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-rw-r--r--libc/misc/search/tsearch.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/libc/misc/search/tsearch.c b/libc/misc/search/tsearch.c
index b584e2f15..72abcee7b 100644
--- a/libc/misc/search/tsearch.c
+++ b/libc/misc/search/tsearch.c
@@ -28,6 +28,7 @@ Cambridge, MA 02139, USA. */
*/
/*LINTLIBRARY*/
+#define _GNU_SOURCE
#include <search.h>
#include <stdlib.h>
@@ -187,4 +188,30 @@ void twalk(__const void *vroot, __action_fn_t action)
}
#endif
+#ifdef L_tdestroy
+/* The standardized functions miss an important functionality: the
+ tree cannot be removed easily. We provide a function to do this. */
+static void
+internal_function
+tdestroy_recurse (node *root, __free_fn_t freefct)
+{
+ if (root->left != NULL)
+ tdestroy_recurse (root->left, freefct);
+ if (root->right != NULL)
+ tdestroy_recurse (root->right, freefct);
+ (*freefct) ((void *) root->key);
+ /* Free the node itself. */
+ free (root);
+}
+
+void tdestroy (void *vroot, __free_fn_t freefct)
+{
+ node *root = (node *) vroot;
+ if (root != NULL) {
+ tdestroy_recurse (root, freefct);
+ }
+}
+#endif
+
/* tsearch.c ends here */
+