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>

3 files changed, 153 insertions, 0 deletions

diff --git a/modutils/Config.src b/modutils/Config.src
index 3d02f87ee..2ced9b308 100644
--- 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 31f7cbf93..fc0808d7f 100644
--- 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-$(CONFIG_INSMOD)              += insmod.o modutils.o
diff --git a/modutils/modinfo.c b/modutils/modinfo.c
new file mode 100644
index 000000000..c68d2e974
--- /dev/null
+++ b/modutils/modinfo.c
@@ -0,0 +1,150 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * modinfo - retrieve module info
+ * Copyright (c) 2008 Pascal Bellard
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+//applet:IF_MODINFO(APPLET(modinfo, _BB_DIR_SBIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(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;
+}