data.c

早期freebsd实现

DEFUN ("symbol-value", Fsymbol_value, Ssymbol_value, 1, 1, 0, "Return SYMBOL's value.")
  (sym)
     Lisp_Object sym;
{
  register Lisp_Object valcontents, tem1;
  register Lisp_Object val;
  CHECK_SYMBOL (sym, 0);
  valcontents = XSYMBOL (sym)->value;

 retry:
#ifdef SWITCH_ENUM_BUG
  switch ((int) XTYPE (valcontents))
#else
  switch (XTYPE (valcontents))
#endif
    {
    case Lisp_Buffer_Local_Value:
    case Lisp_Some_Buffer_Local_Value:
      /* valcontents is a list
        (REALVALUE BUFFER CURRENT-ALIST-ELEMENT . DEFAULT-VALUE)).

        CURRENT-ALIST-ELEMENT is a pointer to an element of BUFFER's
	local_var_alist, that being the element whose car is this variable.
        Or it can be a pointer to the (CURRENT-ALIST-ELEMENT . DEFAULT-VALUE), if BUFFER
	does not have an element in its alist for this variable.

	If the current buffer is not BUFFER, we store the current REALVALUE value into
	CURRENT-ALIST-ELEMENT, then find the appropriate alist element for
	the buffer now current and set up CURRENT-ALIST-ELEMENT.
	Then we set REALVALUE out of that element, and store into BUFFER.
 	Note that REALVALUE can be a forwarding pointer. */

      tem1 = XCONS (XCONS (valcontents)->cdr)->car;
      if (NULL (tem1) || current_buffer != XBUFFER (tem1))
	{
	  tem1 = XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->car;
          Fsetcdr (tem1, do_symval_forwarding (XCONS (valcontents)->car));
	  tem1 = assq_no_quit (sym, current_buffer->local_var_alist);
	  if (NULL (tem1))
	    tem1 = XCONS (XCONS (valcontents)->cdr)->cdr;
	  XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->car = tem1;
	  XSET (XCONS (XCONS (valcontents)->cdr)->car, Lisp_Buffer, current_buffer);
	  store_symval_forwarding (sym, XCONS (valcontents)->car, Fcdr (tem1));
	}
      valcontents = XCONS (valcontents)->car;
      goto retry;

    case Lisp_Intfwd:
      XSET (val, Lisp_Int, *XINTPTR (valcontents));
      return val;

    case Lisp_Boolfwd:
      if (*XINTPTR (valcontents))
	return Qt;
      return Qnil;

    case Lisp_Objfwd:
      return *XOBJFWD (valcontents);

    case Lisp_Buffer_Objfwd:
      return *(Lisp_Object *)(XUINT (valcontents) + (char *)current_buffer);

    case Lisp_Symbol:
      /* For a symbol, check whether it is 'unbound. */
      if (!EQ (valcontents, Qunbound))
	break;
      /* drops through! */
    case Lisp_Void:
      return Fsignal (Qvoid_variable, Fcons (sym, Qnil));
    }
  return valcontents;
}

DEFUN ("default-value", Fdefault_value, Sdefault_value, 1, 1, 0,
  "Return SYMBOL's default value.\n\
This is the value that is seen in buffers that do not have their own values\n\
for this variable.")
  (sym)
     Lisp_Object sym;
{
  register Lisp_Object valcontents;

  CHECK_SYMBOL (sym, 0);
  valcontents = XSYMBOL (sym)->value;
  if (XTYPE (valcontents) == Lisp_Buffer_Objfwd)
    {
      register int idx = XUINT (valcontents);

      if (*(int *) (idx + (char *) &buffer_local_flags) != 0)
	return *(Lisp_Object *)(idx + (char *) &buffer_defaults);
    }

  if (XTYPE (valcontents) == Lisp_Buffer_Local_Value ||
      XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
    return XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->cdr;
  return Fsymbol_value (sym);
}

DEFUN ("set", Fset, Sset, 2, 2, 0,
  "Set SYMBOL's value to NEWVAL, and return NEWVAL.")
  (sym, newval)
     register Lisp_Object sym, newval;
{
#ifndef RTPC_REGISTER_BUG
  register Lisp_Object valcontents, tem1, current_alist_element;
#else /* RTPC_REGISTER_BUG */
  register Lisp_Object tem1;
  Lisp_Object valcontents, current_alist_element;
#endif /* RTPC_REGISTER_BUG */

  CHECK_SYMBOL (sym, 0);
  if (NULL (sym) || EQ (sym, Qt))
    return Fsignal (Qsetting_constant, Fcons (sym, Qnil));
  valcontents = XSYMBOL (sym)->value;

  if (XTYPE (valcontents) == Lisp_Buffer_Objfwd)
    {
      register int idx = XUINT (valcontents);
      register int mask = *(int *)(idx + (char *) &buffer_local_flags);
      if (mask > 0)
	current_buffer->local_var_flags |= mask;
    }

  if (XTYPE (valcontents) == Lisp_Buffer_Local_Value ||
      XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
    {
      /* valcontents is a list
        (REALVALUE BUFFER CURRENT-ALIST-ELEMENT . DEFAULT-VALUE)).

