Fix memcpy UB (#422)

Can't call memcpy with size of 0 and nullptr init.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/wasm.h b/src/wasm.h
index b13011bae..393f0529b 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -1180,7 +1180,7 @@ public:
     Segment() {}
     Segment(size_t offset, const char *init, size_t size) : offset(offset) {
       data.resize(size);
-      memcpy(&data[0], init, size);
+      std::copy_n(init, size, data.begin());
     }
     Segment(size_t offset, std::vector<char>& init) : offset(offset) {
       data.swap(init);