1 files changed, 64 insertions, 0 deletions
diff --git a/fs/smbfs/getopt.c b/fs/smbfs/getopt.c
new file mode 100644
index 000000000000..7ae0f5273ab1
--- /dev/null
+++ b/fs/smbfs/getopt.c
@@ -0,0 +1,64 @@
+/*
+ * getopt.c
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/net.h>
+
+#include "getopt.h"
+
+/**
+ *	smb_getopt - option parser
+ *	@caller: name of the caller, for error messages
+ *	@options: the options string
+ *	@opts: an array of &struct option entries controlling parser operations
+ *	@optopt: output; will contain the current option
+ *	@optarg: output; will contain the value (if one exists)
+ *	@flag: output; may be NULL; should point to a long for or'ing flags
+ *	@value: output; may be NULL; will be overwritten with the integer value
+ *		of the current argument.
+ *
+ *	Helper to parse options on the format used by mount ("a=b,c=d,e,f").
+ *	Returns opts->val if a matching entry in the 'opts' array is found,
+ *	0 when no more tokens are found, -1 if an error is encountered.
+ */
+int smb_getopt(char *caller, char **options, struct option *opts,
+	       char **optopt, char **optarg, unsigned long *flag,
+	       unsigned long *value)
+{
+	char *token;
+	char *val;
+	int i;
+
+	do {
+		if ((token = strsep(options, ",")) == NULL)
+			return 0;
+	} while (*token == '\0');
+	*optopt = token;
+
+	*optarg = NULL;
+	if ((val = strchr (token, '=')) != NULL) {
+		*val++ = 0;
+		if (value)
+			*value = simple_strtoul(val, NULL, 0);
+		*optarg = val;
+	}
+
+	for (i = 0; opts[i].name != NULL; i++) {
+		if (!strcmp(opts[i].name, token)) {
+			if (!opts[i].flag && (!val || !*val)) {
+				printk("%s: the %s option requires an argument\n",
+				       caller, token);
+				return -1;
+			}
+
+			if (flag && opts[i].flag)
+				*flag |= opts[i].flag;
+
+			return opts[i].val;
+		}
+	}
+	printk("%s: Unrecognized mount option %s\n", caller, token);
+	return -1;
+}