Split into multiple units

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 23 insertions, 0 deletions

diff --git a/memmem.c b/memmem.c
new file mode 100644
index 0000000..c7e331a
--- /dev/null
+++ b/memmem.c
@@ -0,0 +1,23 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+
+
+void *
+libsimple_memmem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
+{
+	char *hay = (void *)hay_, *end;
+	const char *sub = sub_;
+
+	if (!subn)
+		return hay;
+	if (hayn < subn)
+		return NULL;
+	if (subn == 1)
+		return memchr(hay, *sub, hayn);
+
+	for (end = &hay[hayn - subn + 1]; hay != end; hay++)
+		if (*hay == *sub && !memcmp(hay, sub, subn))
+			return hay;
+
+	return NULL;
+}