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-rw-r--r--build/Makefile.am11
-rw-r--r--build/Makefile.tests8
-rw-r--r--build/cutest/CuTest.c329
-rw-r--r--build/cutest/CuTest.h111
-rw-r--r--build/cutest/README.txt211
-rw-r--r--build/cutest/license.txt38
-rw-r--r--build/m4/.empty1
7 files changed, 709 insertions, 0 deletions
diff --git a/build/Makefile.am b/build/Makefile.am
new file mode 100644
index 0000000..f8841ec
--- /dev/null
+++ b/build/Makefile.am
@@ -0,0 +1,11 @@
+
+EXTRA_DIST = \
+ cutest \
+ Makefile.tests
+
+noinst_LTLIBRARIES = \
+ libcutest.la
+
+libcutest_la_SOURCES = \
+ cutest/CuTest.c \
+ cutest/CuTest.h
diff --git a/build/Makefile.tests b/build/Makefile.tests
new file mode 100644
index 0000000..9f41045
--- /dev/null
+++ b/build/Makefile.tests
@@ -0,0 +1,8 @@
+
+CUTEST_CFLAGS = \
+ -I$(top_srcdir)/build/cutest \
+ -DSRCDIR=\"$(abs_srcdir)\" \
+ -DBUILDDIR=\"$(abs_builddir)\" \
+ -DP11_KIT_FUTURE_UNSTABLE_API
+
+CUTEST_LIBS = $(top_builddir)/build/libcutest.la
diff --git a/build/cutest/CuTest.c b/build/cutest/CuTest.c
new file mode 100644
index 0000000..b033483
--- /dev/null
+++ b/build/cutest/CuTest.c
@@ -0,0 +1,329 @@
+#include <assert.h>
+#include <setjmp.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include "CuTest.h"
+
+/*-------------------------------------------------------------------------*
+ * CuStr
+ *-------------------------------------------------------------------------*/
+
+char* CuStrAlloc(int size)
+{
+ char* newStr = (char*) malloc( sizeof(char) * (size) );
+ return newStr;
+}
+
+char* CuStrCopy(const char* old)
+{
+ int len = strlen(old);
+ char* newStr = CuStrAlloc(len + 1);
+ strcpy(newStr, old);
+ return newStr;
+}
+
+/*-------------------------------------------------------------------------*
+ * CuString
+ *-------------------------------------------------------------------------*/
+
+void CuStringInit(CuString* str)
+{
+ str->length = 0;
+ str->size = STRING_MAX;
+ str->buffer = (char*) malloc(sizeof(char) * str->size);
+ str->buffer[0] = '\0';
+}
+
+CuString* CuStringNew(void)
+{
+ CuString* str = (CuString*) malloc(sizeof(CuString));
+ str->length = 0;
+ str->size = STRING_MAX;
+ str->buffer = (char*) malloc(sizeof(char) * str->size);
+ str->buffer[0] = '\0';
+ return str;
+}
+
+void CuStringDelete(CuString *str)
+{
+ if (!str) return;
+ free(str->buffer);
+ free(str);
+}
+
+void CuStringResize(CuString* str, int newSize)
+{
+ str->buffer = (char*) realloc(str->buffer, sizeof(char) * newSize);
+ str->size = newSize;
+}
+
+void CuStringAppend(CuString* str, const char* text)
+{
+ int length;
+
+ if (text == NULL) {
+ text = "NULL";
+ }
+
+ length = strlen(text);
+ if (str->length + length + 1 >= str->size)
+ CuStringResize(str, str->length + length + 1 + STRING_INC);
+ str->length += length;
+ strcat(str->buffer, text);
+}
+
+void CuStringAppendChar(CuString* str, char ch)
+{
+ char text[2];
+ text[0] = ch;
+ text[1] = '\0';
+ CuStringAppend(str, text);
+}
+
+void CuStringAppendFormat(CuString* str, const char* format, ...)
