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>

diff --git a/modutils/Config.src b/modutils/Config.src
index 3d02f87..2ced9b3 100644 (file)
--- a/modutils/Config.src
+++ b/modutils/Config.src
@@ -5,6 +5,8 @@
 
 menu "Linux Module Utilities"
 
+INSERT
+
 config MODPROBE_SMALL
        bool "Simplified modutils"
        default y

diff --git a/modutils/Kbuild.src b/modutils/Kbuild.src
index 31f7cbf..fc0808d 100644 (file)
--- a/modutils/Kbuild.src
+++ b/modutils/Kbuild.src
@@ -5,6 +5,7 @@
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
 lib-y:=
+INSERT
 lib-$(CONFIG_MODPROBE_SMALL)      += modprobe-small.o
 lib-$(CONFIG_DEPMOD)              += depmod.o modutils.o
 lib-$(CONFIG_INSMOD)              += insmod.o modutils.o

diff --git a/modutils/modinfo.c b/modutils/modinfo.c
new file mode 100644 (file)
index 0000000..c68d2e9
--- /dev/null
+++ b/modutils/modinfo.c
@@ -0,0 +1,150 @@
+/* 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 tarball for details.
+ */
+
+//applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_MODINFO) += modinfo.o
+
+//config:config MODINFO
+//config:      bool "modinfo"
+//config:      default y
+//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 << 6) - 1,
+       OPT_F = (1 << 6), /* field name */
+       OPT_0 = (1 << 7),  /* \0 as separator */
+};
+
+struct modinfo_env {
+       char *field;
+       int tags;
+};
+
+static int display(const char *data, const char *pattern, int flag)
+{
+       if (flag) {
+               int n = printf("%s:", pattern);
+               while (n++ < 16)
+                       bb_putchar(' ');
+       }
+       return printf("%s%c", data, (option_mask32 & OPT_0) ? '\0' : '\n');
+}
+
+static void modinfo(const char *path, struct modinfo_env *env)
+{
+       static const char *const shortcuts[] = {
+               "filename",
+               "description",
+               "author",
+               "license",
+               "vermagic",
+               "parm",
+       };
+       size_t len;
+       int j, length;
+       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)
+               return;
+       if (field)
+               tags |= OPT_F;
+       for (j = 1; (1<<j) & (OPT_TAGS + OPT_F); j++) {
+               const char *pattern = field;
+               if ((1<<j) & OPT_TAGS)
+                       pattern = shortcuts[j];
+               if (!((1<<j) & tags))
+                       continue;
+               length = strlen(pattern);
+               ptr = the_module;
+               while (1) {
+                       ptr = memchr(ptr, *pattern, len - (ptr - (char*)the_module));
+                       if (ptr == NULL) /* no occurance left, done */
+                               break;
+                       if (strncmp(ptr, pattern, length) == 0 && ptr[length] == '=') {
+                               ptr += length + 1;
+                               ptr += display(ptr, pattern, (1<<j) != tags);
+                       }
+                       ++ptr;
+               }
+       }
+       free(the_module);
+}
+
+//usage:#define modinfo_trivial_usage
+//usage:       "[-adlp0] [-F keyword] MODULE"
+//usage:#define modinfo_full_usage "\n\n"
+//usage:       "Options:"
+//usage:     "\n       -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 *p;
+       char *colon, *tokens[2];
+       unsigned opts;
+       unsigned i;
+
+       env.field = NULL;
+       opt_complementary = "-1"; /* minimum one param */
+       opts = getopt32(argv, "fdalvpF:0", &env.field);
+       env.tags = opts & OPT_TAGS ? opts & OPT_TAGS : OPT_TAGS;
+       argv += optind;
+
+       uname(&uts);
+       p = config_open2(
+               concat_path_file(
+                       concat_path_file(CONFIG_DEFAULT_MODULES_DIR, uts.release),
+                       CONFIG_DEFAULT_DEPMOD_FILE),
+               xfopen_for_read
+       );
+
+       while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
+               colon = last_char_is(tokens[0], ':');
+               if (colon == NULL)
+                       continue;
+               *colon = '\0';
+               filename2modname(tokens[0], name);
+               for (i = 0; argv[i]; i++) {
+                       if (fnmatch(argv[i], name, 0) == 0) {
+                               modinfo(tokens[0], &env);
+                               argv[i] = (char *) "";
+                       }
+               }
+       }
+       for (i = 0; argv[i]; i++) {
+               if (argv[i][0]) {
+                       modinfo(argv[i], &env);
+               }
+       }
+       return 0;
+}