29 files changed, 1185 insertions, 0 deletions

diff --git a/src/util/check_error.h b/src/util/check_error.h
new file mode 100644
index 0000000..7aa6495
--- a/dev/null
+++ b/src/util/check_error.h
@@ -0,0 +1,9 @@
+#ifndef CHECK_ERROR_H
+#define CHECK_ERROR_H
+
+/*
+ * Based on example 14-1 in Shreiner p603.
+ */
+void check_error (const char *filename, unsigned int linenum);
+
+#endif // CHECK_ERROR_H