[PATCH v3 4/6] xmllite/writer: Improve error handling in WriteWhitespace().

[Nikolay Sivov]

From: Nikolay Sivov

Signed-off-by: Nikolay Sivov 
---
 dlls/xmllite/writer.c | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/dlls/xmllite/writer.c b/dlls/xmllite/writer.c
index 83fc98d48c9..17362fe85ca 100644
--- a/dlls/xmllite/writer.c
+++ b/dlls/xmllite/writer.c
@@ -386,6 +386,26 @@ static BOOL is_valid_nmtoken(const WCHAR *str, unsigned int *out)
     return TRUE;
 }

+static BOOL is_valid_whitespace(const WCHAR *str, unsigned int *out)
+{
+    unsigned int len = 0;
+
+    *out = 0;
+
+    while (is_wchar_space(*str))
+    {
+        str++;
+        len++;
+    }
+
+    if (*str)
+        return FALSE;
+
+    *out = len;
+
+    return TRUE;
+}
+
 static HRESULT is_valid_name(const WCHAR *str, unsigned int *out)
 {
     unsigned int len = 1;
@@ -2051,7 +2071,8 @@ static HRESULT WINAPI xmlwriter_WriteSurrogateCharEntity(IXmlWriter *iface, WCHA
 static HRESULT WINAPI xmlwriter_WriteWhitespace(IXmlWriter *iface, LPCWSTR text)
 {
     xmlwriter *writer = impl_from_IXmlWriter(iface);
-    size_t length = 0;
+    unsigned int length = 0;
+    HRESULT hr = S_OK;

TRACE("%p, %s.\n", iface, wine_dbgstr_w(text));

@@ -2060,7 +2081,7 @@ static HRESULT WINAPI xmlwriter_WriteWhitespace(IXmlWriter *iface, LPCWSTR text)
     case XmlWriterState_Initial:
         return E_UNEXPECTED;
     case XmlWriterState_ElemStarted:
-        writer_close_starttag(writer);
+        hr = writer_close_starttag(writer);
         break;
     case XmlWriterState_InvalidEncoding:
         return MX_E_ENCODING;
@@ -2075,9 +2096,10 @@ static HRESULT WINAPI xmlwriter_WriteWhitespace(IXmlWriter *iface, LPCWSTR text)
         if (!is_wchar_space(text[length])) return WR_E_NONWHITESPACE;
         length++;
     }
+    if (SUCCEEDED(hr) && !is_valid_whitespace(text, &length))
+        hr = WR_E_NONWHITESPACE;

-    write_output_buffer(writer->output, text, length);
-    return S_OK;
+    return write_output(writer, text, length, &hr);
 }

static HRESULT WINAPI xmlwriter_Flush(IXmlWriter *iface)