Apply lash_patch35 from vodz, which brings several nice size_optimizations.
[oweals/busybox.git] / coreutils / ln.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini ln implementation for busybox
4  *
5  * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
6  * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  *
22  */
23
24 #include <stdio.h>
25 #include <dirent.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include "busybox.h"
31
32
33 static const int LN_SYMLINK = 1;
34 static const int LN_FORCE = 2;
35 static const int LN_NODEREFERENCE = 4;
36
37 /*
38  * linkDestName is where the link points to,
39  * linkSrcName is the name of the link to be created.
40  */
41 static int fs_link(const char *link_destname, const char *link_srcname, 
42                 const int flag)
43 {
44         int status;
45         int src_is_dir;
46         char *src_name;
47
48         if (link_destname==NULL)
49                 return(FALSE);
50
51         src_name = (char *) xmalloc(strlen(link_srcname)+strlen(link_destname)+1);
52
53         if (link_srcname==NULL)
54                 strcpy(src_name, link_destname);
55         else
56                 strcpy(src_name, link_srcname);
57
58         if (flag&LN_NODEREFERENCE)
59                 src_is_dir = is_directory(src_name, TRUE, NULL);
60         else
61                 src_is_dir = is_directory(src_name, FALSE, NULL);       
62         
63         if ((src_is_dir==TRUE)&&((flag&LN_NODEREFERENCE)==0)) {
64                 char* srcdir_name;
65
66                 srcdir_name = xstrdup(link_destname);
67                 strcat(src_name, "/");
68                 strcat(src_name, get_last_path_component(srcdir_name));
69                 free(srcdir_name);
70         }
71         
72         if (flag&LN_FORCE)
73                 unlink(src_name);
74                 
75         if (flag&LN_SYMLINK)
76                 status = symlink(link_destname, src_name);
77         else
78                 status = link(link_destname, src_name);
79
80         if (status != 0) {
81                 perror_msg(src_name);
82                 return(FALSE);
83         }
84         return(TRUE);
85 }
86
87 extern int ln_main(int argc, char **argv)
88 {
89         int status = EXIT_SUCCESS;
90         int flag = 0;
91         int opt;
92         
93         /* Parse any options */
94         while ((opt=getopt(argc, argv, "sfn")) != -1) {
95                 switch(opt) {
96                         case 's':
97                                 flag |= LN_SYMLINK;
98                                 break;
99                         case 'f':
100                                 flag |= LN_FORCE;
101                                 break;
102                         case 'n':
103                                 flag |= LN_NODEREFERENCE;
104                                 break;
105                         default:
106                                 show_usage();
107                 }
108         }
109         if (optind > (argc-1)) {
110                 show_usage();
111         } 
112         if (optind == (argc-1)) {
113                 if (fs_link(argv[optind], 
114                                         get_last_path_component(argv[optind]), flag)==FALSE)
115                         status = EXIT_FAILURE;
116         }
117         while(optind<(argc-1)) {
118                 if (fs_link(argv[optind], argv[argc-1], flag)==FALSE)
119                         status = EXIT_FAILURE;
120                 optind++;
121         }
122         return status;
123 }
124
125 /*
126 Local Variables:
127 c-file-style: "linux"
128 c-basic-offset: 4
129 tab-width: 4
130 End:
131 */