gdncvardelattr.f90

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!> @file gdncvardelattr.f90
!>
!> @author GFD Dennou Club
!> @copyright Copyright (C) GFD Dennou Club, 2000-2026. All rights reserved. <br/>
!>            License is BSD-2-Clause. See [COPYRIGHT](@ref COPYRIGHT) in detail
!>
!> @en
!> @brief Delete an attribute from a netCDF variable
!> @enden
!>
!> @ja
!> @brief netCDF 変数から属性を削除
!> @endja
!>
 
!>
!> @en
!> @brief Delete a named attribute
!>
!> Removes an attribute from a variable. If the name starts with '+',
!> the attribute is treated as a global attribute.
!> @enden
!>
!> @ja
!> @brief 指定された属性を削除
!>
!> 変数から属性を削除します。名前が '+' で始まる場合、
!> グローバル属性として扱われます。
!> @endja
!>
!> @param[in]  var  @en Variable handle @enden @ja 変数ハンドル @endja
!> @param[in]  name @en Attribute name @enden @ja 属性名 @endja
!> @param[out] err  @en Error flag (optional) @enden @ja エラーフラグ (省略可能) @endja
!>
subroutine gdncvardelattr(var, name, err)
    use gtdata_netcdf_types, only: gd_nc_variable, gd_nc_variable_entry
    use gtdata_netcdf_file_generic, only: gdncfiledefinemode
    use gtdata_netcdf_internal, only: vtable_lookup
    use netcdf, only: nf90_noerr, nf90_del_att, nf90_global, nf90_enotindefine
    use dc_url, only: gt_plus
    use dc_error
    implicit none
    type(gd_nc_variable), intent(in):: var
    character(len = *), intent(in):: name
    logical, intent(out), optional:: err
    type(gd_nc_variable_entry):: ent
    integer:: stat
continue
    stat = vtable_lookup(var, ent)
    if (stat /= nf90_noerr) goto 999
    stat = nf90_del_att(ent%fileid, ent%varid, name=name)
    if (stat == 0) goto 999
    if (stat /= nf90_enotindefine) goto 999
    stat = gdncfiledefinemode(ent%fileid)
    if (stat /= nf90_noerr) goto 999
    if (name(1:1) == gt_plus) then
        stat = nf90_del_att(ent%fileid, nf90_global, name=name(2:))
    else
        stat = nf90_del_att(ent%fileid, ent%varid, name=name)
    endif
 
999 continue
    call storeerror(stat, 'GDNcVarPutAttrChar', err)
end subroutine