proc: do not declare empty process variables

If a HTTP header variable has no corresponding value, then do not set it
to the empty string but to NULL, so that cgi.c will later skip it when
setting up the process environment.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/proc.c b/proc.c
index 4819e08..a8a7142 100644 (file)
--- a/proc.c
+++ b/proc.c
@@ -162,7 +162,7 @@ struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi)
 
                cur = tb[proc_header_env[i].idx];
                vars[i].name = proc_header_env[i].name;
-               vars[i].value = cur ? blobmsg_data(cur) : "";
+               vars[i].value = cur ? blobmsg_data(cur) : NULL;
        }
 
        memcpy(&vars[i], extra_vars, sizeof(extra_vars));