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/*
* LLDP Agent Daemon (LLDPAD) Software
* Copyright(c) 2012 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Contact Information:
* open-lldp Mailing List <lldp-devel@open-lldp.org>
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <dlfcn.h>
static int inited;
static char *(*readline_p)(const char *);
static void (*using_history_p)(void);
static void (*stifle_history_p)(int);
static void (*add_history_p)(const char *);
static void weak_readline_init(void)
{
void *hist_handle;
void *rl_handle;
inited = 1;
hist_handle = dlopen("libhistory.so", RTLD_LAZY | RTLD_GLOBAL);
if (!hist_handle)
return;
rl_handle = dlopen("libreadline.so", RTLD_LAZY | RTLD_GLOBAL);
if (!rl_handle)
goto out;
using_history_p = dlsym(hist_handle, "using_history");
stifle_history_p = dlsym(hist_handle, "stifle_history");
add_history_p = dlsym(hist_handle, "add_history");
readline_p = dlsym(rl_handle, "readline");
if (readline_p && using_history_p && stifle_history_p && add_history_p)
return;
dlclose(rl_handle);
rl_handle = NULL;
out:
dlclose(hist_handle);
hist_handle = NULL;
readline_p = NULL;
using_history_p = NULL;
stifle_history_p = NULL;
add_history_p = NULL;
}
void using_history(void)
{
if (!inited)
weak_readline_init();
if (using_history_p)
using_history_p();
}
void stifle_history(int max)
{
if (!inited)
weak_readline_init();
if (stifle_history_p)
stifle_history_p(max);
}
static char *do_readline(const char *prompt)
{
size_t size = 0;
ssize_t rc;
char *line = NULL;
fputs(prompt, stdout);
fflush(stdout);
rc = getline(&line, &size, stdin);
if (rc <= 0)
return NULL;
if (line[rc - 1] == '\n')
line[rc - 1] = 0;
return line;
}
char *readline(const char *prompt)
{
if (!inited)
weak_readline_init();
if (readline_p)
return readline_p(prompt);
return do_readline(prompt);
}
void add_history(const char *cmd)
{
if (!inited)
weak_readline_init();
if (add_history_p)
add_history_p(cmd);
}
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