Update libexpat to 2.1.0

third_party/expat/files/lib/xmltok_impl.c

 /* Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
    See the file COPYING for copying permission.
 */
 
 /* This file is included! */
 #ifdef XML_TOK_IMPL_C
 
 #ifndef IS_INVALID_CHAR
 #define IS_INVALID_CHAR(enc, ptr, n) (0)
 #endif
@@ skipping 867 matching lines @@
   return XML_TOK_DATA_CHARS;
 }
 
 /* ptr points to character following "%" */
 
 static int PTRCALL
 PREFIX(scanPercent)(const ENCODING *enc, const char *ptr, const char *end,
                     const char **nextTokPtr)
 {
   if (ptr == end)
-    return -XML_TOK_PERCENT;
+    return XML_TOK_PARTIAL;
   switch (BYTE_TYPE(enc, ptr)) {
   CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
   case BT_S: case BT_LF: case BT_CR: case BT_PERCNT:
     *nextTokPtr = ptr;
     return XML_TOK_PERCENT;
   default:
     *nextTokPtr = ptr;
     return XML_TOK_INVALID;
   }
   while (ptr != end) {
@@ skipping 838 matching lines @@
     }
   }
 }
 
 static void PTRCALL
 PREFIX(updatePosition)(const ENCODING *enc,
                        const char *ptr,
                        const char *end,
                        POSITION *pos)
 {
-  while (ptr != end) {
+  while (ptr < end) {
     switch (BYTE_TYPE(enc, ptr)) {
 #define LEAD_CASE(n) \
     case BT_LEAD ## n: \
       if (end - ptr < n) { \

[rlarocque, 2013/12/17 21:35:36]

It seems we added this early return statement to fix a bug.  The change on line
1747 is the upstream fix to that same bug.  I think we can undo our local
modification as we pull in the upstream fix.  

See http://sourceforge.net/p/expat/bugs/464/.

-        return; \
+          return; \
       } \
       ptr += n; \
       break;
     LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
 #undef LEAD_CASE
     case BT_LF:
       pos->columnNumber = (XML_Size)-1;
       pos->lineNumber++;
       ptr += MINBPC(enc);
       break;
@@ skipping 14 matching lines @@
 
 #undef DO_LEAD_CASE
 #undef MULTIBYTE_CASES
 #undef INVALID_CASES
 #undef CHECK_NAME_CASE
 #undef CHECK_NAME_CASES
 #undef CHECK_NMSTRT_CASE
 #undef CHECK_NMSTRT_CASES
 
 #endif /* XML_TOK_IMPL_C */