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getcwd.c revision 1.1.1.4 
      1 /* Implementation of the GETCWD intrinsic.
      2    Copyright (C) 2004-2024 Free Software Foundation, Inc.
      3    Contributed by Steven G. Kargl <kargls (at) 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
     99