+{
+ va_list argp;
+ char buf[HUGE_STRING_LEN];
+ va_start(argp, format);
+ vsprintf(buf, format, argp);
+ va_end(argp);
+ CuStringAppend(str, buf);
+}
+
+void CuStringInsert(CuString* str, const char* text, int pos)
+{
+ int length = strlen(text);
+ if (pos > str->length)
+ pos = str->length;
+ if (str->length + length + 1 >= str->size)
+ CuStringResize(str, str->length + length + 1 + STRING_INC);
+ memmove(str->buffer + pos + length, str->buffer + pos, (str->length - pos) + 1);
+ str->length += length;
+ memcpy(str->buffer + pos, text, length);
+}
+
+/*-------------------------------------------------------------------------*
+ * CuTest
+ *-------------------------------------------------------------------------*/
+
+void CuTestInit(CuTest* t, const char* name, TestFunction function)
+{
+ t->name = CuStrCopy(name);
+ t->failed = 0;
+ t->ran = 0;
+ t->message = NULL;
+ t->function = function;
+ t->jumpBuf = NULL;
+}
+
+CuTest* CuTestNew(const char* name, TestFunction function)
+{
+ CuTest* tc = CU_ALLOC(CuTest);
+ CuTestInit(tc, name, function);
+ return tc;
+}
+
+void CuTestDelete(CuTest *t)
+{
+ if (!t) return;
+ free(t->name);
+ free(t);
+}
+
+void CuTestRun(CuTest* tc)
+{
+ jmp_buf buf;
+ tc->jumpBuf = &buf;
+ if (setjmp(buf) == 0)
+ {
+ tc->ran = 1;
+ (tc->function)(tc);
+ }
+ tc->jumpBuf = 0;
+}
+
+static void CuFailInternal(CuTest* tc, const char* file, int line, CuString* string)
+{
+ char buf[HUGE_STRING_LEN];
+
+ sprintf(buf, "%s:%d: ", file, line);
+ CuStringInsert(string, buf, 0);
+
+ tc->failed = 1;
+ tc->message = string->buffer;
+ if (tc->jumpBuf != 0) longjmp(*(tc->jumpBuf), 0);
+}
+
+void CuFail_Line(CuTest* tc, const char* file, int line, const char* message2, const char* message)
+{
+ CuString string;
+
+ CuStringInit(&string);
+ if (message2 != NULL)
+ {
+ CuStringAppend(&string, message2);
+ CuStringAppend(&string, ": ");
+ }
+ CuStringAppend(&string, message);
+ CuFailInternal(tc, file, line, &string);
+}
+
+void CuAssert_Line(CuTest* tc, const char* file, int line, const char* message, int condition)
+{
+ if (condition) return;
+ CuFail_Line(tc, file, line, NULL, message);
+}
+
+void CuAssertStrEquals_LineMsg(CuTest* tc, const char* file, int line, const char* message,
+ const char* expected, const char* actual)
+{
+ CuString string;
+ if ((expected == NULL && actual == NULL) ||
+ (expected != NULL && actual != NULL &&
+ strcmp(expected, actual) == 0))
+ {
+ return;
+ }
+
+ CuStringInit(&string);
+ if (message != NULL)
+ {
+ CuStringAppend(&string, message);
+ CuStringAppend(&string, ": ");
+ }
+ CuStringAppend(&string, "expected <");
+ CuStringAppend(&string, expected);
+ CuStringAppend(&string, "> but was <");
+ CuStringAppend(&string, actual);
+ CuStringAppend(&string, ">");
+ CuFailInternal(tc, file, line, &string);
+}
+
+void CuAssertIntEquals_LineMsg(CuTest* tc, const char* file, int line, const char* message,
+ int expected, int actual)
+{
+ char buf[STRING_MAX];
+ if (expected == actual) return;
+ sprintf(buf, "expected <%d> but was <%d>", expected, actual);
+ CuFail_Line(tc, file, line, message, buf);
+}
+
+void CuAssertPtrEquals_LineMsg(CuTest* tc, const char* file, int line, const char* message,
+ void* expected, void* actual)
+{
+ char buf[STRING_MAX];
+ if (expected == actual) return;
+ sprintf(buf, "expected pointer <0x%p> but was <0x%p>", expected, actual);
+ CuFail_Line(tc, file, line, message, buf);
+}
+
