session: simplify read_session

Simplify the function read_session and provide some error checking. This
function should now return -1 if a valid session with the given ID
cannot be found.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/server/src/session.c b/server/src/session.c
index 74b29a7..e01dc34 100644
--- a/server/src/session.c
+++ b/server/src/session.c
@@ -35,6 +35,7 @@ void write_session(int id, const char *data, size_t size) {
 
 size_t read_session(int id, char *data, size_t size) {
         struct session *ses = find_session(id);
-        size_t bytes = read(ses->socket, data, size);
-        return bytes;
+        if (ses == NULL)
+                return -1;
+        return read(ses->socket, data, size);
 }