ipcalc applet by Stephan Linz and Jordan Crouse
[people/mcb30/busybox.git] / findutils / which.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Which 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 /* getopt not needed */
25 #include <string.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include "busybox.h"
29
30 extern int which_main(int argc, char **argv)
31 {
32         char *path_list, *path_n;
33         struct stat filestat;
34         int i, count=1, found, status = EXIT_SUCCESS;
35
36         if (argc <= 1 || **(argv + 1) == '-')
37                 show_usage();
38         argc--;
39
40         path_list = getenv("PATH");
41         if (path_list != NULL) {
42                 for(i=strlen(path_list); i > 0; i--)
43                         if (path_list[i]==':') {
44                                 path_list[i]=0;
45                                 count++;
46                         }
47         } else {
48                 path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
49                 count = 5;
50         }
51
52         while(argc-- > 0) { 
53                 path_n = path_list;
54                 argv++;
55                 found = 0;
56                 for (i = 0; i < count; i++) {
57                         char *buf;
58                         buf = concat_path_file(path_n, *argv);
59                         if (stat (buf, &filestat) == 0
60                             && filestat.st_mode & S_IXUSR)
61                         {
62                                 puts(buf);
63                                 found = 1;
64                                 break;
65                         }
66                         free(buf);
67                         path_n += (strlen(path_n) + 1);
68                 }
69                 if (!found)
70                         status = EXIT_FAILURE;
71         }
72         return status;
73 }
74
75 /*
76 Local Variables:
77 c-file-style: "linux"
78 c-basic-offset: 4
79 tab-width: 4
80 End:
81 */