libguile/feature.c

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