`-m` was added as short option for `--no-mouse`, this is inconsistence
to the rest of the cli since otherwise the short options to disable a
feature are capital letters. Therefore this commit renames the option to
`-M`.

This commit also documents the option in the man page.

v is generally used for enabling verbose mode

Compatible with gcc and clang.

Use internal macros for compatibility with non GNUC compilers.

int foo(); declares a function taking any number of arguments.

These feature macros are either define or not defined at all at the
configure step.

Fixes #163

They are nowhere used.

This also fixes an issue with time returned negative if sysconf(_SC_CLK_TCK) returned an error.

unsigned integer overflows are well-defined, but they might point to a counting issue.
Having the code free of unsigned overflows makes it easier to spot potential bugs.

  Action.c:332:27: runtime error: implicit conversion from type 'int' of value -1 (32-bit, signed) to type 'uid_t' (aka 'unsigned int') changed the value to 4294967295 (32-bit, unsigned)
  SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior Action.c:332:27 in

For a process with a very long command, especially with many long
command line arguments, inspecting the command and its arguments could
become inconvenient.

Meanwhile htop supports the concept of "screen", or window, which is
extended here to create a dedicated "CommandScreen", making it possible
to display the command of the selected process in a separate window
meanwhile being wrapped into multiple lines.

Another benefit of using a command screen is, the user can navigate
through the wrapped lines of the command and perform actions like
searching and filtering.

They can not be supported both at the same time.
Fail configure step instead of silently only use hwloc.

commsize is bounded by the allocated length passed in by commLen, saved
into commLenIn

We just want a non-NUll pointer in the matching pid hashtable.
The pointer is not dereferenced anyways.

Use the more portable sysfs node /sys/devices/system/cpu/cpuX/cpufreq/scaling_cur_freq
to get the CPU frequency.
In case of an error fall back to /proc/cpuinfo .

Also use a fixed width of 4 for the frequency to avoid position jumps
in case the frequency moves in the range 900-1100 MHz.

linux/Battery.c:291:6: warning: no previous prototype for function 'Battery_getData' [-Wmissing-prototypes]
void Battery_getData(double* level, ACPresence* isOnAC) {
     ^

linux/Platform.c:142:17: warning: cast from function call of type 'double' to non-matching type 'int' [-Wbad-function-cast]
   return (int) floor(uptime);
                ^~~~~~~~~~~~~

htop.c:112:13: warning: 'break' will never be executed [-Wunreachable-code-break]
            break;
            ^~~~~
htop.c:109:13: warning: 'break' will never be executed [-Wunreachable-code-break]
            break;
            ^~~~~

ListItem.c:73:33: warning: cast from 'const void *' to 'struct ListItem_ *' drops const qualifier [-Wcast-qual]
   ListItem* obj1 = (ListItem*) cast1;
                                ^
ListItem.c:74:33: warning: cast from 'const void *' to 'struct ListItem_ *' drops const qualifier [-Wcast-qual]
   ListItem* obj2 = (ListItem*) cast2;
                                ^

Process.c:434:28: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
   Process* p1 = (Process*)v1;
                           ^
Process.c:435:28: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
   Process* p2 = (Process*)v2;
                           ^
Process.c:441:36: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
   Settings *settings = ((Process*)v1)->settings;
                                   ^
Process.c:443:22: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
      p1 = (Process*)v1;
                     ^
Process.c:444:22: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
      p2 = (Process*)v2;
                     ^
Process.c:446:22: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
      p2 = (Process*)v1;
                     ^
Process.c:447:22: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
      p1 = (Process*)v2;
                     ^