+
+/*-------------------------------------------------------------------------*
+ * CuSuite
+ *-------------------------------------------------------------------------*/
+
+void CuSuiteInit(CuSuite* testSuite)
+{
+ testSuite->count = 0;
+ testSuite->failCount = 0;
+ memset(testSuite->list, 0, sizeof(testSuite->list));
+}
+
+CuSuite* CuSuiteNew(void)
+{
+ CuSuite* testSuite = CU_ALLOC(CuSuite);
+ CuSuiteInit(testSuite);
+ return testSuite;
+}
+
+void CuSuiteDelete(CuSuite *testSuite)
+{
+ unsigned int n;
+ for (n=0; n < MAX_TEST_CASES; n++)
+ {
+ if (testSuite->list[n])
+ {
+ CuTestDelete(testSuite->list[n]);
+ }
+ }
+ free(testSuite);
+
+}
+
+void CuSuiteAdd(CuSuite* testSuite, CuTest *testCase)
+{
+ assert(testSuite->count < MAX_TEST_CASES);
+ testSuite->list[testSuite->count] = testCase;
+ testSuite->count++;
+}
+
+void CuSuiteAddSuite(CuSuite* testSuite, CuSuite* testSuite2)
+{
+ int i;
+ for (i = 0 ; i < testSuite2->count ; ++i)
+ {
+ CuTest* testCase = testSuite2->list[i];
+ CuSuiteAdd(testSuite, testCase);
+ }
+}
+
+void CuSuiteRun(CuSuite* testSuite)
+{
+ int i;
+ for (i = 0 ; i < testSuite->count ; ++i)
+ {
+ CuTest* testCase = testSuite->list[i];
+ CuTestRun(testCase);
+ if (testCase->failed) { testSuite->failCount += 1; }
+ }
+}
+
+void CuSuiteSummary(CuSuite* testSuite, CuString* summary)
+{
+ int i;
+ for (i = 0 ; i < testSuite->count ; ++i)
+ {
+ CuTest* testCase = testSuite->list[i];
+ CuStringAppend(summary, testCase->failed ? "F" : ".");
+ }
+ CuStringAppend(summary, "\n\n");
+}
+
+void CuSuiteDetails(CuSuite* testSuite, CuString* details)
+{
+ int i;
+ int failCount = 0;
+
+ if (testSuite->failCount == 0)
+ {
+ int passCount = testSuite->count - testSuite->failCount;
+ const char* testWord = passCount == 1 ? "test" : "tests";
+ CuStringAppendFormat(details, "OK (%d %s)\n", passCount, testWord);
+ }
+ else
+ {
+ if (testSuite->failCount == 1)
+ CuStringAppend(details, "There was 1 failure:\n");
+ else
+ CuStringAppendFormat(details, "There were %d failures:\n", testSuite->failCount);
+
+ for (i = 0 ; i < testSuite->count ; ++i)
+ {
+ CuTest* testCase = testSuite->list[i];
+ if (testCase->failed)
+ {
+ failCount++;
+ CuStringAppendFormat(details, "%d) %s: %s\n",
+ failCount, testCase->name, testCase->message);
+ }
+ }
+ CuStringAppend(details, "\n!!!FAILURES!!!\n");
+
+ CuStringAppendFormat(details, "Runs: %d ", testSuite->count);
+ CuStringAppendFormat(details, "Passes: %d ", testSuite->count - testSuite->failCount);
+ CuStringAppendFormat(details, "Fails: %d\n", testSuite->failCount);
+ }
+}
diff --git a/build/cutest/CuTest.h b/build/cutest/CuTest.h
new file mode 100644
index 0000000..b82d05b
--- /dev/null
+++ b/build/cutest/CuTest.h
@@ -0,0 +1,111 @@
+#ifndef CU_TEST_H
+#define CU_TEST_H
+
+#include <setjmp.h>
+#include <stdarg.h>
+
+#define CUTEST_VERSION "CuTest 1.5"
+
+/* CuString */
+
+char* CuStrAlloc(int size);
+char* CuStrCopy(const char* old);
+
+#define CU_ALLOC(TYPE) ((TYPE*) malloc(sizeof(TYPE)))
+
+#define HUGE_STRING_LEN 8192
+#define STRING_MAX 256
+#define STRING_INC 256
+
+typedef struct
+{
+ int length;
+ int size;
+ char* buffer;
+} CuString;
+
+void CuStringInit(CuString* str);
+CuString* CuStringNew(void);
+void CuStringRead(CuString* str, const char* path);
+void CuStringAppend(CuString* str, const char* text);
+void CuStringAppendChar(CuString* str, char ch);
+void CuStringAppendFormat(CuString* str, const char* format, ...);
