libguile/feature.c

   1 /*      Copyright (C) 1995, 1996, 1998, 1999, 2000 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 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46
  47 #ifdef HAVE_STRING_H
  48 #include <string.h>
  49 #endif
  50
  51 #include "libguile/_scm.h"
  52 #include "libguile/root.h"
  53 #include "libguile/strings.h"
  54 #include "libguile/validate.h"
  55
  56 #include "libguile/feature.h"
  57
  58 \f
  59
  60 static SCM features;
  61
  62
  63 void
  64 scm_add_feature (const char *str)
  65 {
  66   SCM old = SCM_CDR (features);
  67   SCM new = scm_cons (scm_str2symbol (str), old);
  68   SCM_SETCDR (features, new);
  69 }
  70
  71 \f
  72
  73 SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
  74             (),
  75             "@deffnx procedure command-line\n"
  76             "Return the list of command line arguments passed to Guile, as a list of\n"
  77             "strings.  The list includes the invoked program name, which is usually\n"
  78             "@code{\"guile\"}, but excludes switches and parameters for command line\n"
  79             "options like @code{-e} and @code{-l}.")
  80 #define FUNC_NAME s_scm_program_arguments
  81 {
  82   return scm_progargs;
  83 }
  84 #undef FUNC_NAME
  85
  86 /* Set the value returned by program-arguments, given ARGC and ARGV.
  87
  88    If FIRST is non-zero, make it the first element; we do this in
  89    situations where other code (like getopt) has parsed out a few
  90    arguments, but we still want the script name to be the first
  91    element.  */
  92 void
  93 scm_set_program_arguments (int argc, char **argv, char *first)
  94 {
  95   scm_progargs = scm_makfromstrs (argc, argv);
  96   if (first)
  97     scm_progargs = scm_cons (scm_makfrom0str (first), scm_progargs);
  98 }
  99
 100
 101 \f
 102
 103 void
 104 scm_init_feature()
 105 {
 106   features = scm_sysintern ("*features*", SCM_EOL);
 107 #ifdef SCM_RECKLESS
 108   scm_add_feature("reckless");
 109 #endif
 110 #ifndef _Windows
 111   scm_add_feature("system");
 112 #endif
 113 #ifdef vms
 114   scm_add_feature(s_ed);
 115 #endif
 116 #ifdef SICP
 117   scm_add_feature("sicp");
 118 #endif
 119 #ifndef GO32
 120   scm_add_feature("char-ready?");
 121 #endif
 122 #ifndef CHEAP_CONTINUATIONS
 123   scm_add_feature ("full-continuation");
 124 #endif
 125 #ifdef USE_THREADS
 126   scm_add_feature ("threads");
 127 #endif
 128
 129   scm_sysintern ("char-code-limit", SCM_MAKINUM (SCM_CHAR_CODE_LIMIT));
 130
 131 #ifndef SCM_MAGIC_SNARFER
 132 #include "libguile/feature.x"
 133 #endif
 134 }
 135
 136 /*
 137   Local Variables:
 138   c-file-style: "gnu"
 139   End:
 140 */