[PATCH 2/4] seq_file: add function to write binary data

[Peter Oberparleiter <oberpar@linux.vnet.ibm.com>]

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From: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>

seq_write() can be used to construct seq_files containing arbitrary
data. Required by the gcov-profiling interface to synthesize binary
profiling data files.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
---

 fs/seq_file.c            |   20 ++++++++++++++++++++
 include/linux/seq_file.h |    1 +
 2 files changed, 21 insertions(+)

Index: linux-2.6.30-rc7/fs/seq_file.c
===================================================================
--- linux-2.6.30-rc7.orig/fs/seq_file.c	2009-06-02 10:34:35.000000000 +0200
+++ linux-2.6.30-rc7/fs/seq_file.c	2009-06-02 10:35:24.000000000 +0200
@@ -640,6 +640,26 @@
 }
 EXPORT_SYMBOL(seq_puts);
 
+/**
+ * seq_write - write arbitrary data to buffer
+ * @seq: seq_file identifying the buffer to which data should be written
+ * @data: data address
+ * @len: number of bytes
+ *
+ * Return 0 on success, non-zero otherwise.
+ */
+int seq_write(struct seq_file *seq, const void *data, size_t len)
+{
+	if (seq->count + len < seq->size) {
+		memcpy(seq->buf + seq->count, data, len);
+		seq->count += len;
+		return 0;
+	}
+	seq->count = seq->size;
+	return -1;
+}
+EXPORT_SYMBOL(seq_write);
+
 struct list_head *seq_list_start(struct list_head *head, loff_t pos)
 {
 	struct list_head *lh;
Index: linux-2.6.30-rc7/include/linux/seq_file.h
===================================================================
--- linux-2.6.30-rc7.orig/include/linux/seq_file.h	2009-06-02 10:34:43.000000000 +0200
+++ linux-2.6.30-rc7/include/linux/seq_file.h	2009-06-02 10:35:24.000000000 +0200
@@ -43,6 +43,7 @@
 int seq_escape(struct seq_file *, const char *, const char *);
 int seq_putc(struct seq_file *m, char c);
 int seq_puts(struct seq_file *m, const char *s);
+int seq_write(struct seq_file *seq, const void *data, size_t len);
 
 int seq_printf(struct seq_file *, const char *, ...)
 	__attribute__ ((format (printf,2,3)));