/* Lisp functions pertaining to editing.
   Copyright (C) 1985 Richard M. Stallman.

This file is part of GNU Emacs.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY.  No author or distributor
accepts responsibility to anyone for the consequences of using it
or for whether it serves any particular purpose or works at all,
unless he says so in writing.  Refer to the GNU Emacs General Public
License for full details.

Everyone is granted permission to copy, modify and redistribute
GNU Emacs, but only under the conditions described in the
GNU Emacs General Public License.   A copy of this license is
supposed to have been given to you along with GNU Emacs so you
can know your rights and responsibilities.  It should be in a
file named COPYING.  Among other things, the copyright notice
and this notice must be preserved on all copies.  */


#include "config.h"
#include <pwd.h>
#include "lisp.h"
#include "buffer.h"
#include "window.h"

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

Lisp_Object ml_apply ();

/* Some static data, and a function to initialize it for each run */

static char user_real_name[12];	/* login ID of current user */
static char user_full_name[50];	/* full name of current user */

static char system_name[40];
static char *user_name;

void
init_editfns ()
{
  register char *p, *q, *r;
  register int c;
  int first;
  struct passwd *pw;	/* password entry for the current user */
  extern char *index ();

  /* Don't bother with this on initial start when just dumping out */
  if (!NULL (Vpurify_flag))
    return;

  pw = (struct passwd *) getpwuid (getuid ());
  strncpy (user_real_name, pw->pw_name, sizeof user_real_name);

  user_name = (char *) getenv ("USER");
#ifdef USG
  if (!user_name)
    user_name = (char *) getenv ("LOGNAME");		/* USG equivalent */
#endif
  if (!user_name)
    user_name = user_real_name;

  if (strcmp (user_name, user_real_name))
    pw = (struct passwd *) getpwnam (user_name);
  
#ifndef AMPERSAND_FULL_NAME
  if (pw == 0)
    strcpy (user_full_name, "unknown");
  else
    strncpy (user_full_name, USER_FULL_NAME, sizeof user_full_name);
  p = index (user_full_name, ',');
  if (p) *p = 0;
#else
  if (pw == 0)
    p = "unknown";
  else
    p = USER_FULL_NAME;
  q = user_full_name; r = user_name; first = 1;

  for (; (*p != 0) && (*p != ','); p++)
    {
      if (*p == '&')
	{
	  if (*r != 0)
	    {
	      *q = *r++;
	      if ((*q >= 'a') && (*q <= 'z'))
		*q -= 32;
	      for (q++; *r != 0; r++)
		{
		  if (q == &user_full_name[sizeof user_full_name - 1])
		    break;
		  *q++ = *r;
		}
	    }
	}
      else
	*q++ = *p;
      if (q == &user_full_name[sizeof user_full_name - 2])
	break;
    }
  *q = 0;
#endif /* AMPERSAND_FULL_NAME */

  p = (char *) get_system_name ();
  if (p == 0 || *p == 0)
    p = "Bogus System Name";
  strncpy (system_name, p, sizeof system_name);
  p = system_name;
  while (*p)
    {
      if (*p < ' ')
	*p = 0;
      else
	if (*p == ' ')
	  *p = '-';
      p++;
    }
}

DEFUN ("char-to-string", Fchar_to_string, Schar_to_string, 1, 1, 0,
  "Convert arg CHAR to a string containing that character.")
  (n)
     Lisp_Object n;
{
  char c;
  CHECK_NUMBER (n, 0);

  c = XINT (n);
  return make_string (&c, 1);
}

DEFUN ("string-to-char", Fstring_to_char, Sstring_to_char, 1, 1, 0,
  "Convert arg STRING to a character, the first character of that string.")
  (str)
     Lisp_Object str;
{
  Lisp_Object val;
  CHECK_STRING (str, 0);

  if (XSTRING (str)->size)
    XFASTINT (val) = ((unsigned char *) XSTRING (str)->data)[0];
  else
    XFASTINT (val) = 0;
  return val;
}

static Lisp_Object
buildmark (val)
{
  Lisp_Object mark;
  mark = Fmake_marker ();
  Fset_marker (mark, make_number (val), Qnil);
  return mark;
}

