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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: vl_lib_readline
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<h1>
vl_lib_readline
</h1>
<h2>
SYNOPSIS
</h2>
<p class="indent" style="white-space:nowrap;">
<code>VL_LIB_READLINE</code>
</p>
<h2>
DESCRIPTION
</h2>
<div class="indent">
<p>
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.
</p>
<p>
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.
</p>
<p>
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:
</p>
<pre>
#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 */
</pre>
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<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/vl_lib_readline.m4">http://autoconf-archive.cryp.to/vl_lib_readline.m4</a>
</p>
<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 Ville Laurikari <vl@iki.fi>
</p>
<p>
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.
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