;-------------------------------------------------------------
;+
; NAME:
;       MPUTFILE
; PURPOSE:
;       Write a text file from a string array.
; CATEGORY:
; CALLING SEQUENCE:
;       mputfile, f, s
; INPUTS:
;       f = text file name.      in
;       s = string array.        in
; KEYWORD PARAMETERS:
;       Keywords:
;         ERROR=err  error flag: 0=ok, 1=invalid string array.
; OUTPUTS:
; COMMON BLOCKS:
; NOTES:
; MODIFICATION HISTORY:
;       R. Sterner, 20 Mar, 1990
;       R. Sterner,  4 Nov, 1992 --- allowed scalar strings.
;
; Copyright (C) 1990, Johns Hopkins University/Applied Physics Laboratory
; This software may be used, copied, or redistributed as long as it is not
; sold and this copyright notice is reproduced on each copy made.  This
; routine is provided as is without any express or implied warranties
; whatsoever.  Other limitations apply as described in the file disclaimer.txt.
;-
;-------------------------------------------------------------
 
	pro mputfile, file, s, error=err, help=hlp
 
	if (n_params(0) lt 1) or keyword_set(hlp) then begin
	  print,' Write a text file from a string array.'
	  print,' mputfile, f, s'
	  print,'   f = text file name.      in'
	  print,'   s = string array.        in'
	  print,' Keywords:'
	  print,'   ERROR=err  error flag: 0=ok, 1=invalid string array.'
	  return
	endif
 
	if datatype(s) ne 'STR' then begin
	  print,' Error in mputfile: argument must be a string array.'
	  err = 1
	  return
	endif
 
	get_lun, lun
	openw, lun, file
 
	for i = 0L, n_elements(s)-1 do begin
	  t = s(i)
	  if t eq '' then t = ' '
	  printf, lun, t
	endfor
 
	close, lun
	free_lun, lun
	err = 0
	return
 
	end