DEFSIMPLE ("point", Fpoint, Spoint,
  "Return value of point, as an integer.\n\
Beginning of buffer is position (point-min)",
	   Lisp_Int, XSETINT, point)

DEFUN ("point-marker", Fpoint_marker, Spoint_marker, 0, 0, 0,
   "Return value of point, as a marker object.")
  ()
{
  return buildmark (point);
}

DEFUN ("goto-char", Fgoto_char, Sgoto_char, 1, 1, "nGoto char: ",
  "One arg, a number.  Set point to that number.\n\
Beginning of buffer is position (point-min), end is (point-max).")
  (n)
     Lisp_Object n;
{
  int charno;
  CHECK_NUMBER_COERCE_MARKER (n, 0);
  charno = XINT (n);
  if (charno < FirstCharacter) charno = FirstCharacter;
  if (charno > NumCharacters) charno = NumCharacters + 1;
  SetPoint (charno);
  return n;
}

DEFUN ("region-beginning", Fregion_beginning, Sregion_beginning, 0, 0, 0,
  "Return position of beginning of region, as an integer.")
  ()
{
  register int tem;
  if (NULL (bf_cur->mark))
    error ("There is no region now");
  tem = marker_position (bf_cur->mark);
  return make_number (min (point, tem));
}

DEFUN ("region-end", Fregion_end, Sregion_end, 0, 0, 0,
  "Return position of end of region, as an integer.")
  ()
{
  register int tem;
  if (NULL (bf_cur->mark))
    error ("There is no region now");
  tem = marker_position (bf_cur->mark);
  return make_number (max (point, tem));
}

DEFUN ("mark", Fmark, Smark, 0, 0, 0,
  "Return this buffer's mark value as integer, or nil if no mark.")
  ()
{
  if (!NULL (bf_cur->mark))
    return Fmarker_position (bf_cur->mark);
  return Qnil;
}

DEFUN ("mark-marker", Fmark_marker, Smark_marker, 0, 0, 0,
  "Return this buffer's mark, as a marker object, or nil if no mark.\n\
Watch out!  Moving this marker changes the buffer's mark.")
  ()
{
  return bf_cur->mark;
}

DEFUN ("set-mark", Fset_mark, Sset_mark, 1, 1, "",
  "Set this buffer's mark to POS;\n\
Argument is character position, or nil to clear out the mark.")
  (pos)
     Lisp_Object pos;
{
  if (NULL (pos))
    {
      bf_cur->mark = Qnil;
      return Qnil;
    }
  CHECK_NUMBER_COERCE_MARKER (pos, 0);

  if (NULL (bf_cur->mark))
    bf_cur->mark = Fmake_marker ();

  Fset_marker (bf_cur->mark, pos, Qnil);
  return pos;
}

Lisp_Object
save_excursion_save ()
{
  Lisp_Object oldpoint, oldmark;
  int visible = XBUFFER (XWINDOW (selected_window)->buffer) == bf_cur;

  oldpoint = Fpoint_marker ();

  if (!NULL (bf_cur->mark))
    oldmark = Fcopy_marker (bf_cur->mark);
  else
    oldmark = Qnil;

  return Fcons (oldpoint, Fcons (oldmark, visible ? Qt : Qnil));
}

Lisp_Object
save_excursion_restore (info)
     Lisp_Object info;
{
  Lisp_Object tem;

  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.  */
  if (NULL (tem))
    return Qnil;
  Fset_buffer (tem);
  Fgoto_char (Fcar (info));
  unchain_marker (Fcar (info));
  tem = Fcar (Fcdr (info));
  Fset_mark (tem);
  if (!NULL (tem))
    unchain_marker (tem);
  tem = Fcdr (Fcdr (info));
  if (!NULL (tem) && bf_cur != XBUFFER (XWINDOW (selected_window)->buffer))
    Fswitch_to_buffer (Fcurrent_buffer (), Qnil);
  return Qnil;
}

