X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/agedu/blobdiff_plain/09fd761910218169867abf96b15d3cc1bc36e379..522edd92f2bbef89ccd1dd0a3e874516fb47e2ef:/trie.c

diff --git a/trie.c b/trie.c
index 51fba3e..345756f 100644
--- a/trie.c
+++ b/trie.c
@@ -628,6 +628,19 @@ triewalk *triewalk_new(const void *vt)
 
     return tw;
 }
+
+void triewalk_rebase(triewalk *tw, const void *t)
+{
+    ptrdiff_t diff = ((const unsigned char *)t - (const unsigned char *)(tw->t));
+    int i;
+
+    tw->t = t;
+
+    for (i = 0; i < tw->nswitches; i++)
+	tw->switches[i].sw = (const struct trie_switch *)
+	    ((const unsigned char *)(tw->switches[i].sw) + diff);
+}
+
 const struct trie_file *triewalk_next(triewalk *tw, char *buf)
 {
     off_t off;