+void CuStringInsert(CuString* str, const char* text, int pos);
+void CuStringResize(CuString* str, int newSize);
+void CuStringDelete(CuString* str);
+
+/* CuTest */
+
+typedef struct CuTest CuTest;
+
+typedef void (*TestFunction)(CuTest *);
+
+struct CuTest
+{
+ char* name;
+ TestFunction function;
+ int failed;
+ int ran;
+ const char* message;
+ jmp_buf *jumpBuf;
+};
+
+void CuTestInit(CuTest* t, const char* name, TestFunction function);
+CuTest* CuTestNew(const char* name, TestFunction function);
+void CuTestRun(CuTest* tc);
+void CuTestDelete(CuTest *t);
+
+/* Internal versions of assert functions -- use the public versions */
+void CuFail_Line(CuTest* tc, const char* file, int line, const char* message2, const char* message);
+void CuAssert_Line(CuTest* tc, const char* file, int line, const char* message, int condition);
+void CuAssertStrEquals_LineMsg(CuTest* tc,
+ const char* file, int line, const char* message,
+ const char* expected, const char* actual);
+void CuAssertIntEquals_LineMsg(CuTest* tc,
+ const char* file, int line, const char* message,
+ int expected, int actual);
+void CuAssertPtrEquals_LineMsg(CuTest* tc,
+ const char* file, int line, const char* message,
+ void* expected, void* actual);
+
+/* public assert functions */
+
+#define CuFail(tc, ms) CuFail_Line( (tc), __FILE__, __LINE__, NULL, (ms))
+#define CuAssert(tc, ms, cond) CuAssert_Line((tc), __FILE__, __LINE__, (ms), (cond))
+#define CuAssertTrue(tc, cond) CuAssert_Line((tc), __FILE__, __LINE__, "assert failed", (cond))
+
+#define CuAssertStrEquals(tc,ex,ac) CuAssertStrEquals_LineMsg((tc),__FILE__,__LINE__,NULL,(ex),(ac))
+#define CuAssertStrEquals_Msg(tc,ms,ex,ac) CuAssertStrEquals_LineMsg((tc),__FILE__,__LINE__,(ms),(ex),(ac))
+#define CuAssertIntEquals(tc,ex,ac) CuAssertIntEquals_LineMsg((tc),__FILE__,__LINE__,NULL,(ex),(ac))
+#define CuAssertIntEquals_Msg(tc,ms,ex,ac) CuAssertIntEquals_LineMsg((tc),__FILE__,__LINE__,(ms),(ex),(ac))
+#define CuAssertPtrEquals(tc,ex,ac) CuAssertPtrEquals_LineMsg((tc),__FILE__,__LINE__,NULL,(ex),(ac))
+#define CuAssertPtrEquals_Msg(tc,ms,ex,ac) CuAssertPtrEquals_LineMsg((tc),__FILE__,__LINE__,(ms),(ex),(ac))
+
+#define CuAssertPtrNotNull(tc,p) CuAssert_Line((tc),__FILE__,__LINE__,"null pointer unexpected",(p != NULL))
+#define CuAssertPtrNotNullMsg(tc,msg,p) CuAssert_Line((tc),__FILE__,__LINE__,(msg),(p != NULL))
+
+/* CuSuite */
+
+#define MAX_TEST_CASES 1024
+
+#define SUITE_ADD_TEST(SUITE,TEST) CuSuiteAdd(SUITE, CuTestNew(#TEST, TEST))
+
+typedef struct
+{
+ int count;
+ CuTest* list[MAX_TEST_CASES];
+ int failCount;
+
+} CuSuite;
+
+
+void CuSuiteInit(CuSuite* testSuite);
+CuSuite* CuSuiteNew(void);
+void CuSuiteDelete(CuSuite *testSuite);
+void CuSuiteAdd(CuSuite* testSuite, CuTest *testCase);
+void CuSuiteAddSuite(CuSuite* testSuite, CuSuite* testSuite2);
+void CuSuiteRun(CuSuite* testSuite);
+void CuSuiteSummary(CuSuite* testSuite, CuString* summary);
+void CuSuiteDetails(CuSuite* testSuite, CuString* details);
+
+#endif /* CU_TEST_H */
diff --git a/build/cutest/README.txt b/build/cutest/README.txt
new file mode 100644
index 0000000..96e8853
--- /dev/null
+++ b/build/cutest/README.txt
@@ -0,0 +1,211 @@
+HOW TO USE
+
+You can use CuTest to create unit tests to drive your development
+in the style of Extreme Programming. You can also add unit tests to
+existing code to ensure that it works as you suspect.
