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78379c5e WJ |
1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)ln.c 4.15 (Berkeley) 2/24/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/param.h> | |
45 | #include <sys/stat.h> | |
46 | #include <stdio.h> | |
47 | #include <errno.h> | |
48 | #include <string.h> | |
49 | #include <stdlib.h> | |
50 | #include <unistd.h> | |
51 | ||
52 | static int dirflag, /* undocumented force flag */ | |
53 | sflag, /* symbolic, not hard, link */ | |
54 | (*linkf)(); /* system link call */ | |
55 | static linkit(), usage(); | |
56 | ||
57 | main(argc, argv) | |
58 | int argc; | |
59 | char **argv; | |
60 | { | |
61 | extern int optind; | |
62 | struct stat buf; | |
63 | int ch, exitval, link(), symlink(); | |
64 | char *sourcedir; | |
65 | ||
66 | while ((ch = getopt(argc, argv, "Fs")) != EOF) | |
67 | switch((char)ch) { | |
68 | case 'F': | |
69 | dirflag = 1; | |
70 | break; | |
71 | case 's': | |
72 | sflag = 1; | |
73 | break; | |
74 | case '?': | |
75 | default: | |
76 | usage(); | |
77 | } | |
78 | ||
79 | argv += optind; | |
80 | argc -= optind; | |
81 | ||
82 | linkf = sflag ? symlink : link; | |
83 | ||
84 | switch(argc) { | |
85 | case 0: | |
86 | usage(); | |
87 | case 1: /* ln target */ | |
88 | exit(linkit(argv[0], ".", 1)); | |
89 | case 2: /* ln target source */ | |
90 | exit(linkit(argv[0], argv[1], 0)); | |
91 | default: /* ln target1 target2 directory */ | |
92 | sourcedir = argv[argc - 1]; | |
93 | if (stat(sourcedir, &buf)) { | |
94 | (void)fprintf(stderr, | |
95 | "ln: %s: %s\n", sourcedir, strerror(errno)); | |
96 | exit(1); | |
97 | } | |
98 | if (!S_ISDIR(buf.st_mode)) | |
99 | usage(); | |
100 | for (exitval = 0; *argv != sourcedir; ++argv) | |
101 | exitval |= linkit(*argv, sourcedir, 1); | |
102 | exit(exitval); | |
103 | } | |
104 | /* NOTREACHED */ | |
105 | } | |
106 | ||
107 | static | |
108 | linkit(target, source, isdir) | |
109 | char *target, *source; | |
110 | int isdir; | |
111 | { | |
112 | struct stat buf; | |
113 | char path[MAXPATHLEN], *cp; | |
114 | ||
115 | if (!sflag) { | |
116 | /* if target doesn't exist, quit now */ | |
117 | if (stat(target, &buf)) { | |
118 | (void)fprintf(stderr, | |
119 | "ln: %s: %s\n", target, strerror(errno)); | |
120 | return(1); | |
121 | } | |
122 | /* only symbolic links to directories, unless -F option used */ | |
123 | if (!dirflag && (buf.st_mode & S_IFMT) == S_IFDIR) { | |
124 | (void)printf("ln: %s is a directory.\n", target); | |
125 | return(1); | |
126 | } | |
127 | } | |
128 | ||
129 | /* if the source is a directory, append the target's name */ | |
130 | if (isdir || !stat(source, &buf) && (buf.st_mode & S_IFMT) == S_IFDIR) { | |
131 | if (!(cp = rindex(target, '/'))) | |
132 | cp = target; | |
133 | else | |
134 | ++cp; | |
135 | (void)sprintf(path, "%s/%s", source, cp); | |
136 | source = path; | |
137 | } | |
138 | ||
139 | if ((*linkf)(target, source)) { | |
140 | (void)fprintf(stderr, "ln: %s: %s\n", source, strerror(errno)); | |
141 | return(1); | |
142 | } | |
143 | return(0); | |
144 | } | |
145 | ||
146 | static | |
147 | usage() | |
148 | { | |
149 | (void)fprintf(stderr, | |
150 | "usage:\tln [-s] file1 file2\n\tln [-s] file ... directory\n"); | |
151 | exit(1); | |
152 | } |