        CURRENT-ALIST-ELEMENT is a pointer to an element of BUFFER's
	local_var_alist, that being the element whose car is this variable.
        Or it can be a pointer to the (CURRENT-ALIST-ELEMENT . DEFAULT-VALUE), if BUFFER
	does not have an element in its alist for this variable.

	If the current buffer is not BUFFER, we store the current REALVALUE value into
	CURRENT-ALIST-ELEMENT, then find the appropriate alist element for
	the buffer now current and set up CURRENT-ALIST-ELEMENT.
	Then we set REALVALUE out of that element, and store into BUFFER.
	Note that REALVALUE can be a forwarding pointer. */

      current_alist_element = XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->car;
      if (current_buffer != ((XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
		     ? XBUFFER (XCONS (XCONS (valcontents)->cdr)->car)
		     : XBUFFER (XCONS (current_alist_element)->car)))
	{
          Fsetcdr (current_alist_element, do_symval_forwarding (XCONS (valcontents)->car));

	  tem1 = Fassq (sym, current_buffer->local_var_alist);
	  if (NULL (tem1))
	    /* This buffer sees the default value still.
	       If type is Lisp_Some_Buffer_Local_Value, set the default value.
	       If type is Lisp_Buffer_Local_Value, give this buffer a local value
		and set that.  */
	    if (XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
	      tem1 = XCONS (XCONS (valcontents)->cdr)->cdr;
	    else
	      {
		tem1 = Fcons (sym, Fcdr (current_alist_element));
		current_buffer->local_var_alist = Fcons (tem1, current_buffer->local_var_alist);
	      }
	  XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->car = tem1;
	  XSET (XCONS (XCONS (valcontents)->cdr)->car, Lisp_Buffer, current_buffer);
	}
      valcontents = XCONS (valcontents)->car;
    }
  store_symval_forwarding (sym, valcontents, newval);
  return newval;
}

DEFUN ("set-default", Fset_default, Sset_default, 2, 2, 0,
  "Set SYMBOL's default value to VAL.  SYMBOL and VAL are evaluated.\n\
The default value is seen in buffers that do not have their own values\n\
for this variable.")
  (sym, value)
     Lisp_Object sym, value;
{
  register Lisp_Object valcontents, current_alist_element, alist_element_buffer;

  CHECK_SYMBOL (sym, 0);
  valcontents = XSYMBOL (sym)->value;

  /* Handle variables like case-fold-search that have special slots
     in the buffer.  Make them work apparently like Lisp_Buffer_Local_Value
     variables.  */
  if (XTYPE (valcontents) == Lisp_Buffer_Objfwd)
    {
      register int idx = XUINT (valcontents);
#ifndef RTPC_REGISTER_BUG
      register struct buffer *b;
#else
      struct buffer *b;
#endif
      register int mask = *(int *) (idx + (char *) &buffer_local_flags);

      if (mask > 0)
	{
	  *(Lisp_Object *)(idx + (char *) &buffer_defaults) = value;
	  for (b = all_buffers; b; b = b->next)
	    if (!(b->local_var_flags & mask))
	      *(Lisp_Object *)(idx + (char *) b) = value;
	}
      return value;
    }

  if (XTYPE (valcontents) != Lisp_Buffer_Local_Value &&
      XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value)
    return Fset (sym, value);

  /* Store new value into the DEFAULT-VALUE slot */
  XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->cdr = value;

  /* If that slot is current, we must set the REALVALUE slot too */
  current_alist_element = XCONS (XCONS (XCONS (valcontents)->cdr)->cdr)->car;
  alist_element_buffer = Fcar (current_alist_element);
  if (EQ (alist_element_buffer, current_alist_element))
    store_symval_forwarding (sym, XCONS (valcontents)->car, value);

  return value;
}

DEFUN ("setq-default", Fsetq_default, Ssetq_default, 2, UNEVALLED, 0,
  "Set SYMBOL's default value to VAL.  VAL is evaluated; SYMBOL is not.\n\
The default value is seen in buffers that do not have their own values\n\
for this variable.")
  (args)
     Lisp_Object args;
{
  register Lisp_Object val;
  struct gcpro gcpro1;

