Merge the fix for NSPR bug 689188.

base/third_party/nspr/prtime.cc

 /* Portions are Copyright (C) 2011 Google Inc */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 1025 matching lines @@
         SKIP_MORE:
           while (*rest &&
                          (*rest == ' ' || *rest == '\t' ||
                           *rest == ',' || *rest == ';' || *rest == '/' ||
                           *rest == '(' || *rest == ')' || *rest == '[' || *rest == ']'))
                 rest++;
 
           /* "-" is ignored at the beginning of a token if we have not yet
                  parsed a year (e.g., the second "-" in "30-AUG-1966"), or if
                  the character after the dash is not a digit. */         
-          if (*rest == '-' && ((rest > string && isalpha(rest[-1]) && year < 0)
-              || rest[1] < '0' || rest[1] > '9'))
+          if (*rest == '-' && ((rest > string &&
+              isalpha((unsigned char)rest[-1]) && year < 0) ||
+              rest[1] < '0' || rest[1] > '9'))
                 {
                   rest++;
                   goto SKIP_MORE;
                 }
 
         }
 
   if (zone != TT_UNKNOWN && zone_offset == -1)
         {
           switch (zone)
@@ skipping 142 matching lines @@
                               + 60 * localTime.tm_hour
                               + 1440 * (localTime.tm_mday - 2);
         }
 
   result->tm_params.tp_gmt_offset = zone_offset * 60;
   result->tm_params.tp_dst_offset = dst_offset * 60;
 
   *result_imploded = PR_ImplodeTime(result);
   return PR_SUCCESS;
 }