/*
* $OpenBSD: readlink.c,v 1.12 1997/09/23 20:39:11 niklas Exp $
*
* Copyright (c) 1997
*      Kenneth Stailey (hereinafter referred to as the author)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

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

int
main(argc, argv)
       int argc;
       char **argv;
{
       char buf[PATH_MAX];
       int n, ch, nflag = 0, fflag = 0;
       extern int optind;

       while ((ch = getopt(argc, argv, "fn")) != -1)
               switch (ch) {
               case 'f':
                       fflag = 1;
                       break;
               case 'n':
                       nflag = 1;
                       break;
               default:
                       (void)fprintf(stderr,
                           "usage: readlink [-n] [-f] symlink\n");
                       exit(1);
               }
       argc -= optind;
       argv += optind;

       if (argc != 1) {
               fprintf(stderr, "usage: readlink [-n] [-f] symlink\n");
               exit(1);
       }

       n = strlen(argv[0]);
       if (n > PATH_MAX - 1)
               errx(1, "filename longer than PATH_MAX-1 (%d)\n",
                   PATH_MAX - 1);

       if (fflag)
               realpath(argv[0], buf);
       else if ((n = readlink(argv[0], buf, PATH_MAX)) < 0)
               exit(1);
       buf[n] = '\0';

       printf("%s", buf);
       if (!nflag)
               putchar('\n');
       exit(0);
}