editfns.c

/* Lisp functions pertaining to editing.
   Copyright (C) 1985,86,87,89,93,94,95,96,97,98 Free Software Foundation, Inc.

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
the Free Software Foundation; either version 2, or (at your option)
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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#include <sys/types.h>

#include <config.h>

#ifdef VMS
#include "vms-pwd.h"
#else
#include <pwd.h>
#endif

#ifdef STDC_HEADERS
#include <stdlib.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "lisp.h"
#include "intervals.h"
#include "buffer.h"
#include "charset.h"
#include "window.h"

#include "systime.h"

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

#ifndef NULL
#define NULL 0
#endif

extern char **environ;
extern Lisp_Object make_time ();
extern void insert_from_buffer ();
static int tm_diff ();
static void update_buffer_properties ();
size_t emacs_strftime ();
void set_time_zone_rule ();

Lisp_Object Vbuffer_access_fontify_functions;
Lisp_Object Qbuffer_access_fontify_functions;
Lisp_Object Vbuffer_access_fontified_property;

Lisp_Object Fuser_full_name ();

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

Lisp_Object Vsystem_name;
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 */

void
init_editfns ()
{
  char *user_name;
  register unsigned char *p, *q, *r;
  struct passwd *pw;	/* password entry for the current user */
  Lisp_Object tem;

  /* Set up system_name even when dumping.  */
  init_system_name ();

#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 ());
#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.)  */
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "root");
#else
  Vuser_real_login_name = build_string (pw ? pw->pw_name : "unknown");
#endif

  /* Get the effective user name, by consulting environment variables,
     or the effective uid if those are unset.  */
  user_name = (char *) getenv ("LOGNAME");
  if (!user_name)
#ifdef WINDOWSNT
    user_name = (char *) getenv ("USERNAME");	/* it's USERNAME on NT */
#else  /* WINDOWSNT */
    user_name = (char *) getenv ("USER");
#endif /* WINDOWSNT */
  if (!user_name)
    {
      pw = (struct passwd *) getpwuid (geteuid ());
      user_name = (char *) (pw ? pw->pw_name : "unknown");
    }
  Vuser_login_name = build_string (user_name);

  /* If the user name claimed in the environment vars differs from
     the real uid, use the claimed name to find the full name.  */
  tem = Fstring_equal (Vuser_login_name, Vuser_real_login_name);
  Vuser_full_name = Fuser_full_name (NILP (tem)? make_number (geteuid())
				     : Vuser_login_name);
  
  p = (unsigned char *) getenv ("NAME");
  if (p)
    Vuser_full_name = build_string (p);
  else if (NILP (Vuser_full_name))
    Vuser_full_name = build_string ("unknown");
}

DEFUN ("char-to-string", Fchar_to_string, Schar_to_string, 1, 1, 0,
  "Convert arg CHAR to a string containing that character.")
  (character)
     Lisp_Object character;
{
  int len;
  unsigned char workbuf[4], *str;

  CHECK_NUMBER (character, 0);

  len = CHAR_STRING (XFASTINT (character), workbuf, str);
  return make_string_from_bytes (str, 1, len);
}

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.\n\
A multibyte character is handled correctly.")
  (string)
     register Lisp_Object string;
{
  register Lisp_Object val;
  register struct Lisp_String *p;
  CHECK_STRING (string, 0);
  p = XSTRING (string);
  if (p->size)
    {
      if (STRING_MULTIBYTE (string))
	XSETFASTINT (val, STRING_CHAR (p->data, STRING_BYTES (p)));
      else
	XSETFASTINT (val, p->data[0]);
    }
  else
    XSETFASTINT (val, 0);
  return val;
}

static Lisp_Object
buildmark (charpos, bytepos)
     int charpos, bytepos;
{
  register Lisp_Object mark;
  mark = Fmake_marker ();
  set_marker_both (mark, Qnil, charpos, bytepos);
  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;
  XSETFASTINT (temp, PT);
  return temp;
}

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

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\
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.")
  (position)
     register Lisp_Object position;
{
  int pos;
  unsigned char *p;

  if (MARKERP (position)
      && current_buffer == XMARKER (position)->buffer)
    {
      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;
    }

  CHECK_NUMBER_COERCE_MARKER (position, 0);

  pos = clip_to_bounds (BEGV, XINT (position), ZV);
  SET_PT (pos);
  return position;
}

static Lisp_Object
region_limit (beginningp)
     int beginningp;
{
  extern Lisp_Object Vmark_even_if_inactive; /* Defined in callint.c. */
  register Lisp_Object m;
  if (!NILP (Vtransient_mark_mode) && NILP (Vmark_even_if_inactive)
      && NILP (current_buffer->mark_active))
    Fsignal (Qmark_inactive, Qnil);
  m = Fmarker_position (current_buffer->mark);
  if (NILP (m)) error ("There is no region now");
  if ((PT < XFASTINT (m)) == beginningp)
    return (make_number (PT));
  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;
}

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\
This function does not move point.\n\n\
In the minibuffer, if point is not within the prompt,\n\
the return value is never within the prompt either.")

