libgfortran/intrinsics/getcwd.c

   1 /* Implementation of the GETCWD intrinsic.
   2    Copyright (C) 2004-2016 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 <stdlib.h>
  29 #include <string.h>
  30 #include <errno.h>
  31
  32 #ifdef HAVE_UNISTD_H
  33 #include <unistd.h>
  34 #endif
  35
  36 #ifdef HAVE_GETCWD
  37
  38 extern void getcwd_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
  39 iexport_proto(getcwd_i4_sub);
  40
  41 void
  42 getcwd_i4_sub (char *cwd, GFC_INTEGER_4 *status, gfc_charlen_type cwd_len)
  43 {
  44   int err;
  45
  46   if (getcwd (cwd, cwd_len))
  47     {
  48       size_t len = strlen (cwd);
  49       memset (cwd + len, ' ', cwd_len - len);
  50       err = 0;
  51     }
  52   else if (errno == ERANGE)
  53     {
  54       /* There is a possibility that the previous attempt failed due
  55          to not enough space for the terminating null byte. Try again
  56          with a buffer one char longer.  */
  57       char *buf = xmalloc (cwd_len + 1);
  58       if (getcwd (buf, cwd_len + 1))
  59         {
  60           memcpy (cwd, buf, cwd_len);
  61           err = 0;
  62         }
  63       else
  64         err = errno;
  65       free (buf);
  66     }
  67   else
  68     err = errno;
  69   if (err)
  70     memset (cwd, ' ', cwd_len);
  71   if (status != NULL)
  72     *status = err;
  73 }
  74 iexport(getcwd_i4_sub);
  75
  76 extern void getcwd_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
  77 export_proto(getcwd_i8_sub);
  78
  79 void
  80 getcwd_i8_sub (char *cwd, GFC_INTEGER_8 *status, gfc_charlen_type cwd_len)
  81 {
  82   GFC_INTEGER_4 status4;
  83   getcwd_i4_sub (cwd, &status4, cwd_len);
  84   if (status)
  85     *status = status4;
  86 }
  87
  88 extern GFC_INTEGER_4 PREFIX(getcwd) (char *, gfc_charlen_type);
  89 export_proto_np(PREFIX(getcwd));
  90
  91 GFC_INTEGER_4
  92 PREFIX(getcwd) (char *cwd, gfc_charlen_type cwd_len)
  93 {
  94   GFC_INTEGER_4 status;
  95   getcwd_i4_sub (cwd, &status, cwd_len);
  96   return status;
  97 }
  98
  99 #endif