diff --git a/deps/libakstdlib b/deps/libakstdlib
index 95e5002..f8425b8 160000
--- a/deps/libakstdlib
+++ b/deps/libakstdlib
@@ -1 +1 @@
-Subproject commit 95e500251260e2ce5984226aa12079969bffd873
+Subproject commit f8425b872909fa2680842cc5d55c355c63bfa7ff
diff --git a/src/game.c b/src/game.c
index 71733c3..331e155 100644
--- a/src/game.c
+++ b/src/game.c
@@ -43,6 +43,20 @@ MIX_Mixer *akgl_mixer = NULL;
 MIX_Track *akgl_tracks[AKGL_GAME_AUDIO_MAX_TRACKS];
 akgl_Game game;
 
+static akerr_ErrorContext *write_exact(const void *ptr, size_t size, size_t nmemb, FILE *fp)
+{
+    size_t transferred;
+
+    return aksl_fwrite(ptr, size, nmemb, fp, &transferred);
+}
+
+static akerr_ErrorContext *read_exact(void *ptr, size_t size, size_t nmemb, FILE *fp)
+{
+    size_t transferred;
+
+    return aksl_fread(ptr, size, nmemb, fp, &transferred);
+}
+
 void akgl_game_lowfps(void)
 {
     SDL_Log("Low FPS! %d", game.fps);
@@ -188,9 +202,9 @@ void akgl_game_save_actorname_iterator(void *userdata, SDL_PropertiesID props, c
     PREPARE_ERROR(e);
     ATTEMPT {
 	FAIL_ZERO_BREAK(e, fp, AKERR_NULLPOINTER, "NULL file pointer");
-	CATCH(e, aksl_fwrite((char *)name, 1, AKGL_ACTOR_MAX_NAME_LENGTH, fp));
+	CATCH(e, write_exact((char *)name, 1, AKGL_ACTOR_MAX_NAME_LENGTH, fp));
 	actor = SDL_GetPointerProperty(props, name, NULL);
-	CATCH(e, aksl_fwrite(&actor, 1, sizeof(akgl_Actor *), fp));
+	CATCH(e, write_exact(&actor, 1, sizeof(akgl_Actor *), fp));
     } CLEANUP {
     } PROCESS(e) {
     } FINISH_NORETURN(e);
@@ -210,8 +224,8 @@ void akgl_game_save_spritename_iterator(void *userdata, SDL_PropertiesID props,
     ATTEMPT {
 	FAIL_ZERO_BREAK(e, fp, AKERR_NULLPOINTER, "NULL file pointer");
 	sprite = SDL_GetPointerProperty(props, name, NULL);
-	CATCH(e, aksl_fwrite((char *)name, 1, AKGL_SPRITE_MAX_NAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite(&sprite, 1, sizeof(akgl_Sprite *), fp));
+	CATCH(e, write_exact((char *)name, 1, AKGL_SPRITE_MAX_NAME_LENGTH, fp));
+	CATCH(e, write_exact(&sprite, 1, sizeof(akgl_Sprite *), fp));
     } CLEANUP {
     } PROCESS(e) {
     } FINISH_NORETURN(e);
@@ -231,8 +245,8 @@ void akgl_game_save_spritesheetname_iterator(void *userdata, SDL_PropertiesID pr
     ATTEMPT {
 	FAIL_ZERO_BREAK(e, fp, AKERR_NULLPOINTER, "NULL file pointer");
 	spritesheet = SDL_GetPointerProperty(props, name, NULL);
-	CATCH(e, aksl_fwrite((char *)name, 1, AKGL_SPRITE_SHEET_MAX_FILENAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite(&spritesheet, 1, sizeof(akgl_SpriteSheet *), fp));
+	CATCH(e, write_exact((char *)name, 1, AKGL_SPRITE_SHEET_MAX_FILENAME_LENGTH, fp));
+	CATCH(e, write_exact(&spritesheet, 1, sizeof(akgl_SpriteSheet *), fp));
     } CLEANUP {
     } PROCESS(e) {
     } FINISH_NORETURN(e);
@@ -252,8 +266,8 @@ void akgl_game_save_charactername_iterator(void *userdata, SDL_PropertiesID prop
     ATTEMPT {
 	FAIL_ZERO_BREAK(e, fp, AKERR_NULLPOINTER, "NULL file pointer");
 	character = SDL_GetPointerProperty(props, name, NULL);
-	CATCH(e, aksl_fwrite((char *)name, 1, AKGL_SPRITE_MAX_CHARACTER_NAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite(&character, 1, sizeof(akgl_Character *), fp));
+	CATCH(e, write_exact((char *)name, 1, AKGL_SPRITE_MAX_CHARACTER_NAME_LENGTH, fp));
