Commit 3478cfcf authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Andrii Nakryiko

bpf: Support "%c" in bpf_bprintf_prepare().

/proc/net/unix uses "%c" to print a single-byte character to escape '\0' in
the name of the abstract UNIX domain socket.  The following selftest uses
it, so this patch adds support for "%c".  Note that it does not support
wide character ("%lc" and "%llc") for simplicity.
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210814015718.42704-3-kuniyu@amazon.co.jp
parent 2c860a43
...@@ -907,6 +907,20 @@ int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args, ...@@ -907,6 +907,20 @@ int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
tmp_buf += err; tmp_buf += err;
num_spec++; num_spec++;
continue;
} else if (fmt[i] == 'c') {
if (!tmp_buf)
goto nocopy_fmt;
if (tmp_buf_end == tmp_buf) {
err = -ENOSPC;
goto out;
}
*tmp_buf = raw_args[num_spec];
tmp_buf++;
num_spec++;
continue; continue;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment