tests: Tests for the locale independent sr_vsnprintf_ascii() function.

diff --git a/tests/strutil.c b/tests/strutil.c
index aded4142bf16f135afcfc08b0a32788fd2e7b7ac..0138fa9dffcfa2a9712d0cddf1653b39c51d06b1 100644 (file)
--- a/tests/strutil.c
+++ b/tests/strutil.c
@@ -19,9 +19,50 @@
 
 #include <config.h>
 #include <check.h>
+#include <locale.h>
 #include <libsigrok/libsigrok.h>
 #include "lib.h"
 
+#if 0
+static void test_vsnprintf(const char *expected, char *format, ...)
+{
+       va_list args;
+       char *s;
+       int len;
+
+       len = 16;
+       s = g_malloc0(len + 1);
+
+       va_start(args, format);
+       len = vsnprintf(s, len, format, args);
+       va_end(args);
+
+       fail_unless(s != NULL, "len = %i, s = s", len);
+       fail_unless(!strcmp(s, expected),
+                   "Invalid result for '%s': %s.", expected, s);
+       g_free(s);
+}
+#endif
+
+static void test_sr_vsnprintf_ascii(const char *expected, char *format, ...)
+{
+       va_list args;
+       char *s;
+       int len;
+
+       len = 16;
+       s = g_malloc0(len + 1);
+
+       va_start(args, format);
+       len = sr_vsnprintf_ascii(s, len, format, args);
+       va_end(args);
+
+       fail_unless(s != NULL, "len = %i, s = s", len);
+       fail_unless(!strcmp(s, expected),
+                       "Invalid result for '%s': %s.", expected, s);
+       g_free(s);
+}
+
 static void test_samplerate(uint64_t samplerate, const char *expected)
 {
        char *s;
@@ -67,6 +108,61 @@ static void test_voltage(uint64_t v_p, uint64_t v_q, const char *expected)
        g_free(s);
 }
 
+START_TEST(test_locale)
+{
+       char *old_locale, *saved_locale;
+
+       /* Get the the current locale. */
+       old_locale = setlocale(LC_NUMERIC, NULL);
+       fprintf(stderr, "Old locale = %s\n", old_locale);
+       /* Copy the name so it won’t be clobbered by setlocale. */
+       saved_locale = g_strdup(old_locale);
+       ck_assert_msg(saved_locale != NULL);
+
+#ifdef _WIN32
+       /*
+        * See: https://msdn.microsoft.com/en-us/library/cc233982.aspx
+        * Doesn't work! Locale is not set!
+        */
+       setlocale(LC_NUMERIC, "de-DE");
+#else
+       /*
+        * For all *nix and OSX systems, change the locale for all threads to
+        * one that is known for not working correctly with printf(), e.g.
+        * "de_DE.UTF-8".
+        *
+        * Find all your available system locales with "locale -a".
+        */
+       setlocale(LC_NUMERIC, "de_DE.UTF-8");
+#endif
+       fprintf(stderr, "New locale = %s\n", setlocale(LC_NUMERIC, NULL));
+
+       test_sr_vsnprintf_ascii("0.1", "%.1f", (double)0.1);
+       test_sr_vsnprintf_ascii("0.12", "%.2f", (double)0.12);
+       test_sr_vsnprintf_ascii("0.123", "%.3f", (double)0.123);
+       test_sr_vsnprintf_ascii("0.1234", "%.4f", (double)0.1234);
+       test_sr_vsnprintf_ascii("0.12345", "%.5f", (double)0.12345);
+       test_sr_vsnprintf_ascii("0.123456", "%.6f", (double)0.123456);
+
+#if 0
+       /*
+        * These tests can be used to tell on which platforms the printf()
+        * functions are locale-dependent (i.e. these tests will fail).
+        */
+       test_vsnprintf("0.1", "%.1f", (double)0.1);
+       test_vsnprintf("0.12", "%.2f", (double)0.12);
+       test_vsnprintf("0.123", "%.3f", (double)0.123);
+       test_vsnprintf("0.1234", "%.4f", (double)0.1234);
+       test_vsnprintf("0.12345", "%.5f", (double)0.12345);
+       test_vsnprintf("0.123456", "%.6f", (double)0.123456);
+#endif
+
+       /* Restore the original locale. */
+       setlocale(LC_NUMERIC, saved_locale);
+       g_free(saved_locale);
+}
+END_TEST
+
 /*
  * Check various inputs for sr_samplerate_string():
  *
@@ -292,6 +388,7 @@ Suite *suite_strutil(void)
 
        tc = tcase_create("sr_samplerate_string");
        tcase_add_checked_fixture(tc, srtest_setup, srtest_teardown);
+       tcase_add_test(tc, test_locale);
        tcase_add_test(tc, test_hz);
        tcase_add_test(tc, test_khz);
        tcase_add_test(tc, test_mhz);