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 */
Copyright © 2008 Ville Laurikari firstname.lastname@example.org
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