libguile/markers.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 \f
  47
  48 /* {GC marking}
  49  */
  50
  51 #ifdef __STDC__
  52 SCM
  53 scm_mark0 (SCM ptr)
  54 #else
  55 SCM
  56 scm_mark0 (ptr)
  57      SCM ptr;
  58 #endif
  59 {
  60   SCM_SETGC8MARK (ptr);
  61   return SCM_BOOL_F;
  62 }
  63
  64
  65 #ifdef __STDC__
  66 SCM
  67 scm_markcdr (SCM ptr)
  68 #else
  69 SCM
  70 scm_markcdr (ptr)
  71      SCM ptr;
  72 #endif
  73 {
  74   if (SCM_GC8MARKP (ptr))
  75     return SCM_BOOL_F;
  76   SCM_SETGC8MARK (ptr);
  77   return SCM_CDR (ptr);
  78 }
  79
  80 #ifdef __STDC__
  81 scm_sizet
  82 scm_free0 (SCM ptr)
  83 #else
  84 scm_sizet
  85 scm_free0 (ptr)
  86      SCM ptr;
  87 #endif
  88 {
  89   return 0;
  90 }
  91
  92