--- a/src/base/str.c	Sun Sep 01 19:20:08 2019 +0200
+++ b/src/base/str.c	Sun Sep 01 19:20:30 2019 +0200
@@ -171,6 +171,12 @@
     yvec_copy(&src->inner.big, &dst->inner.big);
 }
 
+ystr_t ystr_clone(ystr_t* src) {
+    ystr_t new;
+    ystr_init(&new, ystr_str(src));
+    return new;
+}
+
 #define YSTR_BUILD_BUF_SIZE 128
 
 void ystr_build(ystr_t *s, const char *fmt, ...) {

--- a/src/base/str.h	Sun Sep 01 19:20:08 2019 +0200
+++ b/src/base/str.h	Sun Sep 01 19:20:30 2019 +0200
@@ -30,9 +30,10 @@
 } ystr_t;
 
 /**
- * @brief Create a new string and return it. It must be freed with `ystr_destroy()` after use.
+ * @brief Create a new string and return it. It must be freed with
+ * `ystr_destroy()` after use.
  */
-ystr_t ystr_new(const char* src);
+ystr_t ystr_new(const char *src);
 
 /**
  * @brief Initialize a `ystr_t` with `src`, which can be `NULL`. The string
@@ -76,7 +77,7 @@
 /**
  * @brief Get character at `index`.
  */
-char* ystr_at(ystr_t *s, size_t index);
+char *ystr_at(ystr_t *s, size_t index);
 
 /**
  * @brief Compare to `ystr_t` values. If `s1` is lexically lesser than `s2`, -1
@@ -114,9 +115,15 @@
 void ystr_resize(ystr_t *s, size_t new);
 
 /**
- * @brief Create a copy of `src` in `dst`, potentially freeing dst before copying.
+ * @brief Create a copy of `src` in `dst`, potentially freeing dst before
+ * copying.
  */
-void ystr_copy(ystr_t* src, ystr_t* dst);
+void ystr_copy(ystr_t *src, ystr_t *dst);
+
+/**
+ * @brief Return a cloned copy of `src`.
+ */
+ystr_t ystr_clone(ystr_t *src);
 
 /**
  * @brief Append a C string to string, with possible formatting directives like