modutils/*: rewrite by Timo Teras <timo.teras AT iki.fi>

- a lot faster (linear algorithmic complexity, smaller memory foot print)
- a lot smaller (the old code was overly complicated)
- loading of aliases is now module-init-tools compliant
- blacklisting is done correctly (-b option added)
- module argument quoting done right
- depmod now correctly generates modules.symbols and modules.alias

add/remove: 16/21 grow/shrink: 4/6 up/down: 6930/-9316 Total: -2386 bytes
   text    data     bss     dec     hex filename
 806039     592    6680  813311   c68ff busybox_old
 803498     592    6676  810766   c5f0e busybox_unstripped

modutils/modutils.c

@@ -0,0 +1,141 @@
+/*
+ * Common modutils related functions for busybox
+ *
+ * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "modutils.h"
+
+#ifdef __UCLIBC__
+extern int init_module(void *module, unsigned long len, const char *options);
+extern int delete_module(const char *module, unsigned int flags);
+#else
+# include <sys/syscall.h>
+# define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
+# define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
+#endif
+
+USE_FEATURE_2_4_MODULES(char *insmod_outputname);
+
+/*
+ a libbb candidate from ice age!
+*/
+llist_t FAST_FUNC *llist_find(llist_t *first, const char *str)
+{
+	while (first != NULL) {
+		if (strcmp(first->data, str) == 0)
+			return first;
+		first = first->link;
+	}
+	return NULL;
+}
+
+void FAST_FUNC replace(char *s, char what, char with)
+{
+	while (*s) {
+		if (what == *s)
+			*s = with;
+		++s;
+	}
+}
+
+char * FAST_FUNC replace_underscores(char *s)
+{
+	replace(s, '-', '_');
+	return s;
+}
+
+int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
+{
+	char *tok;
+	int len = 0;
+
+	while ((tok = strsep(&string, delim)) != NULL) {
+		if (tok[0] == '\0')
+			continue;
+		llist_add_to_end(llist, xstrdup(tok));
+		len += strlen(tok);
+	}
+	return len;
+}
+
+char * FAST_FUNC filename2modname(const char *filename, char *modname)
+{
+	int i;
+	char *from;
+
+	if (filename == NULL)
+		return NULL;
+	if (modname == NULL)
+		modname = xmalloc(MODULE_NAME_LEN);
+	from = bb_get_last_path_component_nostrip(filename);
+	for (i = 0; i < MODULE_NAME_LEN && from[i] != '\0' && from[i] != '.'; i++)
+		modname[i] = (from[i] == '-') ? '_' : from[i];
+	modname[i] = 0;
+
+	return modname;
+}
+
+const char * FAST_FUNC moderror(int err)
+{
+	switch (err) {
+	case -1:
+		return "no such module";
+	case ENOEXEC:
+		return "invalid module format";
+	case ENOENT:
+		return "unknown symbol in module, or unknown parameter";
+	case ESRCH:
+		return "module has wrong symbol version";
+	case ENOSYS:
+		return "kernel does not support requested operation";
+	default:
+		return strerror(err);
+	}
+}
+
+char * FAST_FUNC parse_cmdline_module_options(char **argv)
+{
+	char *options;
+	int optlen;
+
+	options = xzalloc(1);
+	optlen = 0;
+	while (*++argv) {
+		options = xrealloc(options, optlen + 2 + strlen(*argv) + 2);
+		/* Spaces handled by "" pairs, but no way of escaping quotes */
+		optlen += sprintf(options + optlen, (strchr(*argv,' ') ? "\"%s\" " : "%s "), *argv);
+	}
+	return options;
+}
+
+int FAST_FUNC bb_init_module(const char *filename, const char *options)
+{
+	size_t len = MAXINT(ssize_t);
+	char *image;
+	int rc = ENOENT;
+
+#if ENABLE_FEATURE_2_4_MODULES
+	if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
+		return bb_init_module_24(filename, options);
+#endif
+
+	/* Use the 2.6 way */
+	image = (char *) xmalloc_open_zipped_read_close(filename, &len);
+	if (image) {
+		if (init_module(image, len, options) != 0)
+			rc = errno;
+		else
+			rc = 0;
+		free(image);
+	}
+
+	return rc;
+}
+
+int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
+{
+	return delete_module(module, flags);
+}