Re: [Qemu-block] [Qemu-devel] ping: [PATCH v13] block/raw-posix.c: Make physical devices usable in QEMU under Mac OS X host

[Eric Blake]

On 02/02/2016 06:15 PM, Programmingkid wrote:

>> No, keep filename as a const char * pointer.  It's easy to avoid use of
>> uninitialized memory.  Try this:
>>
>> const char *filename;
>> char bsd_path[MAXPATHLEN] = "";
>> ...
>> if (strncmp("/dev/cdrom"...) {
>>    bsd_path = ...
>> }
>> ...
>> if (strncmp("/dev/"...) {
>>    print_unmounting_directions(*bsd_path ? bsd_path : filename);
> 
> At first I thought this code looked unusual, but it does work. Is this ok?
> 
> #if defined(__APPLE__) && defined(__MACH__)
>         /* if a physical device experienced an error while being opened */
>         if (strncmp((*bsd_path ? bsd_path : filename), "/dev/", 5) == 0) {
>             print_unmounting_directions(*bsd_path ? bsd_path : filename);
>             return -1;
>         }

A bit repetitive. You don't use filename after the fact, so shorter
would be:

#if defined(__APPLE__)...
    if (*bsd_path) {
        filename = filename;
    if (strncmp(filename, "/dev/"...) {
        print...(filename);

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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