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seq_file: Add a seq_bprintf function

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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: Florent Revest <revest@chromium.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210427174313.860948-2-revest@chromium.org
This commit is contained in:
Florent Revest 2021-04-27 19:43:12 +02:00 committed by Alexei Starovoitov
parent 2551c2d19c
commit 76d6a13383
2 changed files with 22 additions and 0 deletions
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18
fs/seq_file.c
View File

@ -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

4
include/linux/seq_file.h
View File

@ -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) \
{ \