checkin of static-buffer-vs-talloc-snprintf

Context: https://gerrit.osmocom.org/c/osmo-hnbgw/+/33169

snprintf-static-vs-talloc/reproducer.c

@@ -0,0 +1,58 @@
+#include <osmocom/core/utils.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/talloc.h>
+
+
+/* context: https://gerrit.osmocom.org/c/osmo-hnbgw/+/33169 */
+
+#define USE_SELECT
+
+static struct osmo_timer_list exit_timer;
+static unsigned int print_count;
+
+const char *print_static(void)
+{
+	static __thread char buf[40];
+	snprintf(buf, sizeof(buf), "%u-%u-L%u-R%u-S%u", 901, 70, 23, 40, 1);
+	return buf;
+}
+
+const char *print_talloc(void)
+{
+	return talloc_asprintf(OTC_SELECT, "%u-%u-L%u-R%u-S%u", 901, 70, 23, 40, 1);
+}
+
+static void do_prints(unsigned int count)
+{
+	for (unsigned int i = 0; i < count; i++) {
+#ifdef USE_SELECT
+		print_talloc();
+#else
+		print_static();
+#endif
+		print_count++;
+	}
+}
+
+static void timer_cb(void *data)
+{
+	printf("printed %u iterations\n", print_count);
+	exit(0);
+}
+
+int main(int argc, char **argv)
+{
+
+	osmo_timer_setup(&exit_timer, timer_cb, NULL);
+	osmo_timer_schedule(&exit_timer, 1, 0);
+
+	while (true) {
+		do_prints(5);
+#ifdef USE_SELECT
+		osmo_select_main_ctx(true);
+#else
+		osmo_select_main(true);
+#endif
+	}
+}