issue #6917 Crash in php with UTF-8 character

Problem is that a value is fed to isspace that is not in the correct range and has to be converted to this range.

compare also Assertion failure generation documentation (fdefe70 of March 30 2016).

src/util.cpp

@@ -1869,7 +1869,7 @@ QCString removeRedundantWhiteSpace(const QCString &s)
       case '@':  // '@name' -> ' @name'
       case '$':  // '$name' -> ' $name'
       case '\'': // ''name' -> '' name'
-        if (i>0 && i<l-1 && pc!='=' && pc!=':' && !isspace(pc) &&
+        if (i>0 && i<l-1 && pc!='=' && pc!=':' && !isspace((uchar)pc) &&
             isId(nc) && osp<8) // ")id" -> ") id"
         {
           *dst++=' ';
@@ -1913,14 +1913,14 @@ QCString removeRedundantWhiteSpace(const QCString &s)
       default:
         *dst++=c;
         if (c=='t' && csp==5 && i<l-1 && // found 't' in 'const'
-             !(isId(nc) || nc==')' || nc==',' || isspace(nc))
+             !(isId(nc) || nc==')' || nc==',' || isspace((uchar)nc))
            ) // prevent const ::A from being converted to const::A
         {
           *dst++=' ';
           csp=0;
         }
         else if (c=='l' && vsp==7 && i<l-1 && // found 'l' in 'virtual'
-             !(isId(nc) || nc==')' || nc==',' || isspace(nc))
+             !(isId(nc) || nc==')' || nc==',' || isspace((uchar)nc))
             ) // prevent virtual ::A from being converted to virtual::A
         {
           *dst++=' ';
@@ -7200,7 +7200,7 @@ bool findAndRemoveWord(QCString &s,const QCString &word)
     {
       if (i>0 && isspace((uchar)s.at(i-1))) 
         i--,l++;
-      else if (i+l<(int)s.length() && isspace(s.at(i+l))) 
+      else if (i+l<(int)s.length() && isspace((uchar)s.at(i+l)))
         l++;
       s = s.left(i)+s.mid(i+l); // remove word + spacing
       return TRUE;