modi_gltools_strlower.F90

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! =======================================================================
! ====================== MODULE modi_gltools_strlower =====================
! =======================================================================
!
! Goal:
! ------
!   If an uppercase string is given to this routine, it returns it in
! lowercase.
!
! Created:
! ---------
!   07/2010 (D. Salas, Meteo-France)
!
! Modified:
! ----------
!   No.
!
! ------------------- BEGIN MODULE modi_gltools_strlower ------------------
!
!THXS_SFX!MODULE modi_gltools_strlower
!THXS_SFX!INTERFACE
!THXS_SFX!!
!THXS_SFX!FUNCTION gltools_strlower( hstring ) RESULT(hresult)
!THXS_SFX!  CHARACTER(LEN=*), INTENT(in) ::  &
!THXS_SFX!    hstring
!THXS_SFX!  CHARACTER(LEN=LEN(hstring)) ::  &
!THXS_SFX!    hresult
!THXS_SFX!END FUNCTION gltools_strlower
!THXS_SFX!!
!THXS_SFX!END INTERFACE
!THXS_SFX!END MODULE modi_gltools_strlower
!
! ------------------- END MODULE modi_gltools_strlower ------------------
!
!
! ---------------------------------------------------------------------
! ------------------------- FUNCTION gltools_strlower -------------------------
! 
FUNCTION gltools_strlower( hstring ) RESULT(hresult)
!
  IMPLICIT NONE
!
  CHARACTER(LEN=*), INTENT(in) ::  &
    hstring
  CHARACTER(LEN=LEN(hstring)) ::  &
    hresult
!
  INTEGER ::  &
    ic,ji
!
!
!* Note that characters from A to Z have a code between 65 and 90, and 
! characters from a to z have a code between 97 and 122.
! (so a conversion from uppercase to lowercase amounts to adding 32 to
! the character code)
!
  DO ji = 1,len(hstring)
    ic = ichar( hstring(ji:ji) )
    IF ( ic>=65 .AND. ic<=90 ) THEN
        hresult(ji:ji) = char(ic+32)
      ELSE
        hresult(ji:ji) = char(ic)
    ENDIF
  END DO
!
END FUNCTION gltools_strlower
!
! ----------------------- END FUNCTION gltools_strlower -----------------------
! ---------------------------------------------------------------------