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authorBernhard Reutner-Fischer2008-05-26 12:01:49 +0000
committerBernhard Reutner-Fischer2008-05-26 12:01:49 +0000
commit55e547eb6fad0d3ced00a62f04160016d90baabe (patch)
treeecfd0a9d9a662c807ecb881d8e683fc22e7d6d17 /modutils/depmod.c
parenta0e17f7df6d4c65ecab7339e9899b294ff8bc04e (diff)
downloadbusybox-55e547eb6fad0d3ced00a62f04160016d90baabe.zip
busybox-55e547eb6fad0d3ced00a62f04160016d90baabe.tar.gz
- add simple first-draft unoptimized depmod just to proove Vladimir Dronnikov wrong
text data bss dec hex filename 569 0 0 569 239 modutils/depmod.o
Diffstat (limited to 'modutils/depmod.c')
-rw-r--r--modutils/depmod.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/modutils/depmod.c b/modutils/depmod.c
new file mode 100644
index 0000000..9131dc1
--- /dev/null
+++ b/modutils/depmod.c
@@ -0,0 +1,116 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * depmod - generate modules.dep
+ * Copyright (c) 2008 Bernhard Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#undef _GNU_SOURCE
+#define _GNU_SOURCE
+#include <libbb.h>
+#include <sys/utsname.h> /* uname() */
+
+struct globals {
+ llist_t *lst;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+/* We have to zero it out because of NOEXEC */
+#define INIT_G() memset(&G, 0, sizeof(G))
+
+static int fill_lst(const char *modulename, struct stat ATTRIBUTE_UNUSED *sb,
+ void ATTRIBUTE_UNUSED *data, int ATTRIBUTE_UNUSED depth)
+{
+ llist_add_to_end(&G.lst, strdup(modulename));
+ return TRUE;
+}
+
+static int fileAction(const char *fname, struct stat ATTRIBUTE_UNUSED *sb,
+ void *data, int ATTRIBUTE_UNUSED depth)
+{
+ size_t seen = 0;
+ size_t len = MAXINT(ssize_t);
+ void *the_module = xmalloc_open_read_close(fname, &len), *ptr = the_module;
+ const char *deps;
+ RESERVE_CONFIG_BUFFER(depends, 512);
+ RESERVE_CONFIG_BUFFER(buf1, 512);
+
+ memset(buf1, 0, sizeof(buf1));
+ memset(depends, 0, sizeof(depends));
+ sprintf(buf1, "\n%s:", fname);
+
+ if (last_char_is(fname, 'o') == NULL) /* not a module */
+ goto done;
+ write((int)data, buf1, strlen(buf1));
+//bb_info_msg("[%d] fname='%s'", (int)data, fname);
+ do {
+ /* search for a 'd' */
+ ptr = memchr(ptr, 'd', len - seen);
+ if (ptr == NULL) /* no d left, done */
+ break;
+ if (sscanf(ptr, "depends=%s", depends) == 1)
+ break;
+ seen = ++ptr - the_module;
+ } while (1);
+//bb_info_msg(" depends='%s'", depends);
+ deps = depends;
+ while (*deps) {
+ llist_t * _lst = G.lst;
+ ptr = memchr(deps, ',', strlen(deps));
+ if (ptr != NULL)
+ *(char*)ptr = '\0';
+ /* remember the length of the current dependency plus eventual 0 byte */
+ len = strlen(deps) + (ptr != NULL);
+ sprintf(buf1, "/%s.", deps); /* make sure we match the correct file */
+ while (_lst) {
+ ptr = strstr(_lst->data, buf1);
+ if (ptr != NULL)
+ break; /* found it */
+ _lst = _lst->link;
+ }
+ if (_lst && _lst->data) {
+ const char separator = ' ';
+//bb_info_msg("[%s] -> '%s'", deps, _lst->data);
+ write((int)data, &separator, 1);
+ write((int)data, _lst->data, strlen(_lst->data));
+
+ deps += len;
+ }
+ }
+done:
+ RELEASE_CONFIG_BUFFER(depends);
+ RELEASE_CONFIG_BUFFER(buf1);
+ free(the_module);
+ return TRUE;
+}
+
+int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int depmod_main(int ATTRIBUTE_UNUSED argc, char **argv)
+{
+ int retval = EXIT_SUCCESS;
+// static const char moddir_base[] ALIGN1 = "/lib/modules/%s";
+
+ int fd = xopen3("/tmp/modules.dep", O_CREAT|O_WRONLY|O_TRUNC,
+ S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
+ argv++;
+ do {
+ if (!recursive_action(*argv,
+ ACTION_RECURSE, /* flags */
+ fill_lst, /* file action */
+ NULL, /* dir action */
+ NULL, /* user data */
+ 0) || /* depth */
+ !recursive_action(*argv,
+ ACTION_RECURSE, /* flags */
+ fileAction, /* file action */
+ NULL, /* dir action */
+ (void*)fd, /* user data */
+ 0)) { /* depth */
+ retval = EXIT_FAILURE;
+ }
+ } while (*++argv);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+ return retval;
+}