libgfortran/intrinsics/getlog.c

   1 /* Implementation of the GETLOG g77 intrinsic.
   2    Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   3    Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "libgfortran.h"
  32
  33 #include <string.h>
  34
  35 #ifdef HAVE_UNISTD_H
  36 #include <unistd.h>
  37 #endif
  38 #ifdef HAVE_PWD_H
  39 #include <pwd.h>
  40 #endif
  41
  42 /* Windows32 version */
  43 #if defined __MINGW32__ && !defined  HAVE_GETLOGIN
  44 #define WIN32_LEAN_AND_MEAN
  45 #include <windows.h>
  46 #include <lmcons.h>  /* for UNLEN */
  47
  48 static char *
  49 w32_getlogin (void)
  50 {
  51   static char name [UNLEN + 1];
  52   DWORD namelen = sizeof (name);
  53
  54   GetUserName (name, &namelen);
  55   return (name[0] == 0 ?  NULL : name);
  56 }
  57
  58 #undef getlogin
  59 #define getlogin w32_getlogin
  60 #define HAVE_GETLOGIN 1
  61
  62 #endif
  63
  64
  65 /* GETLOG (LOGIN), g77 intrinsic for retrieving the login name for the
  66    process.
  67    CHARACTER(len=*), INTENT(OUT) :: LOGIN  */
  68
  69 void PREFIX(getlog) (char *, gfc_charlen_type);
  70 export_proto_np(PREFIX(getlog));
  71
  72 void
  73 PREFIX(getlog) (char * login, gfc_charlen_type login_len)
  74 {
  75   int p_len;
  76   char *p;
  77
  78   memset (login, ' ', login_len); /* Blank the string.  */
  79
  80 #if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
  81   {
  82     struct passwd *pw = getpwuid (geteuid ());
  83     if (pw)
  84       p = pw->pw_name;
  85     else
  86       return;
  87   }
  88 #else
  89 # ifdef HAVE_GETLOGIN
  90   p = getlogin();
  91 # else
  92   return;
  93 # endif
  94 #endif
  95
  96   if (p == NULL)
  97     return;
  98
  99   p_len = strlen (p);
 100   if (login_len < p_len)
 101     memcpy (login, p, login_len);
 102   else
 103     memcpy (login, p, p_len);
 104 }