  GCPRO1 (args);
  val = Feval (Fcar (Fcdr (args)));
  UNGCPRO;
  return Fset_default (Fcar (args), val);
}

DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, Smake_variable_buffer_local,
  1, 1, "vMake Variable Buffer Local: ",
  "Make VARIABLE have a separate value for each buffer.\n\
At any time, the value for the current buffer is in effect.\n\
There is also a default value which is seen in any buffer which has not yet\n\
set its own value.\n\
The function `default-value' gets the default value and `set-default' sets it.\n\
Using `set' or `setq' to set the variable causes it to have a separate value\n\
for the current buffer if it was previously using the default value.")
  (sym)
     register Lisp_Object sym;
{
  register Lisp_Object tem, valcontents;

  CHECK_SYMBOL (sym, 0);

  if (EQ (sym, Qnil) || EQ (sym, Qt))
    error ("Symbol %s may not be buffer-local", XSYMBOL (sym)->name->data);

  valcontents = XSYMBOL (sym)->value;
  if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value) ||
      (XTYPE (valcontents) == Lisp_Buffer_Objfwd))
    return sym;
  if (XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
    {
      XSETTYPE (XSYMBOL (sym)->value, Lisp_Buffer_Local_Value);
      return sym;
    }
  if (EQ (valcontents, Qunbound))
    XSYMBOL (sym)->value = Qnil;
  tem = Fcons (Qnil, Fsymbol_value (sym));
  XCONS (tem)->car = tem;
  XSYMBOL (sym)->value = Fcons (XSYMBOL (sym)->value, Fcons (Fcurrent_buffer (), tem));
  XSETTYPE (XSYMBOL (sym)->value, Lisp_Buffer_Local_Value);
  return sym;
}

DEFUN ("make-local-variable", Fmake_local_variable, Smake_local_variable,
  1, 1, "vMake Local Variable: ",
  "Make VARIABLE have a separate value in the current buffer.\n\
Other buffers will continue to share a common default value.\n\
See also `make-variable-buffer-local'.")
  (sym)
     register Lisp_Object sym;
{
  register Lisp_Object tem, valcontents;

  CHECK_SYMBOL (sym, 0);

  if (EQ (sym, Qnil) || EQ (sym, Qt))
    error ("Symbol %s may not be buffer-local", XSYMBOL (sym)->name->data);

  valcontents = XSYMBOL (sym)->value;
  if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value) ||
      (XTYPE (valcontents) == Lisp_Buffer_Objfwd))
    return sym;
  /* Make sure sym is set up to hold per-buffer values */
  if (XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value)
    {
      if (EQ (valcontents, Qunbound))
	XSYMBOL (sym)->value = Qnil;
      tem = Fcons (Qnil, Fsymbol_value (sym));
      XCONS (tem)->car = tem;
      XSYMBOL (sym)->value = Fcons (XSYMBOL (sym)->value, Fcons (Qnil, tem));
      XSETTYPE (XSYMBOL (sym)->value, Lisp_Some_Buffer_Local_Value);
    }
  /* Make sure this buffer has its own value of sym */
  tem = Fassq (sym, current_buffer->local_var_alist);
  if (NULL (tem))
    {
      current_buffer->local_var_alist
        = Fcons (Fcons (sym, XCONS (XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->cdr)->cdr),
		 current_buffer->local_var_alist);

      /* Make sure symbol does not think it is set up for this buffer;
	 force it to look once again for this buffer's value */
      {
	/* This local variable avoids "expression to complex" on IBM RT.  */
	Lisp_Object xs;
    
	xs = XSYMBOL (sym)->value;
	if (current_buffer == XBUFFER (XCONS (XCONS (xs)->cdr)->car))
	  XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car = Qnil; 
      }
    }
  return sym;
}

DEFUN ("kill-local-variable", Fkill_local_variable, Skill_local_variable,
  1, 1, "vKill Local Variable: ",
  "Make VARIABLE no longer have a separate value in the current buffer.\n\
From now on the default value will apply in this buffer.")
  (sym)
     register Lisp_Object sym;
{
  register Lisp_Object tem, valcontents;

  CHECK_SYMBOL (sym, 0);

  valcontents = XSYMBOL (sym)->value;

  if (XTYPE (valcontents) == Lisp_Buffer_Objfwd)
    {
      register int idx = XUINT (valcontents);
      register int mask = *(int *) (idx + (char *) &buffer_local_flags);

      if (mask > 0)
	{
	  *(Lisp_Object *)(idx + (char *) current_buffer)
	    = *(Lisp_Object *)(idx + (char *) &buffer_defaults);
	  current_buffer->local_var_flags &= ~mask;
	}
      return sym;
    }

  if (XTYPE (valcontents) != Lisp_Buffer_Local_Value &&
      XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value)
    return sym;

