1 files changed, 137 insertions, 0 deletions
diff --git a/lib/savedir.c b/lib/savedir.c
new file mode 100644
index 0000000..d930fb4
--- /dev/null
+++ b/lib/savedir.c
@@ -0,0 +1,137 @@
+/* savedir.c -- save the list of files in a directory in a string
+
+   Copyright (C) 1990, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
+   2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
+
+#include <config.h>
+
+#include "savedir.h"
+
+#include <sys/types.h>
+
+#include <errno.h>
+
+#include <dirent.h>
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dp)	strlen ((dp)->d_name)
+#endif
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "openat.h"
+#include "xalloc.h"
+
+#ifndef NAME_SIZE_DEFAULT
+# define NAME_SIZE_DEFAULT 512
+#endif
+
+/* The results of opendir() in this file are not used with dirfd and fchdir,
+   therefore save some unnecessary work in fchdir.c.  */
+#undef opendir
+#undef closedir
+
+/* Return a freshly allocated string containing the file names
+   in directory DIRP, separated by '\0' characters;
+   the end is marked by two '\0' characters in a row.
+   Return NULL (setting errno) if DIRP cannot be read or closed.
+   If DIRP is NULL, return NULL without affecting errno.  */
+
+static char *
+savedirstream (DIR *dirp)
+{
+  char *name_space;
+  size_t allocated = NAME_SIZE_DEFAULT;
+  size_t used = 0;
+  int save_errno;
+
+  if (dirp == NULL)
+    return NULL;
+
+  name_space = xmalloc (allocated);
+
+  for (;;)
+    {
+      struct dirent const *dp;
+      char const *entry;
+
+      errno = 0;
+      dp = readdir (dirp);
+      if (! dp)
+	break;
+
+      /* Skip "", ".", and "..".  "" is returned by at least one buggy
+         implementation: Solaris 2.4 readdir on NFS file systems.  */
+      entry = dp->d_name;
+      if (entry[entry[0] != '.' ? 0 : entry[1] != '.' ? 1 : 2] != '\0')
+	{
+	  size_t entry_size = _D_EXACT_NAMLEN (dp) + 1;
+	  if (used + entry_size < used)
+	    xalloc_die ();
+	  if (allocated <= used + entry_size)
+	    {
+	      do
+		{
+		  if (2 * allocated < allocated)
+		    xalloc_die ();
+		  allocated *= 2;
+		}
+	      while (allocated <= used + entry_size);
+
+	      name_space = xrealloc (name_space, allocated);
+	    }
+	  memcpy (name_space + used, entry, entry_size);
+	  used += entry_size;
+	}
+    }
+  name_space[used] = '\0';
+  save_errno = errno;
+  if (closedir (dirp) != 0)
+    save_errno = errno;
+  if (save_errno != 0)
+    {
+      free (name_space);
+      errno = save_errno;
+      return NULL;
+    }
+  return name_space;
+}
+
+/* Return a freshly allocated string containing the file names
+   in directory DIR, separated by '\0' characters;
+   the end is marked by two '\0' characters in a row.
+   Return NULL (setting errno) if DIR cannot be opened, read, or closed.  */
+
+char *
+savedir (char const *dir)
+{
+  return savedirstream (opendir (dir));
+}
+
+/* Return a freshly allocated string containing the file names
+   in directory FD, separated by '\0' characters;
+   the end is marked by two '\0' characters in a row.
+   Return NULL (setting errno) if FD cannot be read or closed.  */
+
+char *
+fdsavedir (int fd)
+{
+  return savedirstream (fdopendir (fd));
+}