg, &end);
  if (beg != end)
    del_range (beg, end);
444
  return Qnil;
445 446 447 448 449
}

DEFUN ("field-string", Ffield_string, Sfield_string, 0, 1, 0,
  "Return the contents of the field surrounding POS as a string.\n\
A field is a region of text with the same `field' property.\n\
450
If POS is nil, the value of point is used for POS.")
451 452 453 454 455 456 457 458 459 460 461
  (pos)
     Lisp_Object pos;
{
  int beg, end;
  find_field (pos, Qnil, &beg, &end);
  return make_buffer_string (beg, end, 1);
}

DEFUN ("field-string-no-properties", Ffield_string_no_properties, Sfield_string_no_properties, 0, 1, 0,
  "Return the contents of the field around POS, without text-properties.\n\
A field is a region of text with the same `field' property.\n\
462
If POS is nil, the value of point is used for POS.")
463 464 465 466 467 468 469 470 471 472 473
  (pos)
     Lisp_Object pos;
{
  int beg, end;
  find_field (pos, Qnil, &beg, &end);
  return make_buffer_string (beg, end, 0);
}

DEFUN ("field-beginning", Ffield_beginning, Sfield_beginning, 0, 2, 0,
  "Return the beginning of the field surrounding POS.\n\
A field is a region of text with the same `field' property.\n\
474 475
If POS is nil, the value of point is used for POS.\n\
If ESCAPE-FROM-EDGE is non-nil and POS is at the beginning of its\n\
476 477 478 479 480 481 482 483 484 485 486 487
field, then the beginning of the *previous* field is returned.")
  (pos, escape_from_edge)
     Lisp_Object pos, escape_from_edge;
{
  int beg;
  find_field (pos, escape_from_edge, &beg, 0);
  return make_number (beg);
}

DEFUN ("field-end", Ffield_end, Sfield_end, 0, 2, 0,
  "Return the end of the field surrounding POS.\n\
A field is a region of text with the same `field' property.\n\
488 489
If POS is nil, the value of point is used for POS.\n\
If ESCAPE-FROM-EDGE is non-nil and POS is at the end of its field,\n\
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
then the end of the *following* field is returned.")
  (pos, escape_from_edge)
     Lisp_Object pos, escape_from_edge;
{
  int end;
  find_field (pos, escape_from_edge, 0, &end);
  return make_number (end);
}

DEFUN ("constrain-to-field", Fconstrain_to_field, Sconstrain_to_field, 2, 4, 0,
  "Return the position closest to NEW-POS that is in the same field as OLD-POS.\n\
A field is a region of text with the same `field' property.\n\
If NEW-POS is nil, then the current point is used instead, and set to the\n\
constrained position if that is is different.\n\
\n\
If OLD-POS is at the boundary of two fields, then the allowable\n\
positions for NEW-POS depends on the value of the optional argument\n\
ESCAPE-FROM-EDGE: If ESCAPE-FROM-EDGE is nil, then NEW-POS is\n\
constrained to the field that has the same `field' text-property\n\
as any new characters inserted at OLD-POS, whereas if ESCAPE-FROM-EDGE\n\
is non-nil, NEW-POS is constrained to the union of the two adjacent\n\
fields.\n\
\n\
If the optional argument ONLY-IN-LINE is non-nil and constraining\n\
NEW-POS would move it to a different line, NEW-POS is returned\n\
unconstrained.  This useful for commands that move by line, like\n\
\\[next-line] or \\[beginning-of-line], which should generally respect field boundaries\n\
only in the case where they can still move to the right line.")
  (new_pos, old_pos, escape_from_edge, only_in_line)
     Lisp_Object new_pos, old_pos, escape_from_edge, only_in_line;
{
  /* If non-zero, then the original point, before re-positioning.  */
  int orig_point = 0;

  if (NILP (new_pos))
    /* Use the current point, and afterwards, set it.  */
    {
      orig_point = PT;
      XSETFASTINT (new_pos, PT);
    }

  if (!EQ (new_pos, old_pos) && !text_property_eq (Qfield, new_pos, old_pos))
    /* NEW_POS is not within the same field as OLD_POS; try to
       move NEW_POS so that it is.  */
    {
      int fwd;
      Lisp_Object field_bound;

