96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* $OpenBSD: readlink.c,v 1.28 2019/06/28 13:35:03 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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if (pledge("stdio rpath", NULL) == -1)
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err(1, "pledge");
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while ((ch = getopt(argc, argv, "fn")) != -1)
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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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if (argc != 1)
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usage();
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n = strlen(argv[0]);
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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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if (fflag) {
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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)) == -1)
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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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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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}
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