AffinityPanel.c:37:16: warning: cast from 'const char *' to 'void *' drops const qualifier [-Wcast-qual]
   free((void*)this->text);
               ^
AffinityPanel.c:39:19: warning: cast from 'const char *' to 'void *' drops const qualifier [-Wcast-qual]
      free((void*)this->indent);
                  ^

linux/LinuxProcess.c:294:36: warning: cast from 'const void *' to 'struct Process_ *' drops const qualifier [-Wcast-qual]
   Settings *settings = ((Process*)v1)->settings;
                                   ^
linux/LinuxProcess.c:296:27: warning: cast from 'const void *' to 'struct LinuxProcess_ *' drops const qualifier [-Wcast-qual]
      p1 = (LinuxProcess*)v1;
                          ^
linux/LinuxProcess.c:297:27: warning: cast from 'const void *' to 'struct LinuxProcess_ *' drops const qualifier [-Wcast-qual]
      p2 = (LinuxProcess*)v2;
                          ^
linux/LinuxProcess.c:299:27: warning: cast from 'const void *' to 'struct LinuxProcess_ *' drops const qualifier [-Wcast-qual]
      p2 = (LinuxProcess*)v1;
                          ^
linux/LinuxProcess.c:300:27: warning: cast from 'const void *' to 'struct LinuxProcess_ *' drops const qualifier [-Wcast-qual]
      p1 = (LinuxProcess*)v2;
                          ^

linux/LinuxProcessList.c:62:32: warning: cast from 'const void *' to 'struct TtyDriver_ *' drops const qualifier [-Wcast-qual]
   TtyDriver* a = (TtyDriver*) va;
                               ^
linux/LinuxProcessList.c:63:32: warning: cast from 'const void *' to 'struct TtyDriver_ *' drops const qualifier [-Wcast-qual]
   TtyDriver* b = (TtyDriver*) vb;
                               ^

linux/Battery.c:130:21: warning: cast from 'const char *' to 'char *' drops const qualifier [-Wcast-qual]
      free((char *) isOnline);
                    ^
linux/Battery.c:197:26: warning: cast from 'const char *' to 'char *' drops const qualifier [-Wcast-qual]
      xSnprintf((char *) filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/type", entryName);
                         ^
linux/Battery.c:209:29: warning: cast from 'const char *' to 'char *' drops const qualifier [-Wcast-qual]
         xSnprintf((char *) filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/uevent", entryName);
                            ^
linux/Battery.c:262:29: warning: cast from 'const char *' to 'char *' drops const qualifier [-Wcast-qual]
         xSnprintf((char *) filePath, sizeof filePath, SYS_POWERSUPPLY_DIR "/%s/online", entryName);
                            ^

This commit is based on a patch originally by @edef1c. The ZFS ARC is a cache
(it's in the name), which will be evicted by the kernel if memory pressure so
requires. Hence, the ARC should not be counted towards a system's total used
memory, and should instead be grouped with the other caches in the system.

Signed-off-by: edef <[email protected]>

…into multiplexd-arc-is-not-cache

Add -Wmissing-prototypes compiler warning

Add Valgrind script

Make --enable-hwloc and --enable-linux-affinity mutual exclusive

Instead of scanning the meter name to determine the number of columns in a
CPU meter, move the common code behind some wrapper functions, and specify the
number of columns as an explicit parameter when called from the wrappers.

While this does add a bit of code for all the necessary wrapper functions, this
should be less brittle in case of future changes to the CPU meter code.

This is a straightforward extension of the existing multi-column CPU meter
code, which now allows for up CPU meters to be displayed in up to 16 columns.

This also adds the meter declarations to all the platform-specific code.

- `CRT_fatalError()` is declared twice in CRT.h
- `Process_pidFormat`, `Process_writeField()` and `Process_compare` are
  declared twice in Process.h
- `btime` is defined in LinuxProcess.c and also declared in
  LinuxProcess.h, so drop in LinuxProcessList.h

This issue was previously hidden as xSnprintf expanded to only one large command that didn't trigger the GCC formatting check.

When building on a 32-bit system, the compiler warned that the
following line uses a constant whose value is the overflow result
of a compile-time computation:

  Process.c (line 109):   } else if (number < 10000 * ONE_M) {

Namely, this constant expression:

  10000 * ONE_M

was intended to produce the following value:

  10485760000

However, the result overflowed to produce:

   1895825408

The reason for this overflow is as follows:

  o The macros are expanded:

      10000 * (ONE_K * ONE_K)
      10000 * (1024L * 1024L)

  o The untyped constant expression "10000" is typed:

      10000U * (1024L * 1024L)

  o The parenthesized expression is evaluated:

      10000U * (1048576L)

  o The left operand ("10000U") is converted:

      10000L * (1048576L)

    Unbound by integer sizes, that last multiplication
    would produce the following value:

      10485760000

    However, on a 32-bit machine, where a long is 32 bits
    (really 31 bits when talking about positive numbers),
    the maximum value that can be computed is 2**31-1:

      2147483647

    Consequently, the computation overflows.

  o The compiler produces a long int value that is the
    the result of overflow (10485760000 % 2**31):

      1895825408L

    Actually, I think this overflow is implementation-defined,
    so it's not even a portable description of what happens.

