Data update

Task/Call-a-function-in-a-shared-library/Pluto/call-a-function-in-a-shared-library.pluto

@@ -0,0 +1,19 @@
+local s1, s2 = "Hello", " World!"
+local ffi = require "pluto:ffi"
+local lib = ffi.open(os.platform == "windows" ? "msvcrt" : "libc.so.6")
+if lib then
+    print("Shared library found")
+    lib:cdef[[
+        char *strcat(char *dest, const char *src);
+        size_t strlen(const char *str);
+    ]]
+    local s = lib.strcat(s1, s2)
+    print(s)
+    print(lib.strlen(s))
+    lib = nil
+else
+    print("Shared library not found.")
+    local s = s1 .. s2
+    print(s)
+    print(#s)
+end