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MODULE STRING(                      ! General-purpose string-handling functions
              IDENT='1',
              ENTRY(MOVEAZ, FSUBAZ)
              ) =
BEGIN
!  COPYRIGHT (C) DIGITAL EQUIPMENT CORPORATION 1982, 1986.
!  ALL RIGHTS RESERVED.
!  
!  THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY  BE  USED  AND
!  COPIED ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH
!  THE INCLUSION OF THE ABOVE COPYRIGHT NOTICE.   THIS  SOFTWARE  OR
!  ANY  OTHER  COPIES  THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE
!  AVAILABLE TO ANY OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF  THE
!  SOFTWARE IS HEREBY TRANSFERRED.
!  
!  THE INFORMATION IN THIS SOFTWARE IS  SUBJECT  TO  CHANGE  WITHOUT
!  NOTICE  AND  SHOULD  NOT  BE CONSTRUED AS A COMMITMENT BY DIGITAL
!  EQUIPMENT CORPORATION.
!  
!  DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR  RELIABILITY  OF
!  ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.

!++
! FACILITY: RMS
!
! ABSTRACT:
!          ASCIZ string manipulation
!
! ENVIRONMENT: Transportable
!
! AUTHOR: Andrew Nourse

!
! Table of Contents
!

FORWARD ROUTINE
MOVEAZ,
FSUBAZ;

GLOBAL ROUTINE MOVEAZ(SPTR,DPTR)=
!Copy an ASCIZ string
!SPTR: ADDRESS OF source byte pointer (returned untouched)
!DPTR: ADDRESS OF destination byte pointer (returned updated)
!Returns length of string
BEGIN

LOCAL SP;
LOCAL C;	!Character we just read

SP=..SPTR;	!Make a copy of source pointer

INCR LEN FROM 0 BY 1 DO
	BEGIN
	IF (C=CH$RCHAR_A(SP)) EQL 0 THEN
		(CH$WCHAR(0,..DPTR); RETURN .LEN);
		!Make ASCIZ string of dest, but don't bump DPTR past null byte
	CH$WCHAR_A(.C,.DPTR)
	END;
END;	!MOVEAZ

GLOBAL ROUTINE FSUBAZ(TARGET,PATTERN)=
BEGIN
LOCAL
      F,                                ! FIRST PATTERN CHARACTER
      TPATTERN;                         ! CURRENT PATTERN POINTER

TPATTERN=.PATTERN;
F=CH$RCHAR_A(TPATTERN);

DO    BEGIN
      SELECT CH$RCHAR(.TARGET) OF
      SET
      [.F]: BEGIN
            LOCAL TTPATTERN;            ! Current Pattern pointer
            LOCAL TTARGET,              ! Current Target pointer
                  P;                    ! Current Pattern character 
            TTPATTERN=.TPATTERN;        ! 
            TTARGET=.TARGET;
            CH$RCHAR_A(TTARGET);
            WHILE (P=CH$RCHAR_A(TTPATTERN)) EQL CH$RCHAR_A(TTARGET)
             DO (IF .P EQL 0 THEN EXITLOOP);
            IF .P EQL 0 THEN RETURN .TARGET; ! End of Pattern -- MATCH
            TTPATTERN=.TPATTERN;        ! Reset to start of pattern
            END;                        
      [0]: RETURN 0;                    ! No match
      TES;
      CH$RCHAR_A(TARGET);  ! Not yet
      END WHILE 1;            
END;

END ELUDOM