  (n)
     Lisp_Object n;
{
  register int orig, orig_byte, end;

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

  orig = PT;
  orig_byte = PT_BYTE;
  Fforward_line (make_number (XINT (n) - 1));
  end = PT;

  if (INTEGERP (current_buffer->prompt_end_charpos)
      && orig >= XFASTINT (current_buffer->prompt_end_charpos)
      && end < XFASTINT (current_buffer->prompt_end_charpos))
    end = XFASTINT (current_buffer->prompt_end_charpos);

  SET_PT_BOTH (orig, orig_byte);

  return make_number (end);
}

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

  return make_number (find_before_next_newline 
		      (PT, 0, XINT (n) - (XINT (n) <= 0)));
}

Lisp_Object
save_excursion_save ()
{
  register int visible = (XBUFFER (XWINDOW (selected_window)->buffer)
			  == current_buffer);

  return Fcons (Fpoint_marker (),
		Fcons (Fcopy_marker (current_buffer->mark, Qnil),
		       Fcons (visible ? Qt : Qnil,
			      current_buffer->mark_active)));		       
}

Lisp_Object
save_excursion_restore (info)
     Lisp_Object info;
{
  Lisp_Object tem, tem1, omark, nmark;
  struct gcpro gcpro1, gcpro2, gcpro3;

  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 (NILP (tem))
    return Qnil;

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

  Fset_buffer (tem);
  tem = Fcar (info);
  Fgoto_char (tem);
  unchain_marker (tem);
  tem = Fcar (Fcdr (info));
  omark = Fmarker_position (current_buffer->mark);
  Fset_marker (current_buffer->mark, tem, Fcurrent_buffer ());
  nmark = Fmarker_position (tem);
  unchain_marker (tem);
  tem = Fcdr (Fcdr (info));
#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.  */
  tem1 = Fcar (tem);
  if (!NILP (tem1)
      && current_buffer != XBUFFER (XWINDOW (selected_window)->buffer))
    Fswitch_to_buffer (Fcurrent_buffer (), Qnil);
#endif /* 0 */

  tem1 = current_buffer->mark_active;
  current_buffer->mark_active = Fcdr (tem);
  if (!NILP (Vrun_hooks))
    {
      /* If mark is active now, and either was not active
	 or was at a different place, run the activate hook.  */
      if (! NILP (current_buffer->mark_active))
	{
	  if (! EQ (omark, nmark))
	    call1 (Vrun_hooks, intern ("activate-mark-hook"));
	}
      /* If mark has ceased to be active, run deactivate hook.  */
      else if (! NILP (tem1))
	call1 (Vrun_hooks, intern ("deactivate-mark-hook"));
    }
  UNGCPRO;
  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\
even in case of abnormal exit (throw or error).\n\
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'.")
  (args)
     Lisp_Object args;
{
  register Lisp_Object val;
  int count = specpdl_ptr - specpdl;

  record_unwind_protect (save_excursion_restore, save_excursion_save ());

  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;

  record_unwind_protect (set_buffer_if_live, Fcurrent_buffer ());

  val = Fprogn (args);
  return unbind_to (count, val);
}

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;
{
  if (NILP (buffer))
    return make_number (Z - BEG);
  else
    {
      CHECK_BUFFER (buffer, 1);
      return make_number (BUF_Z (XBUFFER (buffer))
			  - BUF_BEG (XBUFFER (buffer)));
    }
}

DEFUN ("point-min", Fpoint_min, Spoint_min, 0, 0, 0,
  "Return the minimum permissible value of point in the current buffer.\n\
This is 1, unless narrowing (a buffer restriction) is in effect.")
  ()
{
  Lisp_Object temp;
  XSETFASTINT (temp, BEGV);
  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\
This is the beginning, unless narrowing (a buffer restriction) is in effect.")
  ()
{
  return buildmark (BEGV, BEGV_BYTE);
}