+
+Your unit tests are an investment. They let you to change your
+code and add new features confidently without worrying about
+accidentally breaking earlier features.
+
+
+LICENSING
+
+For details on licensing see license.txt.
+
+
+GETTING STARTED
+
+To add unit testing to your C code the only files you need are
+CuTest.c and CuTest.h.
+
+CuTestTest.c and AllTests.c have been included to provide an
+example of how to write unit tests and then how to aggregate them
+into suites and into a single AllTests.c file. Suites allow you
+to put group tests into logical sets. AllTests.c combines all the
+suites and runs them.
+
+You should not have to look inside CuTest.c. Looking in
+CuTestTest.c and AllTests.c (for example usage) should be
+sufficient.
+
+After downloading the sources, run your compiler to create an
+executable called AllTests.exe. For example, if you are using
+Windows with the cl.exe compiler you would type:
+
+ cl.exe AllTests.c CuTest.c CuTestTest.c
+ AllTests.exe
+
+This will run all the unit tests associated with CuTest and print
+the output on the console. You can replace cl.exe with gcc or
+your favorite compiler in the command above.
+
+
+DETAILED EXAMPLE
+
+Here is a more detailed example. We will work through a simple
+test first exercise. The goal is to create a library of string
+utilities. First, lets write a function that converts a
+null-terminated string to all upper case.
+
+Ensure that CuTest.c and CuTest.h are accessible from your C
+project. Next, create a file called StrUtil.c with these
+contents:
+
+ #include "CuTest.h"
+
+ char* StrToUpper(char* str) {
+ return str;
+ }
+
+ void TestStrToUpper(CuTest *tc) {
+ char* input = strdup("hello world");
+ char* actual = StrToUpper(input);
+ char* expected = "HELLO WORLD";
+ CuAssertStrEquals(tc, expected, actual);
+ }
+
+ CuSuite* StrUtilGetSuite() {
+ CuSuite* suite = CuSuiteNew();
+ SUITE_ADD_TEST(suite, TestStrToUpper);
+ return suite;
+ }
+
+Create another file called AllTests.c with these contents:
+
+ #include "CuTest.h"
+
+ CuSuite* StrUtilGetSuite();
+
+ void RunAllTests(void) {
+ CuString *output = CuStringNew();
+ CuSuite* suite = CuSuiteNew();
+
+ CuSuiteAddSuite(suite, StrUtilGetSuite());
+
+ CuSuiteRun(suite);
+ CuSuiteSummary(suite, output);
+ CuSuiteDetails(suite, output);
+ printf("%s\n", output->buffer);
+ }
+
+ int main(void) {
+ RunAllTests();
+ }
+
+Then type this on the command line:
+
+ gcc AllTests.c CuTest.c StrUtil.c
+
+to compile. You can replace gcc with your favorite compiler.
+CuTest should be portable enough to handle all Windows and Unix
+compilers. Then to run the tests type:
+
+ a.out
+
+This will print an error because we haven't implemented the
+StrToUpper function correctly. We are just returning the string
+without changing it to upper case.
+
+ char* StrToUpper(char* str) {
+ return str;
+ }
+
+Rewrite this as follows:
+
+ char* StrToUpper(char* str) {
+ char* p;
+ for (p = str ; *p ; ++p) *p = toupper(*p);
+ return str;
+ }
+
+Recompile and run the tests again. The test should pass this
+time.
