diff --git a/include/gargoyle/delusion.h b/include/gargoyle/delusion.h
index 4f61508..cdfa744 100644
--- a/include/gargoyle/delusion.h
+++ b/include/gargoyle/delusion.h
@@ -15,5 +15,10 @@ struct gargoyle_err {
 };
 
 void gargoyle_emit_err(struct gargoyle_err *err);
+void gargoyle_fill_err(struct gargoyle_err *err, gargoyle_err_type code, int errno_code, const char *func, const char *errno_func, const char *fmt, ...);
+
+#define GARGOYLE_NEW_ERR(err) gargoyle_fill_err(err, 0, 0, __func__, NULL, "")
+#define GARGOYLE_MK_ERR(err, code, fmt, ...) gargoyle_fill_err(err, code, 0, __func__, NULL, fmt, __VA_ARGS__)
+#define GARGOYLE_SYS_ERR(err, code, errno_code, errno_func, fmt, ...) gargoyle_fill_err(err, code, errno_code, __func__, errno_func, fmt, __VA_ARGS__)
 
 #endif
diff --git a/src/delusion.c b/src/delusion.c
index abe96e6..7c48eef 100644
--- a/src/delusion.c
+++ b/src/delusion.c
@@ -1,5 +1,6 @@
 #include <gargoyle/delusion.h>
-
+#include <gargoyle/twine.h>
+#include <stdarg.h>
 #include <stdio.h>
 
 void gargoyle_emit_err(struct gargoyle_err *err) {
@@ -11,3 +12,24 @@ void gargoyle_emit_err(struct gargoyle_err *err) {
 
   fprintf(stderr, "%s\n", err->msg);
 }
+
+void gargoyle_fill_err(struct gargoyle_err *err, gargoyle_err_type code, int errno_code, const char *func, const char *errno_func, const char *fmt, ...) {
+  err->code = code;
+  err->errno = errno_code;
+
+
+  if(func) {
+    gargoyle_cpy(err->func, func, GARGOYLE_MAX_FUNC_SZ, GARGOYLE_FLG_FILL0);
+  }
+
+  if(errno_func) {
+    gargoyle_cpy(err->errno_func, errno_func, GARGOYLE_MAX_FUNC_SZ, GARGOYLE_FLG_FILL0);
+  }
+
+  if(fmt) {
+    va_list args;
+    va_start(args, fmt);
+    vsnprintf(err->msg, GARGOYLE_MAX_ERR_SZ, fmt, args);
+    va_end(args);
+  }
+}