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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	bin/ln/ln.c	Lines:	35	64	54.7 %
Date:	2016-12-06	Branches:	42	68	61.8 %


/*	$OpenBSD: ln.c,v 1.24 2016/05/10 20:20:43 tim Exp $	*/
/*	$NetBSD: ln.c,v 1.10 1995/03/21 09:06:10 cgd Exp $	*/

/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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 <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

int	fflag;				/* Unlink existing files. */
int	hflag;				/* Check new name for symlink first. */
int	Pflag;				/* Hard link to symlink. */
int	sflag;				/* Symbolic, not hard, link. */

int	linkit(char *, char *, int);
void	usage(void) __dead;

int
main(int argc, char *argv[])
{
	struct stat sb;
	int ch, exitval;
	char *sourcedir;

	if (pledge("stdio rpath cpath wpath", NULL) == -1)
		err(1, "pledge");

	while ((ch = getopt(argc, argv, "fhLnPs")) != -1)
		switch (ch) {
		case 'f':
			fflag = 1;
			break;
		case 'h':
		case 'n':
			hflag = 1;
			break;
		case 'L':
			Pflag = 0;
			break;
		case 'P':
			Pflag = 1;
			break;
		case 's':
			sflag = 1;
			break;
		default:
			usage();
		}

	argv += optind;
	argc -= optind;

	switch(argc) {
	case 0:
		usage();
	case 1:				/* ln target */
		exit(linkit(argv[0], ".", 1));
	case 2:				/* ln target source */
		exit(linkit(argv[0], argv[1], 0));
	}
					/* ln target1 target2 directory */
	sourcedir = argv[argc - 1];
	if (stat(sourcedir, &sb))
		err(1, "%s", sourcedir);
	if (!S_ISDIR(sb.st_mode))
		usage();
	for (exitval = 0; *argv != sourcedir; ++argv)
		exitval |= linkit(*argv, sourcedir, 1);
	exit(exitval);
}

 /*
  * Nomenclature warning!
  *
  * In this source "target" and "source" are used the opposite way they
  * are used in the ln(1) manual.  Here "target" is the existing file and
  * "source" specifies the to-be-created link to "target".
  */
int
linkit(char *target, char *source, int isdir)
{
	struct stat sb;
	char *p, path[PATH_MAX];
	int (*statf)(const char *, struct stat *);
	int exists, n;

	if (!sflag) {
		/* If target doesn't exist, quit now. */
		if ((Pflag ? lstat : stat)(target, &sb)) {
			warn("%s", target);
			return (1);
		}
		/* Only symbolic links to directories. */
		if (S_ISDIR(sb.st_mode)) {
			warnc(EISDIR, "%s", target);
			return (1);
		}
	}

	statf = hflag ? lstat : stat;

	/* If the source is a directory, append the target's name. */
	if (isdir || (!statf(source, &sb) && S_ISDIR(sb.st_mode))) {
		if ((p = basename(target)) == NULL) {
			warn("%s", target);
			return (1);
		}
		n = snprintf(path, sizeof(path), "%s/%s", source, p);
		if (n < 0 || n >= sizeof(path)) {
			warnc(ENAMETOOLONG, "%s/%s", source, p);
			return (1);
		}
		source = path;
	}

	exists = (lstat(source, &sb) == 0);
	/*
	 * If doing hard links and the source (destination) exists and it
	 * actually is the same file like the target (existing file), we
	 * complain that the files are identical.  If -f is specified, we
	 * accept the job as already done and return with success.
	 */
	if (exists && !sflag) {
		struct stat tsb;

		if ((Pflag ? lstat : stat)(target, &tsb)) {
			warn("%s: disappeared", target);
			return (1);
		}

		if (tsb.st_dev == sb.st_dev && tsb.st_ino == sb.st_ino) {
			if (fflag)
				return (0);
			else {
				warnx("%s and %s are identical (nothing done).",
				    target, source);
				return (1);
			}
		}
	}
	/*
	 * If the file exists, and -f was specified, unlink it.
	 * Attempt the link.
	 */
	if ((fflag && unlink(source) < 0 && errno != ENOENT) ||
	    (sflag ? symlink(target, source) :
	    linkat(AT_FDCWD, target, AT_FDCWD, source,
	    Pflag ? 0 : AT_SYMLINK_FOLLOW))) {
		warn("%s", source);
		return (1);
	}

	return (0);
}

void
usage(void)
{
	extern char *__progname;

