Add function to move a host to the end of the list

Allows to put a host in the hosts structure at the end
of the host list without reset the iterator.

CHANGELOG.md

@@ -8,7 +8,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 - Use dedicated port list for alive detection (Boreas only) if supplied via OSP. [#391](https://github.com/greenbone/gvm-libs/pull/391)
-- Allow to re allocate the finish flag in the host queue for alive tests. [#407](https://github.com/greenbone/gvm-libs/pull/407)
+- Allow to re allocate the finish flag in the host queue for alive tests.
+  [#407](https://github.com/greenbone/gvm-libs/pull/407)
+  [#410](https://github.com/greenbone/gvm-libs/pull/410)
 
 ### Added
 - Add multiple severities for nvti [#317](https://github.com/greenbone/gvm-libs/pull/317)

base/hosts.c

@@ -1300,6 +1300,37 @@ gvm_hosts_next (gvm_hosts_t *hosts)
   return hosts->hosts[hosts->current++];
 }
 
+/**
+ * @brief Gets the curren gvm_host_t from a gvm_hosts_t structure and
+ * move it to the last position in the list. The next host occupies the
+ * the current position.
+ *
+ * @param[in/out]   hosts     gvm_hosts_t structure which hosts must be
+ * rearange.
+ *
+ * @return Pointer to the new current host. NULL if error.
+ */
+gvm_host_t *
+gvm_hosts_move_host_forward (gvm_hosts_t *hosts)
+{
+  void *host_tmp;
+  size_t i;
+
+  /* If it is the last host, there is nothing to rearange and
+   * returns the same host.*/
+  if (!hosts || hosts->current == hosts->count)
+    return hosts->hosts[hosts->current - 1];
+
+  host_tmp = hosts->hosts[hosts->current - 1];
+
+  for (i = hosts->current; i < hosts->count; i++)
+    hosts->hosts[i - 1] = hosts->hosts[i];
+
+  hosts->hosts[hosts->count - 1] = host_tmp;
+
+  return hosts->hosts[hosts->current - 1];
+}
+
 /**
  * @brief Frees memory occupied by an gvm_hosts_t structure.
  *

base/hosts.h

@@ -111,6 +111,9 @@ gvm_hosts_new_with_max (const gchar *, unsigned int);
 gvm_host_t *
 gvm_hosts_next (gvm_hosts_t *);
 
+gvm_host_t *
+gvm_hosts_move_host_forward (gvm_hosts_t *);
+
 void
 gvm_hosts_free (gvm_hosts_t *);