1 /* vi: set sw=4 ts=4: */
2 /*
3 * Mini basename implementation for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
11 *
12 * Changes:
13 * 1) Now checks for too many args. Need at least one and at most two.
14 * 2) Don't check for options, as per SUSv3.
15 * 3) Save some space by using strcmp(). Calling strncmp() here was silly.
16 */
17 //config:config BASENAME
18 //config: bool "basename"
19 //config: default y
20 //config: help
21 //config: basename is used to strip the directory and suffix from filenames,
22 //config: leaving just the filename itself. Enable this option if you wish
23 //config: to enable the 'basename' utility.
24
25 //applet:IF_BASENAME(APPLET_NOFORK(basename, basename, BB_DIR_USR_BIN, BB_SUID_DROP, basename))
26
27 //kbuild:lib-$(CONFIG_BASENAME) += basename.o
28
29 /* BB_AUDIT SUSv3 compliant */
30 /* http://www.opengroup.org/onlinepubs/007904975/utilities/basename.html */
31
32 //usage:#define basename_trivial_usage
33 //usage: "FILE [SUFFIX]"
34 //usage:#define basename_full_usage "\n\n"
35 //usage: "Strip directory path and .SUFFIX from FILE"
36 //usage:
37 //usage:#define basename_example_usage
38 //usage: "$ basename /usr/local/bin/foo\n"
39 //usage: "foo\n"
40 //usage: "$ basename /usr/local/bin/\n"
41 //usage: "bin\n"
42 //usage: "$ basename /foo/bar.txt .txt\n"
43 //usage: "bar"
44
45 #include "libbb.h"
46
47 /* This is a NOFORK applet. Be very careful! */
48
49 int basename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
basename_main(int argc,char ** argv)50 int basename_main(int argc, char **argv)
51 {
52 size_t m, n;
53 char *s;
54
55 if (argv[1] && strcmp(argv[1], "--") == 0) {
56 argv++;
57 argc--;
58 }
59
60 if ((unsigned)(argc-2) >= 2) {
61 bb_show_usage();
62 }
63
64 /* It should strip slash: /abc/def/ -> def */
65 s = bb_get_last_path_component_strip(*++argv);
66
67 m = strlen(s);
68 if (*++argv) {
69 n = strlen(*argv);
70 if ((m > n) && (strcmp(s+m-n, *argv) == 0)) {
71 m -= n;
72 /*s[m] = '\0'; - redundant */
73 }
74 }
75
76 /* puts(s) will do, but we can do without stdio this way: */
77 s[m++] = '\n';
78 /* NB: != is correct here: */
79 return full_write(STDOUT_FILENO, s, m) != (ssize_t)m;
80 }
81