Fix return value of wxMBConvUTF8::ToWChar() when not using MAP_INVALID_UTF8_NOT.

wxMBConvUTF8::ToWChar() was off by 1 when the input length was explicitly
specified, the extra NUL should only be added in the implicit length case.

This bug didn't occur for the default wxMBConvUTF8 object as it simply
forwarded to the base class wxMBConvStrictUTF8 implementation but it happened
when MAP_INVALID_UTF8_TO_OCTAL or MAP_INVALID_UTF8_TO_PUA was used.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68694 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index 170ad719bdbd0380c6d06b8de8cf8aaedb37e9d6..9c6299a5d3f4e7762b8536c3d6ad56ca0def812e 100644 (file)
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -1230,7 +1230,10 @@ size_t wxMBConvUTF8::ToWChar(wchar_t *buf, size_t n,
 
     size_t len = 0;
 
-    while ((srcLen == wxNO_LEN ? *psz : srcLen--) && ((!buf) || (len < n)))
+    // The length can be either given explicitly or computed implicitly for the
+    // NUL-terminated strings.
+    const bool isNulTerminated = srcLen == wxNO_LEN;
+    while ((isNulTerminated ? *psz : srcLen--) && ((!buf) || (len < n)))
     {
         const char *opsz = psz;
         bool invalid = false;
@@ -1364,10 +1367,17 @@ size_t wxMBConvUTF8::ToWChar(wchar_t *buf, size_t n,
         }
     }
 
-    if (srcLen == wxNO_LEN && buf && (len < n))
-        *buf = 0;
+    if ( isNulTerminated )
+    {
+        // Add the trailing NUL in this case if we have a large enough buffer.
+        if ( buf && (len < n) )
+            *buf = 0;
 
-    return len + 1;
+        // And count it in any case.
+        len++;
+    }
+
+    return len;
 }
 
 static inline bool isoctal(wchar_t wch)