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diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# automake
+build-aux/
+autom4te.cache
+.deps
+.libs
+m4/
+libtool
+src/.dirstamp
+Makefile
+Makefile.in
+aclocal.m4
+configure
+configure.lineno
+depcomp
+missing
+install-sh
+stamp-h1
+compile
+config.log
+config.status
+config.status.lineno
+config.guess
+config.sub
+config.h
+config.h.in
+config.h.in~
+mingw32-config.cache
+ltmain.sh
+
+# packaging
+pkg/
+*.tar.gz
+
+# Emacs
+\#*\#
+.\#*
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..a871fcf
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,662 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
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+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
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+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
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+  An older license, called the Affero General Public License and
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+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
+
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..ef80b91
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,14 @@
+ACLOCAL_AMFLAGS = -I m4 --install
+dist_doc_DATA = README
+pkgconfigdir = $(libdir)/pkgconfig
+dist_pkgconfig_DATA = pfxtree.pc
+
+include_HEADERS = pfxtree.h
+lib_LTLIBRARIES = libpfxtree.la
+
+libpfxtree_la_SOURCES = pfxtree.c
+libpfxtree_la_LDFLAGS = -version-info 0:0:0
+libpfxtree_la_CFLAGS = -Wall -Wextra -Wunreachable-code -ftrapv -std=c89
+
+AM_CFLAGS = $(DEPS_CFLAGS)
+AM_LIBS = $(DEPS_LIBS)
diff --git a/README b/README
new file mode 100644
index 0000000..4979729
--- /dev/null
+++ b/README
@@ -0,0 +1,66 @@
+libpfxtree
+==========
+
+Delwink prefix tree (trie) library
+
+What's this for?
+----------------
+
+This was written for use with Delwink's LiberTI encoder to find keywords in
+source lines, but it is a fairly standard implementation of the
+well-established "trie" structure, also called a prefix tree.
+
+The purpose of a trie structure is to function as an efficient dictionary
+registry. New words are added to the dictionary, and the dictionary is searched
+one letter at a time to find the quickest route to the end of the desired word,
+as opposed to checking string equality for each string in the dictionary which
+is slow and inefficient on the CPU. Trie structures can be more memory
+efficient that a static string dictionary as well, because any words that share
+the same starting characters (prefix) will share the same memory for those
+characters. This does come at a cost for dictionaries with words that are
+nothing alike, because each character in the dictionary is more than 1 byte (24
+bytes each on my implementation) since it must keep track of what characters
+are adjacent to it, and this implementation of the structure allows storage of
+one integer as data for complete words (used in LiberTI's encoder to determine
+which token to replace the keyword with).
+
+Many implementations of this structure exist, but this is Delwink's preferred
+implementation since it follows Delwink's standards and development styles.
+
+Build
+-----
+
+libpfxtree uses the GNU build process. You can compile it with the following
+steps:
+
+    $ ./autogen.sh
+	$ ./configure
+	$ make
+
+Install
+-------
+
+After building (see above), you can install the library with this:
+
+    # make install
+
+Hacking
+-------
+
+libpfxtree uses the GNU coding style for C and follows a strict 79-column limit
+in its source code. Indentations are two spaces, and tab characters are eight
+spaces. It is polite to use a tab character any time eight spaces would be used
+to indent, but it is not required.
+
+To submit a patch, [submit your diff to Delwink][1], or use GitHub's pull
+request system.
+
+License
+-------
+
+libpfxtree is free software, released under the terms of version 3 of the GNU
+Affero General Public License. You are free to copy, modify, and redistribute
+this software and use it for whatever purpose. See [COPYING](COPYING) for more
+details.
+
+[1]: mailto:contribute@delwink.com
diff --git a/README.md b/README.md
new file mode 120000
index 0000000..100b938
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+README
\ No newline at end of file
diff --git a/autogen.sh b/autogen.sh
new file mode 100755
index 0000000..5b883a6
--- /dev/null
+++ b/autogen.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+set -e
+srcdir="$(dirname $0)"
+cd "$srcdir"
+autoreconf --install --force
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..dffcd94
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,18 @@
+AC_PREREQ([2.60])
+AC_INIT([libpfxtree],[0.0.0],[support@delwink.com])
+
+AC_CONFIG_SRCDIR([pfxtree.c])
+AC_CONFIG_AUX_DIR([build-aux])
+AC_CONFIG_MACRO_DIR([m4])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
+AM_SILENT_RULES([yes])
+AM_PROG_AR
+LT_INIT
+AC_PROG_CC
+
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_FILES([
+ Makefile
+])
+AC_OUTPUT
diff --git a/pfxtree.c b/pfxtree.c
new file mode 100644
index 0000000..aed2784
--- /dev/null
+++ b/pfxtree.c
@@ -0,0 +1,181 @@
+/*
+ *  libpfxtree - Delwink prefix tree library