DEFUN ("save-excursion", Fsave_excursion, Ssave_excursion, 0, UNEVALLED, 0,
  "Save point (and mark), execute BODY, then restore point and mark.\n\
Executes BODY just like PROGN.  Point and mark values are restored\n\
even in case of abnormal exit (throw or error).")
  (args)
     Lisp_Object args;
{
  Lisp_Object val;
  int count = specpdl_ptr - specpdl;

  record_unwind_protect (save_excursion_restore, save_excursion_save ());
			 
  val = Fprogn (args);
  unbind_to (count);
  return val;
}

DEFSIMPLE ("buffer-size", Fbufsize, Sbufsize,
	   "Return the number of characters in the current buffer.",
	   Lisp_Int, XSETINT, bf_s1 + bf_s2)

DEFSIMPLE ("point-min", Fpoint_min, Spoint_min,
	   "Return the minimum permissible value of point in the current buffer.\n\
This is 1, unless a clipping restriction is in effect.",
	   Lisp_Int, XSETINT, FirstCharacter)

DEFUN ("point-min-marker", Fpoint_min_marker, Spoint_min_marker, 0, 0, 0,
  "Return a marker to the beginning of the currently visible part of the buffer.\n\
This is the beginning, unless a clipping restriction is in effect.")
  ()
{
  return buildmark (FirstCharacter);
}

DEFSIMPLE ("point-max", Fpoint_max, Spoint_max,
  "Return the maximum permissible value of point in the current buffer.\n\
This is (1+ (buffer-size)), unless a clipping restriction is in effect,\n\
in which case it is less.",
	   Lisp_Int, XSETINT, NumCharacters+1)

DEFUN ("point-max-marker", Fpoint_max_marker, Spoint_max_marker, 0, 0, 0,
  "Return a marker to the end of the currently visible part of the buffer.\n\
This is the actual end, unless a clipping restriction is in effect.")
  ()
{
  return buildmark (NumCharacters+1);
}

DEFSIMPLE ("following-char", Ffollchar, Sfollchar,
	   "Return the character following point, as a number.",
	   Lisp_Int, XSETINT, point>NumCharacters ? 0 : CharAt(point))
DEFSIMPLE ("preceding-char", Fprevchar, Sprevchar,
	   "Return the character preceding point, as a number.",
	   Lisp_Int, XSETINT, point<=FirstCharacter ? 0 : CharAt(point-1))

DEFPRED ("bobp", Fbobp, Sbobp,
  "Return T if point is at the beginning of the buffer.\n\
If the buffer is narrowed, this means the beginning of the narrowed part.",
	 point<=FirstCharacter)
DEFPRED ("eobp", Feobp, Seobp,
  "Return T if point is at the end of the buffer.\n\
If the buffer is narrowed, this means the end of the narrowed part.",
	 point>NumCharacters)
DEFPRED ("bolp", Fbolp, Sbolp,
  "Return T if point is at the beginning of a line.",
	 point<=FirstCharacter || CharAt(point-1)=='\n')
DEFPRED ("eolp", Feolp, Seolp,
  "Return T if point is at the end of a line.\n\
`End of a line' includes point being at the end of the buffer.",
	 point>NumCharacters || CharAt(point)=='\n')

DEFUN ("char-after", Fchar_after, Schar_after, 1, 1, 0,
  "One arg, POS, a number.  Return the character in the current buffer\n\
at position POS.\n\
If POS is out of range, the value is NIL.")
  (pos)
     Lisp_Object pos;
{
  Lisp_Object val;
  CHECK_NUMBER_COERCE_MARKER (pos, 0);
  if (XINT (pos) < FirstCharacter || XINT (pos) > NumCharacters) return Qnil;

  XFASTINT (val) = CharAt(XINT (pos));
  return val;
}

DEFUN ("user-login-name", Fuser_login_name, Suser_login_name, 0, 0, "",
  "Return the name under which user logged in, as a string.")
  ()
{
  return build_string (user_name);
}

DEFUN ("user-real-login-name", Fuser_real_login_name, Suser_real_login_name,
  0, 0, "",
  "Return the name of the user's real uid, as a string.\n\
Differs from user-login-name when running under su.")
  ()
{
  return build_string (user_real_name);
}

