diff --git a/.gitignore b/.gitignore
index 2d45464..6d67000 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 # Visual studio stuff
 .vs/
 
+# ctags
+tags
+
 # Clion stuff
 .idea/
 cmake-build-debug/
diff --git a/codegen.c b/codegen.c
index 55dd387..e8f92b0 100644
--- a/codegen.c
+++ b/codegen.c
@@ -6,9 +6,17 @@
 
 #pragma warning(disable : 4996) // nonsense about fopen being insecure
 
+#if defined(__clang__)
+#define no_ubsan __attribute__((no_sanitize("undefined")))
+#else
+#define no_ubsan 
+#endif
+
 #pragma warning(push)
 #pragma warning(disable : 4244) // loss of data warning
 #pragma warning(disable : 4101) // unreferenced local variable
+#define STBSP_ADD_TO_FUNCTIONS no_ubsan
+#define MD_FUNCTION no_ubsan
 #include "md.h"
 #include "md.c"
 #pragma warning(pop)
@@ -51,7 +59,7 @@ MD_String8 asset_file_path(MD_String8 filename) {
 }
 
 char *nullterm(MD_String8 s) {
-	char *to_return = malloc(s.size + 1);
+	char *to_return = MD_ArenaPush(cg_arena, s.size + 1);
 	memcpy(to_return, s.str, s.size);
 	to_return[s.size] = '\0';
 	return to_return;
@@ -154,7 +162,7 @@ int main(int argc, char **argv)
 			MD_String8 filepath = ChildValue(node, MD_S8Lit("filepath"));
 			filepath = asset_file_path(filepath);
 			assert(filepath.str != 0); // MD_S8Fmt(cg_arena, "No filepath specified for sound '%.*s'", MD_S8VArg(node->string)));
-			FILE *asset_file = fopen(filepath.str, "r");
+			FILE *asset_file = fopen(nullterm(filepath), "r");
 			assert(asset_file); //  MD_S8Fmt(cg_arena, "Could not open filepath %.*s for asset '%.*s'", MD_S8VArg(filepath), MD_S8VArg(node->string)));
 			fclose(asset_file);
 
@@ -167,7 +175,7 @@ int main(int argc, char **argv)
 			MD_String8 filepath = ChildValue(node, MD_S8Lit("filepath"));
 			filepath = asset_file_path(filepath);
 			assert(filepath.str != 0); // , MD_S8Fmt(cg_arena, "No filepath specified for image '%.*s'", MD_S8VArg(node->string)));
-			FILE *asset_file = fopen(filepath.str, "r");
+			FILE *asset_file = fopen(nullterm(filepath), "r");
 			assert(asset_file); // , MD_S8Fmt(cg_arena, "Could not open filepath %.*s for asset '%.*s'", MD_S8VArg(filepath), MD_S8VArg(node->string)));
 			fclose(asset_file);
 
diff --git a/run_codegen.bat b/run_codegen.bat
index f7672d6..211bf6d 100644
--- a/run_codegen.bat
+++ b/run_codegen.bat
@@ -36,7 +36,7 @@ thirdparty\sokol-shdc.exe --input quad.glsl --output gen\quad-sapp.glsl.h --slan
 
 @REM metadesk codegen
 @REM cl /Ithirdparty /W3 /Zi /WX codegen.c || goto :error
-zig -Ithirdparty -gfull -gcodeview codegen.c -o codegen.exe || goto error
+zig cc -Ithirdparty -gfull -gcodeview codegen.c -o codegen.exe || goto error
 codegen || goto :error
 
 @REM cl /Ithirdparty /Igen /W3 /Zi /WX maketraining.c || goto :error
diff --git a/thirdparty/md_stb_sprintf.h b/thirdparty/md_stb_sprintf.h
index c5b5fcc..1567671 100644
--- a/thirdparty/md_stb_sprintf.h
+++ b/thirdparty/md_stb_sprintf.h
@@ -165,19 +165,26 @@ PERFORMANCE vs MSVC 2008 32-/64-bit (GCC is even slower than MSVC):
 #define STBSP__ASAN
 #endif
 
+
 #ifdef STB_SPRINTF_STATIC
 #define STBSP__PUBLICDEC static
-#define STBSP__PUBLICDEF static STBSP__ASAN
+#define STBSP__NEW_PUBLICDEF static STBSP__ASAN
 #else
 #ifdef __cplusplus
 #define STBSP__PUBLICDEC extern "C"
-#define STBSP__PUBLICDEF extern "C" STBSP__ASAN
+#define STBSP__NEW_PUBLICDEF extern "C" STBSP__ASAN
 #else
 #define STBSP__PUBLICDEC extern
-#define STBSP__PUBLICDEF STBSP__ASAN
+#define STBSP__NEW_PUBLICDEF STBSP__ASAN
+#endif
 #endif
+
+#ifndef STBSP_ADD_TO_FUNCTIONS
+#define STBSP_ADD_TO_FUNCTIONS
 #endif
 
+#define STBSP__PUBLICDEF STBSP_ADD_TO_FUNCTIONS STBSP__NEW_PUBLICDEF
+
 #include <stdarg.h> // for va_list()
 #include <stddef.h> // size_t, ptrdiff_t
 
diff --git a/thirdparty/stb_ds.h b/thirdparty/stb_ds.h
index 974d080..0776002 100644
--- a/thirdparty/stb_ds.h
+++ b/thirdparty/stb_ds.h
@@ -1114,12 +1114,12 @@ static size_t stbds_siphash_bytes(void *p, size_t len, size_t seed)
 }
 
 #if defined(__clang__)
-#define no_ubsan_overflow __attribute__((no_sanitize("undefined")))
+#define no_ubsan __attribute__((no_sanitize("undefined")))
 #else
-#define no_ubsan_overflow 
+#define no_ubsan 
 #endif
 
-size_t no_ubsan_overflow stbds_hash_bytes(void *p, size_t len, size_t seed)
+size_t no_ubsan stbds_hash_bytes(void *p, size_t len, size_t seed)
 {
 #ifdef STBDS_SIPHASH_2_4
   return stbds_siphash_bytes(p,len,seed);