Re: [libvirt] [PATCH] virsh: improve option handling

The documentation for vshCommandOptString claims that it returns -1 on a missing required argument, but in reality, that error message was unreachable (it was buried inside an if clause that is true only if the argument was present).  The code was so hairy that I decided a rewrite would make it easier to understand, and actually return the error values we want.  In the process, this guarantees that --option '' will either return -1 or 1, depending on whether EMPTY_OK was set, reserving 0 solely for the case of an option not present and not required. Meanwhile, our construction guarantees that all vshCmdOpt have a non-null def member, so there are some redundant checks that can be trimmed. * tools/virsh.c (vshCommandOpt): Alter signature. (vshCommandOptInt, vshCommandOptUInt, vshCommandOptUL) (vshCommandOptString, vshCommandOptLongLong) (vshCommandOptULongLong, vshCommandOptBool): Adjust all callers. --- This patch replaces the one mentioned here: https://www.redhat.com/archives/libvir-list/2011-July/msg00995.html  tools/virsh.c |  302 +++++++++++++++++++++++++++++++++++++++------------------  1 files changed, 206 insertions(+), 96 deletions(-)