eina_strbuf: add eina_strbuf_free_return

Summary:
For a function which just composes a string with strbuf its quite
usefull to return the string while its freed.

This makes a function like:

{
   Eina_Strbuf *buf;
   char *path;

   buf = eina_strbuf_new();
   eina_strbuf_append(buf, "test");
   eina_strbuf_append_printf(buf, "%s-%d.edj", "test", 0);
   path = eina_strbuf_string_steal(buf);
   eina_strbuf_free(buf);
   return path;
}

To:

{
   Eina_Strbuf *buf;

   buf = eina_strbuf_new();
   eina_strbuf_append(buf, "test");
   eina_strbuf_append_printf(buf, "%s-%d.edj", "test", 0);
   return eina_strbuf_free_return(buf);
}

Which is a bit more handy.

Test Plan: just run make check

Reviewers: raster, cedric

Subscribers: jpeg

Differential Revision: https://phab.enlightenment.org/D4545

src/lib/eina/eina_strbuf.c

@@ -220,6 +220,17 @@ eina_strbuf_substr_get(Eina_Strbuf *buf, size_t pos, size_t len)
    return eina_strbuf_manage_new(str);
 }
 
+EAPI char*
+eina_strbuf_free_return(Eina_Strbuf *buf)
+{
+   char *result;
+
+   result = eina_strbuf_string_steal(buf);
+   eina_strbuf_free(buf);
+
+   return result;
+}
+
 /* Unicode */
 
 #include "eina_strbuf_template_c.x"

src/lib/eina/eina_strbuf.h

@@ -718,6 +718,19 @@ EAPI Eina_Slice eina_strbuf_slice_get(const Eina_Strbuf *buf) EINA_WARN_UNUSED_R
  */
 EAPI Eina_Rw_Slice eina_strbuf_rw_slice_get(const Eina_Strbuf *buf) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);
 
+
+/**
+ * @brief Get the string of the buffer and free the buffer
+ *
+ * @param buf the buffer to get the string from and which will be freed
+ *
+ * @return The string contained by bug. The caller must release the memory of the returned string by calling
+ * free().
+ *
+ * @since 1.19
+ */
+EAPI char* eina_strbuf_free_return(Eina_Strbuf *buf) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);
+
 /**
  * @}
  */

src/tests/eina/eina_test_strbuf.c

@@ -646,6 +646,20 @@ START_TEST(strbuf_prepend_print)
 }
 END_TEST
 
+START_TEST(strbuf_free_return_test)
+{
+   Eina_Strbuf *buf;
+   char *string;
+
+   buf = eina_strbuf_new();
+   ck_assert_ptr_ne(buf, NULL);
+   eina_strbuf_append(buf, "strbuf_free_return_test");
+
+   string = eina_strbuf_free_return(buf);
+   ck_assert_str_eq(string, "strbuf_free_return_test");
+}
+END_TEST
+
 void
 eina_test_strbuf(TCase *tc)
 {
@@ -662,4 +676,5 @@ eina_test_strbuf(TCase *tc)
    tcase_add_test(tc, strbuf_tolower);
    tcase_add_test(tc, strbuf_substr_get);
    tcase_add_test(tc, strbuf_prepend_print);
+   tcase_add_test(tc, strbuf_free_return_test);
 }