dnl Checks for libbfio required headers and functions
dnl
dnl Version: 20181117

dnl Function to detect if libbfio is available
dnl ac_libbfio_dummy is used to prevent AC_CHECK_LIB adding unnecessary -l<library> arguments
AC_DEFUN([AX_LIBBFIO_CHECK_LIB],
  [AS_IF(
    [test "x$ac_cv_enable_shared_libs" = xno || test "x$ac_cv_with_libbfio" = xno],
    [ac_cv_libbfio=no],
    [dnl Check if the directory provided as parameter exists
    AS_IF(
      [test "x$ac_cv_with_libbfio" != x && test "x$ac_cv_with_libbfio" != xauto-detect],
      [AS_IF(
        [test -d "$ac_cv_with_libbfio"],
        [CFLAGS="$CFLAGS -I${ac_cv_with_libbfio}/include"
        LDFLAGS="$LDFLAGS -L${ac_cv_with_libbfio}/lib"],
        [AC_MSG_FAILURE(
          [no such directory: $ac_cv_with_libbfio],
          [1])
        ])
        ac_cv_libbfio=check],
      [dnl Check for a pkg-config file
      AS_IF(
        [test "x$cross_compiling" != "xyes" && test "x$PKGCONFIG" != "x"],
        [PKG_CHECK_MODULES(
          [libbfio],
          [libbfio >= 20160108],
          [ac_cv_libbfio=yes],
          [ac_cv_libbfio=check])
        ])
      AS_IF(
        [test "x$ac_cv_libbfio" = xyes && test "x$ac_cv_enable_wide_character_type" != xno],
        [AC_CACHE_CHECK(
         [whether libbfio/features.h defines LIBBFIO_HAVE_WIDE_CHARACTER_TYPE as 1],
         [ac_cv_header_libbfio_features_h_have_wide_character_type],
         [AC_LANG_PUSH(C)
         AC_COMPILE_IFELSE(
           [AC_LANG_PROGRAM(
             [[#include <libbfio/features.h>]],
             [[#if !defined( LIBBFIO_HAVE_WIDE_CHARACTER_TYPE ) || ( LIBBFIO_HAVE_WIDE_CHARACTER_TYPE != 1 )
#error LIBBFIO_HAVE_WIDE_CHARACTER_TYPE not defined
#endif]] )],
           [ac_cv_header_libbfio_features_h_have_wide_character_type=yes],
           [ac_cv_header_libbfio_features_h_have_wide_character_type=no])
         AC_LANG_POP(C)],
         [ac_cv_header_libbfio_features_h_have_wide_character_type=no])

        AS_IF(
          [test "x$ac_cv_header_libbfio_features_h_have_wide_character_type" = xno],
          [ac_cv_libbfio=no])
        ])
      AS_IF(
        [test "x$ac_cv_libbfio" = xyes],
        [ac_cv_libbfio_CPPFLAGS="$pkg_cv_libbfio_CFLAGS"
        ac_cv_libbfio_LIBADD="$pkg_cv_libbfio_LIBS"])
      ])

    AS_IF(
      [test "x$ac_cv_libbfio" = xcheck],
      [dnl Check for headers
      AC_CHECK_HEADERS([libbfio.h])

      AS_IF(
        [test "x$ac_cv_header_libbfio_h" = xno],
        [ac_cv_libbfio=no],
        [dnl Check for the individual functions
        ac_cv_libbfio=yes

        AC_CHECK_LIB(
          bfio,
          libbfio_get_version,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        dnl Handle functions
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_free,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_open,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_close,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_exists,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_read_buffer,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_write_buffer,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_seek_offset,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        AC_CHECK_LIB(
          bfio,
          libbfio_handle_is_open,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_get_offset,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_get_size,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_set_track_offsets_read,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_get_number_of_offsets_read,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_handle_get_offset_read,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        dnl File functions
        AC_CHECK_LIB(
          bfio,
          libbfio_file_initialize,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_file_get_name_size,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_file_get_name,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_file_set_name,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        AS_IF(
          [test "x$ac_cv_enable_wide_character_type" != xno],
          [AC_CHECK_LIB(
            bfio,
            libbfio_file_get_name_size_wide,
            [ac_cv_libbfio_dummy=yes],
            [ac_cv_libbfio=no])
          AC_CHECK_LIB(
            bfio,
            libbfio_file_get_name_wide,
            [ac_cv_libbfio_dummy=yes],
            [ac_cv_libbfio=no])
          AC_CHECK_LIB(
            bfio,
            libbfio_file_set_name_wide,
            [ac_cv_libbfio_dummy=yes],
            [ac_cv_libbfio=no])
          ])

