parser: add unsigned int parser

Will be used by fs parsing options

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Robbie Ko<[e-mail]>
Reviewed-by: Chung-Chiang Cheng <[e-mail]>
Signed-off-by: BingJing Chang <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

include/linux/parser.h

···
 
 int match_token(char *, const match_table_t table, substring_t args[]);
 int match_int(substring_t *, int *result);
+int match_uint(substring_t *s, unsigned int *result);
 int match_u64(substring_t *, u64 *result);
 int match_octal(substring_t *, int *result);
 int match_hex(substring_t *, int *result);

lib/parser.c

···
 }
 EXPORT_SYMBOL(match_int);
 
+/*
+ * match_uint - scan a decimal representation of an integer from a substring_t
+ * @s: substring_t to be scanned
+ * @result: resulting integer on success
+ *
+ * Description: Attempts to parse the &substring_t @s as a decimal integer. On
+ * success, sets @result to the integer represented by the string and returns 0.
+ * Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ */
+int match_uint(substring_t *s, unsigned int *result)
+{
+	int err = -ENOMEM;
+	char *buf = match_strdup(s);
+
+	if (buf) {
+		err = kstrtouint(buf, 10, result);
+		kfree(buf);
+	}
+	return err;
+}
+EXPORT_SYMBOL(match_uint);
+
 /**
  * match_u64: - scan a decimal representation of a u64 from
  *                  a substring_t