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41 results

readlink.c

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  • user avatar
    Michael Wright authored
    Change-Id: I4c2624d22ce879a3578d5b17440a9895b19e2f1f
    1e1d2913
    History
    readlink.c 2.92 KiB
    /*
     * 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;
    }