Without further ado, the following was found: Issue: Why is "Undefined Behaviour" capitalized? "Use of the numeric conversion specifiers produces Undefined Behavior for " "invalid input. See E<.UR https://port70.net/\\:%7Ensz/\\:c/\\:c11/\\:n1570." "html\\:#7.21.6.2p10> C11 7.21.6.2/10 E<.UE .> This is a bug in the ISO C " "standard, and not an inherent design issue with the API. However, current " "implementations are not safe from that bug, so it is not recommended to use " "them. Instead, programs should use functions such as B<strtol>(3) to parse " "numeric input. Alternatively, mitigate it by specifying a maximum field " "width."