      CHECK_NUMBER_COERCE_MARKER (new_pos, 0);
      CHECK_NUMBER_COERCE_MARKER (old_pos, 0);

      fwd = (XFASTINT (new_pos) > XFASTINT (old_pos));

      if (fwd)
	field_bound = Ffield_end (old_pos, escape_from_edge);
      else
	field_bound = Ffield_beginning (old_pos, escape_from_edge);

      if (/* If ONLY_IN_LINE is non-nil, we only constrain NEW_POS if doing
	     so would remain within the same line.  */
	  NILP (only_in_line)
	  /* In that case, see if ESCAPE_FROM_EDGE caused FIELD_BOUND
             to jump to the other side of NEW_POS, which would mean
             that NEW_POS is already acceptable, and that we don't
             have to do the line-check.  */
	  || ((XFASTINT (field_bound) < XFASTINT (new_pos)) ? !fwd : fwd)
	  /* If not, see if there's no newline intervening between
             NEW_POS and FIELD_BOUND.  */
	  || (find_before_next_newline (XFASTINT (new_pos),
					XFASTINT (field_bound),
					fwd ? -1 : 1)
	      == XFASTINT (field_bound)))
	/* Constrain NEW_POS to FIELD_BOUND.  */
	new_pos = field_bound;

      if (orig_point && XFASTINT (new_pos) != orig_point)
	/* The NEW_POS argument was originally nil, so automatically set PT. */
	SET_PT (XFASTINT (new_pos));
    }

  return new_pos;
}

573 574 575 576 577
DEFUN ("line-beginning-position", Fline_beginning_position, Sline_beginning_position,
  0, 1, 0,
  "Return the character position of the first character on the current line.\n\
With argument N not nil or 1, move forward N - 1 lines first.\n\
If scan reaches end of buffer, return that position.\n\
578 579 580 581
The scan does not cross a field boundary unless it would move\n\
beyond there to a different line.  And if N is nil or 1,\n\
and scan starts at a field boundary, the scan stops as soon as it starts.\n\n\
This function does not move point.")
582 583 584
  (n)
     Lisp_Object n;
{
585
  register int orig, orig_byte, end;
586 587 588 589 590 591 592

  if (NILP (n))
    XSETFASTINT (n, 1);
  else
    CHECK_NUMBER (n, 0);

  orig = PT;
593
  orig_byte = PT_BYTE;
594 595
  Fforward_line (make_number (XINT (n) - 1));
  end = PT;
596

597
  SET_PT_BOTH (orig, orig_byte);
Jim Blandy's avatar
Jim Blandy committed
598

599
  /* Return END constrained to the current input field.  */
600 601 602
  return Fconstrain_to_field (make_number (end), make_number (orig),
			      XINT (n) != 1 ? Qt : Qnil,
			      Qt);
603 604 605 606 607 608 609 610 611 612 613
}

DEFUN ("line-end-position", Fline_end_position, Sline_end_position,
  0, 1, 0,
  "Return the character position of the last character on the current line.\n\
With argument N not nil or 1, move forward N - 1 lines first.\n\
If scan reaches end of buffer, return that position.\n\
This function does not move point.")
  (n)
     Lisp_Object n;
{
614 615 616
  int end_pos;
  register int orig = PT;

617 618 619 620 621
  if (NILP (n))
    XSETFASTINT (n, 1);
  else
    CHECK_NUMBER (n, 0);

622 623 624 625 626
  end_pos = find_before_next_newline (orig, 0, XINT (n) - (XINT (n) <= 0));

  /* Return END_POS constrained to the current input field.  */
  return
    Fconstrain_to_field (make_number (end_pos), make_number (orig), Qnil, Qt);
627 628
}

Jim Blandy's avatar
Jim Blandy committed
629 630 631
Lisp_Object
save_excursion_save ()
{
632 633
  register int visible = (XBUFFER (XWINDOW (selected_window)->buffer)
			  == current_buffer);
Jim Blandy's avatar
Jim Blandy committed
634 635

  return Fcons (Fpoint_marker (),
636
		Fcons (Fcopy_marker (current_buffer->mark, Qnil),
637 638
		       Fcons (visible ? Qt : Qnil,
			      current_buffer->mark_active)));		       
Jim Blandy's avatar
Jim Blandy committed
639 640 641 642
}

