busybox/modutils/modinfo.c
Denys Vlasenko 8dff01d06a libbb: introduce and use is_prefixed_with()
function                                             old     new   delta
is_prefixed_with                                       -      18     +18
complete_username                                     78      77      -1
man_main                                             737     735      -2
fsck_device                                          429     427      -2
unpack_ar_archive                                     80      76      -4
strip_unsafe_prefix                                  105     101      -4
singlemount                                         1054    1050      -4
rtc_adjtime_is_utc                                    90      86      -4
resolve_mount_spec                                    88      84      -4
parse_one_line                                      1029    1025      -4
parse_conf                                          1460    1456      -4
may_wakeup                                            83      79      -4
loadkmap_main                                        219     215      -4
get_irqs_from_stat                                   103      99      -4
get_header_cpio                                      913     909      -4
findfs_main                                           79      75      -4
fbsplash_main                                       1230    1226      -4
load_crontab                                         776     771      -5
expand_vars_to_list                                 1151    1146      -5
date_main                                            881     876      -5
skip_dev_pfx                                          30      24      -6
make_device                                         2199    2193      -6
complete_cmd_dir_file                                773     767      -6
run_applet_and_exit                                  715     708      -7
uudecode_main                                        321     313      -8
pwdx_main                                            197     189      -8
execute                                              568     560      -8
i2cdetect_main                                      1186    1176     -10
procps_scan                                         1242    1230     -12
procps_read_smaps                                   1017    1005     -12
process_module                                       746     734     -12
patch_main                                          1903    1891     -12
nfsmount                                            3572    3560     -12
stack_machine                                        126     112     -14
process_timer_stats                                  449     435     -14
match_fstype                                         111      97     -14
do_ipaddr                                           1344    1330     -14
open_list_and_close                                  359     343     -16
get_header_tar                                      1795    1779     -16
prepend_new_eth_table                                340     323     -17
fsck_main                                           1811    1794     -17
find_iface_state                                      56      38     -18
dnsd_main                                           1321    1303     -18
base_device                                          179     158     -21
find_keyword                                         104      82     -22
handle_incoming_and_exit                            2785    2762     -23
parse_and_put_prompt                                 774     746     -28
modinfo                                              347     317     -30
find_action                                          204     171     -33
update_passwd                                       1470    1436     -34
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540)         Total: -522 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 17:48:34 +01:00

178 lines
4.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* modinfo - retrieve module info
* Copyright (c) 2008 Pascal Bellard
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//applet:IF_MODINFO(APPLET(modinfo, BB_DIR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o modutils.o
//config:config MODINFO
//config: bool "modinfo"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Show information about a Linux Kernel module
#include <fnmatch.h>
#include <sys/utsname.h> /* uname() */
#include "libbb.h"
#include "modutils.h"
enum {
OPT_TAGS = (1 << 12) - 1, /* shortcut count */
OPT_F = (1 << 12), /* field name */
OPT_0 = (1 << 13), /* \0 as separator */
};
struct modinfo_env {
char *field;
int tags;
};
static void display(const char *data, const char *pattern, int flag)
{
if (flag) {
int n = printf("%s:", pattern);
while (n++ < 16)
bb_putchar(' ');
}
printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
}
static void modinfo(const char *path, const char *version,
const struct modinfo_env *env)
{
static const char *const shortcuts[] = {
"filename",
"license",
"author",
"description",
"version",
"alias",
"srcversion",
"depends",
"uts_release",
"vermagic",
"parm",
"firmware",
};
size_t len;
int j;
char *ptr, *the_module;
const char *field = env->field;
int tags = env->tags;
if (tags & 1) { /* filename */
display(path, shortcuts[0], 1 != tags);
}
len = MAXINT(ssize_t);
the_module = xmalloc_open_zipped_read_close(path, &len);
if (!the_module) {
if (path[0] == '/')
return;
/* Newer depmod puts relative paths in modules.dep */
path = xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, version, path);
the_module = xmalloc_open_zipped_read_close(path, &len);
free((char*)path);
if (!the_module)
return;
}
if (field)
tags |= OPT_F;
for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
const char *pattern;
if (!((1<<j) & tags))
continue;
pattern = field;
if ((1<<j) & OPT_TAGS)
pattern = shortcuts[j];
ptr = the_module;
while (1) {
char *after_pattern;
ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
if (ptr == NULL) /* no occurance left, done */
break;
after_pattern = is_prefixed_with(ptr, pattern);
if (after_pattern && *after_pattern == '=') {
/* field prefixes are 0x80 or 0x00 */
if ((ptr[-1] & 0x7F) == 0x00) {
ptr = after_pattern + 1;
display(ptr, pattern, (1<<j) != tags);
ptr += strlen(ptr);
}
}
++ptr;
}
}
free(the_module);
}
//usage:#define modinfo_trivial_usage
//usage: "[-adlp0] [-F keyword] MODULE"
//usage:#define modinfo_full_usage "\n\n"
//usage: " -a Shortcut for '-F author'"
//usage: "\n -d Shortcut for '-F description'"
//usage: "\n -l Shortcut for '-F license'"
//usage: "\n -p Shortcut for '-F parm'"
//usage: "\n -F keyword Keyword to look for"
//usage: "\n -0 Separate output with NULs"
//usage:#define modinfo_example_usage
//usage: "$ modinfo -F vermagic loop\n"
int modinfo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int modinfo_main(int argc UNUSED_PARAM, char **argv)
{
struct modinfo_env env;
char name[MODULE_NAME_LEN];
struct utsname uts;
parser_t *parser;
char *colon, *tokens[2];
unsigned opts;
unsigned i;
env.field = NULL;
opt_complementary = "-1"; /* minimum one param */
opts = getopt32(argv, "nladvAsDumpF:0", &env.field);
env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
argv += optind;
uname(&uts);
parser = config_open2(
xasprintf("%s/%s/%s", CONFIG_DEFAULT_MODULES_DIR, uts.release, CONFIG_DEFAULT_DEPMOD_FILE),
xfopen_for_read
);
while (config_read(parser, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
colon = last_char_is(tokens[0], ':');
if (colon == NULL)
continue;
*colon = '\0';
filename2modname(bb_basename(tokens[0]), name);
for (i = 0; argv[i]; i++) {
if (fnmatch(argv[i], name, 0) == 0) {
modinfo(tokens[0], uts.release, &env);
argv[i] = (char *) "";
}
}
}
if (ENABLE_FEATURE_CLEAN_UP)
config_close(parser);
for (i = 0; argv[i]; i++) {
if (argv[i][0]) {
modinfo(argv[i], uts.release, &env);
}
}
return 0;
}