  /* Get rid of this buffer's alist element, if any */

  tem = Fassq (sym, current_buffer->local_var_alist);
  if (!NULL (tem))
    current_buffer->local_var_alist = Fdelq (tem, current_buffer->local_var_alist);

  /* Make sure symbol does not think it is set up for this buffer;
     force it to look once again for this buffer's value */
  {
    Lisp_Object sv;
    sv = XSYMBOL (sym)->value;
    if (current_buffer == XBUFFER (XCONS (XCONS (sv)->cdr)->car))
      XCONS (XCONS (sv)->cdr)->car = Qnil;
  }

  return sym;
}

/* Extract and set vector and string elements */

DEFUN ("aref", Faref, Saref, 2, 2, 0,
  "Return the element of ARRAY at index INDEX.\n\
ARRAY may be a vector or a string.  INDEX starts at 0.")
  (vector, idx)
     register Lisp_Object vector;
     Lisp_Object idx;
{
  register int idxval;

  CHECK_NUMBER (idx, 1);
  idxval = XINT (idx);
  if (XTYPE (vector) != Lisp_Vector && XTYPE (vector) != Lisp_String)
    vector = wrong_type_argument (Qarrayp, vector);
  if (idxval < 0 || idxval >= XVECTOR (vector)->size)
    args_out_of_range (vector, idx);
  if (XTYPE (vector) == Lisp_Vector)
    return XVECTOR (vector)->contents[idxval];
  else
    {
      Lisp_Object val;
      XFASTINT (val) = (unsigned char) XSTRING (vector)->data[idxval];
      return val;
    }
}

DEFUN ("aset", Faset, Saset, 3, 3, 0,
  "Store into the element of ARRAY at index INDEX the value NEWVAL.\n\
ARRAY may be a vector or a string.  INDEX starts at 0.")
  (vector, idx, newelt)
     register Lisp_Object vector;
     Lisp_Object idx, newelt;
{
  register int idxval;

  CHECK_NUMBER (idx, 1);
  idxval = XINT (idx);
  if (XTYPE (vector) != Lisp_Vector && XTYPE (vector) != Lisp_String)
    vector = wrong_type_argument (Qarrayp, vector);
  if (idxval < 0 || idxval >= XVECTOR (vector)->size)
    args_out_of_range (vector, idx);
  CHECK_IMPURE (vector);

  if (XTYPE (vector) == Lisp_Vector)
    XVECTOR (vector)->contents[idxval] = newelt;
  else
    XSTRING (vector)->data[idxval] = XINT (newelt);

  return newelt;
}

Lisp_Object
Farray_length (vector)
     register Lisp_Object vector;
{
  register Lisp_Object size;
  if (XTYPE (vector) != Lisp_Vector && XTYPE (vector) != Lisp_String)
    vector = wrong_type_argument (Qarrayp, vector);
  XFASTINT (size) = XVECTOR (vector)->size;
  return size;
}

/* Arithmetic functions */

DEFUN ("=", Feqlsign, Seqlsign, 2, 2, 0,
  "T if two args, both numbers, are equal.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) == XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN ("<", Flss, Slss, 2, 2, 0,
  "T if first arg is less than second arg.  Both must be numbers.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) < XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN (">", Fgtr, Sgtr, 2, 2, 0,
  "T if first arg is greater than second arg.  Both must be numbers.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) > XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN ("<=", Fleq, Sleq, 2, 2, 0,
  "T if first arg is less than or equal to second arg.  Both must be numbers.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) <= XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN (">=", Fgeq, Sgeq, 2, 2, 0,
  "T if first arg is greater than or equal to second arg.  Both must be numbers.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) >= XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN ("/=", Fneq, Sneq, 2, 2, 0,
  "T if first arg is not equal to second arg.  Both must be numbers.")
  (num1, num2)
     register Lisp_Object num1, num2;
{
  CHECK_NUMBER_COERCE_MARKER (num1, 0);
  CHECK_NUMBER_COERCE_MARKER (num2, 0);

  if (XINT (num1) != XINT (num2))
    return Qt;
  return Qnil;
}

DEFUN ("zerop", Fzerop, Szerop, 1, 1, 0, "T if NUMBER is zero.")
  (num)
     register Lisp_Object num;
{
  CHECK_NUMBER (num, 0);

  if (!XINT (num))
    return Qt;
  return Qnil;
}

DEFUN ("int-to-string", Fint_to_string, Sint_to_string, 1, 1, 0,
  "Convert INT to a string by printing it in decimal, with minus sign if negative.")
  (num)