Litmus core: add copy_and_chomp() helper

We read in a line from userspace and remove the trailing newline in a
number of places. This function extracts the common code to avoid
future duplication.

1 files changed, 6 insertions, 0 deletions

diff --git a/include/litmus/litmus_proc.h b/include/litmus/litmus_proc.h
index fbc0082b2d2..6800e725d48 100644
--- a/include/litmus/litmus_proc.h
+++ b/include/litmus/litmus_proc.h
@@ -17,3 +17,9 @@ long make_plugin_proc_dir(struct sched_plugin* plugin,
  */
 void remove_plugin_proc_dir(struct sched_plugin* plugin);
 
+
+/* Copy at most size-1 bytes from ubuf into kbuf, null-terminate buf, and
+ * remove a '\n' if present. Returns the number of bytes that were read or
+ * -EFAULT. */
+int copy_and_chomp(char *kbuf, unsigned long ksize,
+                   __user const char* ubuf, unsigned long ulength);