[PATCH v2 1/1] vbscript: Map known HRESULT values into their FACILITY_VBS counterparts.

[Kevin Puetz]

From: Kevin Puetz

Unless the callee provided its own Description (e.g. via SetErrorInfo)
VBscript maps certain well-known HRESULT values into its own error facility
and messages, changing Err.Number and also setting Err.Source to itself
(unless already provided, in which case it is left alone)

e.g. if the invoked method returns E_NOINTERFACE,
The VBScript Err object should show

Err.Number: 0x1AE
    Err.Source: Microsoft VBScript runtime error
    Err.Description: Class doesn't support Automation

Rather than the original HRESULT

Err.Number: 0x80004002
---
 dlls/vbscript/vbdisp.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dlls/vbscript/vbdisp.c b/dlls/vbscript/vbdisp.c
index 1c6f68255bd..ae4f3aaf783 100644
--- a/dlls/vbscript/vbdisp.c
+++ b/dlls/vbscript/vbdisp.c
@@ -1654,6 +1654,15 @@ HRESULT disp_call(script_ctx_t *ctx, IDispatch *disp, DISPID id, DISPPARAMS *dp,
     if(hres == DISP_E_EXCEPTION) {
         clear_ei(&ctx->ei);
         ctx->ei = ei;
+        if(!ctx->ei.bstrDescription) {
+            ctx->ei.scode = hres = map_hres(ei.scode);
+            if(HRESULT_FACILITY(hres) == FACILITY_VBS) {
+                ctx->ei.bstrDescription = get_vbscript_error_string(hres);
+                if(!ctx->ei.bstrSource) {
+                    ctx->ei.bstrSource = get_vbscript_string(VBS_RUNTIME_ERROR);
+                }
+            }
+        }
         hres = SCRIPT_E_RECORDED;
     }
     return hres;