Distinguish name constructors for zt strings (#151)

example/trap.c

@@ -13,7 +13,7 @@ own wasm_trap_t* fail_callback(
 ) {
   printf("Calling back...\n");
   own wasm_name_t message;
-  wasm_name_new_from_string(&message, "callback abort");
+  wasm_name_new_from_string_nt(&message, "callback abort");
   own wasm_trap_t* trap = wasm_trap_new((wasm_store_t*)env, &message);
   wasm_name_delete(&message);
   return trap;

example/trap.cc

@@ -12,7 +12,7 @@ auto fail_callback(
 ) -> wasm::own<wasm::Trap> {
   std::cout << "Calling back..." << std::endl;
   auto store = reinterpret_cast<wasm::Store*>(env);
-  auto message = wasm::Name::make(std::string("callback abort"));
+  auto message = wasm::Name::make_nt(std::string("callback abort"));
   return wasm::Trap::make(store, message);
 }
 

include/wasm.h

@@ -106,6 +106,12 @@ typedef wasm_byte_vec_t wasm_name_t;
 
 static inline void wasm_name_new_from_string(
   own wasm_name_t* out, const char* s
+) {
+  wasm_name_new(out, strlen(s), s);
+}
+
+static inline void wasm_name_new_from_string_nt(
+  own wasm_name_t* out, const char* s
 ) {
   wasm_name_new(out, strlen(s) + 1, s);
 }

include/wasm.hh

@@ -146,6 +146,12 @@ public:
   }
 
   static auto make(std::string s) -> vec<char> {
+    auto v = vec(s.length());
+    if (v) std::strncpy(v.get(), s.data(), s.length());
+    return v;
+  }
+
+  static auto make_nt(std::string s) -> vec<char> {
     auto v = vec(s.length() + 1);
     if (v) std::strcpy(v.get(), s.data());
     return v;