libguile/feature.c

   1 /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18
  19 \f
  20 #if HAVE_CONFIG_H
  21 #  include <config.h>
  22 #endif
  23
  24 #ifdef HAVE_STRING_H
  25 #include <string.h>
  26 #endif
  27
  28 #include "libguile/_scm.h"
  29 #include "libguile/root.h"
  30 #include "libguile/strings.h"
  31 #include "libguile/validate.h"
  32
  33 #include "libguile/feature.h"
  34
  35 \f
  36
  37 static SCM features_var;
  38
  39
  40 void
  41 scm_add_feature (const char *str)
  42 {
  43   SCM old = SCM_VARIABLE_REF (features_var);
  44   SCM new = scm_cons (scm_str2symbol (str), old);
  45   SCM_VARIABLE_SET (features_var, new);
  46 }
  47
  48 \f
  49
  50 SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
  51             (),
  52             "@deffnx {Scheme Procedure} command-line\n"
  53             "Return the list of command line arguments passed to Guile, as a list of\n"
  54             "strings.  The list includes the invoked program name, which is usually\n"
  55             "@code{\"guile\"}, but excludes switches and parameters for command line\n"
  56             "options like @code{-e} and @code{-l}.")
  57 #define FUNC_NAME s_scm_program_arguments
  58 {
  59   return scm_progargs;
  60 }
  61 #undef FUNC_NAME
  62
  63 /* Set the value returned by program-arguments, given ARGC and ARGV.
  64
  65    If FIRST is non-zero, make it the first element; we do this in
  66    situations where other code (like getopt) has parsed out a few
  67    arguments, but we still want the script name to be the first
  68    element.  */
  69 void
  70 scm_set_program_arguments (int argc, char **argv, char *first)
  71 {
  72   scm_progargs = scm_makfromstrs (argc, argv);
  73   if (first)
  74     scm_progargs = scm_cons (scm_makfrom0str (first), scm_progargs);
  75 }
  76
  77
  78 \f
  79
  80 void
  81 scm_init_feature()
  82 {
  83   features_var = scm_c_define ("*features*", SCM_EOL);
  84 #ifndef _Windows
  85   scm_add_feature("system");
  86 #endif
  87 #ifdef vms
  88   scm_add_feature(s_ed);
  89 #endif
  90 #ifdef SICP
  91   scm_add_feature("sicp");
  92 #endif
  93 #ifndef GO32
  94   scm_add_feature("char-ready?");
  95 #endif
  96 #ifndef CHEAP_CONTINUATIONS
  97   scm_add_feature ("full-continuation");
  98 #endif
  99 #if SCM_USE_NULL_THREADS
 100   scm_add_feature ("threads");
 101 #endif
 102
 103   scm_c_define ("char-code-limit", SCM_MAKINUM (SCM_CHAR_CODE_LIMIT));
 104
 105 #include "libguile/feature.x"
 106 }
 107
 108 /*
 109   Local Variables:
 110   c-file-style: "gnu"
 111   End:
 112 */