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The output for %#x is almost the same as that for %p, both output in hexadecimal with a leading "0x". However for zero %#x should just output "0" (the same as decimal and ocal). For %p match glibc and output "(nil)" rather than "0x0" or "0". Add tests for "%#x", "% d", "%+d" and passing NULL to "%p". Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-14-david.laight.linux@gmail.com [Thomas: fix up testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>