1 files changed, 137 insertions, 0 deletions
diff --git a/libidu/idfile.c b/libidu/idfile.c
new file mode 100644
index 0000000..e377145
--- /dev/null
+++ b/libidu/idfile.c
@@ -0,0 +1,137 @@
+/* idfile.c -- read & write mkid database file header
+   Copyright (C) 1986, 1995, 1996 Free Software Foundation, Inc.
+   Written by Greg McGary <gkm@gnu.ai.mit.edu>
+
+   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include <config.h>
+#include <stdio.h>
+#include <errno.h>
+#include "xstdlib.h"
+#include "xstring.h"
+#include "xsysstat.h"
+#include "xnls.h"
+#include "xobstack.h"
+#include "idfile.h"
+#include "error.h"
+
+int io_size __P((FILE *, void *, unsigned int size, int));
+
+
+/****************************************************************************/
+
+/* Discover the name of the ID file.  If ARG is NULL, consult $IDPATH.
+   If $IDPATH is undefined, default to "ID".  If the candidate file
+   name is relative, search successive ancestor directories until the
+   file is found or we reach the root.  If we find it, return the
+   relative file name, otherwise return NULL.  */
+
+char const *
+locate_id_file_name (char const *arg)
+{
+  static char file_name_buffer[BUFSIZ];
+  char *buf = file_name_buffer;
+  char *id_path = 0;
+  struct stat rootb;
+  struct stat statb;
+
+  if (arg == 0)
+    {
+      id_path = getenv ("IDPATH");
+      if (id_path)
+	{
+	  id_path = strdup (id_path);
+	  arg = strtok (id_path, ":");
+	  /* FIXME: handle multiple ID file names */
+	}
+    }
+  if (arg == 0)
+    arg = DEFAULT_ID_FILE_NAME;
+
+  /* if we got absolute name, just use it. */
+  if (arg[0] == '/')
+    return arg;
+  /* if the name we were give exists, don't bother searching */
+  if (stat (arg, &statb) == 0)
+    return arg;
+  /* search up the tree until we find a directory where this
+	 * relative file name is visible.
+	 * (or we run out of tree to search by hitting root).
+	 */
+
+  if (stat ("/", &rootb) != 0)
+    return NULL;
+  do
+    {
+      strcpy (buf, "../");
+      buf += 3;
+      strcpy (buf, arg);
+      if (stat (file_name_buffer, &statb) == 0)
+	return file_name_buffer;
+      *buf = '\0';
+      if (stat (file_name_buffer, &statb) != 0)
+	return NULL;
+    }
+  while (!((statb.st_ino == rootb.st_ino) ||
+	   (statb.st_dev == rootb.st_dev)));
+  return NULL;
+}
+
+
+/****************************************************************************/
+
+int
+sizeof_idhead ()
+{
+  return io_idhead (0, io_size, 0);
+}
+
+int
+io_size (FILE *ignore_FILE, void *ignore_addr, unsigned int size, int io_type)
+{
+  if (io_type == IO_TYPE_STR)
+    error (0, 0, _("can't determine the io_size of a string!"));
+  return size;
+}
+
+/* The sizes of the fields must be hard-coded.  They aren't
+   necessarily the sizes of the struct members, because some
+   architectures don't have any way to declare 4-byte integers
+   (e.g., Cray) */
+
+int
+io_idhead (FILE *fp, io_func_t iof, struct idhead *idhp)
+{
+  unsigned int size = 0;
+  unsigned char pad = 0;
+  if (fp)
+    fseek (fp, 0L, 0);
+  size += iof (fp, idhp->idh_magic, 2, IO_TYPE_FIX);
+  size += iof (fp, &pad, 1, IO_TYPE_FIX);
+  size += iof (fp, &idhp->idh_version, 1, IO_TYPE_FIX);
+  size += iof (fp, &idhp->idh_flags, 2, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_file_links, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_files, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_tokens, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_buf_size, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_vec_size, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_tokens_offset, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_flinks_offset, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_end_offset, 4, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_max_link, 2, IO_TYPE_INT);
+  size += iof (fp, &idhp->idh_max_path, 2, IO_TYPE_INT);
+  return size;
+}