Lisp_Object
save_excursion_restore (info)
643
     Lisp_Object info;
Jim Blandy's avatar
Jim Blandy committed
644
{
645 646
  Lisp_Object tem, tem1, omark, nmark;
  struct gcpro gcpro1, gcpro2, gcpro3;
Jim Blandy's avatar
Jim Blandy committed
647 648 649 650 651 652

  tem = Fmarker_buffer (Fcar (info));
  /* If buffer being returned to is now deleted, avoid error */
  /* Otherwise could get error here while unwinding to top level
     and crash */
  /* In that case, Fmarker_buffer returns nil now.  */
Jim Blandy's avatar
Jim Blandy committed
653
  if (NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
654
    return Qnil;
655 656 657 658

  omark = nmark = Qnil;
  GCPRO3 (info, omark, nmark);

Jim Blandy's avatar
Jim Blandy committed
659 660 661 662 663
  Fset_buffer (tem);
  tem = Fcar (info);
  Fgoto_char (tem);
  unchain_marker (tem);
  tem = Fcar (Fcdr (info));
664
  omark = Fmarker_position (current_buffer->mark);
Jim Blandy's avatar
Jim Blandy committed
665
  Fset_marker (current_buffer->mark, tem, Fcurrent_buffer ());
666
  nmark = Fmarker_position (tem);
Jim Blandy's avatar
Jim Blandy committed
667 668
  unchain_marker (tem);
  tem = Fcdr (Fcdr (info));
669 670 671 672
#if 0 /* We used to make the current buffer visible in the selected window
	 if that was true previously.  That avoids some anomalies.
	 But it creates others, and it wasn't documented, and it is simpler
	 and cleaner never to alter the window/buffer connections.  */
673 674
  tem1 = Fcar (tem);
  if (!NILP (tem1)
675
      && current_buffer != XBUFFER (XWINDOW (selected_window)->buffer))
Jim Blandy's avatar
Jim Blandy committed
676
    Fswitch_to_buffer (Fcurrent_buffer (), Qnil);
677
#endif /* 0 */
678 679 680

  tem1 = current_buffer->mark_active;
  current_buffer->mark_active = Fcdr (tem);
681 682
  if (!NILP (Vrun_hooks))
    {
683 684
      /* If mark is active now, and either was not active
	 or was at a different place, run the activate hook.  */
685
      if (! NILP (current_buffer->mark_active))
686 687 688 689 690
	{
	  if (! EQ (omark, nmark))
	    call1 (Vrun_hooks, intern ("activate-mark-hook"));
	}
      /* If mark has ceased to be active, run deactivate hook.  */
691 692 693
      else if (! NILP (tem1))
	call1 (Vrun_hooks, intern ("deactivate-mark-hook"));
    }
694
  UNGCPRO;
Jim Blandy's avatar
Jim Blandy committed
695 696 697 698 699 700 701
  return Qnil;
}

DEFUN ("save-excursion", Fsave_excursion, Ssave_excursion, 0, UNEVALLED, 0,
  "Save point, mark, and current buffer; execute BODY; restore those things.\n\
Executes BODY just like `progn'.\n\
The values of point, mark and the current buffer are restored\n\
702
even in case of abnormal exit (throw or error).\n\
703 704 705 706 707 708
The state of activation of the mark is also restored.\n\
\n\
This construct does not save `deactivate-mark', and therefore\n\
functions that change the buffer will still cause deactivation\n\
of the mark at the end of the command.  To prevent that, bind\n\
`deactivate-mark' with `let'.")
Jim Blandy's avatar
Jim Blandy committed
709 710 711 712 713 714 715
  (args)
     Lisp_Object args;
{
  register Lisp_Object val;
  int count = specpdl_ptr - specpdl;

  record_unwind_protect (save_excursion_restore, save_excursion_save ());
716 717 718 719 720 721 722 723 724 725 726 727 728 729

  val = Fprogn (args);
  return unbind_to (count, val);
}

DEFUN ("save-current-buffer", Fsave_current_buffer, Ssave_current_buffer, 0, UNEVALLED, 0,
  "Save the current buffer; execute BODY; restore the current buffer.\n\
Executes BODY just like `progn'.")
  (args)
     Lisp_Object args;
{
  register Lisp_Object val;
  int count = specpdl_ptr - specpdl;

730
  record_unwind_protect (set_buffer_if_live, Fcurrent_buffer ());
731

Jim Blandy's avatar
Jim Blandy committed
732 733 734 735
  val = Fprogn (args);
  return unbind_to (count, val);
}

