Removed a loop that sets the bar[] buffer with spaces and merged that
task to the snprintf() call just below. No need for the barOffset
variable. Display behavior is unchanged.
Size comparision (when compiled on Ubuntu 14.04 64-bit):
$ size htop.old htop.new
text data bss dec hex filename
137312 15112 3776 156200 26228 htop.old
137216 15112 3776 156104 261c8 htop.new
Just assume Platform_meterTypes[0] is always &CPUMeter_class for every
platform. This removes a conditional in AvailableMetersPanel_new().
Also adds some comments about the logic here. Without assuming
Platform_meterTypes[0], the (int i=1) clause in this for loop will not
make sense. (I.e. Why not (int i=0)? )
Also replaced a sprintf() call with safer snprintf() in code further
below.
Two changes in this commit:
- All meters now explicitly specify "maxItems" property, even for just
1 item. (Exception is "container" CPU meter classes, which use
CUSTOM_METERMODE.)
- "maxItems" being 0 is now allowed. This will let bar meters and graph
meters render an empty meter.
calloc() allows 'nmemb' or 'size' to be zero, in which case NULL may be
returned. Letting htop die because of either argument being zero doesn't
make sense.
As a side note: As size_t is unsigned, compiler should be able to optimize
conditional (nmemb > 0 && size > 0) to (nmemb && size). This theorically
shouldn't increase code size too much.
Namely:
o use malloc where an xCalloc slipped in
o safeguard against an empty arg list - I don't think it's possible,
but it would be potentially exploitable
o we need to initialize the arg string to an empty string because we no
longer use strlcpy(3)
o annotate a tricky use of strlcpy(3)'s truncation
Including:
o set *basenameEnd even in error cases (FreeBSD probably needs this)
o use kvm_openfiles(3) rather than kvm_open(3) so that we can report
errors (as with FreeBSD)
o sanify the process argument list creation by using strlcat(3)
o drop the pageSizeKb variable and use the PAGE_SIZE_KB macro directly,
as the page size can't change anyway
o clean up a few macros, add MINIMUM() and MAXIMUM() (should be
mirrored to FreeBSD)
o fix some syntax
o add some useful comments
This involves switching from kvm_open(3) to kvm_openfiles(3). The only
difference is that the latter has saner error reporting (see the man
page for details). We can now fatally report the error rather than just
calling assert(3).
Once a process goes zombie on Linux, /proc/PID/cmdline
gets empty. So, when we detect it is a zombie we stop
reading this file.
For processes that were zombies before htop started,
there's no way to get the full name.
Closes#49.
Hisham Muhammad