libguile/feature.c

   1 /* Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   2  *   2006, 2007, 2009, 2011, 2013 Free Software Foundation, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public License
   6  * as published by the Free Software Foundation; either version 3 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA
  18  */
  19
  20
  21 \f
  22 #ifdef HAVE_CONFIG_H
  23 #  include <config.h>
  24 #endif
  25
  26 #ifdef HAVE_STRING_H
  27 #include <string.h>
  28 #endif
  29
  30 #include "libguile/_scm.h"
  31 #include "libguile/root.h"
  32 #include "libguile/strings.h"
  33 #include "libguile/validate.h"
  34 #include "libguile/fluids.h"
  35
  36 #include "libguile/feature.h"
  37
  38 \f
  39
  40 SCM scm_program_arguments_fluid;
  41
  42 static SCM features_var;
  43
  44 void
  45 scm_add_feature (const char *str)
  46 {
  47   SCM old = SCM_VARIABLE_REF (features_var);
  48   SCM new = scm_cons (scm_from_utf8_symbol (str), old);
  49   SCM_VARIABLE_SET (features_var, new);
  50 }
  51
  52 \f
  53
  54 SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
  55             (),
  56             "@deffnx {Scheme Procedure} command-line\n"
  57             "Return the list of command line arguments passed to Guile, as a list of\n"
  58             "strings.  The list includes the invoked program name, which is usually\n"
  59             "@code{\"guile\"}, but excludes switches and parameters for command line\n"
  60             "options like @code{-e} and @code{-l}.")
  61 #define FUNC_NAME s_scm_program_arguments
  62 {
  63   return scm_fluid_ref (scm_program_arguments_fluid);
  64 }
  65 #undef FUNC_NAME
  66
  67 /* Set the value returned by program-arguments, given ARGC and ARGV.
  68
  69    If FIRST is non-zero, make it the first element; we do this in
  70    situations where other code (like getopt) has parsed out a few
  71    arguments, but we still want the script name to be the first
  72    element.  */
  73 void
  74 scm_set_program_arguments (int argc, char **argv, char *first)
  75 {
  76   SCM args = scm_makfromstrs (argc, argv);
  77   if (first)
  78     args = scm_cons (scm_from_locale_string (first), args);
  79   scm_fluid_set_x (scm_program_arguments_fluid, args);
  80 }
  81
  82 SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0,
  83             (SCM lst),
  84             "Set the command line arguments to be returned by\n"
  85             "@code{program-arguments} (and @code{command-line}).  @var{lst}\n"
  86             "should be a list of strings, the first of which is the program\n"
  87             "name (either a script name, or just @code{\"guile\"}).\n"
  88             "\n"
  89             "Program arguments are held in a fluid and therefore have a\n"
  90             "separate value in each Guile thread.  Neither the list nor the\n"
  91             "strings within it are copied, so should not be modified later.")
  92 #define FUNC_NAME s_scm_set_program_arguments_scm
  93 {
  94   return scm_fluid_set_x (scm_program_arguments_fluid, lst);
  95 }
  96 #undef FUNC_NAME
  97
  98
  99 \f
 100
 101 void
 102 scm_init_feature()
 103 {
 104   scm_program_arguments_fluid = scm_make_fluid ();
 105
 106   features_var = scm_c_define ("*features*", SCM_EOL);
 107 #ifndef _Windows
 108   scm_add_feature("system");
 109 #endif
 110 #ifdef vms
 111   scm_add_feature(s_ed);
 112 #endif
 113 #ifndef GO32
 114   scm_add_feature("char-ready?");
 115 #endif
 116 #if SCM_USE_PTHREAD_THREADS
 117   scm_add_feature ("threads");
 118 #endif
 119
 120 #include "libguile/feature.x"
 121 }
 122
 123 /*
 124   Local Variables:
 125   c-file-style: "gnu"
 126   End:
 127 */