libguile/boolean.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, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 #include "boolean.h"
  47 \f
  48
  49
  50 SCM_PROC(s_not, "not", 1, 0, 0, scm_not);
  51
  52 SCM
  53 scm_not(x)
  54      SCM x;
  55 {
  56         return SCM_FALSEP(x) ? SCM_BOOL_T : SCM_BOOL_F;
  57 }
  58
  59
  60 SCM_PROC(s_boolean_p, "boolean?", 1, 0, 0, scm_boolean_p);
  61
  62 SCM
  63 scm_boolean_p(obj)
  64      SCM obj;
  65 {
  66         if (SCM_BOOL_F==obj) return SCM_BOOL_T;
  67         if (SCM_BOOL_T==obj) return SCM_BOOL_T;
  68         return SCM_BOOL_F;
  69 }
  70
  71
  72
  73 void
  74 scm_init_boolean ()
  75 {
  76 #include "boolean.x"
  77 }
  78