~drizzle-trunk/drizzle/development

##### http://autoconf-archive.cryp.to/vl_lib_readline.html

#

# SYNOPSIS

#

#   VL_LIB_READLINE

#

# DESCRIPTION

#

#   Searches for a readline compatible library. If found, defines

#   `HAVE_LIBREADLINE'. If the found library has the `add_history'

#   function, sets also `HAVE_READLINE_HISTORY'. Also checks for the

#   locations of the necessary include files and sets `HAVE_READLINE_H'

#   or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or

#   'HAVE_HISTORY_H' if the corresponding include files exists.

#

#   The libraries that may be readline compatible are `libedit',

#   `libeditline' and `libreadline'. Sometimes we need to link a

#   termcap library for readline to work, this macro tests these cases

#   too by trying to link with `libtermcap', `libcurses' or

#   `libncurses' before giving up.

#

#   Here is an example of how to use the information provided by this

#   macro to perform the necessary includes or declarations in a C

#   file:

#

#     #ifdef HAVE_LIBREADLINE

#     #  if defined(HAVE_READLINE_READLINE_H)

#     #    include <readline/readline.h>

#     #  elif defined(HAVE_READLINE_H)

#     #    include <readline.h>

#     #  else /* !defined(HAVE_READLINE_H) */

#     extern char *readline ();

#     #  endif /* !defined(HAVE_READLINE_H) */

#     char *cmdline = NULL;

#     #else /* !defined(HAVE_READLINE_READLINE_H) */

#       /* no readline */

#     #endif /* HAVE_LIBREADLINE */

#

#     #ifdef HAVE_READLINE_HISTORY

#     #  if defined(HAVE_READLINE_HISTORY_H)

#     #    include <readline/history.h>

#     #  elif defined(HAVE_HISTORY_H)

#     #    include <history.h>

#     #  else /* !defined(HAVE_HISTORY_H) */

#     extern void add_history ();

#     extern int write_history ();

#     extern int read_history ();

#     #  endif /* defined(HAVE_READLINE_HISTORY_H) */

#       /* no history */

#     #endif /* HAVE_READLINE_HISTORY */

#

# LAST MODIFICATION

#

#   2002-04-04

#

# COPYLEFT

#

#   Copyright (c) 2002 Ville Laurikari <vl@iki.fi>

#

#   Copying and distribution of this file, with or without

#   modification, are permitted in any medium without royalty provided

#   the copyright notice and this notice are preserved.

AC_DEFUN([VL_LIB_READLINE], [

  AC_CACHE_CHECK([for a readline compatible library],

                 vl_cv_lib_readline, [

    ORIG_LIBS="$LIBS"

    for readline_lib in readline edit editline; do

      for termcap_lib in "" termcap curses ncurses; do

        if test -z "$termcap_lib"; then

          TRY_LIB="-l$readline_lib"

        else

          TRY_LIB="-l$readline_lib -l$termcap_lib"

        fi

        LIBS="$ORIG_LIBS $TRY_LIB"

        AC_TRY_LINK_FUNC(readline, vl_cv_lib_readline="$TRY_LIB")

        if test -n "$vl_cv_lib_readline"; then

          break

        fi

      done

      if test -n "$vl_cv_lib_readline"; then

        break

      fi

    done

    if test -z "$vl_cv_lib_readline"; then

      vl_cv_lib_readline="no"

      LIBS="$ORIG_LIBS"

    fi

  ])

  if test "$vl_cv_lib_readline" != "no"; then

    AC_DEFINE(HAVE_LIBREADLINE, 1,

              [Define if you have a readline compatible library])

    AC_CHECK_HEADERS(readline.h readline/readline.h)

    AC_CACHE_CHECK([whether readline supports history],

                   vl_cv_lib_readline_history, [

      vl_cv_lib_readline_history="no"

      AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")

    ])

    if test "$vl_cv_lib_readline_history" = "yes"; then

      AC_DEFINE(HAVE_READLINE_HISTORY, 1,

                [Define if your readline library has \`add_history'])

      AC_CHECK_HEADERS(history.h readline/history.h)

    fi

  fi

])dnl