DEFUN ("user-full-name", Fuser_full_name, Suser_full_name, 0, 0, "",
  "Return the full name of the user logged in, as a string.")
  ()
{
  return build_string (user_full_name);
}

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

DEFUN ("current-time-string", Fcurrent_time_string, Scurrent_time_string, 0, 0, 0,
  "Return the current time, as a human-readable string.")
  ()
{
  long now = time ( (long *) 0);
  char *tem = (char *) ctime (&now);
  tem [24] = 0;
  return build_string (tem);
}

DEFUN ("insert", Finsert, Sinsert, 0, MANY, 0,
  "Any number of args, strings or chars.  Insert them after point, moving point forward.")
  (nargs, args)
     int nargs;
     Lisp_Object *args;
{
  int argnum;
  Lisp_Object tem;
  char str[1];

  for (argnum = 0; argnum < nargs; argnum++)
    {
      tem = args[argnum];
    retry:
      if (XTYPE (tem) == Lisp_Int)
	{
	  str[0] = XINT (tem);
	  InsCStr (str, 1);
	}
      else if (XTYPE (tem) == Lisp_String)
	{
	  InsCStr (XSTRING (tem)->data, XSTRING (tem)->size);
	}
      else
	{
	  tem = wrong_type_argument (Qchar_or_string_p, tem);
	  goto retry;
	}
    }
  return Qnil;
}

DEFUN ("insert-before-markers", Finsert_before_markers, Sinsert_before_markers, 0, MANY, 0,
  "Any number of args, strings or chars.  Insert them after point,\n\
moving point forward.  Also, any markers pointing at the insertion point\n\
get relocated to point after the newly inserted text.")
  (nargs, args)
     int nargs;
     Lisp_Object *args;
{
  int argnum;
  Lisp_Object tem;
  char str[1];

  for (argnum = 0; argnum < nargs; argnum++)
    {
      tem = args[argnum];
    retry:
      if (XTYPE (tem) == Lisp_Int)
	{
	  str[0] = XINT (tem);
	  insert_before_markers (str, 1);
	}
      else if (XTYPE (tem) == Lisp_String)
	{
	  insert_before_markers (XSTRING (tem)->data, XSTRING (tem)->size);
	}
      else
	{
	  tem = wrong_type_argument (Qchar_or_string_p, tem);
	  goto retry;
	}
    }
  return Qnil;
}

/* Return a string with the contents of the current region */

DEFUN ("buffer-substring", Fbuffer_substring, Sbuffer_substring, 2, 2, 0,
  "Return the contents of part of the current buffer as a string.\n\
The two arguments specify the start and end, as character numbers.")
  (b, e)
     Lisp_Object b, e;
{
  int beg, end;

  validate_region (&b, &e);
  beg = XINT (b);
  end = XINT (e);

  if (beg <= bf_s1 && end > bf_s1)
      GapTo (beg);
  return make_string (&CharAt (beg), end - beg);
}

DEFUN ("buffer-string", Fbuffer_string, Sbuffer_string, 0, 0, 0,
  "Return the contents of the current buffer as a string.")
  ()
{
  if (FirstCharacter <= bf_s1 && NumCharacters + 1 > bf_s1)
      GapTo (FirstCharacter);
  return make_string (&CharAt (FirstCharacter), NumCharacters + 1 - FirstCharacter);
}

DEFUN ("insert-buffer-substring", Finsert_buffer_substring, Sinsert_buffer_substring,
  1, 3, 0,
  "Insert before point a substring of the contents buffer BUFFER.\n\
BUFFER may be a buffer or a buffer name.\n\
Arguments START and END are character numbers specifying the substring.\n\
They default to the beginning and the end of BUFFER.")
  (buf, b, e)
     Lisp_Object buf, b, e;
{
    int beg, end, exch;

  buf = Fget_buffer (buf);
  if (XBUFFER (buf) == bf_cur)
    error ("Cannot insert buffer into itself");

  if (NULL (b))
    beg = XBUFFER (buf)->text.head_clip - 1;
  else
    {
      CHECK_NUMBER_COERCE_MARKER (b, 0);
      beg = XINT (b) - 1;
    }
  if (NULL (e))
    end = XBUFFER (buf)->text.size1 + XBUFFER (buf)->text.size2
			- XBUFFER (buf)->text.tail_clip;
  else
    {
      CHECK_NUMBER_COERCE_MARKER (e, 1);
      end = XINT (e) - 1;
    }

