1 files changed, 43 insertions, 0 deletions
diff --git a/strncasechr.c b/strncasechr.c
new file mode 100644
index 0000000..9ba2b93
--- /dev/null
+++ b/strncasechr.c
@@ -0,0 +1,43 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+char *
+libsimple_strncasechr(const char *s_, int c, size_t n)
+{
+	char *s = *(char **)(void *)&s_;
+	char *end = &s[n];
+	c = tolower(c);
+	for (; s != end && *s && tolower(*s) != c; s++);
+	return s == end ? NULL : tolower(*s) == c ? s : NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", 'a', 13), "abcABCabcABC"));
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", 'c', 13), "cABCabcABC"));
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", 'A', 13), "abcABCabcABC"));
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", 'C', 13), "cABCabcABC"));
+	assert(!strcmpnul(libsimple_strncasechr("ABCabcABCabc", 'a', 13), "ABCabcABCabc"));
+	assert(!strcmpnul(libsimple_strncasechr("ABCabcABCabc", 'c', 13), "CabcABCabc"));
+	assert(!strcmpnul(libsimple_strncasechr("ABCabcABCabc", 'A', 13), "ABCabcABCabc"));
+	assert(!strcmpnul(libsimple_strncasechr("ABCabcABCabc", 'C', 13), "CabcABCabc"));
+	assert(!libsimple_strncasechr("abcABCabcABC", 'x', 13));
+	assert(!libsimple_strncasechr("abcABCabcABC", 'x', 20));
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", '\0', 13), ""));
+	assert(!strcmpnul(libsimple_strncasechr("abcABCabcABC", '\0', 20), ""));
+	assert(!libsimple_strncasechr("abcABCabcABC", '\0', 3));
+	assert(!libsimple_strncasechr("abcdef", 'd', 3));
+	assert(!libsimple_strncasechr("abcdef", 'e', 3));
+	assert(!strcmpnul(libsimple_strncasechr("123123", '1', 7), "123123"));
+	assert(!strcmpnul(libsimple_strncasechr("123123", '3', 7), "3123"));
+	return 0;
+}
+
+#endif