libguile/feature.c

   1 /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2004, 2006, 2007, 2009, 2011 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 License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * 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
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #ifdef HAVE_STRING_H
  26 #include <string.h>
  27 #endif
  28
  29 #include "libguile/_scm.h"
  30 #include "libguile/root.h"
  31 #include "libguile/strings.h"
  32 #include "libguile/validate.h"
  33 #include "libguile/fluids.h"
  34
  35 #include "libguile/feature.h"
  36
  37 \f
  38
  39 static SCM progargs_fluid;
  40 static SCM features_var;
  41
  42 void
  43 scm_add_feature (const char *str)
  44 {
  45   SCM old = SCM_VARIABLE_REF (features_var);
  46   SCM new = scm_cons (scm_from_utf8_symbol (str), old);
  47   SCM_VARIABLE_SET (features_var, new);
  48 }
  49
  50 \f
  51
  52 SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
  53             (),
  54             "@deffnx {Scheme Procedure} command-line\n"
  55             "Return the list of command line arguments passed to Guile, as a list of\n"
  56             "strings.  The list includes the invoked program name, which is usually\n"
  57             "@code{\"guile\"}, but excludes switches and parameters for command line\n"
  58             "options like @code{-e} and @code{-l}.")
  59 #define FUNC_NAME s_scm_program_arguments
  60 {
  61   return scm_fluid_ref (progargs_fluid);
  62 }
  63 #undef FUNC_NAME
  64
  65 /* Set the value returned by program-arguments, given ARGC and ARGV.
  66
  67    If FIRST is non-zero, make it the first element; we do this in
  68    situations where other code (like getopt) has parsed out a few
  69    arguments, but we still want the script name to be the first
  70    element.  */
  71 void
  72 scm_set_program_arguments (int argc, char **argv, char *first)
  73 {
  74   SCM args = scm_makfromstrs (argc, argv);
  75   if (first)
  76     args = scm_cons (scm_from_locale_string (first), args);
  77   scm_fluid_set_x (progargs_fluid, args);
  78 }
  79
  80 SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0,
  81             (SCM lst),
  82             "Set the command line arguments to be returned by\n"
  83             "@code{program-arguments} (and @code{command-line}).  @var{lst}\n"
  84             "should be a list of strings, the first of which is the program\n"
  85             "name (either a script name, or just @code{\"guile\"}).\n"
  86             "\n"
  87             "Program arguments are held in a fluid and therefore have a\n"
  88             "separate value in each Guile thread.  Neither the list nor the\n"
  89             "strings within it are copied, so should not be modified later.")
  90 #define FUNC_NAME s_scm_set_program_arguments_scm
  91 {
  92   return scm_fluid_set_x (progargs_fluid, lst);
  93 }
  94 #undef FUNC_NAME
  95
  96
  97 \f
  98
  99 void
 100 scm_init_feature()
 101 {
 102   progargs_fluid = scm_make_fluid ();
 103
 104   features_var = scm_c_define ("*features*", SCM_EOL);
 105 #ifndef _Windows
 106   scm_add_feature("system");
 107 #endif
 108 #ifdef vms
 109   scm_add_feature(s_ed);
 110 #endif
 111 #ifndef GO32
 112   scm_add_feature("char-ready?");
 113 #endif
 114 #if SCM_USE_PTHREAD_THREADS
 115   scm_add_feature ("threads");
 116 #endif
 117
 118 #include "libguile/feature.x"
 119 }
 120
 121 /*
 122   Local Variables:
 123   c-file-style: "gnu"
 124   End:
 125 */