1  /* Implementation of the GETCWD intrinsic.
       2     Copyright (C) 2004-2023 Free Software Foundation, Inc.
       3     Contributed by Steven G. Kargl <kargls@comcast.net>.
       4  
       5  This file is part of the GNU Fortran 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 3 of the License, or (at your option) any later version.
      11  
      12  Libgfortran is distributed in the hope that it will be useful,
      13  but WITHOUT ANY WARRANTY; without even the implied warranty of
      14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15  GNU General Public License for more details.
      16  
      17  Under Section 7 of GPL version 3, you are granted additional
      18  permissions described in the GCC Runtime Library Exception, version
      19  3.1, as published by the Free Software Foundation.
      20  
      21  You should have received a copy of the GNU General Public License and
      22  a copy of the GCC Runtime Library Exception along with this program;
      23  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24  <http://www.gnu.org/licenses/>.  */
      25  
      26  #include "libgfortran.h"
      27  
      28  #include <string.h>
      29  #include <errno.h>
      30  
      31  #ifdef HAVE_UNISTD_H
      32  #include <unistd.h>
      33  #endif
      34  
      35  #ifdef HAVE_GETCWD
      36  
      37  extern void getcwd_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
      38  iexport_proto(getcwd_i4_sub);
      39  
      40  void
      41  getcwd_i4_sub (char *cwd, GFC_INTEGER_4 *status, gfc_charlen_type cwd_len)
      42  {
      43    int err;
      44  
      45    if (getcwd (cwd, cwd_len))
      46      {
      47        size_t len = strlen (cwd);
      48        memset (cwd + len, ' ', cwd_len - len);
      49        err = 0;
      50      }
      51    else if (errno == ERANGE)
      52      {
      53        /* There is a possibility that the previous attempt failed due
      54  	 to not enough space for the terminating null byte. Try again
      55  	 with a buffer one char longer.  */
      56        char *buf = xmalloc (cwd_len + 1);
      57        if (getcwd (buf, cwd_len + 1))
      58  	{
      59  	  memcpy (cwd, buf, cwd_len);
      60  	  err = 0;
      61  	}
      62        else
      63  	err = errno;
      64        free (buf);
      65      }
      66    else
      67      err = errno;
      68    if (err)
      69      memset (cwd, ' ', cwd_len);
      70    if (status != NULL)
      71      *status = err;
      72  }
      73  iexport(getcwd_i4_sub);
      74  
      75  extern void getcwd_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
      76  export_proto(getcwd_i8_sub);
      77  
      78  void
      79  getcwd_i8_sub (char *cwd, GFC_INTEGER_8 *status, gfc_charlen_type cwd_len)
      80  {
      81    GFC_INTEGER_4 status4;
      82    getcwd_i4_sub (cwd, &status4, cwd_len);
      83    if (status)
      84      *status = status4;
      85  }
      86  
      87  extern GFC_INTEGER_4 PREFIX(getcwd) (char *, gfc_charlen_type);
      88  export_proto_np(PREFIX(getcwd));
      89  
      90  GFC_INTEGER_4
      91  PREFIX(getcwd) (char *cwd, gfc_charlen_type cwd_len)
      92  {
      93    GFC_INTEGER_4 status;
      94    getcwd_i4_sub (cwd, &status, cwd_len);
      95    return status;
      96  }
      97  
      98  #endif