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/* |
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* $OpenBSD: readlink.c,v 1.27 2015/10/09 01:37:08 deraadt Exp $ |
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* |
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* Copyright (c) 1997 |
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* Kenneth Stailey (hereinafter referred to as the author) |
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <err.h> |
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#include <errno.h> |
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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 <string.h> |
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#include <unistd.h> |
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static void usage(void); |
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int |
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main(int argc, char *argv[]) |
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{ |
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char buf[PATH_MAX]; |
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int n, ch, nflag = 0, fflag = 0; |
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extern int optind; |
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✗✓ |
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if (pledge("stdio rpath wpath cpath", NULL) == -1) |
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err(1, "pledge"); |
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✓✓ |
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while ((ch = getopt(argc, argv, "fn")) != -1) |
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✓✓✗ |
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switch (ch) { |
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case 'f': |
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fflag = 1; |
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break; |
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case 'n': |
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nflag = 1; |
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break; |
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default: |
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usage(); |
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} |
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argc -= optind; |
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argv += optind; |
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✗✓ |
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if (argc != 1) |
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usage(); |
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n = strlen(argv[0]); |
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✗✓ |
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if (n > PATH_MAX - 1) { |
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fprintf(stderr, |
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"readlink: filename longer than PATH_MAX-1 (%d)\n", |
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PATH_MAX - 1); |
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exit(1); |
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} |
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✓✗ |
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if (fflag) { |
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✗✓ |
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if (realpath(argv[0], buf) == NULL) |
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err(1, "%s", argv[0]); |
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} else { |
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if ((n = readlink(argv[0], buf, sizeof buf-1)) < 0) |
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exit(1); |
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buf[n] = '\0'; |
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} |
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printf("%s", buf); |
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✗✓ |
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if (!nflag) |
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putchar('\n'); |
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exit(0); |
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} |
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static void |
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usage(void) |
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{ |
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(void)fprintf(stderr, "usage: readlink [-fn] file\n"); |
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exit(1); |
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} |