DEFUN ("point-max", Fpoint_max, Spoint_max, 0, 0, 0,
  "Return the maximum permissible value of point in the current buffer.\n\
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)\n\
is in effect, in which case it is less.")
  ()
{
  Lisp_Object temp;
  XSETFASTINT (temp, ZV);
  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\
This is (1+ (buffer-size)), unless narrowing (a buffer restriction)\n\
is in effect, in which case it is less.")
  ()
{
  return buildmark (ZV, ZV_BYTE);
}

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;
}

DEFUN ("position-bytes", Fposition_bytes, Sposition_bytes, 1, 1, 0,
  "Return the byte position for character position POSITION.\n\
If POSITION is out of range, the value is nil.")
  (position)
     Lisp_Object position;
{
  CHECK_NUMBER_COERCE_MARKER (position, 1);
  if (XINT (position) < BEG || XINT (position) > Z)
    return Qnil;
  return make_number (CHAR_TO_BYTE (XINT (position)));
}

DEFUN ("byte-to-position", Fbyte_to_position, Sbyte_to_position, 1, 1, 0,
  "Return the character position for byte position BYTEPOS.\n\
If BYTEPOS is out of range, the value is nil.")
  (bytepos)
     Lisp_Object bytepos;
{
  CHECK_NUMBER (bytepos, 1);
  if (XINT (bytepos) < BEG_BYTE || XINT (bytepos) > Z_BYTE)
    return Qnil;
  return make_number (BYTE_TO_CHAR (XINT (bytepos)));
}

DEFUN ("following-char", Ffollowing_char, Sfollowing_char, 0, 0, 0,
  "Return the character following point, as a number.\n\
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.")
  ()
{
  Lisp_Object temp;
  if (PT >= ZV)
    XSETFASTINT (temp, 0);
  else
    XSETFASTINT (temp, FETCH_CHAR (PT_BYTE));
  return temp;
}

DEFUN ("preceding-char", Fprevious_char, Sprevious_char, 0, 0, 0,
  "Return the character preceding point, as a number.\n\
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.")
  ()
{
  Lisp_Object temp;
  if (PT <= BEGV)
    XSETFASTINT (temp, 0);
  else if (!NILP (current_buffer->enable_multibyte_characters))
    {
      int pos = PT_BYTE;
      DEC_POS (pos);
      XSETFASTINT (temp, FETCH_CHAR (pos));
    }
  else
    XSETFASTINT (temp, FETCH_BYTE (PT_BYTE - 1));
  return temp;
}

DEFUN ("bobp", Fbobp, Sbobp, 0, 0, 0,
  "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.")
  ()
{
  if (PT == BEGV)
    return Qt;
  return Qnil;
}

DEFUN ("eobp", Feobp, Seobp, 0, 0, 0,
  "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.")
  ()
{
  if (PT == ZV)
    return Qt;
  return Qnil;
}

DEFUN ("bolp", Fbolp, Sbolp, 0, 0, 0,
  "Return t if point is at the beginning of a line.")
  ()
{
  if (PT == BEGV || FETCH_BYTE (PT_BYTE - 1) == '\n')
    return Qt;
  return Qnil;
}

DEFUN ("eolp", Feolp, Seolp, 0, 0, 0,
  "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.")
  ()
{
  if (PT == ZV || FETCH_BYTE (PT_BYTE) == '\n')
    return Qt;
  return Qnil;
}

DEFUN ("char-after", Fchar_after, Schar_after, 0, 1, 0,
  "Return character in current buffer at position POS.\n\
POS is an integer or a buffer pointer.\n\
If POS is out of range, the value is nil.")
  (pos)
     Lisp_Object pos;
{
  register int pos_byte;
  register Lisp_Object val;

  if (NILP (pos))
    {
      pos_byte = PT_BYTE;
      XSETFASTINT (pos, PT);
    }

  if (MARKERP (pos))
    {
      pos_byte = marker_byte_position (pos);
      if (pos_byte < BEGV_BYTE || pos_byte >= ZV_BYTE)
	return Qnil;
    }
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      if (XINT (pos) < BEGV || XINT (pos) >= ZV)
	return Qnil;
      
      pos_byte = CHAR_TO_BYTE (XINT (pos));
    }

  return make_number (FETCH_CHAR (pos_byte));
}

DEFUN ("char-before", Fchar_before, Schar_before, 0, 1, 0,
  "Return character in current buffer preceding position POS.\n\
POS is an integer or a buffer pointer.\n\
If POS is out of range, the value is nil.")
  (pos)
     Lisp_Object pos;
{
  register Lisp_Object val;
  register int pos_byte;

  if (NILP (pos))
    {
      pos_byte = PT_BYTE;
      XSETFASTINT (pos, PT);
    }

  if (MARKERP (pos))
    {
      pos_byte = marker_byte_position (pos);

      if (pos_byte <= BEGV_BYTE || pos_byte > ZV_BYTE)
	return Qnil;
    }
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);

