libgm2/libm2pim/UnixArgs.cc

   1 /* UnixArgs.cc record argc, argv as global variables.
   2
   3 Copyright (C) 2009-2022 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include <config.h>
  28 #include <m2rts.h>
  29
  30 #define EXPORT(FUNC) m2pim ## _UnixArgs_ ## FUNC
  31 #define M2EXPORT(FUNC) m2pim ## _M2_UnixArgs_ ## FUNC
  32 #define M2LIBNAME "m2pim"
  33
  34 extern "C" int EXPORT(GetArgC) (void);
  35 extern "C" char **EXPORT(GetArgV) (void);
  36 extern "C" char **EXPORT(GetEnvV) (void);
  37
  38 static int UnixArgs_ArgC;
  39 static char **UnixArgs_ArgV;
  40 static char **UnixArgs_EnvV;
  41
  42
  43 /* GetArgC returns argc.  */
  44
  45 extern "C" int
  46 EXPORT(GetArgC) (void)
  47 {
  48   return UnixArgs_ArgC;
  49 }
  50
  51
  52 /* GetArgV returns argv.  */
  53
  54 extern "C" char **
  55 EXPORT(GetArgV) (void)
  56 {
  57   return UnixArgs_ArgV;
  58 }
  59
  60
  61 /* GetEnvV returns envv.  */
  62
  63 extern "C" char **
  64 EXPORT(GetEnvV) (void)
  65 {
  66   return UnixArgs_EnvV;
  67 }
  68
  69
  70 /* GNU Modula-2 linking hooks.  */
  71
  72 extern "C" void
  73 M2EXPORT(init) (int argc, char **argv, char **envp)
  74 {
  75   UnixArgs_ArgC = argc;
  76   UnixArgs_ArgV = argv;
  77   UnixArgs_EnvV = envp;
  78 }
  79
  80 extern "C" void
  81 M2EXPORT(fini) (int, char **, char **)
  82 {
  83 }
  84
  85 extern "C" void
  86 M2EXPORT(dep) (void)
  87 {
  88 }
  89
  90 extern "C" void __attribute__((__constructor__))
  91 M2EXPORT(ctor) (void)
  92 {
  93   m2pim_M2RTS_RegisterModule ("UnixArgs", M2LIBNAME,
  94                               M2EXPORT(init), M2EXPORT(fini),
  95                               M2EXPORT(dep));
  96 }