linux-kernel - [PATCH v3 1/3] parser: add unsigned int parser

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Message-Id: <20210129045242.10268-1-bingjingc@synology.com>
Date:   Fri, 29 Jan 2021 12:52:42 +0800
From:   bingjingc <bingjingc@...ology.com>
To:     viro@...iv.linux.org.uk, jack@...e.com, jack@...e.cz,
        axboe@...nel.dk, linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, cccheng@...ology.com,
        bingjingc@...ology.com, robbieko@...ology.com, willy@...radead.org,
        rdunlap@...radead.org, miklos@...redi.hu
Subject: [PATCH v3 1/3] parser: add unsigned int parser

From: BingJing Chang <bingjingc@...ology.com>

Will be used by fs parsing options

Reviewed-by: Robbie Ko<robbieko@...ology.com>
Reviewed-by: Chung-Chiang Cheng <cccheng@...ology.com>
Signed-off-by: BingJing Chang <bingjingc@...ology.com>
---
 include/linux/parser.h |  1 +
 lib/parser.c           | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/linux/parser.h b/include/linux/parser.h
index 89e2b23..dd79f45 100644
--- a/include/linux/parser.h
+++ b/include/linux/parser.h
@@ -29,6 +29,7 @@ typedef struct {
 
 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);
diff --git a/lib/parser.c b/lib/parser.c
index f5b3e5d..7785e41 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
-- 
2.7.4