vbscript: Support VT_BSTR in stack_pop_bool.

dlls/vbscript/interp.c

@@ -417,6 +417,7 @@ static int stack_pop_bool(exec_ctx_t *ctx, BOOL *b)
 {
     variant_val_t val;
     HRESULT hres;
+    VARIANT_BOOL vb;
 
     hres = stack_pop_val(ctx, &val);
     if(FAILED(hres))
@@ -437,6 +438,12 @@ static int stack_pop_bool(exec_ctx_t *ctx, BOOL *b)
     case VT_I4:
         *b = V_I4(val.v);
         break;
+    case VT_BSTR:
+        hres = VarBoolFromStr(V_BSTR(val.v), ctx->script->lcid, 0, &vb);
+        if(FAILED(hres))
+            return hres;
+        *b=vb;
+        break;
     default:
         FIXME("unsupported for %s\n", debugstr_variant(val.v));
         release_val(&val);

dlls/vbscript/tests/lang.vbs

@@ -358,6 +358,22 @@ while empty
 wend
 
 x = 0
+if "0" then
+   ok false, "if ""0"" executed"
+else
+   x = 1
+end if
+Call ok(x = 1, "if ""0"" else not executed")
+
+x = 0
+if "-1" then
+   x = 1
+else
+   ok false, "if ""-1"" else executed"
+end if
+Call ok(x = 1, "if ""-1"" not executed")
+
+x = 0
 WHILE x < 3 : x = x + 1 : Wend
 Call ok(x = 3, "x not equal to 3")