Merge "Lose readlink to toybox."

    newfs_msdos \

    notify \

    ps \

    readlink \

    renice \

    restorecon \

    route \

/*

 * Copyright (c) 2013, The Android Open Source Project

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *  * Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *  * 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.

 *  * Neither the name of Google, Inc. nor the names of its contributors

 *    may be used to endorse or promote products derived from this

 *    software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "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

 * COPYRIGHT OWNER OR CONTRIBUTORS 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 <stdio.h>

#include <stdlib.h>

#include <unistd.h>

static int skip_newline, quiet_errors, canonicalize;

static void usage(char* name) {

    fprintf(stderr, "Usage: %s [OPTION]... FILE\n", name);

}

int readlink_main(int argc, char* argv[]) {

    int c;

    while ((c = getopt(argc, argv, "nfqs")) != -1) {

        switch (c) {

        case 'n':

            skip_newline = 1;

            break;

        case 'f':

            canonicalize = 1;

            break;

        case 'q':

        case 's':

            quiet_errors = 1;

            break;

        case '?':

        default:

            usage(argv[0]);

            return EXIT_FAILURE;

        }

    }

    int index = optind;

    if (argc - index != 1) {

        usage(argv[0]);

        return EXIT_FAILURE;

    }

    char name[PATH_MAX+1];

    if (canonicalize) {

        if(!realpath(argv[optind], name)) {

            if (!quiet_errors) {

                perror("readlink");

            }

            return EXIT_FAILURE;

        }

    } else {

        ssize_t len = readlink(argv[1], name, PATH_MAX);

        if (len < 0) {

            if (!quiet_errors) {

                perror("readlink");

            }

            return EXIT_FAILURE;

        }

        name[len] = '\0';

    }

    fputs(name, stdout);

    if (!skip_newline) {

        fputs("\n", stdout);

    }

    return EXIT_SUCCESS;

}