eina: add eina_slstr_copy_new_length.

Reviewers: SanghyeonLee, bu5hm4n, zmike, segfaultxavi, lauromoura, felipealmeida, raster

Reviewed By: bu5hm4n, zmike

Subscribers: #reviewers, #committers

Tags: #efl

Maniphest Tasks: T7832

Differential Revision: https://phab.enlightenment.org/D8800

src/lib/eina/eina_slstr.c

@@ -108,6 +108,23 @@ eina_slstr_copy_new(const char *string)
    return copy;
 }
 
+EAPI Eina_Slstr *
+eina_slstr_copy_new_length(const char *string, size_t len)
+{
+   Eina_FreeQ *fq;
+   char *copy;
+
+   if (!string) return NULL;
+
+   fq = _slstr_freeq_get(EINA_FALSE);
+   EINA_SAFETY_ON_NULL_RETURN_VAL(fq, NULL);
+
+   copy = eina_strndup(string, len);
+   if (!copy) return NULL;
+   eina_freeq_ptr_add(fq, copy, free, len);
+   return copy;
+}
+
 EAPI Eina_Slstr *
 eina_slstr_steal_new(char *string)
 {

src/lib/eina/eina_slstr.h

@@ -51,6 +51,25 @@ typedef const char Eina_Slstr;
 EAPI Eina_Slstr *
 eina_slstr_copy_new(const char *string);
 
+/**
+ * @brief Create a new short lived string by duplicating another string.
+ *
+ * @param[in] string An existing string, it will be copied.
+ * @param[in] len How many charactere max to copy.
+ * @return A new Eina_Slstr or NULL if out of memory.
+ *
+ * Usage example:
+ * @code
+ * char local[200];
+ * sprintf(local, "Hello %d", value);
+ * return eina_slstr_copy_new_length(local, 5);
+ * @endcode
+ *
+ * @since 1.19
+ */
+EAPI Eina_Slstr *
+eina_slstr_copy_new_length(const char *string, size_t len);
+
 /**
  * @brief Create a new short lived string by taking ownership of a string.
  *