1 files changed, 39 insertions, 0 deletions
diff --git a/strntolower.c b/strntolower.c
index 0dcad2a..33fdfa1 100644
--- a/strntolower.c
+++ b/strntolower.c
@@ -12,6 +12,45 @@ extern inline char *libsimple_strntolower(char *, const char *, size_t);
 int
 main(void)
 {
+	char buf[100];
+
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[3], &buf[0], SIZE_MAX), "abcdeabcde12345"));
+	assert(!strcmp(buf, "ABCabcdeabcde12345"));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[3], SIZE_MAX), "deabcde12345"));
+	assert(!strcmp(buf, "deabcde12345"));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[0], SIZE_MAX), "abcdeabcde12345"));
+	assert(!strcmp(buf, "abcdeabcde12345"));
+
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345");
+	buf[18] = 'X';
+	assert(!strcmpnul(libsimple_strntolower(&buf[3], &buf[0], 15), "abcdeabcde12345X"));
+	assert(!strcmp(buf, "ABCabcdeabcde12345X"));
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[3], 12), "deabcde12345345"));
+	assert(!strcmp(buf, "deabcde12345345"));
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345X");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[0], 15), "abcdeabcde12345X"));
+	assert(!strcmp(buf, "abcdeabcde12345X"));
+
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[3], &buf[0], 0), "DEabcde12345"));
+	assert(!strcmp(buf, "ABCDEabcde12345"));
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[3], 0), "ABCDEabcde12345"));
+	assert(!strcmp(buf, "ABCDEabcde12345"));
+	memset(buf, 0, sizeof(buf));
+	stpcpy(buf, "ABCDEabcde12345");
+	assert(!strcmpnul(libsimple_strntolower(&buf[0], &buf[0], 0), "ABCDEabcde12345"));
+	assert(!strcmp(buf, "ABCDEabcde12345"));
+
 	return 0;
 }