lib: Add tests for simple_itoa()

Add test and a comment for this function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Artem Lapkin <email2tema@gmail.com>

2 files changed, 29 insertions, 1 deletions

diff --git a/include/vsprintf.h b/include/vsprintf.h
index 83d187e53d..4479df0af3 100644
--- a/include/vsprintf.h
+++ b/include/vsprintf.h
@@ -172,7 +172,18 @@ int sprintf(char *buf, const char *fmt, ...)
  * See the vsprintf() documentation for format string extensions over C99.
  */
 int vsprintf(char *buf, const char *fmt, va_list args);
-char *simple_itoa(ulong i);
+
+/**
+ * simple_itoa() - convert an unsigned integer to a string
+ *
+ * This returns a static string containing the decimal representation of the
+ * given value. The returned value may be overwritten by other calls to the
+ * same function, so should be used immediately
+ *
+ * @val: Value to convert
+ * @return string containing the decimal representation of @val
+ */
+char *simple_itoa(ulong val);
 
 /**
  * Format a string and place it in a buffer
diff --git a/test/print_ut.c b/test/print_ut.c
index 11d8580e55..4fbb15b6d3 100644
--- a/test/print_ut.c
+++ b/test/print_ut.c
@@ -10,6 +10,7 @@
 #include <log.h>
 #include <mapmem.h>
 #include <version_string.h>
+#include <vsprintf.h>
 #include <test/suites.h>
 #include <test/test.h>
 #include <test/ut.h>
@@ -328,6 +329,22 @@ static int print_do_hex_dump(struct unit_test_state *uts)
 }
 PRINT_TEST(print_do_hex_dump, UT_TESTF_CONSOLE_REC);
 
+static int print_itoa(struct unit_test_state *uts)
+{
+	ut_asserteq_str("123", simple_itoa(123));
+	ut_asserteq_str("0", simple_itoa(0));
+	ut_asserteq_str("2147483647", simple_itoa(0x7fffffff));
+	ut_asserteq_str("4294967295", simple_itoa(0xffffffff));
+	if (sizeof(ulong) == 8) {
+		ut_asserteq_str("9223372036854775807",
+				simple_itoa((1UL << 63) - 1));
+		ut_asserteq_str("18446744073709551615", simple_itoa(-1));
+	}
+
+	return 0;
+}
+PRINT_TEST(print_itoa, 0);
+
 int do_ut_print(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct unit_test *tests = UNIT_TEST_SUITE_START(print_test);