+	CATCH(e, write_exact(&character, 1, sizeof(akgl_Character *), fp));
     } CLEANUP {
     } PROCESS(e) {
     } FINISH_NORETURN(e);
@@ -286,29 +300,29 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_game_save_actors(FILE *fp)
 	    AKGL_REGISTRY_ACTOR,
 	    &akgl_game_save_actorname_iterator,
 	    (void *)fp);
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, AKGL_ACTOR_MAX_NAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, sizeof(akgl_Actor *), fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, AKGL_ACTOR_MAX_NAME_LENGTH, fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, sizeof(akgl_Actor *), fp));
 	// write the sprite name pointer table
 	SDL_EnumerateProperties(
 	    AKGL_REGISTRY_SPRITE,
 	    &akgl_game_save_spritename_iterator,
 	    (void *)fp);
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, AKGL_SPRITE_MAX_NAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, sizeof(akgl_Sprite *), fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, AKGL_SPRITE_MAX_NAME_LENGTH, fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, sizeof(akgl_Sprite *), fp));
 	// write the spritesheet name pointer table
 	SDL_EnumerateProperties(
 	    AKGL_REGISTRY_SPRITESHEET,
 	    &akgl_game_save_spritesheetname_iterator,
 	    (void *)fp);
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, AKGL_SPRITE_SHEET_MAX_FILENAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, sizeof(akgl_SpriteSheet *), fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, AKGL_SPRITE_SHEET_MAX_FILENAME_LENGTH, fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, sizeof(akgl_SpriteSheet *), fp));
 	// write the character name pointer table
 	SDL_EnumerateProperties(
 	    AKGL_REGISTRY_CHARACTER,
 	    &akgl_game_save_charactername_iterator,
 	    (void *)fp);
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, AKGL_SPRITE_MAX_CHARACTER_NAME_LENGTH, fp));
-	CATCH(e, aksl_fwrite((void *)&nullbuf, 1, sizeof(akgl_Character *), fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, AKGL_SPRITE_MAX_CHARACTER_NAME_LENGTH, fp));
+	CATCH(e, write_exact((void *)&nullbuf, 1, sizeof(akgl_Character *), fp));
     } CLEANUP {
     } PROCESS(e) {
     } FINISH(e, true);
@@ -323,7 +337,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_game_save(char *fpath)
     ATTEMPT {
 	FAIL_ZERO_BREAK(e, fpath, AKERR_NULLPOINTER, "NULL file path");
 	CATCH(e, aksl_fopen(fpath, "wb", &fp));
-	CATCH(e, aksl_fwrite(&game, 1, sizeof(akgl_Game), fp));
+	CATCH(e, write_exact(&game, 1, sizeof(akgl_Game), fp));
 	CATCH(e, akgl_game_save_actors(fp));
     } CLEANUP {
 	// CLEANUP must precede PROCESS: with the two transposed, the fclose
@@ -363,8 +377,8 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_game_load_objectnamemap(FILE *fp, SDL_Pr
     // corrupt name table as a successful load.
     while ( done == false ) {
 	ATTEMPT {
-	    CATCH(e, aksl_fread((void *)&objname, 1, namelength, fp));
-	    CATCH(e, aksl_fread((void *)&ptr, 1, ptrlength, fp));
+	    CATCH(e, read_exact((void *)&objname, 1, namelength, fp));
+	    CATCH(e, read_exact((void *)&ptr, 1, ptrlength, fp));
 	    // End of the map
 	    if ( ptr == 0x00 && objname[0] == 0x00 ) {
 		done = true;
@@ -456,7 +470,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_game_load(char *fpath)
 
