src/lib/libc/stdio/xprintf_errno.c, branch stable/8 FreeBSD source tree Make the %V{is} extension handle a NULL pointer like %s does: output "(null)" 2006-01-25T12:45:24+00:00 Poul-Henning Kamp phk@FreeBSD.org 2006-01-25T12:45:24+00:00 6dbacee284ac789077c3f2a181437ff5a7ebb3b8 Add %M{essage} extension which prints an errno value as the corresponding string if possible or numerically otherwise. It is not currently possible to do the syslog(3) like %m extension because errno would need to get capatured on entry to the first function in the printf family, so %M requires you to supply errno as an argument. Add %Q{uote} extension which will print a string in double quotes with appropriate back-slash escapes (only) if necessary. 
Add %M{essage} extension which prints an errno value as the
corresponding string if possible or numerically otherwise.

It is not currently possible to do the syslog(3) like %m extension
because errno would need to get capatured on entry to the first
function in the printf family, so %M requires you to supply errno
as an argument.

Add %Q{uote} extension which will print a string in double quotes with
appropriate back-slash escapes (only) if necessary.