Add static, runtime and debug assert utilities

src/common/assert/assert.h

@@ -0,0 +1,27 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "../aliases/aliases.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#define wapp_static_assert(EXPR, MSG) extern char ASSERTION_FAILED[EXPR ? 1 : -1]
+#define wapp_runtime_assert(EXPR, MSG) __wapp_runtime_assert(EXPR, MSG)
+
+#ifdef WAPP_DEBUG_ASSERT
+  #define wapp_debug_assert(EXPR, MSG) wapp_runtime_assert(EXPR, MSG)
+#else
+  #define wapp_debug_assert(EXPR, MSG)
+#endif
+
+#define __wapp_runtime_assert(EXPR, MSG) do {                                         \
+  if (!(EXPR)) {                                                                      \
+    fprintf(                                                                          \
+      stderr,                                                                         \
+      "%s:%d (In function `%s`): Assertion failed (%" PRIu32 ")\nDiagnostic: %s\n\n", \
+      __FILE__, __LINE__, __func__,                                                   \
+      EXPR, MSG                                                                       \
+    );                                                                                \
+    abort();                                                                          \
+  }                                                                                   \
+} while(false)