utils: add osmo_strnchr()
When finding a char in a string, I want to be able to limit the search area by
size, not only by nul terminator.
Change-Id: I48f8ace9f51f8a06796648883afcabe3b4e8b537
diff --git a/tests/utils/utils_test.c b/tests/utils/utils_test.c
index 69510af..a79b8ed 100644
--- a/tests/utils/utils_test.c
+++ b/tests/utils/utils_test.c
@@ -1191,6 +1191,39 @@
}
}
+static void osmo_strnchr_test(void)
+{
+ struct test {
+ const char *haystack;
+ size_t haystack_len;
+ const char *needle;
+ int expect_offset;
+ };
+ struct test tests[] = {
+ { "foo=bar", 8, "=", 3 },
+ { "foo=bar", 4, "=", 3 },
+ { "foo=bar", 3, "=", -1 },
+ { "foo=bar", 0, "=", -1 },
+ { "foo\0=bar", 9, "=", -1 },
+ { "foo\0=bar", 9, "\0", 3 },
+ };
+ struct test *t;
+ printf("\n%s()\n", __func__);
+ for (t = tests; t - tests < ARRAY_SIZE(tests); t++) {
+ const char *r = osmo_strnchr(t->haystack, t->haystack_len, t->needle[0]);
+ int offset = -1;
+ if (r)
+ offset = r - t->haystack;
+ printf("osmo_strnchr(%s, %zu, ",
+ osmo_quote_str(t->haystack, -1), t->haystack_len);
+ printf("'%s') -> %d",
+ osmo_escape_str(t->needle, 1), offset);
+ if (offset != t->expect_offset)
+ printf(" ERROR expected %d", t->expect_offset);
+ printf("\n");
+ }
+}
+
int main(int argc, char **argv)
{
static const struct log_info log_info = {};
@@ -1213,5 +1246,6 @@
startswith_test();
name_c_impl_test();
osmo_print_n_test();
+ osmo_strnchr_test();
return 0;
}