I think the explicit termination (buf[] = '\0') is not needed. Personaly
I would prefer memset() to clean up the buffer. strncopy() reduced by
two instead of a single chars protects the last string terminator. But
we will not die when it not was changed

[src/tools/show.c]
==> endpoint() <==
122,123c122
-               strncpy(buf, gai_strerror(ret), sizeof(buf) - 1);
-               buf[sizeof(buf) - 1] = '\0';
---
+               strncpy(buf, gai_strerror(ret), sizeof(buf) - 2);
162a162
+       memset(buf, 0, sizeof(buf));
164c164
-               strncpy(buf, "Now", sizeof(buf) - 1);
---
+               strncpy(buf, "Now", sizeof(buf) - 2);

==> ago() <==
166c166
-               strncpy(buf, "(" TERMINAL_FG_RED "System clock wound backward;
connection problems may ensue." TERMINAL_RESET ")", sizeof(buf) - 1);
---
+               strncpy(buf, "(" TERMINAL_FG_RED "System clock wound backward;
connection problems may ensue." TERMINAL_RESET ")", sizeof(buf) - 2);
169c169
-               strncpy(buf + offset, " ago", sizeof(buf) - offset - 1);
---
-               strncpy(buf + offset, " ago", sizeof(buf) - offset - 2);
171d170
-       buf[sizeof(buf) - 1] = '\0';

-- 
Best regards,
Markus

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