File: curses.m4

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dnl This file originated from GNU inetutils, which also uses curses.
dnl It was modified to allow use of ncursesw for wide character set.
dnl Also, it was modified to use PKG_CHECK_MODULES.
dnl
dnl IU_LIB_NCURSES, IU_LIB_CURSES and IU_LIB_TERMCAP are:
dnl Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
dnl Written by Miles Bader <miles@gnu.ai.mit.edu>
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2, or (at your option)
dnl any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, see <https://www.gnu.org/licenses/>.
dnl

dnl IU_LIB_NCURSES -- check for, and configure, ncurses
dnl
dnl If libncurses is found to exist on this system and the --disable-ncurses
dnl flag wasn't specified, defines LIBNCURSES with the appropriate linker
dnl specification, and possibly defines NCURSES_INCLUDE with the appropriate
dnl -I flag to get access to ncurses include files.
dnl
AC_DEFUN([IU_LIB_NCURSES], [
  AC_ARG_ENABLE(ncurses,    [  --disable-ncurses       don't prefer -lncurses over -lcurses],
              , enable_ncurses=yes)
  if test "$enable_ncurses" = yes; then
    PKG_CHECK_MODULES([NCURSES], [ncursesw], [LIBNCURSES="${NCURSES_LIBS}" have_ncursesw=yes], [
        PKG_CHECK_MODULES([NCURSES], [ncurses], [LIBNCURSES="${NCURSES_LIBS}" have_ncursesw=no], [
            AC_CHECK_LIB(ncursesw, initscr, LIBNCURSES="-lncursesw",
              AC_CHECK_LIB(ncurses, initscr, LIBNCURSES="-lncurses"))
            if test "$ac_cv_lib_ncursesw_initscr" = yes; then
              have_ncursesw=yes
            else
              have_ncursesw=no
            fi
        ])
    ])
    if test "$LIBNCURSES"; then
      # Use ncurses header files instead of the ordinary ones, if possible;
      # is there a better way of doing this, that avoids looking in specific
      # directories?
      AC_ARG_WITH([ncurses-include-dir],
                  AS_HELP_STRING([--with-ncurses-include-dir=DIR],
                         [Set directory containing the include files for
                          use with -lncurses, when it isn't installed as
                          the default curses library.  If DIR is "none",
                          then no special ncurses include files are used.]))
      if test "${with_ncurses_include_dir+set}" = set; then
        AC_MSG_CHECKING(for ncurses include dir)
	case "$with_ncurses_include_dir" in
	  no|none)
	    inetutils_cv_includedir_ncurses=none;;
	  *)
	    inetutils_cv_includedir_ncurses="$with_ncurses_include_dir";;
	esac
        AC_MSG_RESULT($inetutils_cv_includedir_ncurses)
      else
	AC_CACHE_CHECK(for ncurses include dir,
		       inetutils_cv_includedir_ncurses,
          if test "$have_ncursesw" = yes; then
            ncursesdir=ncursesw
          else
            ncursesdir=ncurses
          fi
	  for D in $includedir $prefix/include /local/include /usr/local/include /include /usr/include; do
	    if test -d $D/$ncursesdir; then
	      inetutils_cv_includedir_ncurses="$D/$ncursesdir"
	      break
	    fi
	    test "$inetutils_cv_includedir_ncurses" \
	      || inetutils_cv_includedir_ncurses=none
	  done)
      fi
      if test "$inetutils_cv_includedir_ncurses" = none; then
        NCURSES_INCLUDE=""
      else
        NCURSES_INCLUDE="-I$inetutils_cv_includedir_ncurses"
      fi
    fi
    if test $have_ncursesw = yes; then
      AC_DEFINE(HAVE_NCURSESW, 1, [Define if you have working ncursesw])
    fi
  fi
  AC_SUBST(NCURSES_INCLUDE)
  AC_SUBST(LIBNCURSES)])dnl

dnl IU_LIB_TERMCAP -- check for various termcap libraries
dnl
dnl Checks for various common libraries implementing the termcap interface,
dnl including ncurses (unless --disable ncurses is specified), curses (which
dnl does on some systems), termcap, and termlib.  If termcap is found, then
dnl LIBTERMCAP is defined with the appropriate linker specification.
dnl 
AC_DEFUN([IU_LIB_TERMCAP], [
  AC_REQUIRE([IU_LIB_NCURSES])
  if test "$LIBNCURSES"; then
    LIBTERMCAP="$LIBNCURSES"
  else
    AC_CHECK_LIB(curses, tgetent, LIBTERMCAP=-lcurses)
    if test "$ac_cv_lib_curses_tgetent" = no; then
      AC_CHECK_LIB(termcap, tgetent, LIBTERMCAP=-ltermcap)
    fi
    if test "$ac_cv_lib_termcap_tgetent" = no; then
      AC_CHECK_LIB(termlib, tgetent, LIBTERMCAP=-ltermlib)
    fi
  fi
  AC_SUBST(LIBTERMCAP)])dnl

dnl IU_LIB_CURSES -- check for curses, and associated libraries
dnl
dnl Checks for various libraries implementing the curses interface, and if
dnl found, defines LIBCURSES to be the appropriate linker specification,
dnl *including* any termcap libraries if needed (some versions of curses
dnl don't need termcap).
dnl
AC_DEFUN([IU_LIB_CURSES], [
  AC_REQUIRE([IU_LIB_TERMCAP])
  AC_REQUIRE([IU_LIB_NCURSES])
  if test "$LIBNCURSES"; then
    LIBCURSES="$LIBNCURSES"	# ncurses doesn't require termcap
  else
    _IU_SAVE_LIBS="$LIBS"
    LIBS="$LIBTERMCAP"
    AC_CHECK_LIB(curses, initscr, LIBCURSES="-lcurses")
    if test "$LIBCURSES" -a "$LIBTERMCAP" -a "$LIBCURSES" != "$LIBTERMCAP"; then
      AC_CACHE_CHECK(whether curses needs $LIBTERMCAP,
		     inetutils_cv_curses_needs_termcap,
	LIBS="$LIBCURSES"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <curses.h>]], [[initscr ();]])],[inetutils_cv_curses_needs_termcap=no],[inetutils_cv_curses_needs_termcap=yes]))
      if test $inetutils_cv_curses_needs_termcap = yes; then
	  LIBCURSES="$LIBCURSES $LIBTERMCAP"
      fi
    fi
    LIBS="$_IU_SAVE_LIBS"
  fi
  AC_SUBST(LIBCURSES)])dnl