Handle when XFA parser error handlers cannot format error messages.

Limit the length of error messages to avoid string formatting failure.
Simplify some CXFA_FMParse error handling code too.

BUG=chromium:708428

Change-Id: I2f5fdb61349a90b3ba681dcc04a26ce0d7f2bdda
Reviewed-on: https://pdfium-review.googlesource.com/5331
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/xfa/fxfa/fm2js/xfa_error.cpp b/xfa/fxfa/fm2js/xfa_error.cpp
index ea0511a89a..5a76d614d1 100644
--- a/xfa/fxfa/fm2js/xfa_error.cpp
+++ b/xfa/fxfa/fm2js/xfa_error.cpp
@@ -9,10 +9,10 @@
 const wchar_t kFMErrUnsupportedChar[] = L"unsupported char '%c'";
 const wchar_t kFMErrBadSuffixNumber[] = L"bad suffix on number";
 const wchar_t kFMErrExpectedIdentifier[] =
-    L"expected identifier instead of '%s'";
-const wchar_t kFMErrExpectedToken[] = L"expected '%s' instead of '%s'";
-const wchar_t kFMErrExpectedEndIf[] = L"expected 'endif' instead of '%s'";
-const wchar_t kFMErrUnexpectedExpression[] = L"unexpected expression '%s'";
+    L"expected identifier instead of '%.16s'";
+const wchar_t kFMErrExpectedToken[] = L"expected '%.16s' instead of '%.16s'";
+const wchar_t kFMErrExpectedEndIf[] = L"expected 'endif' instead of '%.16s'";
+const wchar_t kFMErrUnexpectedExpression[] = L"unexpected expression '%.16s'";
 const wchar_t kFMErrExpectedNonEmptyExpression[] =
     L"expected non-empty expression";
 const wchar_t kFMErrLongAssignmentChain[] =