**********************************

* String Length: find length of null terminated string.
*  note:null NOT included in count.

* ENTRY: X=start of string

* EXIT: D=length
*       all other regs (except cc) preserved

 nam Find String Length
 ttl Assembler Library Module


 section .text

STRLEN:
 pshs x
 ldd #-1 comp for inital inc

loop
 addd #1 bump count
 tst ,x+ end?
 bne loop

 puls x,pc

 endsect