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  • Committer: Monty Taylor
  • Date: 2008-12-09 05:51:21 UTC
  • mfrom: (667.1.2 remove-strfill)
  • mto: This revision was merged to the branch mainline in revision 670.
  • Revision ID: monty@inaugust.com-20081209055121-oin4t65auiulqjwd
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m4/vl_lib_readline.m4
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##### http://autoconf-archive.cryp.to/vl_lib_readline.html
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#
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# SYNOPSIS
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#
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#   VL_LIB_READLINE
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#
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# DESCRIPTION
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#
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#   Searches for a readline compatible library. If found, defines
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#   `HAVE_LIBREADLINE'. If the found library has the `add_history'
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#   function, sets also `HAVE_READLINE_HISTORY'. Also checks for the
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#   locations of the necessary include files and sets `HAVE_READLINE_H'
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#   or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
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#   'HAVE_HISTORY_H' if the corresponding include files exists.
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#
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#   The libraries that may be readline compatible are `libedit',
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#   `libeditline' and `libreadline'. Sometimes we need to link a
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#   termcap library for readline to work, this macro tests these cases
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#   too by trying to link with `libtermcap', `libcurses' or
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#   `libncurses' before giving up.
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#
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#   Here is an example of how to use the information provided by this
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#   macro to perform the necessary includes or declarations in a C
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#   file:
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#
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#     #ifdef HAVE_LIBREADLINE
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#     #  if defined(HAVE_READLINE_READLINE_H)
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#     #    include <readline/readline.h>
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#     #  elif defined(HAVE_READLINE_H)
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#     #    include <readline.h>
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#     #  else /* !defined(HAVE_READLINE_H) */
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#     extern char *readline ();
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#     #  endif /* !defined(HAVE_READLINE_H) */
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#     char *cmdline = NULL;
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#     #else /* !defined(HAVE_READLINE_READLINE_H) */
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#       /* no readline */
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#     #endif /* HAVE_LIBREADLINE */
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#
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#     #ifdef HAVE_READLINE_HISTORY
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#     #  if defined(HAVE_READLINE_HISTORY_H)
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#     #    include <readline/history.h>
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#     #  elif defined(HAVE_HISTORY_H)
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#     #    include <history.h>
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#     #  else /* !defined(HAVE_HISTORY_H) */
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#     extern void add_history ();
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#     extern int write_history ();
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#     extern int read_history ();
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#     #  endif /* defined(HAVE_READLINE_HISTORY_H) */
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#       /* no history */
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#     #endif /* HAVE_READLINE_HISTORY */
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#
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# LAST MODIFICATION
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#
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#   2002-04-04
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#
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# COPYLEFT
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#
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#   Copyright (c) 2002 Ville Laurikari <vl@iki.fi>
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#
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#   Copying and distribution of this file, with or without
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#   modification, are permitted in any medium without royalty provided
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#   the copyright notice and this notice are preserved.
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AC_DEFUN([VL_LIB_READLINE], [
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  AC_CACHE_CHECK([for a readline compatible library],
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                 vl_cv_lib_readline, [
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    ORIG_LIBS="$LIBS"
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    for readline_lib in readline edit editline; do
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      for termcap_lib in "" termcap curses ncurses; do
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        if test -z "$termcap_lib"; then
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          TRY_LIB="-l$readline_lib"
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        else
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          TRY_LIB="-l$readline_lib -l$termcap_lib"
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        fi
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        LIBS="$ORIG_LIBS $TRY_LIB"
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        AC_TRY_LINK_FUNC(readline, vl_cv_lib_readline="$TRY_LIB")
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        if test -n "$vl_cv_lib_readline"; then
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          break
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        fi
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      done
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      if test -n "$vl_cv_lib_readline"; then
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        break
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      fi
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    done
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    if test -z "$vl_cv_lib_readline"; then
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      vl_cv_lib_readline="no"
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      LIBS="$ORIG_LIBS"
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    fi
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  ])
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  if test "$vl_cv_lib_readline" != "no"; then
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    AC_DEFINE(HAVE_LIBREADLINE, 1,
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              [Define if you have a readline compatible library])
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    AC_CHECK_HEADERS(readline.h readline/readline.h)
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    AC_CACHE_CHECK([whether readline supports history],
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                   vl_cv_lib_readline_history, [
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      vl_cv_lib_readline_history="no"
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      AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
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    ])
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    if test "$vl_cv_lib_readline_history" = "yes"; then
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      AC_DEFINE(HAVE_READLINE_HISTORY, 1,
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                [Define if your readline library has \`add_history'])
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      AC_CHECK_HEADERS(history.h readline/history.h)
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    fi
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  fi
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])dnl