0.14.1: --chat: fix use of username without domain

One to one chats with a username without a domain would echo back
messages. Use the domain from the user's JID:

```
xmppipe -u user1@example.com --chat user2
```

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2015-2016, Michael Santos <michael.santos@gmail.com>
+Copyright (c) 2015-2022, Michael Santos <michael.santos@gmail.com>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted, provided that the above

src/xmppipe.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2020, Michael Santos <michael.santos@gmail.com>
+/* Copyright (c) 2015-2022, Michael Santos <michael.santos@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -237,7 +237,7 @@ int main(int argc, char **argv) {
     state->out = xmppipe_strdup(state->room);
     state->mucjid = xmppipe_mucjid(state->out, state->resource);
   } else if (!(state->opt & XMPPIPE_OPT_GROUPCHAT)) {
-    state->out = xmppipe_strdup(jid);
+    state->out = xmppipe_chatjid(state->room, state->server);
   }
 
   if (xmppipe_fmt_init() < 0)

src/xmppipe.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2019, Michael Santos <michael.santos@gmail.com>
+/* Copyright (c) 2015-2022, Michael Santos <michael.santos@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -27,7 +27,7 @@
 #include "strtonum.h"
 #endif
 
-#define XMPPIPE_VERSION "0.14.0"
+#define XMPPIPE_VERSION "0.14.1"
 #define XMPPIPE_RESOURCE "xmppipe"
 
 #define XMPPIPE_STREQ(a, b) (strcmp((a), (b)) == 0)
@@ -141,6 +141,7 @@ char *xmppipe_servername(char *);
 char *xmppipe_roomname(char *);
 char *xmppipe_conference(char *, char *);
 char *xmppipe_mucjid(char *, char *);
+char *xmppipe_chatjid(char *, char *);
 
 void xmppipe_next_state(xmppipe_state_t *state, int status);
 void xmppipe_stream_close(xmppipe_state_t *);

src/xmppipe_util.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2019, Michael Santos <michael.santos@gmail.com>
+/* Copyright (c) 2015-2022, Michael Santos <michael.santos@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -234,6 +234,15 @@ char *xmppipe_mucjid(char *muc, char *resource) {
   return buf;
 }
 
+char *xmppipe_chatjid(char *jid, char *servername) {
+  size_t len = strlen(jid) + 1 + strlen(servername) + 1;
+  char *buf = xmppipe_malloc(len);
+
+  (void)snprintf(buf, len, "%s@%s", jid, servername);
+
+  return buf;
+}
+
 char *xmppipe_roomname(char *label) {
   char *buf = NULL;
   size_t len = 64;