1 files changed, 74 insertions, 0 deletions
diff --git a/rawmemrelem.c b/rawmemrelem.c
new file mode 100644
index 0000000..75a15a9
--- /dev/null
+++ b/rawmemrelem.c
@@ -0,0 +1,74 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_rawmemrelem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
+{
+	switch (subn) {
+	case 0:
+		return (void *)hay_;
+	case 1:
+		{
+			uint8_t *hay = (void *)hay_;
+			uint8_t sub = *(uint8_t *)sub_;
+			for (hay += hayn; *--hay != sub;);
+			return hay;
+		}
+	case 2:
+		{
+			uint16_t *hay = (void *)hay_;
+			uint16_t sub = *(uint16_t *)sub_;
+			for (hay += hayn; *--hay != sub;);
+			return hay;
+		}
+	case 4:
+		{
+			uint32_t *hay = (void *)hay_;
+			uint32_t sub = *(uint32_t *)sub_;
+			for (hay += hayn; *--hay != sub;);
+			return hay;
+		}
+	case 8:
+		{
+			uint64_t *hay = (void *)hay_;
+			uint64_t sub = *(uint64_t *)sub_;
+			for (hay += hayn; *--hay != sub;);
+			return hay;
+		}
+	default:
+		{
+			char *hay = (void *)hay_;
+			const char *sub = sub_;
+			size_t i;
+			for (hay += hayn * subn;;) {
+				hay -= subn;
+				for (i = 0; i < subn; i++)
+					if (hay[i] != sub[i])
+						goto next;
+				return hay;
+			next:;
+			}
+		}
+	}
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_rawmemrelem("12345634", 8, "", 0), "12345634"));
+	assert(!strcmpnul(libsimple_rawmemrelem("12345634", 8, "3", 1), "34"));
+	assert(!strcmpnul(libsimple_rawmemrelem("13456342", 8, "3", 1), "342"));
+	assert(!strcmpnul(libsimple_rawmemrelem("12345634", 4, "34", 2), "34"));
+	assert(!strcmpnul(libsimple_rawmemrelem("abcd1234abcd1234", 4, "1234", 4), "1234"));
+	assert(!strcmpnul(libsimple_rawmemrelem("abcdefgh12345678abcdefgh12345678", 4, "12345678", 8), "12345678"));
+	assert(!strcmpnul(libsimple_rawmemrelem("abc123abc123", 4, "123", 3), "123"));
+	return 0;
+}
+
+#endif