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

      pos_byte = CHAR_TO_BYTE (XINT (pos));
    }

  if (!NILP (current_buffer->enable_multibyte_characters))
    {
      DEC_POS (pos_byte);
      XSETFASTINT (val, FETCH_CHAR (pos_byte));
    }
  else
    {
      pos_byte--;
      XSETFASTINT (val, FETCH_BYTE (pos_byte));
    }
   return val;
}

DEFUN ("user-login-name", Fuser_login_name, Suser_login_name, 0, 1, 0,
  "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\
Also, if the environment variable LOGNAME or USER is set,\n\
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;
{
  struct passwd *pw;

  /* 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.  */
  if (INTEGERP (Vuser_login_name))
    init_editfns ();

  if (NILP (uid))
    return Vuser_login_name;

  CHECK_NUMBER (uid, 0);
  pw = (struct passwd *) getpwuid (XINT (uid));
  return (pw ? build_string (pw->pw_name) : Qnil);
}

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\
This ignores the environment variables LOGNAME and USER, so it differs from\n\
`user-login-name' when running under `su'.")
  ()
{
  /* 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.  */
  if (INTEGERP (Vuser_login_name))
    init_editfns ();
  return Vuser_real_login_name;
}

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 ());
}

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\
If the full name corresponding to Emacs's userid is not known,\n\
return \"unknown\".\n\
\n\
If optional argument UID is an integer, return the full name of the user\n\
with that uid, or nil if there is no such user.\n\
If UID is a string, return the full name of the user with that login\n\
name, or nil if there is no such user.")
  (uid)
     Lisp_Object uid;
{
  struct passwd *pw;
  register unsigned char *p, *q;
  extern char *index ();
  Lisp_Object full;

  if (NILP (uid))
    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");

  if (!pw)
    return Qnil;
  
  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)
    {
      register unsigned char *r;
      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;
}

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;
}

/* For the benefit of callers who don't want to include lisp.h */
char *
get_system_name ()
{
  if (STRINGP (Vsystem_name))
    return (char *) XSTRING (Vsystem_name)->data;
  else
    return "";
}

DEFUN ("emacs-pid", Femacs_pid, Semacs_pid, 0, 0, 0,
  "Return the process ID of Emacs, as an integer.")
  ()
{
  return make_number (getpid ());
}

DEFUN ("current-time", Fcurrent_time, Scurrent_time, 0, 0, 0,
  "Return the current time, as the number of seconds since 1970-01-01 00:00:00.\n\
The time is returned as a list of three integers.  The first has the\n\
most significant 16 bits of the seconds, while the second has the\n\
least significant 16 bits.  The third integer gives the microsecond\n\
count.\n\
\n\
The microsecond count is zero on systems that do not provide\n\
resolution finer than a second.")
  ()
{
  EMACS_TIME t;
  Lisp_Object result[3];

  EMACS_GET_TIME (t);
  XSETINT (result[0], (EMACS_SECS (t) >> 16) & 0xffff);
  XSETINT (result[1], (EMACS_SECS (t) >> 0)  & 0xffff);
  XSETINT (result[2], EMACS_USECS (t));

  return Flist (3, result);
}


static int
lisp_time_argument (specified_time, result)
     Lisp_Object specified_time;
     time_t *result;
{
  if (NILP (specified_time))
    return time (result) != -1;
  else
    {
      Lisp_Object high, low;
      high = Fcar (specified_time);
      CHECK_NUMBER (high, 0);
      low = Fcdr (specified_time);
      if (CONSP (low))
	low = Fcar (low);
      CHECK_NUMBER (low, 0);
      *result = (XINT (high) << 16) + (XINT (low) & 0xffff);
      return *result >> 16 == XINT (high);
    }
}

/* Write information into buffer S of size MAXSIZE, according to the
   FORMAT of length FORMAT_LEN, using time information taken from *TP.
   Return the number of bytes written, not including the terminating
   '\0'.  If S is NULL, nothing will be written anywhere; so to
   determine how many bytes would be written, use NULL for S and
   ((size_t) -1) for MAXSIZE.

