95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/*
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* Copyright (c) 2013, The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google, Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static int skip_newline, quiet_errors, canonicalize;
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static void usage(char* name) {
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fprintf(stderr, "Usage: %s [OPTION]... FILE\n", name);
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}
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int readlink_main(int argc, char* argv[]) {
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int c;
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while ((c = getopt(argc, argv, "nfqs")) != -1) {
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switch (c) {
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case 'n':
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skip_newline = 1;
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break;
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case 'f':
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canonicalize = 1;
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break;
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case 'q':
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case 's':
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quiet_errors = 1;
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break;
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case '?':
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default:
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usage(argv[0]);
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return EXIT_FAILURE;
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}
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}
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int index = optind;
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if (argc - index != 1) {
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usage(argv[0]);
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return EXIT_FAILURE;
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}
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char name[PATH_MAX+1];
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if (canonicalize) {
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if(!realpath(argv[optind], name)) {
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if (!quiet_errors) {
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perror("readlink");
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}
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return EXIT_FAILURE;
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}
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} else {
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ssize_t len = readlink(argv[1], name, PATH_MAX);
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if (len < 0) {
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if (!quiet_errors) {
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perror("readlink");
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}
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return EXIT_FAILURE;
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}
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name[len] = '\0';
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}
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fputs(name, stdout);
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if (!skip_newline) {
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fputs("\n", stdout);
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}
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return EXIT_SUCCESS;
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}
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