raw import of cvs-1.6

1 files changed, 79 insertions, 0 deletions

diff --git a/gnu/usr.bin/cvs/lib/xgetwd.c b/gnu/usr.bin/cvs/lib/xgetwd.c
new file mode 100644
index 00000000000..8fe4ec18c2e
--- /dev/null
+++ b/gnu/usr.bin/cvs/lib/xgetwd.c
@@ -0,0 +1,79 @@
+/* xgetwd.c -- return current directory with unlimited length
+   Copyright (C) 1992 Free Software Foundation, Inc.
+
+   This program 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 2, or (at your option)
+   any later version.
+
+   This program 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.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/* Derived from xgetcwd.c in e.g. the GNU sh-utils.  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "system.h"
+
+#include <stdio.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+#include <sys/types.h>
+
+#ifndef HAVE_GETWD
+char *getwd ();
+#define GETWD(buf, max) getwd (buf)
+#else
+char *getcwd ();
+#define GETWD(buf, max) getcwd (buf, max)
+#endif
+
+/* Amount by which to increase buffer size when allocating more space. */
+#define PATH_INCR 32
+
+char *xmalloc ();
+char *xrealloc ();
+
+/* Return the current directory, newly allocated, arbitrarily long.
+   Return NULL and set errno on error. */
+
+char *
+xgetwd ()
+{
+  char *cwd;
+  char *ret;
+  unsigned path_max;
+
+  errno = 0;
+  path_max = (unsigned) PATH_MAX;
+  path_max += 2;		/* The getcwd docs say to do this. */
+
+  cwd = xmalloc (path_max);
+
+  errno = 0;
+  while ((ret = GETWD (cwd, path_max)) == NULL && errno == ERANGE)
+    {
+      path_max += PATH_INCR;
+      cwd = xrealloc (cwd, path_max);
+      errno = 0;
+    }
+
+  if (ret == NULL)
+    {
+      int save_errno = errno;
+      free (cwd);
+      errno = save_errno;
+      return NULL;
+    }
+  return cwd;
+}