736 737 738 739 740
DEFUN ("buffer-size", Fbufsize, Sbufsize, 0, 1, 0,
  "Return the number of characters in the current buffer.\n\
If BUFFER, return the number of characters in that buffer instead.")
  (buffer)
     Lisp_Object buffer;
Jim Blandy's avatar
Jim Blandy committed
741
{
742 743
  if (NILP (buffer))
    return make_number (Z - BEG);
744 745 746 747 748 749
  else
    {
      CHECK_BUFFER (buffer, 1);
      return make_number (BUF_Z (XBUFFER (buffer))
			  - BUF_BEG (XBUFFER (buffer)));
    }
Jim Blandy's avatar
Jim Blandy committed
750 751 752 753
}

DEFUN ("point-min", Fpoint_min, Spoint_min, 0, 0, 0,
  "Return the minimum permissible value of point in the current buffer.\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
754
This is 1, unless narrowing (a buffer restriction) is in effect.")
Jim Blandy's avatar
Jim Blandy committed
755 756 757
  ()
{
  Lisp_Object temp;
758
  XSETFASTINT (temp, BEGV);
Jim Blandy's avatar
Jim Blandy committed
759 760 761 762 763
  return temp;
}

DEFUN ("point-min-marker", Fpoint_min_marker, Spoint_min_marker, 0, 0, 0,
  "Return a marker to the minimum permissible value of point in this buffer.\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
764
This is the beginning, unless narrowing (a buffer restriction) is in effect.")
Jim Blandy's avatar
Jim Blandy committed
765 766
  ()
{
767
  return buildmark (BEGV, BEGV_BYTE);
Jim Blandy's avatar
Jim Blandy committed
768 769 770 771
}

DEFUN ("point-max", Fpoint_max, Spoint_max, 0, 0, 0,
  "Return the maximum permissible value of point in the current buffer.\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
772 773
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)\n\
is in effect, in which case it is less.")
Jim Blandy's avatar
Jim Blandy committed
774 775 776
  ()
{
  Lisp_Object temp;
777
  XSETFASTINT (temp, ZV);
Jim Blandy's avatar
Jim Blandy committed
778 779 780 781 782
  return temp;
}

DEFUN ("point-max-marker", Fpoint_max_marker, Spoint_max_marker, 0, 0, 0,
  "Return a marker to the maximum permissible value of point in this buffer.\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
783 784
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)\n\
is in effect, in which case it is less.")
Jim Blandy's avatar
Jim Blandy committed
785 786
  ()
{
787
  return buildmark (ZV, ZV_BYTE);
Jim Blandy's avatar
Jim Blandy committed
788 789
}

790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
DEFUN ("gap-position", Fgap_position, Sgap_position, 0, 0, 0,
  "Return the position of the gap, in the current buffer.\n\
See also `gap-size'.")
  ()
{
  Lisp_Object temp;
  XSETFASTINT (temp, GPT);
  return temp;
}

DEFUN ("gap-size", Fgap_size, Sgap_size, 0, 0, 0,
  "Return the size of the current buffer's gap.\n\
See also `gap-position'.")
  ()
{
  Lisp_Object temp;
  XSETFASTINT (temp, GAP_SIZE);
  return temp;
}

810
DEFUN ("position-bytes", Fposition_bytes, Sposition_bytes, 1, 1, 0,
811 812
  "Return the byte position for character position POSITION.\n\
If POSITION is out of range, the value is nil.")
813
  (position)
814
     Lisp_Object position;
815
{
816
  CHECK_NUMBER_COERCE_MARKER (position, 1);
817 818
  if (XINT (position) < BEG || XINT (position) > Z)
    return Qnil;
819
  return make_number (CHAR_TO_BYTE (XINT (position)));
820
}
821 822

DEFUN ("byte-to-position", Fbyte_to_position, Sbyte_to_position, 1, 1, 0,
823 824
  "Return the character position for byte position BYTEPOS.\n\
If BYTEPOS is out of range, the value is nil.")
825 826 827 828
  (bytepos)
     Lisp_Object bytepos;
{
  CHECK_NUMBER (bytepos, 1);
829 830
  if (XINT (bytepos) < BEG_BYTE || XINT (bytepos) > Z_BYTE)
    return Qnil;
831 832
  return make_number (BYTE_TO_CHAR (XINT (bytepos)));
}
833

