struct: tree node children now purely linked list instead of bespoke hybrid

1 files changed, 14 insertions, 18 deletions

diff --git a/sys/libbio/phylo.c b/sys/libbio/phylo.c
index d623712..2bff92d 100644
--- a/sys/libbio/phylo.c
+++ b/sys/libbio/phylo.c
@@ -9,23 +9,19 @@ error
 phylo·addchild(bio·Node* parent, bio·Node* child)
 {
     bio·Node *it, *sibling;
-    switch (parent->nchild) {
-    case 1:
-        parent->child[0]->sibling = child;
-    case 0:
-        parent->child[parent->nchild++] = child;
-    break;
-
-    default:
-        sibling = parent->child[1];
-        for (it = parent->child[1]->sibling; it != nil; it = it->sibling) {
-            sibling = it;
-        }
-        sibling->sibling = child;
-        parent->nchild++;
+    if (!parent->nchild) {
+        parent->child = child;
+        goto SUCCESS;
+    }
+
+    for (it = parent->child, sibling = it; it != nil; it = it->sibling) {
+        sibling = it;
     }
+    sibling->sibling = child;
 
+SUCCESS:
     child->parent = parent;
+    parent->nchild++;
     return 0;
 }
 
@@ -39,7 +35,7 @@ phylo·rmchild(bio·Node* parent, bio·Node* child)
     };
 
     prev = nil;
-    for (it = parent->child[0]; it != nil && it != child; it = it->sibling) {
+    for (it = parent->child; it != nil && it != child; it = it->sibling) {
         prev = it;
     }
     if (it == nil) return error·notfound;
@@ -59,7 +55,7 @@ phylo·countnodes(bio·Node *node, int *n)
     bio·Node *child;
     
     *n += 1;
-    for (child = node->child[0]; child != nil; child = child->sibling) {
+    for (child = node->child; child != nil; child = child->sibling) {
         if (err = phylo·countnodes(child, n), err) {
             errorf("node count: failure at '%s'", child->name);
             return 1;
@@ -79,7 +75,7 @@ phylo·countleafs(bio·Node *node, int *n)
         *n += 1;
     }
 
-    for (child = node->child[0]; child != nil; child = child->sibling) {
+    for (child = node->child; child != nil; child = child->sibling) {
         if (err = phylo·countleafs(child, n), err) {
             errorf("leaf count: failure at '%s'", child->name);
             return 1;
@@ -103,7 +99,7 @@ phylo·ladderize(bio·Node *root)
     if (!root->nchild) return 0;
     Assert(root->nchild < arrlen(dists));
 
-    for (i = 0, child = root->child[0]; child != nil; child = child->sibling, i++) {
+    for (i = 0, child = root->child; child != nil; child = child->sibling, i++) {
         if (err = phylo·ladderize(child), err) {
             errorf("ladderize: failure at '%s'", child->name);
             return 1;