Hi, I found a bug in the cal command. It is a segmentation fault for the following input. cal -d 20210516 Segmentation fault: 11 The segmentation fault happens with exactly 8 digits. However, there is something going wrong with more digits as well. With 9 or more digits, the command's output gets weird. I checked the bug in three systems (Debian 10, OS X, and Ubuntu Server 16.04). Linux NAME 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5+deb10u2 (2019-08-08) x86_64 GNU/Linux Darwin NAME 19.6.0 Darwin Kernel Version 19.6.0: Tue Jan 12 22:13:05 PST 2021; root:xnu-6153.141.16~1/RELEASE_X86_64 x86_64 Linux NAME 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12 21:23:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Unfortunately, I don't have the time to go through the code and provide a detailed fix for the issue. However, I assume it should be fairly straightforward for the maintainers to find and fix this bug. Best regards, Diego
