From: Michal Privoznik <mprivozn@redhat.com>

The aim of cmdDomIfAddr() is to obtain IP addresses for given
domain and then print (ifName, MAC, type, IP Address) tuple.
Preferably in an aligned table. This is hard to do with printf
style of spacing ("%-NNs") since the interface name (ifName) can
vary a lot in length. Fortunately, we have vshTable which is
designed to handle this case.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
---
 tools/virsh-domain-monitor.c | 53 ++++++++++++++++++++----------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/tools/virsh-domain-monitor.c b/tools/virsh-domain-monitor.c
index f4274f2721..c0db30cb11 100644
--- a/tools/virsh-domain-monitor.c
+++ b/tools/virsh-domain-monitor.c
@@ -2279,6 +2279,7 @@ cmdDomIfAddr(vshControl *ctl, const vshCmd *cmd)
     bool full = vshCommandOptBool(cmd, "full");
     const char *sourcestr = NULL;
     int source = VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE;
+    g_autoptr(vshTable) table = NULL;
 
     if (vshCommandOptString(ctl, cmd, "interface", &ifacestr) < 0)
         return false;
@@ -2299,28 +2300,30 @@ cmdDomIfAddr(vshControl *ctl, const vshCmd *cmd)
         goto cleanup;
     }
 
-    vshPrintExtra(ctl, " %-10s %-20s %-8s     %s\n%s%s\n", _("Name"),
-                  _("MAC address"), _("Protocol"), _("Address"),
-                  _("-------------------------------------------------"),
-                  _("------------------------------"));
+    table = vshTableNew(_("Name"), _("MAC address"), _("Protocol"), _("Address"), NULL);
+    if (!table)
+        return false;
 
     for (i = 0; i < ifaces_count; i++) {
         virDomainInterfacePtr iface = ifaces[i];
         const char *type = NULL;
+        const char *hwaddr = "N/A";
 
         if (ifacestr && STRNEQ(ifacestr, iface->name))
             continue;
 
+        if (iface->hwaddr)
+            hwaddr = iface->hwaddr;
+
         /* When the interface has no IP address */
         if (!iface->naddrs) {
-            vshPrint(ctl, " %-10s %-17s    %-12s %s\n",
-                     iface->name,
-                     iface->hwaddr ? iface->hwaddr : "N/A", "N/A", "N/A");
+            if (vshTableRowAppend(table,
+                                  iface->name, hwaddr, "N/A", "N/A", NULL) < 0)
+                goto cleanup;
             continue;
         }
 
         for (j = 0; j < iface->naddrs; j++) {
-            g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
             g_autofree char *ip_addr_str = NULL;
 
             switch (iface->addrs[j].type) {
@@ -2332,26 +2335,30 @@ cmdDomIfAddr(vshControl *ctl, const vshCmd *cmd)
                 break;
             }
 
-            virBufferAsprintf(&buf, "%-12s %s/%d",
-                              type, iface->addrs[j].addr,
-                              iface->addrs[j].prefix);
-
-            ip_addr_str = virBufferContentAndReset(&buf);
-
-            if (!ip_addr_str)
-                ip_addr_str = g_strdup("");
+            ip_addr_str = g_strdup_printf("%s/%d",
+                                          iface->addrs[j].addr,
+                                          iface->addrs[j].prefix);
 
             /* Don't repeat interface name */
-            if (full || !j)
-                vshPrint(ctl, " %-10s %-17s    %s\n",
-                         iface->name,
-                         NULLSTR_EMPTY(iface->hwaddr), ip_addr_str);
-            else
-                vshPrint(ctl, " %-10s %-17s    %s\n",
-                         "-", "-", ip_addr_str);
+            if (full || !j) {
+                if (vshTableRowAppend(table,
+                                      iface->name,
+                                      NULLSTR_EMPTY(iface->hwaddr),
+                                      NULLSTR_MINUS(type), ip_addr_str, NULL) < 0) {
+                    goto cleanup;
+                }
+            } else {
+                if (vshTableRowAppend(table,
+                                      "-", "-",
+                                      NULLSTR_MINUS(type), ip_addr_str, NULL) < 0) {
+                    goto cleanup;
+                }
+            }
         }
     }
 
+    vshTablePrintToStdout(table, ctl);
+
     ret = true;
 
  cleanup:
-- 
2.52.0