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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-09-13 14:59:38 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-09-13 14:59:38 +0000
commitba1315d0fbe7fa43aa7481b5d6e92bd03b0152d5 (patch)
treeb5b295f5382bd71c6184539feabf0ba061897131 /modutils/modutils.c
parent4f3209b9d4b24ebe9b76e3bfe8ddd87af5228af9 (diff)
downloadbusybox-ba1315d0fbe7fa43aa7481b5d6e92bd03b0152d5.tar.gz
busybox-ba1315d0fbe7fa43aa7481b5d6e92bd03b0152d5.tar.bz2
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
Diffstat (limited to 'modutils/modutils.c')
-rw-r--r--modutils/modutils.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/modutils/modutils.c b/modutils/modutils.c
new file mode 100644
index 000000000..18ea5374e
--- /dev/null
+++ b/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);
+}