more fixes/tests for empty strings

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@9083 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/li_std_string.i

@@ -127,3 +127,23 @@ public:
 
 }; 
 %}
+
+%inline %{
+  std::string empty() {
+    return std::string();
+  }
+
+  char *c_empty() {
+    return "";
+  }
+
+  char *c_null() {
+    return 0;
+  }
+
+  const char *get_null(const char *a) {
+    return a == 0 ? a : "non-null";
+  }
+
+
+%}

Examples/test-suite/perl5/li_std_string_runme.pl

@@ -118,3 +118,29 @@ if ($gen1->testl(9234567890121111113) ne 9234567890121111114) {
   die ("ulonglong");
 }
 
+
+if (li_std_string::empty() ne "") {
+    die ("empty");
+}
+
+if (li_std_string::c_empty() ne "") {
+    die ("c_empty");
+}
+
+
+if (li_std_string::c_null() ne undef) {
+    die ("c_empty");
+}
+
+
+if (li_std_string::get_null(li_std_string::c_null()) ne undef) {
+    die ("c_empty");
+}
+
+if (li_std_string::get_null(li_std_string::c_empty()) ne "non-null") {
+    die ("c_empty");
+}
+
+if (li_std_string::get_null(li_std_string::empty()) ne "non-null") {
+    die ("c_empty");
+}

Examples/test-suite/python/li_std_string_runme.py

@@ -119,3 +119,14 @@ if li_std_string.test_reference_input("hello") != "hello":
 s = li_std_string.test_reference_inout("hello")
 if s != "hellohello":
   raise RuntimeError
+
+
+if li_std_string.empty() != "":
+  raise RuntimeError
+  
+
+if li_std_string.c_empty() != "":
+  raise RuntimeError
+
+if li_std_string.c_null() != None:
+  raise RuntimeError

Examples/test-suite/ruby/li_std_string_runme.rb

@@ -111,3 +111,23 @@ s = test_reference_inout("hello")
 if (s != "hellohello")
   raise RuntimeError
 end
+
+
+if (empty() != "")
+  raise RuntimeError
+end
+
+if (c_empty() != "") 
+  raise RuntimeError
+end
+
+
+if (c_null() != nil) 
+  raise RuntimeError
+end
+
+
+if (get_null(c_null()) != nil) 
+  raise RuntimeError
+end
+

Lib/perl5/perlstrings.swg

@@ -43,8 +43,8 @@ SWIGINTERNINLINE SV *
 SWIG_FromCharPtrAndSize(const char* carray, size_t size)
 {
   SV *obj = sv_newmortal();
-  if (size && carray) {
-    if (carray[size - 1] == 0) {
+  if (carray) {
+    if (size && (carray[size - 1] == 0)) {
       sv_setpv(obj, carray);
     } else {
       char *tmp = %new_array(size + 1, char);

Lib/typemaps/std_strings.swg

@@ -43,7 +43,7 @@ SWIG_From_dec(String)(const String& s)
   if (s.size()) {
     return SWIG_FromCharPtrAndSize(s.data(), s.size());
   } else {
-    return SWIG_FromCharPtrAndSize(s.c_str(), 1);
+    return SWIG_FromCharPtrAndSize(s.c_str(), 0);
   }
 }
 }