The solution is to use a long long int (or, even better,
an unsigned long long int) type for the constant expression;
the C standard mandates a sufficiently large maximum value
for such types.

Hence, the following change is made to the bad line:

  -   } else if (number < 10000 * ONE_M) {
  +   } else if (number < 10000ULL * ONE_M) {

However, the whole line is now patently silly, because the
variable "number" is typed "unsigned long", and so it will
always be less than the constant expression (the compiler
will warn about this, too).

Hence, "number" must be typed "unsigned long long"; however,
this necessitates changing all of the string formats from
something like "%lu" to something like "%llu".

Et voila! This commit is born.

Then, for the sake of completeness, the declared types of the
constant-expression macros are updated:

  o ONE_K is made unsigned (a "UL" instead of "L")
  o ONE_T is computed by introducing "1ULL *"
  o Similar changes are made for ONE_DECIMAL_{K,T}

Also, a non-portable overflow-conversion to a signed value
has been replaced with a portable comparison:

  -   if ((long long) number == -1LL) {
  +   if (number == ULLONG_MAX) {

It might be worth reviewing the rest of the code for other
cases where overflows are not handled correctly; even at
runtime, it's often necessary to check for overflow unless
such behavior is expected (especially for signed integer
values, for which overflow has implementation-defined
behavior).

Added a basic screenshot of htop in action to the readme so that
visitors to the page can quickly get a rough idea about what htop does.

- do not reverse CPU steal and guest in monochrome
- black on black in Light Terminal is not visible, use blue on black
- white on blue in Light Terminal is display as blue on black, use
  yellow on black
- re-draw FunctionBar after color change

asserts are still disabled by default.

Use NDEBUG conditional instead of DEBUG.

Do not call static functions in extern inline ones.
    Vector.c:67:11: error: static function 'Vector_isConsistent' is used in an inline function with external linkage [-Werror,-Wstatic-in-inline]

…BE-attr-nonnull

Introduce ARRAYSIZE

…into mfwitten-0000/int-sizes/00

Applies screen title truncating to all InfoScreen classes.

Add a date meter and sort header and source files in Makefile

Change the lists of header and source files sorted alphabetical and one
file per line. This way diffs become better readable and merges easier.

Found by compiling with LTO:

    ColumnsPanel.c: In function ‘ColumnsPanel_eventHandler’:
    ColumnsPanel.c:46:59: error: potential null pointer dereference [-Werror=null-dereference]
       46 |             ((ListItem*)Panel_getSelected(super))->moving = this->moving;
          |                                                           ^
    AvailableColumnsPanel.c: In function ‘AvailableColumnsPanel_eventHandler’:
    AvailableColumnsPanel.c:31:8: error: potential null pointer dereference [-Werror=null-dereference]
       31 |    int key = ((ListItem*) Panel_getSelected(super))->key;
          |        ^
    AvailableMetersPanel.c: In function ‘AvailableMetersPanel_eventHandler’:
    AvailableMetersPanel.c:40:24: error: potential null pointer dereference [-Werror=null-dereference]
       40 |    int param = selected->key & 0xff;
          |                        ^
    linux/IOPriorityPanel.c: In function ‘IOPriorityPanel_getIOPriority’:
    linux/IOPriorityPanel.c:37:11: error: potential null pointer dereference [-Werror=null-dereference]
       37 |    return (IOPriority) ( ((ListItem*) Panel_getSelected(this))->key );
          |           ^

Closes #219

…ast release

Doing a quick check with callgrind this gives
an average reduction from 1804 cycles/call
down to 491 cycles/call on my test system.

The average was taken over about 40k calls.

This is basically the same change like in Vector_take,
just in the opposite direction.

Fixes #55
Fixes #192