parser: add u64 number parser
Will be used by the nvme-fabrics FC transport in parsing options
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
diff --git a/lib/parser.c b/lib/parser.c
index b6d1163..3278958 100644
--- a/lib/parser.c
+++ b/lib/parser.c
@@ -152,6 +152,36 @@
}
/**
+ * match_u64int: scan a number in the given base from a substring_t
+ * @s: substring to be scanned
+ * @result: resulting u64 on success
+ * @base: base to use when converting string
+ *
+ * Description: Given a &substring_t and a base, attempts to parse the substring
+ * as a number in that base. On success, sets @result to the integer represented
+ * by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
+ */
+static int match_u64int(substring_t *s, u64 *result, int base)
+{
+ char *buf;
+ int ret;
+ u64 val;
+ size_t len = s->to - s->from;
+
+ buf = kmalloc(len + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ memcpy(buf, s->from, len);
+ buf[len] = '\0';
+
+ ret = kstrtoull(buf, base, &val);
+ if (!ret)
+ *result = val;
+ kfree(buf);
+ return ret;
+}
+
+/**
* match_int: - scan a decimal representation of an integer from a substring_t
* @s: substring_t to be scanned
* @result: resulting integer on success
@@ -167,6 +197,23 @@
EXPORT_SYMBOL(match_int);
/**
+ * match_u64: - scan a decimal representation of a u64 from
+ * a substring_t
+ * @s: substring_t to be scanned
+ * @result: resulting unsigned long long on success
+ *
+ * Description: Attempts to parse the &substring_t @s as a long 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_u64(substring_t *s, u64 *result)
+{
+ return match_u64int(s, result, 0);
+}
+EXPORT_SYMBOL(match_u64);
+
+/**
* match_octal: - scan an octal representation of an integer from a substring_t
* @s: substring_t to be scanned
* @result: resulting integer on success