VL_LIB_READLINE
, 

2002年04月04日

Ville Laurikari <vl@iki.fi>

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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. Users of this software should generally follow the principles of the MIT License includings its disclaimer.

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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 */

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