tree fe958a285adaee54e1931e2cd6d013b628971df1
parent b3f4f51ea68a495f8a5956064c33dce711a2df91
author Willy Tarreau <w@1wt.eu> 1666332220 +0200
committer Paul E. McKenney <paulmck@kernel.org> 1666995442 -0700

selftests/nolibc: Add 7 tests for memcmp()

This adds 7 combinations of input values for memcmp() using signed and
unsigned bytes, which will trigger on the original code before Rasmus'
fix. This is mostly aimed at helping backporters verify their work, and
showing how tests for corner cases can be added to the selftests suite.

Before the fix it reports:
  12 memcmp_20_20 = 0                      [OK]
  13 memcmp_20_60 = -64                    [OK]
  14 memcmp_60_20 = 64                     [OK]
  15 memcmp_20_e0 = 64                    [FAIL]
  16 memcmp_e0_20 = -64                   [FAIL]
  17 memcmp_80_e0 = -96                    [OK]
  18 memcmp_e0_80 = 96                     [OK]

And after:
  12 memcmp_20_20 = 0                      [OK]
  13 memcmp_20_60 = -64                    [OK]
  14 memcmp_60_20 = 64                     [OK]
  15 memcmp_20_e0 = -192                   [OK]
  16 memcmp_e0_20 = 192                    [OK]
  17 memcmp_80_e0 = -96                    [OK]
  18 memcmp_e0_80 = 96                     [OK]

Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>