parser: add unsigned int parser

Will be used by fs parsing options

Link: https://lore.kernel.org/r/20210129045242.10268-1-bingjingc@synology.com
Reviewed-by: Robbie Ko<robbieko@synology.com>
Reviewed-by: Chung-Chiang Cheng <cccheng@synology.com>
Signed-off-by: BingJing Chang <bingjingc@synology.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/parser.c b/lib/parser.c
index f5b3e5d7a7f9..7785e41fa5eb 100644
--- a/lib/parser.c
+++ b/lib/parser.c
@@ -188,6 +188,28 @@ int match_int(substring_t *s, int *result)
 }
 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