1 files changed, 42 insertions, 0 deletions
diff --git a/strnchr.c b/strnchr.c
new file mode 100644
index 0000000..e03df86
--- /dev/null
+++ b/strnchr.c
@@ -0,0 +1,42 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+char *
+libsimple_strnchr(const char *s_, int c_, size_t n)
+{
+	char *s = *(char **)(void *)&s_, c = (char)c_;
+	char *end = &s[n];
+	for (; s != end && *s && *s != c; s++);
+	return s == end ? NULL : *s == c ? s : NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", 'a', 13), "abcABCabcABC"));
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", 'c', 13), "cABCabcABC"));
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", 'A', 13), "ABCabcABC"));
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", 'C', 13), "CabcABC"));
+	assert(!strcmpnul(libsimple_strnchr("ABCabcABCabc", 'a', 13), "abcABCabc"));
+	assert(!strcmpnul(libsimple_strnchr("ABCabcABCabc", 'c', 13), "cABCabc"));
+	assert(!strcmpnul(libsimple_strnchr("ABCabcABCabc", 'A', 13), "ABCabcABCabc"));
+	assert(!strcmpnul(libsimple_strnchr("ABCabcABCabc", 'C', 13), "CabcABCabc"));
+	assert(!libsimple_strnchr("abcABCabcABC", 'x', 13));
+	assert(!libsimple_strnchr("abcABCabcABC", 'x', 20));
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", '\0', 13), ""));
+	assert(!strcmpnul(libsimple_strnchr("abcABCabcABC", '\0', 20), ""));
+	assert(!libsimple_strnchr("abcABCabcABC", '\0', 3));
+	assert(!libsimple_strnchr("abcdef", 'd', 3));
+	assert(!libsimple_strnchr("abcdef", 'e', 3));
+	assert(!strcmpnul(libsimple_strnchr("123123", '1', 7), "123123"));
+	assert(!strcmpnul(libsimple_strnchr("123123", '3', 7), "3123"));
+	return 0;
+}
+
+#endif