1 files changed, 30 insertions, 0 deletions
diff --git a/memchr_inv.c b/memchr_inv.c
new file mode 100644
index 0000000..45885fb
--- /dev/null
+++ b/memchr_inv.c
@@ -0,0 +1,30 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memchr_inv(const void *s_, int c_, size_t n) /* TODO man */
+{
+	char *s = *(char **)(void *)&s_, c = (char)c_;
+	size_t i = 0;
+	for (; i < n && s[i] == c; i++);
+	return i < n ? &s[i] : NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_memchr_inv("xxoxx", 'x', 5), "oxx"));
+	assert(!strcmpnul(libsimple_memchr_inv("xxXxx", 'x', 5), "Xxx"));
+	assert(!strcmpnul(libsimple_memchr_inv("XXoxx", 'x', 5), "XXoxx"));
+	assert(!strcmpnul(libsimple_memchr_inv("zzzzz", 'z', 5), NULL));
+	assert(!strcmpnul(libsimple_memchr_inv("zzzzx", 'z', 3), NULL));
+	return 0;
+}
+
+#endif