1 files changed, 9 insertions, 0 deletions
diff --git a/util.h b/util.h
index 501d11e..052a106 100644
--- a/util.h
+++ b/util.h
@@ -2,5 +2,14 @@
 #define min(a, b) ((a < b) ? a : b)
 #define max(a, b) ((a > b) ? a : b)
 
+#define expect(x) do {                                               \
+    if (!(x)) {                                                      \
+      fprintf(stderr, "Fatal error: %s:%d: assertion '%s' failed\n", \
+        __FILE__, __LINE__, #x);                                     \
+      abort();                                                       \
+    }                                                                \
+  } while (0)
+
+
 void free_arr(void **arr, int n);
 int lsearch(const void *key, const void *base, size_t n, size_t size, int (*cmp)(const void *keyval, const void *datum));