Compare all percentage fields with compareRealNumbers()

The SPACESHIP_NUMBER() macro does not work well with floating point
values that are possible to be NaNs. Change the compare logic of all
percentage fields of Process entries to use compareRealNumbers().

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

1 files changed, 5 insertions, 0 deletions

diff --git a/XUtils.h b/XUtils.h
index 68e370b0..fd1087d5 100644
--- a/XUtils.h
+++ b/XUtils.h
@@ -82,6 +82,11 @@ ssize_t xReadfileat(openat_arg_t dirfd, const char* pathname, void* buffer, size
 ATTR_ACCESS3_R(2, 3)
 ssize_t full_write(int fd, const void* buf, size_t count);
 
+/* Compares floating point values for ordering data entries. In this function,
+   NaN is considered "less than" any other floating point value (regardless of
+   sign), and two NaNs are considered "equal" regardless of payload. */
+int compareRealNumbers(double a, double b);
+
 /* Computes the sum of all positive floating point values in an array.
    NaN values in the array are skipped. The returned sum will always be
    nonnegative. */