  if (beg > end)
    exch = beg, beg = end, end = exch;

  if (!(XBUFFER (buf)->text.head_clip - 1 <= beg
	&& beg <= end
        && end <= XBUFFER (buf)->text.size1 + XBUFFER (buf)->text.size2
			- XBUFFER (buf)->text.tail_clip))
    args_out_of_range (b, e);

  if (beg < XBUFFER (buf)->text.size1)
    {
      InsCStr (XBUFFER (buf)->text.p1 + 1 + beg, min (end, XBUFFER (buf)->text.size1) - beg);
      beg = min (end, XBUFFER (buf)->text.size1);
    }
  if (beg < end)
    InsCStr (XBUFFER (buf)->text.p2 + 1 + beg, end - beg);

  return Qnil;
}

DEFUN ("subst-char-in-region", Fsubst_char_in_region,
  Ssubst_char_in_region, 4, 5, 0,
  "From START to END, replace FROMCHAR with TOCHAR each time it occurs.\n\
If optional arg NOUNDO is non-nil, don't record this change for undo\n\
and don't mark the buffer as really changed.")
  (start, end, fromchar, tochar, noundo)
     Lisp_Object start, end, fromchar, tochar, noundo;
{
  register int pos, stop, look;

  validate_region (&start, &end);
  CHECK_NUMBER (fromchar, 2);
  CHECK_NUMBER (tochar, 3);

  pos = XINT (start);
  stop = XINT (end);
  if (!NULL (bf_cur->read_only))
    Fbarf_if_buffer_read_only();

  look = XINT (fromchar);

  while (pos < stop)
    {
      if (CharAt (pos) == look)
	{
	  if (NULL (noundo))
	    RecordChange (pos, 1);
	  CharAt (pos) = XINT (tochar);
	}
      pos++;
    }
  modify_region (pos, stop);

  return Qnil;
}

DEFUN ("delete-region", Fdelete_region, Sdelete_region, 2, 2, "r",
  "Delete the text between point and mark.\n\
When called from a program, expects two arguments,\n\
character numbers specifying the stretch to be deleted.")
  (b, e)
     Lisp_Object b, e;
{
  validate_region (&b, &e);
  del_range (XINT (b), XINT (e));
  return Qnil;
}

DEFUN ("widen", Fwiden, Swiden, 0, 0, "",
  "Remove restrictions from current buffer, allowing full text to be seen and edited.")
  ()
{
  bf_cur->text.head_clip = bf_head_clip = 1;
  bf_cur->text.tail_clip = bf_tail_clip = 0;
  clip_changed = 1;
  return Qnil;
}

DEFUN ("narrow-to-region", Fnarrow_to_region, Snarrow_to_region, 2, 2, "r",
  "Restrict editing in current buffer to text between present values of point and mark.\n\
Use  widen  to undo the effects of this command.\n\
Called non-interactively, takes two arguments; character numbers which\n\
specify the stretch to which to restrict.")
  (b, e)
     Lisp_Object b, e;
{
  int i;

  CHECK_NUMBER_COERCE_MARKER (b, 0);
  CHECK_NUMBER_COERCE_MARKER (e, 1);

  if (XINT (b) > XINT (e))
    {
      i = XFASTINT (b);
      b = e;
      XFASTINT (e) = i;
    }

  if (!(1 <= XINT (b) && XINT (b) <= XINT (e)
        && XINT (e) <= bf_s1 + bf_s2 + 1))
    args_out_of_range (b, e);

  bf_cur->text.head_clip = bf_head_clip = XFASTINT (b);
  bf_cur->text.tail_clip = bf_tail_clip = bf_s1 + bf_s2 + 1 - XFASTINT (e);
  if (point < XFASTINT (b))
    SetPoint (XFASTINT (b));
  if (point > XFASTINT (e))
    SetPoint (XFASTINT (e));
  clip_changed = 1;
  return Qnil;
}

