add osmo_bcd2str()
Add a standalone bcd-to-string conversion function with generic parameters.
Add a regression test in utils_test.c.
So far there is no single universal implementation that converts a BCD to a
string. I could only find gsm48_mi_to_string(), which also interprets
surrounding bytes, MI type and TMSI as non-BCD value.
The idea is to use this function from gsm48_mi_to_string() and similar
implementations in subsequent commits.
Root cause: in osmo-msc, I want to have an alternative MI-to-string function
for composing an FSM name, which needs the BCD part of gsm48_mi_to_string() but
not the TMSI part.
Change-Id: I86b09d37ceef33331c1a56046a5443127d6c6be0
diff --git a/tests/utils/utils_test.c b/tests/utils/utils_test.c
index 2bb1f9c..a773b3f 100644
--- a/tests/utils/utils_test.c
+++ b/tests/utils/utils_test.c
@@ -32,6 +32,7 @@
#include <time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <errno.h>
static void hexdump_test(void)
{
@@ -383,6 +384,118 @@
}
}
+struct bcd2str_test {
+ const char *bcd_hex;
+ int start_nibble;
+ int end_nibble;
+ bool allow_hex;
+ size_t str_size;
+ const char *expect_str;
+ int expect_rc;
+};
+
+static const struct bcd2str_test bcd2str_tests[] = {
+ {
+ .bcd_hex = "1a 32 54 76 98 f0",
+ .start_nibble = 1,
+ .end_nibble = 11,
+ .expect_str = "1234567890",
+ .expect_rc = 10,
+ },
+ {
+ .bcd_hex = "1a 32 a4 cb 9d f0",
+ .start_nibble = 1,
+ .end_nibble = 11,
+ .expect_str = "1234ABCD90",
+ .expect_rc = -EINVAL,
+ },
+ {
+ .bcd_hex = "1a 32 a4 cb 9d f0",
+ .start_nibble = 1,
+ .end_nibble = 11,
+ .allow_hex = true,
+ .expect_str = "1234ABCD90",
+ .expect_rc = 10,
+ },
+ {
+ .bcd_hex = "1a 32 54 76 98 f0",
+ .start_nibble = 1,
+ .end_nibble = 12,
+ .expect_str = "1234567890F",
+ .expect_rc = -EINVAL,
+ },
+ {
+ .bcd_hex = "1a 32 54 76 98 f0",
+ .start_nibble = 1,
+ .end_nibble = 12,
+ .allow_hex = true,
+ .expect_str = "1234567890F",
+ .expect_rc = 11,
+ },
+ {
+ .bcd_hex = "1a 32 54 76 98 f0",
+ .start_nibble = 0,
+ .end_nibble = 12,
+ .allow_hex = true,
+ .expect_str = "A1234567890F",
+ .expect_rc = 12,
+ },
+ {
+ .bcd_hex = "1a 32 54 76 98 f0",
+ .start_nibble = 1,
+ .end_nibble = 12,
+ .str_size = 5,
+ .expect_str = "1234",
+ .expect_rc = 11,
+ },
+ {
+ .bcd_hex = "",
+ .start_nibble = 1,
+ .end_nibble = 1,
+ .expect_str = "",
+ .expect_rc = 0,
+ },
+};
+
+static void bcd2str_test(void)
+{
+ int i;
+ uint8_t bcd[64];
+ int rc;
+
+ printf("\nTesting bcd to string conversion\n");
+
+ for (i = 0; i < ARRAY_SIZE(bcd2str_tests); i++) {
+ const struct bcd2str_test *t = &bcd2str_tests[i];
+ char str[64] = {};
+ size_t str_size = t->str_size ? : sizeof(str);
+
+ osmo_hexparse(t->bcd_hex, bcd, sizeof(bcd));
+
+ printf("- BCD-input='%s' nibbles=[%d..%d[ str_size=%zu\n", t->bcd_hex,
+ t->start_nibble, t->end_nibble, str_size);
+ rc = osmo_bcd2str(str, str_size, bcd, t->start_nibble, t->end_nibble, t->allow_hex);
+
+ printf(" rc=%d\n", rc);
+
+ OSMO_ASSERT(str[str_size-1] == '\0');
+ printf(" -> %s\n", osmo_quote_str(str, -1));
+
+ if (rc != t->expect_rc)
+ printf(" ERROR: expected rc=%d\n", t->expect_rc);
+ if (strcmp(str, t->expect_str))
+ printf(" ERROR: expected result %s\n", osmo_quote_str(t->expect_str, -1));
+ }
+
+ printf("- zero output buffer\n");
+ rc = osmo_bcd2str(NULL, 100, bcd, 1, 2, false);
+ printf(" bcd2str(NULL, ...) -> %d\n", rc);
+ OSMO_ASSERT(rc < 0);
+ rc = osmo_bcd2str((char*)23, 0, bcd, 1, 2, false);
+ printf(" bcd2str(dst, 0, ...) -> %d\n", rc);
+ OSMO_ASSERT(rc < 0);
+}
+
static void str_escape_test(void)
{
int i;
@@ -810,6 +923,7 @@
test_ipa_ccm_id_resp_parsing();
test_is_hexstr();
bcd_test();
+ bcd2str_test();
str_escape_test();
str_quote_test();
isqrt_test();