Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / boolean.c

diff --git a/guile18/libguile/boolean.c b/guile18/libguile/boolean.c
new file mode 100644 (file)
index 0000000..4b06e04
--- /dev/null
+++ b/guile18/libguile/boolean.c
@@ -0,0 +1,81 @@
+/*     Copyright (C) 1995, 1996, 2000, 2001, 2006, 2008 Free Software Foundation, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+
+#include "libguile/validate.h"
+#include "libguile/boolean.h"
+#include "libguile/lang.h"
+#include "libguile/tags.h"
+
+\f
+
+
+SCM_DEFINE (scm_not, "not", 1, 0, 0, 
+            (SCM x),
+            "Return @code{#t} iff @var{x} is @code{#f}, else return @code{#f}.")
+#define FUNC_NAME s_scm_not
+{
+  return scm_from_bool (scm_is_false (x) || SCM_NILP (x));
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0, 
+           (SCM obj),
+            "Return @code{#t} iff @var{obj} is either @code{#t} or @code{#f}.")
+#define FUNC_NAME s_scm_boolean_p
+{
+  return scm_from_bool (scm_is_bool (obj) || SCM_NILP (obj));
+}
+#undef FUNC_NAME
+
+int
+scm_is_bool (SCM x)
+{
+  return scm_is_eq (x, SCM_BOOL_F) || scm_is_eq (x, SCM_BOOL_T);
+}
+
+int
+scm_to_bool (SCM x)
+{
+  if (scm_is_eq (x, SCM_BOOL_F))
+    return 0;
+  else if (scm_is_eq (x, SCM_BOOL_T))
+    return 1;
+  else    
+    scm_wrong_type_arg (NULL, 0, x);
+}
+
+void
+scm_init_boolean ()
+{
+#include "libguile/boolean.x"
+}
+
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/