From ff77a89b252ad79cd005afe361c4b5860c3e7c3a Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sun, 26 Dec 2021 11:58:23 -0600
Subject: implement lily_assert_msg

---
 lily-test.c  | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 lily-test.h  |  1 +
 tests/main.c |  2 ++
 3 files changed, 51 insertions(+)

diff --git a/lily-test.c b/lily-test.c
index a3f30a2..69bd0ce 100644
--- a/lily-test.c
+++ b/lily-test.c
@@ -1,8 +1,56 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include "lily-test.h"
 
 struct lily_globals_t _lily_globals;
 
+
+void lily_init()
+{
+   _lily_globals.error_msg = NULL;
+   _lily_globals.error_location = "";
+}
+
+
+static void _lily_assert_msg(bool statement, const char *location,
+			     const char *format_string, va_list args)
+{
+   if (statement) {
+      va_end(args);
+      return; // no error, return
+   }
+
+   _lily_globals.error_location = location;
+
+   va_list args_len;
+   va_copy(args_len, args);
+   size_t length = vsnprintf(NULL, 0, format_string, args_len);
+   va_end(args_len);
+
+   char *msg = realloc(_lily_globals.error_msg, (length+1) * sizeof(char));
+   if (msg == NULL) {
+      fprintf(stderr, "WARNING: failed to allocate memory for failed test message!\n");
+      if (_lily_globals.error_msg != NULL) {
+	 free(_lily_globals.error_msg);
+	 _lily_globals.error_msg = NULL;
+      }
+   }
+   else {
+      vsnprintf(msg, length+1, format_string, args);
+      _lily_globals.error_msg = msg;
+   }
+
+   va_end(args);
+   longjmp(_lily_globals.env, 1);
+}
+
+
 void lily_assert_msg(bool statement, const char *location,
 		     const char *format_string, ...)
 {
+   va_list args;
+   va_start(args, format_string);
+   // _lily_assert_msg may long jump, so it takes calls va_end(args) for you
+   _lily_assert_msg(statement, location, format_string, args);
 }
diff --git a/lily-test.h b/lily-test.h
index ee37ed5..01eb34a 100644
--- a/lily-test.h
+++ b/lily-test.h
@@ -23,6 +23,7 @@ struct lily_globals_t {
 };
 
 extern struct lily_globals_t _lily_globals;
+void lily_init();
 
 void lily_assert_msg(bool statement, const char *location,
 		     const char *format_string, ...);
diff --git a/tests/main.c b/tests/main.c
index dbb813c..0ac74ac 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -8,6 +8,8 @@
 
 int main()
 {
+   lily_init();
+   
    run_test(test_LILY_LOCATION);
    run_test(test_assert_msg);
    
-- 
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