firewire: core: document fw_csr_string's truncation of long strings
fw_csr_string() truncates and terminates target strings like strlcpy()
does. Unlike strlcpy(), it returns the target strlen, not the source
strlen, hence users of fw_csr_string() are unable to detect truncation.
Point this behavior out in the kerneldoc comment.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 2c6d5e1..f9e3aee 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -115,6 +115,9 @@
*
* The string is taken from a minimal ASCII text descriptor leaf after
* the immediate entry with @key. The string is zero-terminated.
+ * An overlong string is silently truncated such that it and the
+ * zero byte fit into @size.
+ *
* Returns strlen(buf) or a negative error code.
*/
int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)