linux-kernel - [PATCH v2 11/14] seq_file: Introduce seq_escape

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Message-Id: <20210504102648.88057-12-andriy.shevchenko@linux.intel.com>
Date:   Tue,  4 May 2021 13:26:45 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "J. Bruce Fields" <bfields@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     "J. Bruce Fields" <bfields@...ldses.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Shevchenko <andy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 11/14] seq_file: Introduce seq_escape_mem()

Introduce seq_escape_mem() to allow users to pass additional parameters
to string_escape_mem().

Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 fs/seq_file.c            | 25 +++++++++++++++++++++++++
 include/linux/seq_file.h |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 5059248f2d64..532cac2eae0f 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -355,6 +355,31 @@ int seq_release(struct inode *inode, struct file *file)
 }
 EXPORT_SYMBOL(seq_release);
 
+/**
+ * seq_escape_mem - print data into buffer, escaping some characters
+ * @m: target buffer
+ * @src: source buffer
+ * @len: size of source buffer
+ * @flags: flags to pass to string_escape_mem()
+ * @esc: set of characters that need escaping
+ *
+ * Puts data into buffer, replacing each occurrence of character from
+ * given class (defined by @flags and @esc) with printable escaped sequence.
+ *
+ * Use seq_has_overflowed() to check for errors.
+ */
+void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
+		    unsigned int flags, const char *esc)
+{
+	char *buf;
+	size_t size = seq_get_buf(m, &buf);
+	int ret;
+
+	ret = string_escape_mem(src, len, buf, size, flags, esc);
+	seq_commit(m, ret < size ? ret : -1);
+}
+EXPORT_SYMBOL(seq_escape_mem);
+
 /**
  *	seq_escape -	print string into buffer, escaping some characters
  *	@m:	target buffer
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 723b1fa1177e..6de442182784 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -126,6 +126,8 @@ void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num
 void seq_put_hex_ll(struct seq_file *m, const char *delimiter,
 		    unsigned long long v, unsigned int width);
 
+void seq_escape_mem(struct seq_file *m, const char *src, size_t len,
+		    unsigned int flags, const char *esc);
 void seq_escape(struct seq_file *m, const char *s, const char *esc);
 void seq_escape_mem_ascii(struct seq_file *m, const char *src, size_t isz);
 
-- 
2.30.2