tests/unit/test_sprintf.c: Test SNPRINTF()

Signed-off-by: Alejandro Colomar <alx@kernel.org>

diff --git a/tests/unit/Makefile.am b/tests/unit/Makefile.am
index 7416a1ded6de92a87b22740b916d2dc76cb2c0bc..03240010b6b72cfc4feeb8991ef7fc8c064819fd 100644 (file)
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@@ -5,6 +5,7 @@ TESTS = $(check_PROGRAMS)
 
 check_PROGRAMS = \
     test_chkname \
+    test_sprintf \
     test_strncpy \
     test_strtcpy \
     test_xasprintf
@@ -47,6 +48,19 @@ test_logind_LDADD = \
     $(LIBSYSTEMD) \
     $(NULL)
 
+test_sprintf_SOURCES = \
+    ../../lib/string/sprintf.c \
+    test_sprintf.c \
+    $(NULL)
+test_sprintf_CFLAGS = \
+    $(AM_FLAGS) \
+    $(NULL)
+test_sprintf_LDFLAGS = \
+    $(NULL)
+test_sprintf_LDADD = \
+    $(CMOCKA_LIBS) \
+    $(NULL)
+
 test_strncpy_SOURCES = \
     test_strncpy.c \
     $(NULL)

diff --git a/tests/unit/test_sprintf.c b/tests/unit/test_sprintf.c
new file mode 100644 (file)
index 0000000..bedcff6
--- /dev/null
+++ b/tests/unit/test_sprintf.c
@@ -0,0 +1,66 @@
+// SPDX-FileCopyrightText: 2023, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include <config.h>
+
+#include <stdio.h>
+#include <string.h>
+
+#include <stdarg.h>  // Required by <cmocka.h>
+#include <stddef.h>  // Required by <cmocka.h>
+#include <setjmp.h>  // Required by <cmocka.h>
+#include <stdint.h>  // Required by <cmocka.h>
+#include <cmocka.h>
+
+#include "sizeof.h"
+#include "string/sprintf.h"
+
+
+static void test_SNPRINTF_trunc(void **state);
+static void test_SNPRINTF_ok(void **state);
+
+
+int
+main(void)
+{
+    const struct CMUnitTest  tests[] = {
+        cmocka_unit_test(test_SNPRINTF_trunc),
+        cmocka_unit_test(test_SNPRINTF_ok),
+    };
+
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}
+
+
+static void
+test_SNPRINTF_trunc(void **state)
+{
+       char  buf[NITEMS("foo")];
+
+       // Test that we're not returning SIZE_MAX
+       assert_true(SNPRINTF(buf, "f%su", "oo") < 0);
+       assert_true(strcmp(buf, "foo") == 0);
+
+       assert_true(SNPRINTF(buf, "barbaz") == -1);
+       assert_true(strcmp(buf, "bar") == 0);
+}
+
+
+static void
+test_SNPRINTF_ok(void **state)
+{
+       char  buf[NITEMS("foo")];
+
+       assert_true(SNPRINTF(buf, "%s", "foo") == strlen("foo"));
+       assert_true(strcmp(buf, "foo") == 0);
+
+       assert_true(SNPRINTF(buf, "%do", 1) == strlen("1o"));
+       assert_true(strcmp(buf, "1o") == 0);
+
+       assert_true(SNPRINTF(buf, "f") == strlen("f"));
+       assert_true(strcmp(buf, "f") == 0);
+
+       assert_true(SNPRINTF(buf, "") == strlen(""));
+       assert_true(strcmp(buf, "") == 0);
+}