shared/printf: properly implement number precision

1 files changed, 20 insertions, 10 deletions

diff --git a/src/user/app/tests/shared/printf.c b/src/user/app/tests/shared/printf.c
index 4e5ffb8..37b9679 100644
--- a/src/user/app/tests/shared/printf.c
+++ b/src/user/app/tests/shared/printf.c
@@ -23,16 +23,26 @@ static void test_printf(void) {
 	snprintf(buf, sizeof buf, "%s%%%s", "ab", "cd");
 	test(!strcmp(buf, "ab%cd"));
 
-	snprintf(buf, sizeof buf, "%05u %05u", 1234, 56789);
-	test(!strcmp(buf, "01234 56789"));
-
-	snprintf(buf, sizeof buf, "%5d %5d", 123, 4567);
-	test(!strcmp(buf, "  123  4567"));
-	snprintf(buf, sizeof buf, "%5d %5d", -123, -4567);
-	test(!strcmp(buf, " -123 -4567"));
-
-	snprintf(buf, sizeof buf, "%u %d %x", 0, 0, 0);
-	test(!strcmp(buf, "0 0 0"));
+	snprintf(buf, sizeof buf, "%05u,%05u", 1234, 56789);
+	test(!strcmp(buf, "01234,56789"));
+
+	snprintf(buf, sizeof buf, "%5d,%5d", 123, 4567);
+	test(!strcmp(buf, "  123, 4567"));
+	snprintf(buf, sizeof buf, "%5d,%5d", -123, -4567);
+	test(!strcmp(buf, " -123,-4567"));
+
+	snprintf(buf, sizeof buf, "%u,%d,%x", 0, 0, 0);
+	test(!strcmp(buf, "0,0,0"));
+
+	/* precision */
+	snprintf(buf, sizeof buf, "%5.2u,%5.2d,%5.2x", 0, 0, 0);
+	test(!strcmp(buf, "   00,   00,   00"));
+	snprintf(buf, sizeof buf, "%5.2u,%5.2d,%5.2x", 10, -10, 0x10);
+	test(!strcmp(buf, "   10,  -10,   10"));
+	snprintf(buf, sizeof buf, "%5.3d", -1);
+	test(!strcmp(buf, " -001"));
+	snprintf(buf, sizeof buf, "%.5d", 123);
+	test(!strcmp(buf, "00123"));
 }
 
 void r_s_printf(void) {