+
+
+WHAT TO DO NEXT
+
+At this point you might want to write more tests for the
+StrToUpper function. Here are some ideas:
+
+TestStrToUpper_EmptyString : pass in ""
+TestStrToUpper_UpperCase : pass in "HELLO WORLD"
+TestStrToUpper_MixedCase : pass in "HELLO world"
+TestStrToUpper_Numbers : pass in "1234 hello"
+
+As you write each one of these tests add it to StrUtilGetSuite
+function. If you don't the tests won't be run. Later as you write
+other functions and write tests for them be sure to include those
+in StrUtilGetSuite also. The StrUtilGetSuite function should
+include all the tests in StrUtil.c
+
+Over time you will create another file called FunkyStuff.c
+containing other functions unrelated to StrUtil. Follow the same
+pattern. Create a FunkyStuffGetSuite function in FunkyStuff.c.
+And add FunkyStuffGetSuite to AllTests.c.
+
+The framework is designed in the way it is so that it is easy to
+organize a lot of tests.
+
+THE BIG PICTURE
+
+Each individual test corresponds to a CuTest. These are grouped
+to form a CuSuite. CuSuites can hold CuTests or other CuSuites.
+AllTests.c collects all the CuSuites in the program into a single
+CuSuite which it then runs as a single CuSuite.
+
+The project is open source so feel free to take a peek under the
+hood at the CuTest.c file to see how it works. CuTestTest.c
+contains tests for CuTest.c. So CuTest tests itself.
+
+Since AllTests.c has a main() you will need to exclude this when
+you are building your product. Here is a nicer way to do this if
+you want to avoid messing with multiple builds. Remove the main()
+in AllTests.c. Note that it just calls RunAllTests(). Instead
+we'll call this directly from the main program.
+
+Now in the main() of the actual program check to see if the
+command line option "--test" was passed. If it was then I call
+RunAllTests() from AllTests.c. Otherwise run the real program.
+
+Shipping the tests with the code can be useful. If you customers
+complain about a problem you can ask them to run the unit tests
+and send you the output. This can help you to quickly isolate the
+piece of your system that is malfunctioning in the customer's
+environment.
+
+CuTest offers a rich set of CuAssert functions. Here is a list:
+
+void CuAssert(CuTest* tc, char* message, int condition);
+void CuAssertTrue(CuTest* tc, int condition);
+void CuAssertStrEquals(CuTest* tc, char* expected, char* actual);
+void CuAssertIntEquals(CuTest* tc, int expected, int actual);
+void CuAssertPtrEquals(CuTest* tc, void* expected, void* actual);
+void CuAssertPtrNotNull(CuTest* tc, void* pointer);
+
+The project is open source and so you can add other more powerful
+asserts to make your tests easier to write and more concise.
+Please feel free to send me changes you make so that I can
+incorporate them into future releases.
+
+If you see any errors in this document please contact me at
+asimjalis@peakprogramming.com.
+
+
+AUTOMATING TEST SUITE GENERATION
+
+make-tests.sh will grep through all the .c files in the current
+directory and generate the code to run all the tests contained in
+them. Using this script you don't have to worry about writing
+AllTests.c or dealing with any of the other suite code.
+
+
+CREDITS
+
+These people have contributed useful code changes to the CuTest project.
+Thanks!
+
+- [02.23.2003] Dave Glowacki <dglo@hyde.ssec.wisc.edu>
+- [04.17.2009] Tobias Lippert <herrmarder@googlemail.com>
+- [11.13.2009] Eli Bendersky <eliben@gmail.com>
+- [12.14.2009] Andrew Brown <abrown@datasci.com>
diff --git a/build/cutest/license.txt b/build/cutest/license.txt
new file mode 100644
index 0000000..3d94167
--- /dev/null
+++ b/build/cutest/license.txt
@@ -0,0 +1,38 @@
+NOTE
+
+The license is based on the zlib/libpng license. For more details see
+http://www.opensource.org/licenses/zlib-license.html. The intent of the
+license is to:
+
+- keep the license as simple as possible
+- encourage the use of CuTest in both free and commercial applications
+ and libraries
+- keep the source code together
+- give credit to the CuTest contributors for their work
+
+If you ship CuTest in source form with your source distribution, the
+following license document must be included with it in unaltered form.
+If you find CuTest useful we would like to hear about it.
+
+LICENSE
+
+Copyright (c) 2003 Asim Jalis
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software in
+a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and must not
+be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
diff --git a/build/m4/.empty b/build/m4/.empty
new file mode 100644
index 0000000..be533a1
--- /dev/null
+++ b/build/m4/.empty
@@ -0,0 +1 @@
+Stub file to track in git