From 34a6dd8d543915c91be0eb411a068d622908bd11 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno.rehling@gmail.com>
Date: Sat, 22 Oct 2016 22:35:10 +0200
Subject: [PATCH] fix crash in 997: re-introduce cfindhash. this prevents
 duplicate curse.no values.

---
 src/kernel/curse.c | 9 +++++++++
 src/kernel/curse.h | 1 +
 src/kernel/unit.c  | 1 +
 3 files changed, 11 insertions(+)

diff --git a/src/kernel/curse.c b/src/kernel/curse.c
index 612127182..d545bfd71 100644
--- a/src/kernel/curse.c
+++ b/src/kernel/curse.c
@@ -98,6 +98,15 @@ static void cunhash(curse * c)
     }
 }
 
+curse *cfindhash(int i)
+{
+    curse *old;
+
+    for (old = cursehash[i % MAXENTITYHASH]; old; old = old->nexthash)
+        if (old->no == i)
+            return old;
+    return NULL;
+}
 /* ------------------------------------------------------------- */
 /* at_curse */
 void curse_init(attrib * a)
diff --git a/src/kernel/curse.h b/src/kernel/curse.h
index c78e43405..534a936e3 100644
--- a/src/kernel/curse.h
+++ b/src/kernel/curse.h
@@ -285,6 +285,7 @@ extern "C" {
     void ct_register(const curse_type *);
     void ct_checknames(void);
 
+    curse *cfindhash(int i);
     curse *findcurse(int curseid);
 
     void curse_init(struct attrib *a);
diff --git a/src/kernel/unit.c b/src/kernel/unit.c
index a95dbe4cb..455c789ac 100644
--- a/src/kernel/unit.c
+++ b/src/kernel/unit.c
@@ -1876,6 +1876,7 @@ int newunitid(void)
     start_random_no = random_unit_no;
 
     while (ufindhash(random_unit_no) || dfindhash(random_unit_no)
+        || cfindhash(random_unit_no)
         || forbiddenid(random_unit_no)) {
         random_unit_no++;
         if (random_unit_no == MAX_UNIT_NR + 1) {