   This function behaves like emacs_strftime, except it allows null
   bytes in FORMAT.  */
static size_t
emacs_memftime (s, maxsize, format, format_len, tp)
      char *s;
      size_t maxsize;
      const char *format;
      size_t format_len;
      const struct tm *tp;
{
  size_t total = 0;

  /* Loop through all the null-terminated strings in the format
     argument.  Normally there's just one null-terminated string, but
     there can be arbitrarily many, concatenated together, if the
     format contains '\0' bytes.  emacs_strftime stops at the first
     '\0' byte so we must invoke it separately for each such string.  */
  for (;;)
    {
      size_t len;
      size_t result;

      if (s)
	s[0] = '\1';

      result = emacs_strftime (s, maxsize, format, tp);

      if (s)
	{
	  if (result == 0 && s[0] != '\0')
	    return 0;
	  s += result + 1;
	}

      maxsize -= result + 1;
      total += result;
      len = strlen (format);
      if (len == format_len)
	return total;
      total++;
      format += len + 1;
      format_len -= len + 1;
    }
}

/*
DEFUN ("format-time-string", Fformat_time_string, Sformat_time_string, 1, 3, 0,
  "Use FORMAT-STRING to format the time TIME, or now if omitted.\n\
TIME is specified as (HIGH LOW . IGNORED) or (HIGH . LOW), as returned by\n\
`current-time' or `file-attributes'.\n\
The third, optional, argument UNIVERSAL, if non-nil, means describe TIME\n\
as Universal Time; nil means describe TIME in the local time zone.\n\
The value is a copy of FORMAT-STRING, but with certain constructs replaced\n\
by text that describes the specified date and time in TIME:\n\
\n\
%Y is the year, %y within the century, %C the century.\n\
%G is the year corresponding to the ISO week, %g within the century.\n\
%m is the numeric month.\n\
%b and %h are the locale's abbreviated month name, %B the full name.\n\
%d is the day of the month, zero-padded, %e is blank-padded.\n\
%u is the numeric day of week from 1 (Monday) to 7, %w from 0 (Sunday) to 6.\n\
%a is the locale's abbreviated name of the day of week, %A the full name.\n\
%U is the week number starting on Sunday, %W starting on Monday,\n\
 %V according to ISO 8601.\n\
%j is the day of the year.\n\
\n\
%H is the hour on a 24-hour clock, %I is on a 12-hour clock, %k is like %H\n\
 only blank-padded, %l is like %I blank-padded.\n\
%p is the locale's equivalent of either AM or PM.\n\
%M is the minute.\n\
%S is the second.\n\
%Z is the time zone name, %z is the numeric form.\n\
%s is the number of seconds since 1970-01-01 00:00:00 +0000.\n\
\n\
%c is the locale's date and time format.\n\
%x is the locale's \"preferred\" date format.\n\
%D is like \"%m/%d/%y\".\n\
\n\
%R is like \"%H:%M\", %T is like \"%H:%M:%S\", %r is like \"%I:%M:%S %p\".\n\
%X is the locale's \"preferred\" time format.\n\
\n\
Finally, %n is a newline, %t is a tab, %% is a literal %.\n\
\n\
Certain flags and modifiers are available with some format controls.\n\
The flags are `_' and `-'.  For certain characters X, %_X is like %X,\n\
but padded with blanks; %-X is like %X, but without padding.\n\
%NX (where N stands for an integer) is like %X,\n\
but takes up at least N (a number) positions.\n\
The modifiers are `E' and `O'.  For certain characters X,\n\
%EX is a locale's alternative version of %X;\n\
%OX is like %X, but uses the locale's number symbols.\n\
\n\
For example, to produce full ISO 8601 format, use \"%Y-%m-%dT%T%z\".")
  (format_string, time, universal)
*/

DEFUN ("format-time-string", Fformat_time_string, Sformat_time_string, 1, 3, 0,
  0 /* See immediately above */)
  (format_string, time, universal)
     Lisp_Object format_string, time, universal;
{
  time_t value;
  int size;
  struct tm *tm;

  CHECK_STRING (format_string, 1);

  if (! lisp_time_argument (time, &value))
    error ("Invalid time specification");

  /* This is probably enough.  */
  size = STRING_BYTES (XSTRING (format_string)) * 6 + 50;

  tm = NILP (universal) ? localtime (&value) : gmtime (&value);
  if (! tm)
    error ("Specified time is not representable");

  while (1)
    {
      char *buf = (char *) alloca (size + 1);
      int result;

      buf[0] = '\1';
      result = emacs_memftime (buf, size, XSTRING (format_string)->data,
			       STRING_BYTES (XSTRING (format_string)),
			       tm);
      if ((result > 0 && result < size) || (result == 0 && buf[0] == '\0'))
	return make_string (buf, result);

      /* If buffer was too small, make it bigger and try again.  */
      result = emacs_memftime (NULL, (size_t) -1,
			       XSTRING (format_string)->data,
			       STRING_BYTES (XSTRING (format_string)),