if (!isdigit(* (unsigned char *) p)) {

so that the argument is always in the range of unsigned char when
coerced to an int.

(See digit 1.)

the client should exit upon receiving one and not be surprised that
the socket closes.

the client should exit upon receiving one and not be surprised that
the socket closes.

must be an int, not a char.  This could cause sign-extension problems.

Correction from Nelson Beebe: argument to functions such as isspace()
must be an int, not a char.  This could cause sign-extension problems.

must be an int, not a char.  This could cause sign-extension problems.

Try symlinks with an empty target

Show io phase name in error message.

use div/mod.

transferred".

I don't generally like changing that sort of thing, but I think this
one was a persistent source of confusion.

most frequently-used ones in here.

Nelson Beebe pointed out that the information about bug tracking was
out of date.

CPU on a local transfer, without achieving anything useful.