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Subject[PATCH bpf-next v2 1/2] seq_file: Add a seq_bprintf function
Date
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>
---
fs/seq_file.c | 18 ++++++++++++++++++
include/linux/seq_file.h | 4 ++++
2 files changed, 22 insertions(+)

diff --git a/fs/seq_file.c b/fs/seq_file.c
index cb11a34fb871..5059248f2d64 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -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
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index b83b3ae3c877..723b1fa1177e 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -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) \
{ \
--
2.31.1.498.g6c1eba8ee3d-goog
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