Add unit tests for bcd2char and char2bcd conversion

Sounds stupid, but we actually didn't support hex nibbles in one of
the two directions of the conversion, so let's make sure we test for
this.

Change-Id: I8445da54cc4f9b1cd64f286c2b238f4f7c87accb

2 files changed, 61 insertions, 0 deletions

diff --git a/tests/utils/utils_test.c b/tests/utils/utils_test.c
index 4a4b121f..e6d7ae8c 100644
--- a/tests/utils/utils_test.c
+++ b/tests/utils/utils_test.c
@@ -26,6 +26,7 @@
 #include <osmocom/core/utils.h>
 
 #include <stdio.h>
+#include <ctype.h>
 
 static void hexdump_test(void)
 {
@@ -281,6 +282,47 @@ bool test_is_hexstr()
 	return pass;
 }
 
+struct bcdcheck {
+	uint8_t bcd;
+	char ch;
+};
+
+static const struct bcdcheck bcdchecks[]  = {
+	{ 0, '0' },
+	{ 1, '1' },
+	{ 2, '2' },
+	{ 3, '3' },
+	{ 4, '4' },
+	{ 5, '5' },
+	{ 6, '6' },
+	{ 7, '7' },
+	{ 8, '8' },
+	{ 9, '9' },
+	{ 0xA, 'A' },
+	{ 0xB, 'B' },
+	{ 0xC, 'C' },
+	{ 0xD, 'D' },
+	{ 0xE, 'E' },
+	{ 0xF, 'F' },
+};
+
+static void bcd_test(void)
+{
+	int i;
+
+	printf("\nTesting BCD conversion\n");
+	for (i = 0; i < ARRAY_SIZE(bcdchecks); i++) {
+		const struct bcdcheck *check = &bcdchecks[i];
+		char ch = osmo_bcd2char(check->bcd);
+		printf("\tval=0x%x, expected=%c, found=%c\n", check->bcd, check->ch, ch);
+		OSMO_ASSERT(osmo_bcd2char(check->bcd) == check->ch);
+		/* test char -> bcd back-coversion */
+		OSMO_ASSERT(osmo_char2bcd(ch) == check->bcd);
+		/* test for lowercase hex char */
+		OSMO_ASSERT(osmo_char2bcd(tolower(ch)) == check->bcd);
+	}
+}
+
 int main(int argc, char **argv)
 {
 	static const struct log_info log_info = {};
@@ -290,5 +332,6 @@ int main(int argc, char **argv)
 	hexparse_test();
 	test_idtag_parsing();
 	test_is_hexstr();
+	bcd_test();
 	return 0;
 }
diff --git a/tests/utils/utils_test.ok b/tests/utils/utils_test.ok
index 45156f7f..33a185bf 100644
--- a/tests/utils/utils_test.ok
+++ b/tests/utils/utils_test.ok
@@ -57,3 +57,21 @@ rc = -1
 26: pass str='BeadedBeeAced1EbbedDefacedFacade' min=32 max=32 even=1 expect=valid
 27: pass str='C01ffedC1cadaeAc1d1f1edAcac1aB0a' min=32 max=32 even=0 expect=valid
 28: pass str='DeafBeddedBabeAcceededFadedDecaff' min=32 max=32 even=0 expect=invalid
+
+Testing BCD conversion
+	val=0x0, expected=0, found=0
+	val=0x1, expected=1, found=1
+	val=0x2, expected=2, found=2
+	val=0x3, expected=3, found=3
+	val=0x4, expected=4, found=4
+	val=0x5, expected=5, found=5
+	val=0x6, expected=6, found=6
+	val=0x7, expected=7, found=7
+	val=0x8, expected=8, found=8
+	val=0x9, expected=9, found=9
+	val=0xa, expected=A, found=A
+	val=0xb, expected=B, found=B
+	val=0xc, expected=C, found=C
+	val=0xd, expected=D, found=D
+	val=0xe, expected=E, found=E
+	val=0xf, expected=F, found=F