apparmor: add lib fn to find the "split" for fqnames
Signed-off-by: John Johansen <john.johansen@canonical.com>
diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
index e29ccdb..fec78ee 100644
--- a/security/apparmor/lib.c
+++ b/security/apparmor/lib.c
@@ -12,6 +12,7 @@
* License.
*/
+#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -61,6 +62,58 @@
}
/**
+ * skipn_spaces - Removes leading whitespace from @str.
+ * @str: The string to be stripped.
+ *
+ * Returns a pointer to the first non-whitespace character in @str.
+ * if all whitespace will return NULL
+ */
+
+static const char *skipn_spaces(const char *str, size_t n)
+{
+ for (; n && isspace(*str); --n)
+ ++str;
+ if (n)
+ return (char *)str;
+ return NULL;
+}
+
+const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name,
+ size_t *ns_len)
+{
+ const char *end = fqname + n;
+ const char *name = skipn_spaces(fqname, n);
+
+ if (!name)
+ return NULL;
+ *ns_name = NULL;
+ *ns_len = 0;
+ if (name[0] == ':') {
+ char *split = strnchr(&name[1], end - &name[1], ':');
+ *ns_name = skipn_spaces(&name[1], end - &name[1]);
+ if (!*ns_name)
+ return NULL;
+ if (split) {
+ *ns_len = split - *ns_name;
+ if (*ns_len == 0)
+ *ns_name = NULL;
+ split++;
+ if (end - split > 1 && strncmp(split, "//", 2) == 0)
+ split += 2;
+ name = skipn_spaces(split, end - split);
+ } else {
+ /* a ns name without a following profile is allowed */
+ name = NULL;
+ *ns_len = end - *ns_name;
+ }
+ }
+ if (name && *name == 0)
+ name = NULL;
+
+ return name;
+}
+
+/**
* aa_info_message - log a none profile related status message
* @str: message to log
*/