     ATTEMPT {
 	CATCH(e, aksl_fopen(fpath, "rb", &fp));
-	CATCH(e, aksl_fread((void *)&savegame, 1, sizeof(akgl_Game), fp));
+	CATCH(e, read_exact((void *)&savegame, 1, sizeof(akgl_Game), fp));
 	CATCH(e, akgl_game_load_versioncmp("library", (char *)&savegame.libversion, (char *)AKGL_VERSION));
 	CATCH(e, akgl_game_load_versioncmp("game", (char *)&savegame.version, (char *)&game.version));
 	FAIL_NONZERO_RETURN(
diff --git a/src/tilemap.c b/src/tilemap.c
index 380dd1c..888450a 100644
--- a/src/tilemap.c
+++ b/src/tilemap.c
@@ -596,7 +596,7 @@ akerr_ErrorContext *akgl_tilemap_load(char *fname, akgl_Tilemap *dest)
 	//CATCH(errctx, akgl_heap_next_string(&tmpstr));
 	//CATCH(errctx, akgl_string_initialize(tmpstr, NULL));
 	//SDL_snprintf(tmpstr->data, AKGL_MAX_STRING_LENGTH, "%s%s", SDL_GetBasePath(), fname);
-	CATCH(errctx, aksl_realpath(fname, (char *)&dirnamestr->data));
+	CATCH(errctx, aksl_realpath(fname, (char *)&dirnamestr->data, sizeof(dirnamestr->data)));
 	dirname((char *)&dirnamestr->data);
 
 	json = json_load_file(fname, 0, &error);
diff --git a/src/util.c b/src/util.c
index 5b8f3aa..181b57d 100644
--- a/src/util.c
+++ b/src/util.c
@@ -54,9 +54,16 @@ akerr_ErrorContext *akgl_path_relative_root(char *root, char *path, akgl_String
 	    FAIL_RETURN(e, AKERR_OUTOFBOUNDS, "Total path length (%d) is greater than maximum akgl_String length (%d)", (rootlen + pathlen), AKGL_MAX_STRING_LENGTH);
 	}
 	DISABLE_GCC_WARNING_FORMAT_TRUNCATION
-	    CATCH(e, aksl_sprintf(&count, (char *)&pathbuf->data, "%s/%s", root, path));
+	    CATCH(e, aksl_snprintf(
+		      &count,
+		      (char *)&pathbuf->data,
+		      sizeof(pathbuf->data),
+		      "%s/%s",
+		      root,
+		      path
+		      ));
 	RESTORE_GCC_WARNINGS
-	    CATCH(e, aksl_realpath((char *)&pathbuf->data, (char *)&strbuf->data));
+	    CATCH(e, aksl_realpath((char *)&pathbuf->data, (char *)&strbuf->data, sizeof(strbuf->data)));
 	CATCH(e, akgl_string_copy(strbuf, dst, 0));
     } CLEANUP {
 	IGNORE(akgl_heap_release_string(strbuf));
@@ -80,7 +87,7 @@ akerr_ErrorContext *akgl_path_relative(char *root, char *path, akgl_String *dst)
 
     ATTEMPT {
 	// Is path relative to our current working directory?
-	CATCH(e, aksl_realpath(path, (char *)&strbuf->data));
+	CATCH(e, aksl_realpath(path, (char *)&strbuf->data, sizeof(strbuf->data)));
 	// Yes it is. strbuf->data contains the absolute path.
 	CATCH(e, akgl_string_copy(strbuf, dst, 0));
     } CLEANUP {
@@ -109,7 +116,7 @@ akerr_ErrorContext *akgl_path_relative_from(char *path, char *from, akgl_String
     FAIL_ZERO_RETURN(e, path, AKERR_NULLPOINTER, "path");
     FAIL_ZERO_RETURN(e, from, AKERR_NULLPOINTER, "from");
     PASS(e, akgl_heap_next_string(&dirnamestr));
-    PASS(e, aksl_realpath(from, (char *)&dirnamestr->data));
+    PASS(e, aksl_realpath(from, (char *)&dirnamestr->data, sizeof(dirnamestr->data)));
     dirname((char *)&dirnamestr->data);
 
     SUCCEED_RETURN(e);