Jim Blandy's avatar
Jim Blandy committed
834 835
DEFUN ("following-char", Ffollowing_char, Sfollowing_char, 0, 0, 0,
  "Return the character following point, as a number.\n\
Karl Heuer's avatar
Karl Heuer committed
836 837 838 839
At the end of the buffer or accessible region, return 0.\n\
If `enable-multibyte-characters' is nil or point is not\n\
 at character boundary,  multibyte form is ignored,\n\
 and only one byte following point is returned as a character.")
Jim Blandy's avatar
Jim Blandy committed
840 841 842
  ()
{
  Lisp_Object temp;
843
  if (PT >= ZV)
844
    XSETFASTINT (temp, 0);
Jim Blandy's avatar
Jim Blandy committed
845
  else
846
    XSETFASTINT (temp, FETCH_CHAR (PT_BYTE));
Jim Blandy's avatar
Jim Blandy committed
847 848 849
  return temp;
}

Jim Blandy's avatar
Jim Blandy committed
850 851
DEFUN ("preceding-char", Fprevious_char, Sprevious_char, 0, 0, 0,
  "Return the character preceding point, as a number.\n\
Karl Heuer's avatar
Karl Heuer committed
852 853 854 855
At the beginning of the buffer or accessible region, return 0.\n\
If `enable-multibyte-characters' is nil or point is not\n\
 at character boundary, multi-byte form is ignored,\n\
 and only one byte preceding point is returned as a character.")
Jim Blandy's avatar
Jim Blandy committed
856 857 858
  ()
{
  Lisp_Object temp;
859
  if (PT <= BEGV)
860
    XSETFASTINT (temp, 0);
Karl Heuer's avatar
Karl Heuer committed
861 862
  else if (!NILP (current_buffer->enable_multibyte_characters))
    {
863
      int pos = PT_BYTE;
Karl Heuer's avatar
Karl Heuer committed
864 865 866
      DEC_POS (pos);
      XSETFASTINT (temp, FETCH_CHAR (pos));
    }
Jim Blandy's avatar
Jim Blandy committed
867
  else
868
    XSETFASTINT (temp, FETCH_BYTE (PT_BYTE - 1));
Jim Blandy's avatar
Jim Blandy committed
869 870 871 872
  return temp;
}

DEFUN ("bobp", Fbobp, Sbobp, 0, 0, 0,
873
  "Return t if point is at the beginning of the buffer.\n\
Jim Blandy's avatar
Jim Blandy committed
874 875 876
If the buffer is narrowed, this means the beginning of the narrowed part.")
  ()
{
877
  if (PT == BEGV)
Jim Blandy's avatar
Jim Blandy committed
878 879 880 881 882
    return Qt;
  return Qnil;
}

DEFUN ("eobp", Feobp, Seobp, 0, 0, 0,
883
  "Return t if point is at the end of the buffer.\n\
Jim Blandy's avatar
Jim Blandy committed
884 885 886
If the buffer is narrowed, this means the end of the narrowed part.")
  ()
{
887
  if (PT == ZV)
Jim Blandy's avatar
Jim Blandy committed
888 889 890 891 892
    return Qt;
  return Qnil;
}

DEFUN ("bolp", Fbolp, Sbolp, 0, 0, 0,
893
  "Return t if point is at the beginning of a line.")
Jim Blandy's avatar
Jim Blandy committed
894 895
  ()
{
896
  if (PT == BEGV || FETCH_BYTE (PT_BYTE - 1) == '\n')
Jim Blandy's avatar
Jim Blandy committed
897 898 899 900 901
    return Qt;
  return Qnil;
}

DEFUN ("eolp", Feolp, Seolp, 0, 0, 0,
902
  "Return t if point is at the end of a line.\n\
Jim Blandy's avatar
Jim Blandy committed
903 904 905
`End of a line' includes point being at the end of the buffer.")
  ()
{
906
  if (PT == ZV || FETCH_BYTE (PT_BYTE) == '\n')
Jim Blandy's avatar
Jim Blandy committed
907 908 909 910
    return Qt;
  return Qnil;
}

