1 files changed, 47 insertions, 0 deletions
diff --git a/strrnchr.c b/strrnchr.c
new file mode 100644
index 0000000..d67775e
--- /dev/null
+++ b/strrnchr.c
@@ -0,0 +1,47 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+char *
+libsimple_strrnchr(const char *s_, int c_, size_t n)
+{
+	char *s = *(char **)(void *)&s_, c = (char)c_;
+	char *end = &s[n], *r = NULL;
+	for (; s != end; s++) {
+		if (*s == c)
+			r = s;
+		if (!*s)
+			break;
+	}
+	return r;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", 'a', 13), "abcABC"));
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", 'c', 13), "cABC"));
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", 'A', 13), "ABC"));
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", 'C', 13), "C"));
+	assert(!strcmpnul(libsimple_strrnchr("ABCabcABCabc", 'a', 13), "abc"));
+	assert(!strcmpnul(libsimple_strrnchr("ABCabcABCabc", 'c', 13), "c"));
+	assert(!strcmpnul(libsimple_strrnchr("ABCabcABCabc", 'A', 13), "ABCabc"));
+	assert(!strcmpnul(libsimple_strrnchr("ABCabcABCabc", 'C', 13), "Cabc"));
+	assert(!libsimple_strrnchr("abcABCabcABC", 'x', 13));
+	assert(!libsimple_strrnchr("abcABCabcABC", 'x', 20));
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", '\0', 13), ""));
+	assert(!strcmpnul(libsimple_strrnchr("abcABCabcABC", '\0', 20), ""));
+	assert(!libsimple_strrnchr("abcABCabcABC", '\0', 3));
+	assert(!libsimple_strrnchr("abcdef", 'd', 3));
+	assert(!libsimple_strrnchr("abcdef", 'e', 3));
+	assert(!strcmpnul(libsimple_strrnchr("123123", '1', 7), "123"));
+	assert(!strcmpnul(libsimple_strrnchr("123123", '3', 7), "3"));
+	return 0;
+}
+
+#endif