Commit 76d6a133 authored by Florent Revest's avatar Florent Revest Committed by Alexei Starovoitov
Browse files

seq_file: Add a seq_bprintf function 



Similarly to seq_buf_bprintf in lib/seq_buf.c, this function writes a
printf formatted string with arguments provided in a "binary
representation" built by functions such as vbin_printf.

Signed-off-by: default avatarFlorent Revest <revest@chromium.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210427174313.860948-2-revest@chromium.org
parent 2551c2d1

fs/seq_file.c

+18 −0
Original line number Diff line number Diff line
@@ -412,6 +412,24 @@ void seq_printf(struct seq_file *m, const char *f, ...) 
}

EXPORT_SYMBOL(seq_printf);



#ifdef CONFIG_BINARY_PRINTF

void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary)

{

	int len;



	if (m->count < m->size) {

		len = bstr_printf(m->buf + m->count, m->size - m->count, f,

				  binary);

		if (m->count + len < m->size) {

			m->count += len;

			return;

		}

	}

	seq_set_overflow(m);

}

EXPORT_SYMBOL(seq_bprintf);

#endif /* CONFIG_BINARY_PRINTF */



/**

 *	mangle_path -	mangle and copy path to buffer beginning

 *	@s: buffer start

include/linux/seq_file.h

+4 −0
Original line number Diff line number Diff line
@@ -146,6 +146,10 @@ void *__seq_open_private(struct file *, const struct seq_operations *, int); 
int seq_open_private(struct file *, const struct seq_operations *, int);

int seq_release_private(struct inode *, struct file *);



#ifdef CONFIG_BINARY_PRINTF

void seq_bprintf(struct seq_file *m, const char *f, const u32 *binary);

#endif



#define DEFINE_SEQ_ATTRIBUTE(__name)					\

static int __name ## _open(struct inode *inode, struct file *file)	\

{									\