psblas3/ext/impl/psb_c_dia_csgetptn.f90

!                Parallel Sparse BLAS   GPU plugin 
!      (C) Copyright 2013
!  
!                         Salvatore Filippone
!                         Alessandro Fanfarillo
!   
!    Redistribution and use in source and binary forms, with or without
!    modification, are permitted provided that the following conditions
!    are met:
!      1. Redistributions of source code must retain the above copyright
!         notice, this list of conditions and the following disclaimer.
!      2. Redistributions in binary form must reproduce the above copyright
!         notice, this list of conditions, and the following disclaimer in the
!         documentation and/or other materials provided with the distribution.
!      3. The name of the PSBLAS group or the names of its contributors may
!         not be used to endorse or promote products derived from this
!         software without specific written permission.
!   
!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!   
  

subroutine psb_c_dia_csgetptn(imin,imax,a,nz,ia,ja,info,&
     & jmin,jmax,iren,append,nzin,rscale,cscale)
  use psb_base_mod
  use psb_c_dia_mat_mod, psb_protect_name => psb_c_dia_csgetptn
  implicit none

  class(psb_c_dia_sparse_mat), intent(in)       :: a 
  integer(psb_ipk_), intent(in)                 :: imin,imax
  integer(psb_ipk_), intent(out)                :: nz
  integer(psb_ipk_), allocatable, intent(inout) :: ia(:), ja(:)
  integer(psb_ipk_),intent(out)                 :: info
  logical, intent(in), optional                 :: append
  integer(psb_ipk_), intent(in), optional       :: iren(:)
  integer(psb_ipk_), intent(in), optional       :: jmin,jmax, nzin
  logical, intent(in), optional                 :: rscale,cscale

  logical :: append_, rscale_, cscale_ 
  integer(psb_ipk_) :: nzin_, jmin_, jmax_, err_act, i
  character(len=20)  :: name='dia_getptn'
  logical, parameter :: debug=.false.

  call psb_erractionsave(err_act)
  info = psb_success_

  if (present(jmin)) then
    jmin_ = jmin
  else
    jmin_ = 1
  endif
  if (present(jmax)) then
    jmax_ = jmax
  else
    jmax_ = a%get_ncols()
  endif

  if ((imax<imin).or.(jmax_<jmin_)) then 
    nz = 0
    return
  end if

  if (present(append)) then
    append_=append
  else
    append_=.false.
  endif
  if ((append_).and.(present(nzin))) then 
    nzin_ = nzin
  else
    nzin_ = 0
  endif
  if (present(rscale)) then 
    rscale_ = rscale
  else
    rscale_ = .false.
  endif
  if (present(cscale)) then 
    cscale_ = cscale
  else
    cscale_ = .false.
  endif
  if ((rscale_.or.cscale_).and.(present(iren))) then 
    info = psb_err_many_optional_arg_
    call psb_errpush(info,name,a_err='iren (rscale.or.cscale)')
    goto 9999
  end if
  if (a%is_dev()) call a%sync()

  call dia_getptn(imin,imax,jmin_,jmax_,a,nz,ia,ja,nzin_,append_,info,iren)

  if (info /= psb_success_) goto 9999
  
  if (rscale_) then 
    do i=nzin_+1, nzin_+nz
      ia(i) = ia(i) - imin + 1
    end do
  end if
  if (cscale_) then 
    do i=nzin_+1, nzin_+nz
      ja(i) = ja(i) - jmin_ + 1
    end do
  end if


  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)
  return

contains

  subroutine dia_getptn(imin,imax,jmin,jmax,a,nz,ia,ja,nzin,append,info,&
       & iren)
    implicit none
    class(psb_c_dia_sparse_mat), intent(in)     :: a
    integer(psb_ipk_)                             :: imin,imax,jmin,jmax
    integer(psb_ipk_), intent(out)                :: nz
    integer(psb_ipk_), allocatable, intent(inout) :: ia(:), ja(:)
    integer(psb_ipk_), intent(in)                 :: nzin
    logical, intent(in)                           :: append
    integer(psb_ipk_)                             :: info
    integer(psb_ipk_), optional                   :: iren(:)
    integer(psb_ipk_)  :: nzin_, nza, idx,i,j,k, nzt, irw, lrw,&
         & ir, jc, m4, ir1, ir2, nzc, nr, nc
    integer(psb_ipk_)  :: debug_level, debug_unit
    character(len=20) :: name='dia_getptn'

    debug_unit  = psb_get_debug_unit()
    debug_level = psb_get_debug_level()
    nza = a%get_nzeros()
    irw = imin
    lrw = min(imax,a%get_nrows())
    if (irw<0) then 
      info = psb_err_pivot_too_small_
      return
    end if

    if (append) then 
      nzin_ = nzin
    else
      nzin_ = 0
    endif
    nz = 0 
    
    nr = size(a%data,1)
    nc = size(a%data,2)
    do j=1,nc
      jc = a%offset(j)
      if (jc > 0) then 
        ir1 = 1
        ir2 = nr - jc
      else
        ir1 = 1 - jc
        ir2 = nr
      end if
      ir1 = max(irw,ir1)
      ir1 = max(ir1,jmin-jc)
      ir2 = min(lrw,ir2)
      ir2 = min(ir2,jmax-jc)
      nzc = ir2-ir1+1
      if (nzc>0) then 
        call psb_ensure_size(nzin_+nzc,ia,info)
        if (info == 0) call psb_ensure_size(nzin_+nzc,ja,info)
        do i=ir1, ir2
          nzin_ = nzin_ + 1
          nz    = nz + 1
          ia(nzin_)  = i
          ja(nzin_)  = i+jc
        enddo
      end if
    enddo
    
    
  end subroutine dia_getptn

end subroutine psb_c_dia_csgetptn