splitting things out

abuf.c

@@ -0,0 +1,27 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "abuf.h"
+
+
+void
+ab_append(struct abuf *buf, const char *s, int len)
+{
+	char	*nc = realloc(buf->b, buf->len + len);
+
+	if (nc == NULL) {
+		abort();
+	}
+
+	memcpy(&nc[buf->len], s, len);
+	buf->b = nc;
+	buf->len += len; /* DANGER: overflow */
+}
+
+
+void
+ab_free(struct abuf *buf)
+{
+	free(buf->b);
+	buf->b = NULL;
+}