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The configure script relied on bash-specific extensions to shell syntax
and behavior, causing build failures on systems with other /bin/sh
implementations. This commit replaces those with equivalent constructs
that should work in all POSIX shells.

Fixes #695.

glibc 2.28 no longer defines 'major' and 'minor' in <sys/types.h> and
requires us to include <sys/sysmacros.h>. (glibc 2.25 starts
deprecating the macros in <sys/types.h>.) Now do include the latter if
found on the system.

At the moment, let's also utilize AC_HEADER_MAJOR in configure script.
However as Autoconf 2.69 has not yet updated the AC_HEADER_MAJOR macro
to reflect the glibc change [1], so add a workaround code.

Fixes #663. Supersedes pull request #729.

Reference:
[1] https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commit;h=e17a30e987d7ee695fb4294a82d987ec3dc9b974

Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

Avoid unnecessary access() call and make code read more linearly.

Require at least the `fields` entry to be present,
so we can have a decent guess that it was indeed a settings file.

I was occasionally passing negative values to size_t.
Plus, this better reflects the intent of the variant argument.

Reported by Coverity:
https://scan8.coverity.com/reports.htm#v13253/p10402/fileInstanceId=22093891&defectInstanceId=7543346&mergedDefectId=174179&fileStart=251&fileEnd=500

Detected by Coverity:
https://scan8.coverity.com/reports.htm#v13252/p10402/fileInstanceId=22093957&defectInstanceId=7543348&mergedDefectId=174180

Detected by Coverity:
https://scan8.coverity.com/reports.htm#v13252/p10402/fileInstanceId=22093847&defectInstanceId=7543344&mergedDefectId=174181

The "if" tests if the character at index "5" is 'r', as a first quick
check. However at index "5" will always be a colon ":". This patch fixes
the off-by-one error. htop now shows proper values in the RD_SYSC
column.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Fixes #738.

Fixes #733.

It seems that certain negative integer values can crash isalnum().
Let's protect against those.

Fixes #711.

Fixes #710.

Fixes #635.

Not for a comparison to zero

*hightlight*

Fixes #688, the bug regressed on 584a9bce.

On Mac OS X 10.11.6, all processes have their parents since there's a
special process named "kernel_task", whose PID and PPID are 0. As a
result, `this->processes` is never changed causing infinite `while`.

Linux commit 06eb61844d841d0032a9950ce7f8e783ee49c0d0 ("sched/debug:
Add explicit TASK_IDLE printing") exposes kthreads idling using
TASK_IDLE in procfs as "I (idle)".

Until now, when sorting the STATE ("S") column, htop used the raw
value of the state character for comparison, however that led to the
undesirable effect of TASK_IDLE ('I') tasks being sorted above tasks
that were running ('R').

Thus, explicitly recognize the idle process state, and sort it below
others.