From ad1457beb2b61fc918e4be616a9679e30729bbd4 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Mon, 28 Mar 2016 16:36:01 +1300
Subject: Tinkering with simple binary trees

Trying to keep the code nice and terse. strcmp(3) usage here possibly
unsafe.
---
 .gitignore  |  2 ++
 Makefile    |  9 +++++++++
 btree-int.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 btree-str.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 118 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 btree-int.c
 create mode 100644 btree-str.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fcb13a2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+btree-int
+btree-str
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ec2658d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: all clean
+
+CC = clang
+CFLAGS = -std=c90 -Weverything
+
+all : btree-int btree-str
+
+clean :
+	rm -f btree-int btree-str
diff --git a/btree-int.c b/btree-int.c
new file mode 100644
index 0000000..8935760
--- /dev/null
+++ b/btree-int.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct Node {
+    long v;
+    struct Node *l;
+    struct Node *r;
+} Node;
+
+void an(Node **, Node *);
+void pn(Node *);
+
+void an(Node **r, Node *n) {
+    if (!*r) {
+        *r = n;
+        return;
+    }
+    if (n->v > (*r)->v) {
+        an(&((*r)->r), n);
+    } else {
+        an(&((*r)->l), n);
+    }
+    return;
+}
+
+void pn(Node *n) {
+    if (!n) {
+        return;
+    }
+    if (n->l) {
+        pn(n->l);
+    }
+    fprintf(stdout, "%ld\n", n->v);
+    if (n->r) {
+        pn(n->r);
+    }
+    return;
+}
+
+int main(int argc, char **argv) {
+    Node *r = NULL;
+
+    for (argv++, argc--; argc; argv++, argc--) {
+        Node *n = malloc(sizeof(Node));
+        n->v = atoi(*argv);
+        n->l = n->r = NULL;
+        an(&r, n);
+    }
+
+    pn(r);
+
+    exit(EXIT_SUCCESS);
+}
diff --git a/btree-str.c b/btree-str.c
new file mode 100644
index 0000000..3f080a4
--- /dev/null
+++ b/btree-str.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct Node {
+    char *v;
+    struct Node *l;
+    struct Node *r;
+} Node;
+
+void an(Node **, Node *);
+void pn(Node *);
+
+void an(Node **r, Node *n) {
+    if (!*r) {
+        *r = n;
+        return;
+    }
+    if (strcmp(n->v, (*r)->v) > 0) {
+        an(&((*r)->r), n);
+    } else {
+        an(&((*r)->l), n);
+    }
+    return;
+}
+
+void pn(Node *n) {
+    if (!n) {
+        return;
+    }
+    if (n->l) {
+        pn(n->l);
+    }
+    fprintf(stdout, "%s\n", n->v);
+    if (n->r) {
+        pn(n->r);
+    }
+    return;
+}
+
+int main(int argc, char **argv) {
+    Node *r = NULL;
+
+    for (argv++, argc--; argc; argv++, argc--) {
+        Node *n = malloc(sizeof(Node));
+        n->v = *argv;
+        n->l = n->r = NULL;
+        an(&r, n);
+    }
+
+    pn(r);
+
+    exit(EXIT_SUCCESS);
+}
-- 
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