	SUBROUTINE LEFT_JUST( source, dest, tlen )

*
*
*  This software was developed by the Thermal Modeling and Analysis
*  Project(TMAP) of the National Oceanographic and Atmospheric
*  Administration's (NOAA) Pacific Marine Environmental Lab(PMEL),
*  hereafter referred to as NOAA/PMEL/TMAP.
*
*  Access and use of this software shall impose the following
*  obligations and understandings on the user. The user is granted the
*  right, without any fee or cost, to use, copy, modify, alter, enhance
*  and distribute this software, and any derivative works thereof, and
*  its supporting documentation for any purpose whatsoever, provided
*  that this entire notice appears in all copies of the software,
*  derivative works and supporting documentation.  Further, the user
*  agrees to credit NOAA/PMEL/TMAP in any publications that result from
*  the use of this software or in any product that includes this
*  software. The names TMAP, NOAA and/or PMEL, however, may not be used
*  in any advertising or publicity to endorse or promote any products
*  or commercial entity unless specific written permission is obtained
*  from NOAA/PMEL/TMAP. The user also understands that NOAA/PMEL/TMAP
*  is not obligated to provide the user with any support, consulting,
*  training or assistance of any kind with regard to the use, operation
*  and performance of this software nor to provide the user with any
*  updates, revisions, new versions or "bug fixes".
*
*  THIS SOFTWARE IS PROVIDED BY NOAA/PMEL/TMAP "AS IS" AND ANY EXPRESS
*  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  ARE DISCLAIMED. IN NO EVENT SHALL NOAA/PMEL/TMAP BE LIABLE FOR ANY SPECIAL,
*  INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
*  RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
*  CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION, ARISING OUT OF OR IN
*  CONNECTION WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE. 
*
*
* left justify a source string into a dest blank-filling the remainder

* programmer - steve hankin
* NOAA/PMEL, Seattle, WA - Tropical Modeling and Analysis Program
* written in transportable FORTRAN 77

* revision 0.0 - 7/13/87
* revision 0.1 - 8/21/88 - returned length is measured to last non-blank
* V510 *sh* 3/00 - skip leading tabs as well as blanks
* 1/03 *kob* - g77 port - g77 won't allow intrinsic functions in PARAMETER
*                         statements.  use and octal initialization instead


* calling argument declarations:
	CHARACTER*(*) source, dest
	INTEGER	tlen

* internal variable declarations:
	INTEGER	TM_LENSTR1, slen, dlen, first

* internal parameter declarations
	CHARACTER*1 tab
#ifdef NO_INTRINSIC_IN_PARAMETER
	PARAMETER     ( tab = o'011' )
#else
	PARAMETER     ( tab = CHAR(9))
#endif

* how long are the strings ?
	slen = LEN( source )
	dlen = LEN( dest   )

* find left-most non-blank
	DO 100 first = 1, slen
	   IF ( source(first:first) .NE. ' '
     .	  .AND. source(first:first) .NE. tab ) GOTO 200
 100	CONTINUE
	first = slen

* insert left-justified string
 200	dest = source( first:slen )

* measure its length
	tlen = TM_LENSTR1( dest )

	RETURN

	END
