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-rw-r--r--memmem.c23
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;
+}