modinfo: new applet
function old new delta modinfo_main - 307 +307 modinfo - 280 +280 packed_usage 27037 27131 +94 display - 74 +74 static.shortcuts - 24 +24 applet_names 2254 2262 +8 applet_main 1324 1328 +4 applet_nameofs 662 664 +2 ------------------------------------------------------------------------------ (add/remove: 5/0 grow/shrink: 4/0 up/down: 793/0) Total: 793 bytes Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Pascal Bellard
Denys Vlasenko
parent
2f32bf8be6
commit
22bdf90334
@ -5,6 +5,8 @@
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menu "Linux Module Utilities"
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INSERT
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config MODPROBE_SMALL
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bool "Simplified modutils"
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default y
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@ -5,6 +5,7 @@
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# Licensed under the GPL v2, see the file LICENSE in this tarball.
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lib-y:=
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INSERT
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lib-$(CONFIG_MODPROBE_SMALL) += modprobe-small.o
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lib-$(CONFIG_DEPMOD) += depmod.o modutils.o
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lib-$(CONFIG_INSMOD) += insmod.o modutils.o
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150
modutils/modinfo.c
Normal file
150
modutils/modinfo.c
Normal file
@ -0,0 +1,150 @@
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/* vi: set sw=4 ts=4: */
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/*
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* modinfo - retrieve module info
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* Copyright (c) 2008 Pascal Bellard
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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//applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o
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//config:config MODINFO
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//config: bool "modinfo"
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//config: default y
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//config: help
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//config: Show information about a Linux Kernel module
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#include <fnmatch.h>
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#include <sys/utsname.h> /* uname() */
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#include "libbb.h"
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#include "modutils.h"
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enum {
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OPT_TAGS = (1 << 6) - 1,
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OPT_F = (1 << 6), /* field name */
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OPT_0 = (1 << 7), /* \0 as separator */
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};
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struct modinfo_env {
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char *field;
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int tags;
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};
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static int display(const char *data, const char *pattern, int flag)
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{
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if (flag) {
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int n = printf("%s:", pattern);
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while (n++ < 16)
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bb_putchar(' ');
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}
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return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
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}
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static void modinfo(const char *path, struct modinfo_env *env)
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{
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static const char *const shortcuts[] = {
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"filename",
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"description",
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"author",
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"license",
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"vermagic",
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"parm",
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};
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size_t len;
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int j, length;
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char *ptr, *the_module;
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const char *field = env->field;
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int tags = env->tags;
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if (tags & 1) { /* filename */
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display(path, shortcuts[0], 1 != tags);
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}
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len = MAXINT(ssize_t);
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the_module = xmalloc_open_zipped_read_close(path, &len);
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if (!the_module)
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return;
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if (field)
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tags |= OPT_F;
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for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
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const char *pattern = field;
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if ((1<<j) & OPT_TAGS)
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pattern = shortcuts[j];
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if (!((1<<j) & tags))
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continue;
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length = strlen(pattern);
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ptr = the_module;
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while (1) {
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ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
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if (ptr == NULL) /* no occurance left, done */
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break;
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if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
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ptr += length + 1;
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ptr += display(ptr, pattern, (1<<j) != tags);
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}
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++ptr;
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}
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}
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free(the_module);
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}
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//usage:#define modinfo_trivial_usage
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//usage: "[-adlp0] [-F keyword] MODULE"
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//usage:#define modinfo_full_usage "\n\n"
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//usage: "Options:"
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//usage: "\n -a Shortcut for '-F author'"
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//usage: "\n -d Shortcut for '-F description'"
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//usage: "\n -l Shortcut for '-F license'"
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//usage: "\n -p Shortcut for '-F parm'"
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//usage: "\n -F keyword Keyword to look for"
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//usage: "\n -0 Separate output with NULs"
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//usage:#define modinfo_example_usage
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//usage: "$ modinfo -F vermagic loop\n"
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int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int modinfo_main(int argc UNUSED_PARAM, char **argv)
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{
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struct modinfo_env env;
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char name[MODULE_NAME_LEN];
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struct utsname uts;
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parser_t *p;
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char *colon, *tokens[2];
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unsigned opts;
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unsigned i;
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env.field = NULL;
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opt_complementary = "-1"; /* minimum one param */
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opts = getopt32(argv, "fdalvpF:0", &env.field);
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env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
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argv += optind;
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uname(&uts);
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p = config_open2(
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concat_path_file(
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concat_path_file(CONFIG_DEFAULT_MODULES_DIR, uts.release),
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CONFIG_DEFAULT_DEPMOD_FILE),
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xfopen_for_read
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);
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while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
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colon = last_char_is(tokens[0], ':');
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if (colon == NULL)
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continue;
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*colon = '\0';
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filename2modname(tokens[0], name);
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for (i = 0; argv[i]; i++) {
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if (fnmatch(argv[i], name, 0) == 0) {
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modinfo(tokens[0], &env);
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argv[i] = (char *) "";
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}
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}
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}
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for (i = 0; argv[i]; i++) {
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if (argv[i][0]) {
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modinfo(argv[i], &env);
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}
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}
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return 0;
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}
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