	(void)fprintf(stderr,
	    "usage: %s [-fhLnPs] source [target]\n"
	    "       %s [-fLPs] source ... [directory]\n",
	    __progname, __progname);
	exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ln.c,v 1.24 2016/05/10 20:20:43 tim Exp $ */
2			/* $NetBSD: ln.c,v 1.10 1995/03/21 09:06:10 cgd Exp $ */
3
4			/*
5			* Copyright (c) 1987, 1993, 1994
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <sys/types.h>
34			#include <sys/stat.h>
35
36			#include <err.h>
37			#include <errno.h>
38			#include <fcntl.h>
39			#include <libgen.h>
40			#include <stdio.h>
41			#include <stdlib.h>
42			#include <string.h>
43			#include <unistd.h>
44			#include <limits.h>
45
46			int fflag; /* Unlink existing files. */
47			int hflag; /* Check new name for symlink first. */
48			int Pflag; /* Hard link to symlink. */
49			int sflag; /* Symbolic, not hard, link. */
50
51			int linkit(char , char , int);
52			void usage(void) __dead;
53
54			int
55			main(int argc, char *argv[])
56		163	{
57			struct stat sb;
58			int ch, exitval;
59			char *sourcedir;
60
61	✗✓	163	if (pledge("stdio rpath cpath wpath", NULL) == -1)
62			err(1, "pledge");
63
64	✓✓	256	while ((ch = getopt(argc, argv, "fhLnPs")) != -1)
65	✓✗✓✓ ✓✗	93	switch (ch) {
66			case 'f':
67		2	fflag = 1;
68		2	break;
69			case 'h':
70			case 'n':
71			hflag = 1;
72			break;
73			case 'L':
74		2	Pflag = 0;
75		2	break;
76			case 'P':
77		3	Pflag = 1;
78		3	break;
79			case 's':
80		86	sflag = 1;
81		86	break;
82			default:
83			usage();
84			}
85
86		163	argv += optind;
87		163	argc -= optind;
88
89	✗✗✓✗	163	switch(argc) {
90			case 0:
91			usage();
92			case 1: /* ln target */
93			exit(linkit(argv[0], ".", 1));
94			case 2: /* ln target source */
95		163	exit(linkit(argv[0], argv[1], 0));
96			}
97			/* ln target1 target2 directory */
98			sourcedir = argv[argc - 1];
99			if (stat(sourcedir, &sb))
100			err(1, "%s", sourcedir);
101			if (!S_ISDIR(sb.st_mode))
102			usage();
103			for (exitval = 0; *argv != sourcedir; ++argv)
104			exitval \|= linkit(*argv, sourcedir, 1);
105			exit(exitval);
106			}
107
108			/*
109			* Nomenclature warning!
110			*
111			* In this source "target" and "source" are used the opposite way they
112			* are used in the ln(1) manual. Here "target" is the existing file and
113			* "source" specifies the to-be-created link to "target".
114			*/
115			int
116			linkit(char target, char source, int isdir)
117		163	{
118			struct stat sb;
119			char *p, path[PATH_MAX];
120			int (statf)(const char , struct stat *);
121			int exists, n;
122
123	✓✓	163	if (!sflag) {
124			/* If target doesn't exist, quit now. */
125	✓✓✗✓	77	if ((Pflag ? lstat : stat)(target, &sb)) {
126			warn("%s", target);
127			return (1);
128			}
129			/* Only symbolic links to directories. */
130	✗✓	77	if (S_ISDIR(sb.st_mode)) {
131			warnc(EISDIR, "%s", target);
132			return (1);
133			}
134			}
135
136	✗✓	163	statf = hflag ? lstat : stat;
137
138			/* If the source is a directory, append the target's name. */
139	✓✗✓✓ ✓✓	163	if (isdir \|\| (!statf(source, &sb) && S_ISDIR(sb.st_mode))) {
140	✗✓	7	if ((p = basename(target)) == NULL) {
141			warn("%s", target);
142			return (1);
143			}
144		7	n = snprintf(path, sizeof(path), "%s/%s", source, p);
145	✗✓	7	if (n < 0 \|\| n >= sizeof(path)) {
146			warnc(ENAMETOOLONG, "%s/%s", source, p);
147			return (1);
148			}
149		7	source = path;
150			}
151
152		163	exists = (lstat(source, &sb) == 0);
153			/*
154			* If doing hard links and the source (destination) exists and it
155			* actually is the same file like the target (existing file), we
156			* complain that the files are identical. If -f is specified, we
157			* accept the job as already done and return with success.
158			*/
159	✓✓✓✓	163	if (exists && !sflag) {
160			struct stat tsb;
161
162	✓✗✗✓	2	if ((Pflag ? lstat : stat)(target, &tsb)) {
163			warn("%s: disappeared", target);
164			return (1);
165			}
166
167	✓✗✓✗	2	if (tsb.st_dev == sb.st_dev && tsb.st_ino == sb.st_ino) {
168	✗✓	2	if (fflag)
169			return (0);
170			else {
171		2	warnx("%s and %s are identical (nothing done).",
172			target, source);
173		2	return (1);
174			}
175			}
176			}
177			/*
178			* If the file exists, and -f was specified, unlink it.
179			* Attempt the link.
180			*/
181	✓✓✓✓ ✓✗✓✓ ✗✓✓✓ ✗✓	161	if ((fflag && unlink(source) < 0 && errno != ENOENT) \|\|
182			(sflag ? symlink(target, source) :
183			linkat(AT_FDCWD, target, AT_FDCWD, source,
184			Pflag ? 0 : AT_SYMLINK_FOLLOW))) {
185			warn("%s", source);
186			return (1);
187			}
188
189		161	return (0);
190			}
191
192			void
193			usage(void)
194			{
195			extern char *__progname;
196
197			(void)fprintf(stderr,
198			"usage: %s [-fhLnPs] source [target]\n"
199			" %s [-fLPs] source ... [directory]\n",
200			__progname, __progname);
201			exit(1);
202			}