Hello. It seems that functions gnulib's functions iswprint() and
wcwidth() return different results on different platforms.
Code on Fedora 28:
wchar_t c = L'😀' ;
if (iswprint(c))
printf("Printable\n");
else
printf("Not printable\n");
Output: "Printable"
Code on CentOS 7:
wchar_t c = L'😀' ;
if (iswprint(c))
printf("Printable\n");
else
printf("Not printable\n");
Output: "Not Printable"
Similar problems are encountered on also on Freebsd 11.
It seems that certain unicodes, such as zero-width characters and
emojis are considered nonprintable by iswprint() function, but unicodes
such as 稱 pass correctly. Also when these unicodes are throw at
wcwidth(), it returns incorrect width for these unicodes, but it might
be because of the fact that these unicodes are considered unprintable
(even when they are printable).
https://ci.centos.org/view/libvirt/job/libvirt-master-check/systems=libvirt-freebsd-11/1345/console
Usage of iswprint in our code:
https://libvirt.org/git/?p=libvirt.git;a=blob;f=tools/vsh-table.c;h=d441a30f093357de99516db07249f214f9c25d0d;hb=HEAD#l264
Usage of wcwidth in our code:
https://libvirt.org/git/?p=libvirt.git;a=blob;f=tools/vsh-table.c;h=d441a30f093357de99516db07249f214f9c25d0d;hb=HEAD#l274
Thanks,
Simon
