1 files changed, 98 insertions, 0 deletions
diff --git a/libgfortran/intrinsics/getcwd.c b/libgfortran/intrinsics/getcwd.c
new file mode 100644
index 0000000000..a78d5084fb
--- /dev/null
+++ b/libgfortran/intrinsics/getcwd.c
@@ -0,0 +1,98 @@
+/* Implementation of the GETCWD intrinsic.
+   Copyright (C) 2004-2017 Free Software Foundation, Inc.
+   Contributed by Steven G. Kargl <kargls@comcast.net>.
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+Libgfortran is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+
+#include <string.h>
+#include <errno.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_GETCWD
+
+extern void getcwd_i4_sub (char *, GFC_INTEGER_4 *, gfc_charlen_type);
+iexport_proto(getcwd_i4_sub);
+
+void
+getcwd_i4_sub (char *cwd, GFC_INTEGER_4 *status, gfc_charlen_type cwd_len)
+{
+  int err;
+
+  if (getcwd (cwd, cwd_len))
+    {
+      size_t len = strlen (cwd);
+      memset (cwd + len, ' ', cwd_len - len);
+      err = 0;
+    }
+  else if (errno == ERANGE)
+    {
+      /* There is a possibility that the previous attempt failed due
+	 to not enough space for the terminating null byte. Try again
+	 with a buffer one char longer.  */
+      char *buf = xmalloc (cwd_len + 1);
+      if (getcwd (buf, cwd_len + 1))
+	{
+	  memcpy (cwd, buf, cwd_len);
+	  err = 0;
+	}
+      else
+	err = errno;
+      free (buf);
+    }
+  else
+    err = errno;
+  if (err)
+    memset (cwd, ' ', cwd_len);
+  if (status != NULL)
+    *status = err;
+}
+iexport(getcwd_i4_sub);
+
+extern void getcwd_i8_sub (char *, GFC_INTEGER_8 *, gfc_charlen_type);
+export_proto(getcwd_i8_sub);
+
+void
+getcwd_i8_sub (char *cwd, GFC_INTEGER_8 *status, gfc_charlen_type cwd_len)
+{
+  GFC_INTEGER_4 status4;
+  getcwd_i4_sub (cwd, &status4, cwd_len);
+  if (status)
+    *status = status4;
+}
+
+extern GFC_INTEGER_4 PREFIX(getcwd) (char *, gfc_charlen_type);
+export_proto_np(PREFIX(getcwd));
+
+GFC_INTEGER_4
+PREFIX(getcwd) (char *cwd, gfc_charlen_type cwd_len)
+{
+  GFC_INTEGER_4 status;
+  getcwd_i4_sub (cwd, &status, cwd_len);
+  return status;
+}
+
+#endif