911
DEFUN ("char-after", Fchar_after, Schar_after, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
912 913
  "Return character in current buffer at position POS.\n\
POS is an integer or a buffer pointer.\n\
914
If POS is out of range, the value is nil.")
Jim Blandy's avatar
Jim Blandy committed
915 916 917
  (pos)
     Lisp_Object pos;
{
918
  register int pos_byte;
Jim Blandy's avatar
Jim Blandy committed
919

920
  if (NILP (pos))
921 922
    {
      pos_byte = PT_BYTE;
923
      XSETFASTINT (pos, PT);
924 925 926
    }

  if (MARKERP (pos))
927 928 929 930 931
    {
      pos_byte = marker_byte_position (pos);
      if (pos_byte < BEGV_BYTE || pos_byte >= ZV_BYTE)
	return Qnil;
    }
932 933 934
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
935
      if (XINT (pos) < BEGV || XINT (pos) >= ZV)
936
	return Qnil;
937 938
      
      pos_byte = CHAR_TO_BYTE (XINT (pos));
939
    }
Jim Blandy's avatar
Jim Blandy committed
940

941
  return make_number (FETCH_CHAR (pos_byte));
Jim Blandy's avatar
Jim Blandy committed
942
}
Karl Heuer's avatar
Karl Heuer committed
943

944
DEFUN ("char-before", Fchar_before, Schar_before, 0, 1, 0,
Karl Heuer's avatar
Karl Heuer committed
945 946
  "Return character in current buffer preceding position POS.\n\
POS is an integer or a buffer pointer.\n\
947
If POS is out of range, the value is nil.")
Karl Heuer's avatar
Karl Heuer committed
948 949 950 951
  (pos)
     Lisp_Object pos;
{
  register Lisp_Object val;
952
  register int pos_byte;
Karl Heuer's avatar
Karl Heuer committed
953

954
  if (NILP (pos))
955 956
    {
      pos_byte = PT_BYTE;
957
      XSETFASTINT (pos, PT);
958 959 960
    }

  if (MARKERP (pos))
961 962 963 964 965 966
    {
      pos_byte = marker_byte_position (pos);

      if (pos_byte <= BEGV_BYTE || pos_byte > ZV_BYTE)
	return Qnil;
    }
967 968 969
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
Karl Heuer's avatar
Karl Heuer committed
970

971
      if (XINT (pos) <= BEGV || XINT (pos) > ZV)
972 973
	return Qnil;

974
      pos_byte = CHAR_TO_BYTE (XINT (pos));
975
    }
Karl Heuer's avatar
Karl Heuer committed
976 977 978

  if (!NILP (current_buffer->enable_multibyte_characters))
    {
979 980
      DEC_POS (pos_byte);
      XSETFASTINT (val, FETCH_CHAR (pos_byte));
Karl Heuer's avatar
Karl Heuer committed
981 982 983
    }
  else
    {
984 985
      pos_byte--;
      XSETFASTINT (val, FETCH_BYTE (pos_byte));
Karl Heuer's avatar
Karl Heuer committed
986 987 988
    }
   return val;
}
Jim Blandy's avatar
Jim Blandy committed
989

Morten Welinder's avatar
Morten Welinder committed
990
DEFUN ("user-login-name", Fuser_login_name, Suser_login_name, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
991 992
  "Return the name under which the user logged in, as a string.\n\
This is based on the effective uid, not the real uid.\n\
993
Also, if the environment variable LOGNAME or USER is set,\n\
Morten Welinder's avatar
Morten Welinder committed
994 995 996 997 998
that determines the value of this function.\n\n\
If optional argument UID is an integer, return the login name of the user\n\
with that uid, or nil if there is no such user.")
  (uid)
     Lisp_Object uid;
Jim Blandy's avatar
Jim Blandy committed
999
{
Morten Welinder's avatar
Morten Welinder committed
1000 1001
  struct passwd *pw;

1002 1003 1004
  /* Set up the user name info if we didn't do it before.
     (That can happen if Emacs is dumpable
     but you decide to run `temacs -l loadup' and not dump.  */
1005
  if (INTEGERP (Vuser_login_name))
1006
    init_editfns ();
Morten Welinder's avatar
Morten Welinder committed
1007 1008

  if (NILP (uid))
1009
    return Vuser_login_name;
Morten Welinder's avatar
Morten Welinder committed
1010 1011 1012 1013

  CHECK_NUMBER (uid, 0);
  pw = (struct passwd *) getpwuid (XINT (uid));
  return (pw ? build_string (pw->pw_name) : Qnil);
Jim Blandy's avatar
Jim Blandy committed
1014 1015 1016 1017 1018
}

