regedit: Fix editing and exporting of zero-size strings.

programs/regedit/edit.c

@@ -224,7 +224,7 @@ static LPTSTR read_value(HWND hwnd, HKEY hKey, LPCTSTR valueName, DWORD *lpType,
         goto done;
     }
     if ( *lpType == REG_DWORD ) valueDataLen = sizeof(DWORD);
-    if (!(buffer = HeapAlloc(GetProcessHeap(), 0, valueDataLen))) {
+    if (!(buffer = HeapAlloc(GetProcessHeap(), 0, valueDataLen+1))) {
         error(hwnd, IDS_TOO_BIG_VALUE, valueDataLen);
         goto done;
     }
@@ -233,7 +233,7 @@ static LPTSTR read_value(HWND hwnd, HKEY hKey, LPCTSTR valueName, DWORD *lpType,
         error(hwnd, IDS_BAD_VALUE, valueName);
         goto done;
     }
-
+    buffer[valueDataLen] = 0;
     if(len) *len = valueDataLen;
     return buffer;
 

programs/regedit/regproc.c

@@ -764,7 +764,7 @@ static void export_hkey(FILE *file, HKEY key,
             case REG_SZ:
             case REG_EXPAND_SZ:
                 fputs("\"", file);
-                REGPROC_export_string(file, (char*) *val_buf);
+                if (val_size1) REGPROC_export_string(file, (char*) *val_buf);
                 fputs("\"\n", file);
                 break;