Extract keyfile helpers into libotutil

Will be used by ostree-pull too soon.

src/libotutil/ot-keyfile-utils.c

@@ -0,0 +1,93 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2011 Colin Walters <walters@verbum.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Colin Walters <walters@verbum.org>
+ */
+
+#include "config.h"
+
+#include "otutil.h"
+
+#include <string.h>
+
+gboolean
+ot_keyfile_get_boolean_with_default (GKeyFile      *keyfile,
+                                     const char    *section,
+                                     const char    *value,
+                                     gboolean       default_value,
+                                     gboolean      *out_bool,
+                                     GError       **error)
+{
+  gboolean ret = FALSE;
+  GError *temp_error = NULL;
+  gboolean ret_bool;
+
+  ret_bool = g_key_file_get_boolean (keyfile, section, value, &temp_error);
+  if (temp_error)
+    {
+      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
+        {
+          g_clear_error (&temp_error);
+          ret_bool = default_value;
+        }
+      else
+        {
+          g_propagate_error (error, temp_error);
+          goto out;
+        }
+    }
+
+  ret = TRUE;
+  *out_bool = ret_bool;
+ out:
+  return ret;
+}
+
+gboolean
+ot_keyfile_get_value_with_default (GKeyFile      *keyfile,
+                                   const char    *section,
+                                   const char    *value,
+                                   const char    *default_value,
+                                   char         **out_value,
+                                   GError       **error)
+{
+  gboolean ret = FALSE;
+  GError *temp_error = NULL;
+  ot_lfree char *ret_value;
+
+  ret_value = g_key_file_get_value (keyfile, section, value, &temp_error);
+  if (temp_error)
+    {
+      if (g_error_matches (temp_error, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
+        {
+          g_clear_error (&temp_error);
+          ret_value = g_strdup (default_value);
+        }
+      else
+        {
+          g_propagate_error (error, temp_error);
+          goto out;
+        }
+    }
+
+  ret = TRUE;
+  ot_transfer_out_value(out_value, &ret_value);
+ out:
+  return ret;
+}