Import guile-1.8 as multiple upstream tarball component

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

diff --git a/guile18/libguile/feature.c b/guile18/libguile/feature.c
new file mode 100644 (file)
index 0000000..8283cd6
--- /dev/null
+++ b/guile18/libguile/feature.c
@@ -0,0 +1,132 @@
+/* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2004, 2006, 2007 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
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#include "libguile/_scm.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/validate.h"
+#include "libguile/fluids.h"
+
+#include "libguile/feature.h"
+
+\f
+
+static SCM progargs_fluid;
+static SCM features_var;
+
+void
+scm_add_feature (const char *str)
+{
+  SCM old = SCM_VARIABLE_REF (features_var);
+  SCM new = scm_cons (scm_from_locale_symbol (str), old);
+  SCM_VARIABLE_SET (features_var, new);
+}
+
+\f
+
+SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0, 
+           (),
+           "@deffnx {Scheme Procedure} command-line\n"
+           "Return the list of command line arguments passed to Guile, as a list of\n"
+           "strings.  The list includes the invoked program name, which is usually\n"
+           "@code{\"guile\"}, but excludes switches and parameters for command line\n"
+           "options like @code{-e} and @code{-l}.")
+#define FUNC_NAME s_scm_program_arguments
+{
+  return scm_fluid_ref (progargs_fluid);
+}
+#undef FUNC_NAME
+
+/* Set the value returned by program-arguments, given ARGC and ARGV.
+
+   If FIRST is non-zero, make it the first element; we do this in
+   situations where other code (like getopt) has parsed out a few
+   arguments, but we still want the script name to be the first
+   element.  */
+void
+scm_set_program_arguments (int argc, char **argv, char *first)
+{
+  SCM args = scm_makfromstrs (argc, argv);
+  if (first)
+    args = scm_cons (scm_from_locale_string (first), args);
+  scm_fluid_set_x (progargs_fluid, args);
+}
+
+SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0, 
+           (SCM lst),
+           "Set the command line arguments to be returned by\n"
+           "@code{program-arguments} (and @code{command-line}).  @var{lst}\n"
+           "should be a list of strings, the first of which is the program\n"
+           "name (either a script name, or just @code{\"guile\"}).\n"
+           "\n"
+           "Program arguments are held in a fluid and therefore have a\n"
+           "separate value in each Guile thread.  Neither the list nor the\n"
+           "strings within it are copied, so should not be modified later.")
+#define FUNC_NAME s_scm_set_program_arguments_scm
+{
+  return scm_fluid_set_x (progargs_fluid, lst);
+}
+#undef FUNC_NAME
+
+
+\f
+
+void
+scm_init_feature()
+{
+  progargs_fluid = scm_permanent_object (scm_make_fluid ());
+
+  features_var = scm_c_define ("*features*", SCM_EOL);
+#ifndef _Windows
+  scm_add_feature("system");
+#endif
+#ifdef vms
+  scm_add_feature(s_ed);
+#endif
+#ifdef SICP
+  scm_add_feature("sicp");
+#endif
+#ifndef GO32
+  scm_add_feature("char-ready?");
+#endif
+#ifndef CHEAP_CONTINUATIONS
+  scm_add_feature ("full-continuation");
+#endif
+#if SCM_USE_PTHREAD_THREADS
+  scm_add_feature ("threads");
+#endif
+
+  scm_c_define ("char-code-limit", scm_from_int (SCM_CHAR_CODE_LIMIT));
+
+#include "libguile/feature.x"
+}
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/