Peter Eisentraut <peter.eisentr...@enterprisedb.com> writes: > On 14.07.21 18:26, Tom Lane wrote: >> https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.c#n593 >> case 's': >> a = arg.p ? arg.p : "(null)";
> Similar here: > https://github.com/ensc/dietlibc/blob/master/lib/__v_printf.c#L188 I also took a look at μClibc, as well as glibc itself, and learned some additional facts. glibc's behavior is not just 'print "(null)" instead'. It is 'print "(null)" if the field width allows at least six characters, otherwise print nothing'. μClibc is bug-compatible with this, but other implementations seem to generally just substitute "(null)" for the input string and run with that. I'm inclined to side with the latter camp. I'd rather see something like "(nu" than empty because the latter looks too much like it might be correct output; so I think glibc is expending extra code to produce a less-good result. > I think unless we get counterexamples, this is all good. Barring objections, I'll press ahead with changing snprintf.c to do this. regards, tom lane
