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__PARCLEN          Return length of character string


Syntax Usage:  . To obtain length of a string parameter:

                   mov   ax, <ORDER>
                   push  ax
                   call  __PARCLEN
                   add   sp, 2

               . To obtain length of a string element from an array
                 parameter:

                   mov   ax, <ORDER>
                   mov   bx, <INDEX>
                   push  bx
                   push  ax
                   call  __PARCLEN
                   add   sp, 4

Arguments:     <ORDER> is the placement order in the parameter list.
               <INDEX> is the index of the array element to be accessed.

Description:   __PARCLEN returns the length of a given string in AX.  It
               is used primarily with respect to CHR(0).  This has two
               uses:

               . Check for the length of a string with embedded CHR(0)s
                 in it.

               . Get the length of a string without counting the null
                 terminator.