Determine if a token is alphanumeric

Declared in file: hzTextproc.h
Defined in file : hzTypes.cpp

Function Logic:

Function body:

bool IsAlphaNum (const char* tok)
{
   //  Category: Text Processing
   //  
   //  Determine if a token is alphanumeric
   //  
   //  Arguments: 1) tok The token
   //  
   //  Returns: True If token is alphanemeric
   //     False If string of zero length or contains non alphanumeric chars
   _hzfunc("IsAlphaNum") ;
   const char* i ;     //  Input string iterator
   if (!tok || !tok[0])
       return false ;
   for (i = tok ; *i ; i++)
   {
       if (chartype[*i] & (CTYPE_ALPHA | CTYPE_DIGIT))
           continue ;
       return false ;
   }
   return true ;
}