/* * 
 * This file is part of bufferpool
 *
 * Copyright (C) 2007 by LScube team <team@streaming.polito.it>
 * See AUTHORS for more details
 * 
 * bufferpool is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * bufferpool is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with bufferpool; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
 *
 *  
 *  this piece of code was inspired from Richard Stevens source code of
 *  UNIX Network Programming, Volume 2, Second Edition: Interprocess Communications,
 *  Prentice Hall, 1999, ISBN 0-13-081081-9.
 * 
 * */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#ifndef PATH_MAX
#define PATH_MAX 4096
#endif

char *bp_ipc_name(const char *firstname, const char *lastname)
{
    char *dir, *dst, *slash;

    if ((dst = malloc(PATH_MAX)) == NULL)
        return (NULL);

    /* 4can override default directory with environment variable */
    if ((dir = getenv("PX_IPC_NAME")) == NULL) {
#ifdef    POSIX_IPC_PREFIX
        dir = POSIX_IPC_PREFIX;    /* from "config.h" */
#else
        dir = "";    // "/tmp/";   /* default */
#endif
    }
    /* 4dir must end in a slash */
    slash = (strlen(dir) && (dir[strlen(dir) - 1] == '/')) ? "" : "/";
    snprintf(dst, PATH_MAX, "%s%s%s.%s", dir, slash, firstname, lastname);

    return (dst);        /* caller can free() this pointer */
}