- 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

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;
+}