libguile/boolean.c

   1 /*      Copyright (C) 1995, 1996, 2000, 2001 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
  42
  43 \f
  44
  45 #include "libguile/_scm.h"
  46
  47 #include "libguile/validate.h"
  48 #include "libguile/boolean.h"
  49 #include "libguile/lang.h"
  50 \f
  51
  52
  53 SCM_DEFINE (scm_not, "not", 1, 0, 0,
  54             (SCM x),
  55             "Return @code{#t} iff @var{x} is @code{#f}, else return @code{#f}.")
  56 #define FUNC_NAME s_scm_not
  57 {
  58   return SCM_BOOL(SCM_FALSEP (x) || SCM_NILP (x));
  59 }
  60 #undef FUNC_NAME
  61
  62
  63 SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0,
  64            (SCM obj),
  65             "Return @code{#t} iff @var{obj} is either @code{#t} or @code{#f}.")
  66 #define FUNC_NAME s_scm_boolean_p
  67 {
  68   return SCM_BOOL (SCM_BOOLP (obj) || SCM_NILP (obj));
  69 }
  70 #undef FUNC_NAME
  71
  72
  73
  74 void
  75 scm_init_boolean ()
  76 {
  77 #ifndef SCM_MAGIC_SNARFER
  78 #include "libguile/boolean.x"
  79 #endif
  80 }
  81
  82
  83 /*
  84   Local Variables:
  85   c-file-style: "gnu"
  86   End:
  87 */