Lisp_Object
save_restriction_save ()
{
  Lisp_Object ml, mh;
  /* Note: I tried using markers here, but it does not win
     because insertion at the end of the saved region
     does not advance mh and is considered "outside" the saved region. */
  XFASTINT (ml) = bf_head_clip;
  XFASTINT (mh) = bf_tail_clip;

  return Fcons (Fcurrent_buffer (), Fcons (ml, mh));
}

Lisp_Object
save_restriction_restore (data)
     Lisp_Object data;
{
  register struct buffer *old = bf_cur;
  register int newhead, newtail;

  Fset_buffer (XCONS (data)->car);

  data = XCONS (data)->cdr;

  newhead = XINT (XCONS (data)->car);
  newtail = XINT (XCONS (data)->cdr);
  if (newhead + newtail > bf_s1 + bf_s2 + 1)
    {
      newhead = 1;
      newtail = 0;
    }
  bf_cur->text.head_clip = bf_head_clip = newhead;
  bf_cur->text.tail_clip = bf_tail_clip = newtail;
  clip_changed = 1;

  /* If point is outside the new visible range, move it inside. */
  if (point < FirstCharacter)
    SetPoint (FirstCharacter);
  if (point > NumCharacters+1)
    SetPoint (NumCharacters+1);

  SetBfp (old);
  return Qnil;
}

DEFUN ("save-restriction", Fsave_restriction, Ssave_restriction, 0, UNEVALLED, 0,
  "Execute the body, undoing at the end any changes to current buffer's restrictions.\n\
Changes to restrictions are made by narrow-to-region or by widen.\n\
Thus, the restrictions are the same after this function as they were before it.\n\
The value returned is that returned by the last form in the body.\n\
\n\
This function can be confused if, within the body, you widen\n\
and then make changes outside the area within the saved restrictions.\n\
\n\
Note: if you are using both save-excursion and save-restriction,\n\
use save-excursion outermost.")
  (body)
     Lisp_Object body;
{
  Lisp_Object val;
  int count = specpdl_ptr - specpdl;

  record_unwind_protect (save_restriction_restore, save_restriction_save ());
  val = Fprogn (body);
  unbind_to (count);
  return val;
}

DEFUN ("message", Fmessage, Smessage, 1, MANY, 0,
  "Print a one-line message at the bottom of the screen.\n\
The first argument is a control string.\n\
It may contain %s or %d or %c to print successive following arguments.\n\
%s means print an argument as a string, %d means print as number in decimal,\n\
%c means print a number as a single character.\n\
The argument used by %s must be a string or a symbol;\n\
the argument used by %d or %c must be a number.")
  (nargs, args)
     int nargs;
     Lisp_Object *args;
{
  Lisp_Object val;

  val = Fformat (nargs, args);
  message ("%s", XSTRING (val)->data);
  return val;
}

DEFUN ("format", Fformat, Sformat, 1, MANY, 0,
  "Format a string out of a control-string and arguments.\n\
The first argument is a control string.\n\
It, and subsequent arguments substituted into it, become the value, which is a string.\n\
It may contain %s or %d or %c to substitute successive following arguments.\n\
%s means print an argument as a string, %d means print as number in decimal,\n\
%c means print a number as a single character.\n\
The argument used by %s must be a string or a symbol;\n\
the argument used by %d, %b, %o, %x or %c must be a number.")
  (nargs, args)
     int nargs;
     register Lisp_Object *args;
{
  register int i;
  register int total = 5;
  char *buf;
  register unsigned char **strings = (unsigned char **) alloca (nargs * sizeof (char *));

  for (i = 0; i < nargs; i++)
    {
      if (XTYPE (args[i]) == Lisp_Symbol)
	{
	  strings[i] = XSYMBOL (args[i])->name->data;
	  total += XSYMBOL (args[i])->name->size;
	}
      else if (XTYPE (args[i]) == Lisp_String)
	{
	  strings[i] = XSTRING (args[i])->data;
	  total += XSTRING (args[i])->size;
	}
      else if (XTYPE (args[i]) == Lisp_Int)
	{
	  strings[i] = (unsigned char *) XINT (args[i]);
	  total += 10;
	}
      else
	{
	  strings[i] = (unsigned char *) "??";
	  total += 2;
	}
    }