        dnl Pool functions
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_initialize,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_free,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_clone,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        AC_CHECK_LIB(
          bfio,
          libbfio_pool_get_number_of_handles,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_get_handle,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_set_handle,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_append_handle,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_remove_handle,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_get_maximum_number_of_open_handles,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_set_maximum_number_of_open_handles,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        AC_CHECK_LIB(
          bfio,
          libbfio_pool_open,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_reopen,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_close,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_close_all,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_read_buffer,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_write_buffer,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_seek_offset,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_get_offset,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])
        AC_CHECK_LIB(
          bfio,
          libbfio_pool_get_size,
          [ac_cv_libbfio_dummy=yes],
          [ac_cv_libbfio=no])

        ac_cv_libbfio_LIBADD="-lbfio"])
      ])
    AS_IF(
      [test "x$ac_cv_with_libbfio" != x && test "x$ac_cv_with_libbfio" != xauto-detect && test "x$ac_cv_libbfio" != xyes],
      [AC_MSG_FAILURE(
        [unable to find supported libbfio in directory: $ac_cv_with_libbfio],
        [1])
      ])
    ])

  AS_IF(
    [test "x$ac_cv_libbfio" = xyes],
    [AC_DEFINE(
      [HAVE_LIBBFIO],
      [1],
      [Define to 1 if you have the `bfio' library (-lbfio).])
    ])

  AS_IF(
    [test "x$ac_cv_libbfio" = xyes],
    [AC_SUBST(
      [HAVE_LIBBFIO],
      [1]) ],
    [AC_SUBST(
      [HAVE_LIBBFIO],
      [0])
    ])
  ])

dnl Function to detect if libbfio dependencies are available
AC_DEFUN([AX_LIBBFIO_CHECK_LOCAL],
  [dnl No additional checks.

  ac_cv_libbfio_CPPFLAGS="-I../libbfio";
  ac_cv_libbfio_LIBADD="../libbfio/libbfio.la";

  ac_cv_libbfio=local
  ])

dnl Function to detect how to enable libbfio
AC_DEFUN([AX_LIBBFIO_CHECK_ENABLE],
  [AX_COMMON_ARG_WITH(
    [libbfio],
    [libbfio],
    [search for libbfio in includedir and libdir or in the specified DIR, or no if to use local version],
    [auto-detect],
    [DIR])

  dnl Check for a shared library version
  AX_LIBBFIO_CHECK_LIB

  dnl Check if the dependencies for the local library version
  AS_IF(
    [test "x$ac_cv_libbfio" != xyes],
    [AX_LIBBFIO_CHECK_LOCAL

    AC_DEFINE(
      [HAVE_LOCAL_LIBBFIO],
      [1],
      [Define to 1 if the local version of libbfio is used.])
    AC_SUBST(
      [HAVE_LOCAL_LIBBFIO],
      [1])
    ])

  AM_CONDITIONAL(
    [HAVE_LOCAL_LIBBFIO],
    [test "x$ac_cv_libbfio" = xlocal])
  AS_IF(
    [test "x$ac_cv_libbfio_CPPFLAGS" != "x"],
    [AC_SUBST(
      [LIBBFIO_CPPFLAGS],
      [$ac_cv_libbfio_CPPFLAGS])
    ])
  AS_IF(
    [test "x$ac_cv_libbfio_LIBADD" != "x"],
    [AC_SUBST(
      [LIBBFIO_LIBADD],
      [$ac_cv_libbfio_LIBADD])
    ])

  AS_IF(
    [test "x$ac_cv_libbfio" = xyes],
    [AC_SUBST(
      [ax_libbfio_pc_libs_private],
      [-lbfio])
    ])

  AS_IF(
    [test "x$ac_cv_libbfio" = xyes],
    [AC_SUBST(
      [ax_libbfio_spec_requires],
      [libbfio])
    AC_SUBST(
      [ax_libbfio_spec_build_requires],
      [libbfio-devel])
    ])
  ])

