Contents of /trunk/mkinitrd-magellan/busybox/modutils/modinfo.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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File size: 3964 byte(s)
Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 3964 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * modinfo - retrieve module info |
4 | * Copyright (c) 2008 Pascal Bellard |
5 | * |
6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
7 | */ |
8 | |
9 | //applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP)) |
10 | |
11 | //kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o |
12 | |
13 | //config:config MODINFO |
14 | //config: bool "modinfo" |
15 | //config: default y |
16 | //config: help |
17 | //config: Show information about a Linux Kernel module |
18 | |
19 | #include <fnmatch.h> |
20 | #include <sys/utsname.h> /* uname() */ |
21 | #include "libbb.h" |
22 | #include "modutils.h" |
23 | |
24 | |
25 | enum { |
26 | OPT_TAGS = (1 << 6) - 1, |
27 | OPT_F = (1 << 6), /* field name */ |
28 | OPT_0 = (1 << 7), /* \0 as separator */ |
29 | }; |
30 | |
31 | struct modinfo_env { |
32 | char *field; |
33 | int tags; |
34 | }; |
35 | |
36 | static int display(const char *data, const char *pattern, int flag) |
37 | { |
38 | if (flag) { |
39 | int n = printf("%s:", pattern); |
40 | while (n++ < 16) |
41 | bb_putchar(' '); |
42 | } |
43 | return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n'); |
44 | } |
45 | |
46 | static void modinfo(const char *path, const char *version, |
47 | struct modinfo_env *env) |
48 | { |
49 | static const char *const shortcuts[] = { |
50 | "filename", |
51 | "description", |
52 | "author", |
53 | "license", |
54 | "vermagic", |
55 | "parm", |
56 | }; |
57 | size_t len; |
58 | int j, length; |
59 | char *ptr, *the_module; |
60 | const char *field = env->field; |
61 | int tags = env->tags; |
62 | |
63 | if (tags & 1) { /* filename */ |
64 | display(path, shortcuts[0], 1 != tags); |
65 | } |
66 | |
67 | len = MAXINT(ssize_t); |
68 | the_module = xmalloc_open_zipped_read_close(path, &len); |
69 | if (!the_module) { |
70 | if (path[0] == '/') |
71 | return; |
72 | /* Newer depmod puts relative paths in modules.dep */ |
73 | path = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path); |
74 | the_module = xmalloc_open_zipped_read_close(path, &len); |
75 | free((char*)path); |
76 | if (!the_module) |
77 | return; |
78 | } |
79 | |
80 | if (field) |
81 | tags |= OPT_F; |
82 | for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) { |
83 | const char *pattern = field; |
84 | if ((1<<j) & OPT_TAGS) |
85 | pattern = shortcuts[j]; |
86 | if (!((1<<j) & tags)) |
87 | continue; |
88 | length = strlen(pattern); |
89 | ptr = the_module; |
90 | while (1) { |
91 | ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module)); |
92 | if (ptr == NULL) /* no occurance left, done */ |
93 | break; |
94 | if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') { |
95 | ptr += length + 1; |
96 | ptr += display(ptr, pattern, (1<<j) != tags); |
97 | } |
98 | ++ptr; |
99 | } |
100 | } |
101 | free(the_module); |
102 | } |
103 | |
104 | //usage:#define modinfo_trivial_usage |
105 | //usage: "[-adlp0] [-F keyword] MODULE" |
106 | //usage:#define modinfo_full_usage "\n\n" |
107 | //usage: "Options:" |
108 | //usage: "\n -a Shortcut for '-F author'" |
109 | //usage: "\n -d Shortcut for '-F description'" |
110 | //usage: "\n -l Shortcut for '-F license'" |
111 | //usage: "\n -p Shortcut for '-F parm'" |
112 | //usage: "\n -F keyword Keyword to look for" |
113 | //usage: "\n -0 Separate output with NULs" |
114 | //usage:#define modinfo_example_usage |
115 | //usage: "$ modinfo -F vermagic loop\n" |
116 | |
117 | int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
118 | int modinfo_main(int argc UNUSED_PARAM, char **argv) |
119 | { |
120 | struct modinfo_env env; |
121 | char name[MODULE_NAME_LEN]; |
122 | struct utsname uts; |
123 | parser_t *parser; |
124 | char *colon, *tokens[2]; |
125 | unsigned opts; |
126 | unsigned i; |
127 | |
128 | env.field = NULL; |
129 | opt_complementary = "-1"; /* minimum one param */ |
130 | opts = getopt32(argv, "fdalvpF:0", &env.field); |
131 | env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS; |
132 | argv += optind; |
133 | |
134 | uname(&uts); |
135 | parser = config_open2( |
136 | xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE), |
137 | xfopen_for_read |
138 | ); |
139 | |
140 | while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) { |
141 | colon = last_char_is(tokens[0], ':'); |
142 | if (colon == NULL) |
143 | continue; |
144 | *colon = '\0'; |
145 | filename2modname(tokens[0], name); |
146 | for (i = 0; argv[i]; i++) { |
147 | if (fnmatch(argv[i], name, 0) == 0) { |
148 | modinfo(tokens[0], uts.release, &env); |
149 | argv[i] = (char *) ""; |
150 | } |
151 | } |
152 | } |
153 | if (ENABLE_FEATURE_CLEAN_UP) |
154 | config_close(parser); |
155 | |
156 | for (i = 0; argv[i]; i++) { |
157 | if (argv[i][0]) { |
158 | modinfo(argv[i], uts.release, &env); |
159 | } |
160 | } |
161 | |
162 | return 0; |
163 | } |