  /* Format it in bigger and bigger buf's until it all fits. */

  while (1)
    {
      buf = (char *) alloca (total + 1);
      buf[total - 1] = 0;

      doprnt (buf, total + 1, strings[0], strings + 1);
      if (buf[total - 1] == 0)
	break;

      total *= 2;
    }

  return build_string (buf);
}

/* VARARGS 1 */
Lisp_Object
#ifdef NO_ARG_ARRAY
format1 (string1, arg0, arg1, arg2, arg3, arg4)
     Lisp_Object arg0, arg1, arg2, arg3, arg4;
#else
format1 (string1)
#endif
     char *string1;
{
  char buf[100];
#ifdef NO_ARG_ARRAY
  Lisp_Object args[5];
  args[0] = arg0;
  args[1] = arg1;
  args[2] = arg2;
  args[3] = arg3;
  args[4] = arg4;
  doprnt (buf, sizeof buf, string1, args);
#else
  doprnt (buf, sizeof buf, string1, &string1 + 1);
#endif
  return build_string (buf);
}

DEFUN ("char-equal", Fchar_equal, Schar_equal, 2, 2, 0,
  "T if args (both characters (numbers)) match.  May ignore case.\n\
Case is ignored if the current buffer specifies to do so.")
  (c1, c2)
     Lisp_Object c1, c2;
{
  extern char downcase_table[];  /* From search.c */

  CHECK_NUMBER (c1, 0);
  CHECK_NUMBER (c2, 1);

  if (!NULL (bf_cur->case_fold_search)
      ? downcase_table[XINT (c1)] == downcase_table[XINT (c2)]
      : XINT (c1) == XINT (c2))
    return Qt;
  return Qnil;
}

DEFUN ("getenv", Fgetenv, Sgetenv, 1, 1, "sEnvironment variable: ",
  "One arg VAR, a string. Return the value of environment variable VAR, as a string.")
  (str)
     Lisp_Object str;
{
  char *val;
  CHECK_STRING (str, 0);
  val = (char *) getenv (XSTRING (str)->data);
  if (!val)
    return Qnil;
  return build_string (val);
}

void
syms_of_editfns ()
{
  defsubr (&Schar_equal);
  defsubr (&Sgoto_char);
  defsubr (&Sstring_to_char);
  defsubr (&Schar_to_string);
  defsubr (&Sbuffer_substring);
  defsubr (&Sbuffer_string);

  defsubr (&Spoint_marker);
  defalias (&Spoint_marker, "dot-marker");
  defsubr (&Smark_marker);
  defsubr (&Spoint);
  defalias (&Spoint, "dot");
  defsubr (&Sregion_beginning);
  defsubr (&Sregion_end);
  defsubr (&Smark);
  defsubr (&Sset_mark);
  defsubr (&Ssave_excursion);

  defsubr (&Sbufsize);
  defsubr (&Spoint_max);
  defsubr (&Spoint_min);
  defalias (&Spoint_max, "dot-max");
  defalias (&Spoint_min, "dot-min");
  defsubr (&Spoint_min_marker);
  defsubr (&Spoint_max_marker);

  defsubr (&Sbobp);
  defsubr (&Seobp);
  defsubr (&Sbolp);
  defsubr (&Seolp);
  defsubr (&Sfollchar);
  defsubr (&Sprevchar);
  defsubr (&Schar_after);
  defsubr (&Sinsert);
  defsubr (&Sinsert_before_markers);

  defsubr (&Suser_login_name);
  defsubr (&Suser_real_login_name);
  defsubr (&Suser_full_name);
  defsubr (&Scurrent_time_string);
  defsubr (&Sgetenv);
  defsubr (&Ssystem_name);
  defsubr (&Smessage);
  defsubr (&Sformat);

  defsubr (&Sinsert_buffer_substring);
  defsubr (&Ssubst_char_in_region);
  defsubr (&Sdelete_region);
  defsubr (&Swiden);
  defsubr (&Snarrow_to_region);
  defsubr (&Ssave_restriction);
}