Add the files

1 files changed, 21 insertions, 0 deletions

diff --git a/src/common/impl/memrchr.c b/src/common/impl/memrchr.c
new file mode 100644
index 0000000..aaf97e6
--- /dev/null
+++ b/src/common/impl/memrchr.c
@@ -0,0 +1,21 @@
+#include "common/memrchr.h"
+#include <stddef.h>
+#include <stdint.h>
+
+void* memrchr(const void* s, int c, size_t n) {
+    if (n == 0) {
+        return NULL;
+    }
+
+    const uint8_t uc = (uint8_t) c;
+
+    const uint8_t* p = (const uint8_t*) s + n;
+
+    while (n--) {
+        if (*--p == uc) {
+            return (void*) p;
+        }
+    }
+
+    return NULL;
+}