1 files changed, 46 insertions, 0 deletions
diff --git a/src/require.h b/src/require.h
new file mode 100644
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--- /dev/null
+++ b/src/require.h
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+/* require.h -- useful error-handling macros
+ * Copyright (C) 2013  Galois, Inc.
+ *
+ * This library 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.
+ *
+ * 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * To contact Galois, complete the Web form at
+ * <http://corp.galois.com/contact/> or write to Galois, Inc., 421 Southwest
+ * 6th Avenue, Suite 300, Portland, Oregon, 97204-1622. */
+
+#ifndef REQUIRE_H
+#define REQUIRE_H
+
+#ifdef HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#define require_not(var, val, ret_val)		\
+	do {                                    \
+		if ((var) != val) {		\
+			r = ret_val;            \
+			goto done;              \
+		}                               \
+	} while (0)
+#define require_zero(var, ret_val) require_not(var, 0, ret_val)
+#define require_one(var, ret_val) require_not(var, 1, ret_val)
+
+#define require_nonnull(ptr, ret_val)           \
+	do {                                    \
+		if ((ptr) == NULL) {            \
+			r = ret_val;            \
+			goto done;              \
+		}                               \
+	} while (0)
+
+#endif