/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/sysmacros.h>
#include <libintl.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <dlfcn.h>
#include <link.h>

#include "utils.h"

static void *lib_hdl = NULL;

static const char PNAME_FMT[] = "%s: ";
static const char ERRNO_FMT[] = ": %s\n";

static const char *pname;

/*PRINTFLIKE1*/
void
warn(const char *format, ...)
{
        int err = errno;
        va_list alist;

        if (pname != NULL)
                (void) fprintf(stderr, gettext(PNAME_FMT), pname);

        va_start(alist, format);
        (void) vfprintf(stderr, format, alist);
        va_end(alist);

        if (strchr(format, '\n') == NULL)
                (void) fprintf(stderr, gettext(ERRNO_FMT), strerror(err));
}

/*PRINTFLIKE1*/
void
die(const char *format, ...)
{
        int err = errno;
        va_list alist;

        if (pname != NULL)
                (void) fprintf(stderr, gettext(PNAME_FMT), pname);

        va_start(alist, format);
        (void) vfprintf(stderr, format, alist);
        va_end(alist);

        if (strchr(format, '\n') == NULL)
                (void) fprintf(stderr, gettext(ERRNO_FMT), strerror(err));
        exit(E_ERROR);
}

const char *
getpname(const char *arg0)
{
        const char *p = strrchr(arg0, '/');

        if (p == NULL)
                p = arg0;
        else
                p++;

        pname = p;
        return (p);
}

int
valid_abspath(const char *p)
{
        if (p[0] != '/') {
                warn(gettext("pathname is not an absolute path -- %s\n"), p);
                return (0);
        }

        if (strlen(p) > MAXPATHLEN) {
                warn(gettext("pathname is too long -- %s\n"), p);
                return (0);
        }

        return (1);
}

/*
 * Wrapper for dlopen'ing a library.
 * The caller must call closelib() once
 * access to the library is no longer needed.
 */
void *
openlib(const char *lib)
{
        lib_hdl = dlopen(lib, RTLD_LAZY);
        return (lib_hdl);
}

void
closelib()
{
        if (lib_hdl != NULL)
                (void) dlclose(lib_hdl);
}