+ *  Copyright (C) 2015 Delwink, LLC
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3 only.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "pfxtree.h"
+
+#define pt_child_foreach(S,C) for (C = S->children; C != NULL; C = C->next)
+
+PrefixTree *
+pt_new ()
+{
+  PrefixTree *self = malloc (sizeof (PrefixTree));
+  if (NULL == self)
+    return NULL;
+
+  self->ch = '\0';
+  self->data = 0;
+  self->children = NULL;
+  self->next = NULL;
+
+  return self;
+}
+
+void
+pt_free (PrefixTree *self)
+{
+  PrefixTree *child, *next = NULL;
+  for (child = self->children; child != NULL; child = next)
+    {
+      next = child->next;
+      pt_free (child);
+    }
+
+  free (self);
+}
+
+static PrefixTree *
+get_last_child (const PrefixTree *self)
+{
+  PrefixTree *child;
+  pt_child_foreach (self, child)
+    {
+      if (NULL == child->next)
+	return child;
+    }
+
+  return NULL;
+}
+
+static PrefixTree *
+get_child_by_ch (const PrefixTree *self, const char ch)
+{
+  PrefixTree *child;
+  pt_child_foreach (self, child)
+    {
+      if (ch == child->ch)
+	return child;
+    }
+
+  return NULL;
+}
+
+int
+pt_add (PrefixTree *self, const char *word, int data)
+{
+  int rc = 0;
+  PrefixTree *node = self;
+  size_t i, len = strlen (word);
+
+  for (i = 0; i <= len; ++i)
+    {
+      PrefixTree *child = get_child_by_ch (node, word[i]);
+      if (NULL == child)
+	break;
+
+      node = child;
+    }
+
+  PrefixTree *first_insertion = NULL;
+
+  for (; i <= len; ++i)
+    {
+      PrefixTree *new = pt_new ();
+      if (NULL == new)
+	{
+	  rc = PT_EALLOC;
+	  break;
+	}
+
+      new->ch = word[i];
+
+      PrefixTree *end = get_last_child (node);
+      if (NULL == end)
+	node->children = new;
+      else
+	end->next = new;
+
+      if (NULL == first_insertion)
+	first_insertion = new;
+
+      node = new;
+    }
+
+  if (rc)
+    {
+      pt_free (first_insertion);
+      return rc;
+    }
+
+  node->data = data;
+
+  return rc;
+}
+
+int
+pt_data (const PrefixTree *self)
+{
+  return self->data;
+}
+
+const PrefixTree *
+pt_search (const PrefixTree *root, const char *word)
+{
+  const PrefixTree *node = root;
+  size_t i, len = strlen (word);
+
+  for (i = 0; i <= len; ++i)
+    {
+      PrefixTree *child;
+      pt_child_foreach (node, child)
+	{
+	  if (word[i] == child->ch)
+	    {
+	      node = child;
+	      break;
+	    }
+	  else if (NULL == child->next)
+	    {
+	      node = NULL;
+	    }
+	}
+
+      if (NULL == node)
+	return NULL;
+
+      if ('\0' == node->ch)
+	return node;
+    }
+
+  return NULL;
+}
+
+const char *
+pt_version ()
+{
+#ifdef HAVE_CONFIG_H
+  return PACKAGE_VERSION;
+#else
+  return "Unknown";
+#endif
+}
diff --git a/pfxtree.h b/pfxtree.h
new file mode 100644
index 0000000..1eb5a3e
--- /dev/null
+++ b/pfxtree.h
@@ -0,0 +1,109 @@
+/*
+ *  libpfxtree - Delwink prefix tree library
+ *  Copyright (C) 2015 Delwink, LLC
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3 only.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file pfxtree.h
+ * @version 0.0
+ * @date 09/05/2015
+ * @author David McMackins II
+ * @brief Delwink prefix tree (trie) library
+ */
+
+#ifndef DELWINK_PFXTREE_H
+#define DELWINK_PFXTREE_H
+
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS
+# define __END_DECLS
+#endif
+
+__BEGIN_DECLS
+
+/**
+ * @brief Error codes possibly returned by functions in this library.
+ */
+enum pt_error
+{
+  PT_EALLOC = -1
+};
+
+/**
+ * @brief A node in a prefix tree.
+ */
+typedef struct trie
+{
+  char ch;
+  int data;
+
+  struct trie *children;
+  struct trie *next;
+} PrefixTree;
+
+/**
+ * @brief Creates a new prefix tree.
+ * @return Pointer to the root node of the tree or NULL on failure.
+ */
+PrefixTree *
+pt_new (void);
+
+/**
+ * @brief Frees an allocated prefix tree (and its child nodes).
+ * @param self The tree to free.
+ */
+void
+pt_free (PrefixTree *self);
+
+/**
+ * @brief Adds a new word to a prefix tree.
+ * @param self The tree to which to add the word.
+ * @param word The word to be added.
+ * @param data A number to be associated with the word.
+ * @return Nonzero if an error occurred.
+ */
+int
+pt_add (PrefixTree *self, const char *word, int data);
+
+/**
+ * @brief Gets the data from a prefix tree node.
+ * @param self The node from which to get the data.
+ * @return self's data (default 0).
+ */
+int
+pt_data (const PrefixTree *self);
+
+/**
+ * @brief Searches for a word in a prefix tree.
+ * @param root The node from which to begin the search.
+ * @param word The word for which to search.
+ * @return Pointer to the data-storing node of the word or NULL if not found.
+ */
+const PrefixTree *
+pt_search (const PrefixTree *root, const char *word);
+
+/**
+ * @brief Checks the current version of the library.
+ * @return A version string for this libpfxtree installation.
+ */
+const char *
+pt_version (void);
+
+__END_DECLS
+
+#endif
diff --git a/pfxtree.pc b/pfxtree.pc
new file mode 100644
index 0000000..50272c8
--- /dev/null
+++ b/pfxtree.pc
@@ -0,0 +1,10 @@
+prefix = /usr
+exec_prefix = ${prefix}
+libdir = ${exec_prefix}/lib
+includedir = ${prefix}/include
+
+Version: 0.0.0
+Cflags = -I${includedir}
+Description: Delwink prefix tree library
+Name: pfxtree
+Libs: -lpfxtree
\ No newline at end of file