DEFUN ("user-real-login-name", Fuser_real_login_name, Suser_real_login_name,
  0, 0, 0,
  "Return the name of the user's real uid, as a string.\n\
1019
This ignores the environment variables LOGNAME and USER, so it differs from\n\
Karl Heuer's avatar
Karl Heuer committed
1020
`user-login-name' when running under `su'.")
Jim Blandy's avatar
Jim Blandy committed
1021 1022
  ()
{
1023 1024 1025
  /* Set up the user name info if we didn't do it before.
     (That can happen if Emacs is dumpable
     but you decide to run `temacs -l loadup' and not dump.  */
1026
  if (INTEGERP (Vuser_login_name))
1027
    init_editfns ();
1028
  return Vuser_real_login_name;
Jim Blandy's avatar
Jim Blandy committed
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
}

DEFUN ("user-uid", Fuser_uid, Suser_uid, 0, 0, 0,
  "Return the effective uid of Emacs, as an integer.")
  ()
{
  return make_number (geteuid ());
}

DEFUN ("user-real-uid", Fuser_real_uid, Suser_real_uid, 0, 0, 0,
  "Return the real uid of Emacs, as an integer.")
  ()
{
  return make_number (getuid ());
}

1045 1046
DEFUN ("user-full-name", Fuser_full_name, Suser_full_name, 0, 1, 0,
  "Return the full name of the user logged in, as a string.\n\
Karl Heuer's avatar
Karl Heuer committed
1047 1048 1049
If the full name corresponding to Emacs's userid is not known,\n\
return \"unknown\".\n\
\n\
1050
If optional argument UID is an integer, return the full name of the user\n\
Karl Heuer's avatar
Karl Heuer committed
1051
with that uid, or nil if there is no such user.\n\
1052
If UID is a string, return the full name of the user with that login\n\
Karl Heuer's avatar
Karl Heuer committed
1053
name, or nil if there is no such user.")
1054 1055
  (uid)
     Lisp_Object uid;
Jim Blandy's avatar
Jim Blandy committed
1056
{
1057
  struct passwd *pw;
1058
  register unsigned char *p, *q;
1059 1060
  extern char *index ();
  Lisp_Object full;
1061 1062

  if (NILP (uid))
1063 1064 1065 1066 1067 1068 1069
    return Vuser_full_name; 
  else if (NUMBERP (uid))
    pw = (struct passwd *) getpwuid (XINT (uid));
  else if (STRINGP (uid)) 
    pw = (struct passwd *) getpwnam (XSTRING (uid)->data);
  else
    error ("Invalid UID specification");
1070

1071
  if (!pw)
1072
    return Qnil;
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
  
  p = (unsigned char *) USER_FULL_NAME;
  /* Chop off everything after the first comma. */
  q = (unsigned char *) index (p, ',');
  full = make_string (p, q ? q - p : strlen (p));
  
#ifdef AMPERSAND_FULL_NAME
  p = XSTRING (full)->data;
  q = (unsigned char *) index (p, '&');
  /* Substitute the login name for the &, upcasing the first character.  */
  if (q)
    {
1085
      register unsigned char *r;
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
      Lisp_Object login;

      login = Fuser_login_name (make_number (pw->pw_uid));
      r = (unsigned char *) alloca (strlen (p) + XSTRING (login)->size + 1);
      bcopy (p, r, q - p);
      r[q - p] = 0;
      strcat (r, XSTRING (login)->data);
      r[q - p] = UPCASE (r[q - p]);
      strcat (r, q + 1);
      full = build_string (r);
    }
#endif /* AMPERSAND_FULL_NAME */

  return full;
Jim Blandy's avatar
Jim Blandy committed
1100 1101 1102 1103 1104 1105 1106 1107 1108
}

DEFUN ("system-name", Fsystem_name, Ssystem_name, 0, 0, 0,
  "Return the name of the machine you are running on, as a string.")
  ()
{
  return Vsystem_name;
}

1109 1110 1111 1112
/* For the benefit of callers who don't want to include lisp.h */
char *
get_system_name ()
{
1113 1114 1115 1116
  if (STRINGP (Vsystem_name))
    return (char *) XSTRING (Vsystem_name)->data;
  else
    return "";
1117 1118
}