xap_helper: support term length limit

This will allow us to use p2q-compatible specifications such as
"dfpost7" to only capture blob OIDs which are 7 characters in
length (the indexer will always index down to 7 characters)

1 files changed, 10 insertions, 1 deletions

diff --git a/lib/PublicInbox/xap_helper.h b/lib/PublicInbox/xap_helper.h
index 1f8c426b..3456910b 100644
--- a/lib/PublicInbox/xap_helper.h
+++ b/lib/PublicInbox/xap_helper.h
@@ -123,6 +123,7 @@ typedef bool (*cmd)(struct req *);
 struct req { // argv and pfxv point into global rbuf
         char *argv[MY_ARG_MAX];
         char *pfxv[MY_ARG_MAX]; // -A <prefix>
+        size_t *lenv; // -A <prefix>LENGTH
         struct srch *srch;
         char *Pgit_dir;
         char *Oeidx_key;
@@ -727,6 +728,13 @@ static void sigw(int sig) // SIGTERM handler for worker
         sock_fd = -1; // break out of recv_loop
 }
 
+#define CLEANUP_REQ __attribute__((__cleanup__(req_cleanup)))
+static void req_cleanup(void *ptr)
+{
+        struct req *req = (struct req *)ptr;
+        free(req->lenv);
+}
+
 static void recv_loop(void) // worker process loop
 {
         static char rbuf[4096 * 33]; // per-process
@@ -737,7 +745,8 @@ static void recv_loop(void) // worker process loop
 
         while (sock_fd == 0) {
                 size_t len = sizeof(rbuf);
-                struct req req = {};
+                CLEANUP_REQ struct req req = {};
+
                 if (!recv_req(&req, rbuf, &len))
                         continue;
                 if (req.fp[1])