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Commit 0b923606 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Linus Torvalds
Browse files

seq_file: add function to write binary data 



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: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Li Wei <W.Li@Sun.COM>
Cc: Michael Ellerman <michaele@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Heiko Carstens <heicars2@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <mschwid2@linux.vnet.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b99b87f7

fs/seq_file.c

+20 −0
Original line number Diff line number Diff line
@@ -640,6 +640,26 @@ int seq_puts(struct seq_file *m, const char *s) 
}

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;

include/linux/seq_file.h

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ int seq_release(struct inode *, struct file *); 
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)));