libguile/feature.c

   1 /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2004, 2006, 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17
  18
  19 \f
  20 #ifdef 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 #include "libguile/fluids.h"
  33
  34 #include "libguile/feature.h"
  35
  36 \f
  37
  38 static SCM progargs_fluid;
  39 static SCM features_var;
  40
  41 void
  42 scm_add_feature (const char *str)
  43 {
  44   SCM old = SCM_VARIABLE_REF (features_var);
  45   SCM new = scm_cons (scm_from_locale_symbol (str), old);
  46   SCM_VARIABLE_SET (features_var, new);
  47 }
  48
  49 \f
  50
  51 SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
  52             (),
  53             "@deffnx {Scheme Procedure} command-line\n"
  54             "Return the list of command line arguments passed to Guile, as a list of\n"
  55             "strings.  The list includes the invoked program name, which is usually\n"
  56             "@code{\"guile\"}, but excludes switches and parameters for command line\n"
  57             "options like @code{-e} and @code{-l}.")
  58 #define FUNC_NAME s_scm_program_arguments
  59 {
  60   return scm_fluid_ref (progargs_fluid);
  61 }
  62 #undef FUNC_NAME
  63
  64 /* Set the value returned by program-arguments, given ARGC and ARGV.
  65
  66    If FIRST is non-zero, make it the first element; we do this in
  67    situations where other code (like getopt) has parsed out a few
  68    arguments, but we still want the script name to be the first
  69    element.  */
  70 void
  71 scm_set_program_arguments (int argc, char **argv, char *first)
  72 {
  73   SCM args = scm_makfromstrs (argc, argv);
  74   if (first)
  75     args = scm_cons (scm_from_locale_string (first), args);
  76   scm_fluid_set_x (progargs_fluid, args);
  77 }
  78
  79 SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0,
  80             (SCM lst),
  81             "Set the command line arguments to be returned by\n"
  82             "@code{program-arguments} (and @code{command-line}).  @var{lst}\n"
  83             "should be a list of strings, the first of which is the program\n"
  84             "name (either a script name, or just @code{\"guile\"}).\n"
  85             "\n"
  86             "Program arguments are held in a fluid and therefore have a\n"
  87             "separate value in each Guile thread.  Neither the list nor the\n"
  88             "strings within it are copied, so should not be modified later.")
  89 #define FUNC_NAME s_scm_set_program_arguments_scm
  90 {
  91   return scm_fluid_set_x (progargs_fluid, lst);
  92 }
  93 #undef FUNC_NAME
  94
  95
  96 \f
  97
  98 void
  99 scm_init_feature()
 100 {
 101   progargs_fluid = scm_permanent_object (scm_make_fluid ());
 102
 103   features_var = scm_c_define ("*features*", SCM_EOL);
 104 #ifndef _Windows
 105   scm_add_feature("system");
 106 #endif
 107 #ifdef vms
 108   scm_add_feature(s_ed);
 109 #endif
 110 #ifdef SICP
 111   scm_add_feature("sicp");
 112 #endif
 113 #ifndef GO32
 114   scm_add_feature("char-ready?");
 115 #endif
 116 #ifndef CHEAP_CONTINUATIONS
 117   scm_add_feature ("full-continuation");
 118 #endif
 119 #if SCM_USE_PTHREAD_THREADS
 120   scm_add_feature ("threads");
 121 #endif
 122
 123   scm_c_define ("char-code-limit", scm_from_int (SCM_CHAR_CODE_LIMIT));
 124
 125 #include "libguile/feature.x"
 126 }
 127
 128 /*
 129   Local Variables:
 130   c-file-style: "gnu"
 131   End:
 132 */