[LTP] [PATCH v4 09/12] Add TST_EXP_EQ_STRN macro

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

New TST_EXP_EQ_STRN macro can be used to compare two strings, passing
their length if needed.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 include/tst_test_macros.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/include/tst_test_macros.h b/include/tst_test_macros.h
index b1508f8bb189ac680a7cf943dae3d1b307295b4e..3d6245f607c453d879a9b71b77f3c8f524a92238 100644
--- a/include/tst_test_macros.h
+++ b/include/tst_test_macros.h
@@ -455,4 +455,35 @@ const char *tst_errno_names(char *buf, const int *exp_errs, int exp_errs_cnt);
 	}                                                                      \
 } while (0)
 
+/**
+ * TST_EXP_EQ_STRN() - Compare two strings, providing length as well.
+ *
+ * @STR_A: string to compare.
+ * @STR_B: string to compare.
+ * @LEN: length of the string.
+ */
+#define TST_EXP_EQ_STRN(STR_A, STR_B, LEN) do {                                \
+	char str_a_cpy[LEN+1];                                                 \
+									       \
+	strncpy(str_a_cpy, STR_A, LEN);                                        \
+	str_a_cpy[LEN] = 0;                                                    \
+									       \
+	TST_PASS = strncmp(STR_A, STR_B, LEN) == 0;                            \
+									       \
+	if (TST_PASS) {                                                        \
+		tst_res_(__FILE__, __LINE__, TPASS,                            \
+			"%s == %s (%s)",                                       \
+			#STR_A, #STR_B, str_a_cpy);                            \
+	} else {                                                               \
+		char str_b_cpy[LEN+1];                                         \
+									       \
+		strncpy(str_b_cpy, STR_B, LEN);                                \
+		str_b_cpy[LEN] = 0;                                            \
+									       \
+		tst_res_(__FILE__, __LINE__, TFAIL,                            \
+			"%s (%s) != %s (%s)",                                  \
+			#STR_A, str_a_cpy, #STR_B, str_b_cpy);                 \
+	}                                                                      \
+} while (0)
+
 #endif	/* TST_TEST_MACROS_H__ */

-- 
2.43.0