tests/strings/vsnprintf.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        tests/strings/vsnprintf.cpp
   3 // Purpose:     wxVsnprintf unit test
   4 // Author:      Francesco Montorsi
   5 //              (part of this file was taken from CMP.c of TRIO package
   6 //               written by Bjorn Reese and Daniel Stenberg)
   7 // Created:     2006-04-01
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 2006 Francesco Montorsi, Bjorn Reese and Daniel Stenberg
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ----------------------------------------------------------------------------
  13 // headers
  14 // ----------------------------------------------------------------------------
  15
  16 #include "testprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #include "wx/crt.h"
  23
  24 #if wxUSE_WXVSNPRINTF
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/wx.h"
  28     #include "wx/wxchar.h"
  29 #endif // WX_PRECOMP
  30
  31
  32 // NOTE: for more info about the specification of wxVsnprintf() behaviour you can
  33 //       refer to the following page of the GNU libc manual:
  34 //             http://www.gnu.org/software/libc/manual/html_node/Formatted-Output.html
  35
  36
  37
  38 // ----------------------------------------------------------------------------
  39 // global utilities for testing
  40 // ----------------------------------------------------------------------------
  41
  42 #define MAX_TEST_LEN        1024
  43
  44 // temporary buffers
  45 static wxChar buf[MAX_TEST_LEN];
  46 int r;
  47
  48 // these macros makes it possible to write all tests without repeating a lot
  49 // of times the wxT() macro
  50 // NOTE: you should use expected strings with these macros which do not exceed
  51 //       MAX_TEST_LEN as these macro do check if the return value is == (int)wxStrlen(buf)
  52
  53 #define ASSERT_STR_EQUAL( a, b ) \
  54     CPPUNIT_ASSERT_EQUAL( wxString(a), wxString(b) );
  55
  56 #define CMP6(expected, fmt, y, z, w, t)                    \
  57     r=wxSnprintf(buf, MAX_TEST_LEN, wxT(fmt), y, z, w, t); \
  58     CPPUNIT_ASSERT_EQUAL( r, wxStrlen(buf) );          \
  59     ASSERT_STR_EQUAL( wxT(expected), buf );
  60
  61 #define CMP5(expected, fmt, y, z, w)                    \
  62     r=wxSnprintf(buf, MAX_TEST_LEN, wxT(fmt), y, z, w); \
  63     CPPUNIT_ASSERT_EQUAL( r, wxStrlen(buf) );          \
  64     ASSERT_STR_EQUAL( wxT(expected), buf );
  65
  66 #define CMP4(expected, fmt, y, z)                     \
  67     r=wxSnprintf(buf, MAX_TEST_LEN, wxT(fmt), y, z);  \
  68     CPPUNIT_ASSERT_EQUAL( r, wxStrlen(buf) );          \
  69     ASSERT_STR_EQUAL( wxT(expected), buf );
  70
  71 #define CMP3(expected, fmt, y)                        \
  72     r=wxSnprintf(buf, MAX_TEST_LEN, wxT(fmt), y);     \
  73     CPPUNIT_ASSERT_EQUAL( r, wxStrlen(buf) );          \
  74     ASSERT_STR_EQUAL( wxT(expected), buf );
  75
  76 #define CMP2(expected, fmt)                           \
  77     r=wxSnprintf(buf, MAX_TEST_LEN, wxT(fmt));        \
  78     CPPUNIT_ASSERT_EQUAL( r, wxStrlen(buf) );          \
  79     ASSERT_STR_EQUAL( wxT(expected), buf );
  80
  81 // NOTE: this macro is used also with too-small buffers (see Miscellaneous())
  82 //       test function, thus the return value can be > size and thus we
  83 //       cannot check if r == (int)wxStrlen(buf)
  84 #define CMPTOSIZE(buffer, size, failuremsg, expected, fmt, x, y, z, w)  \
  85     r=wxSnprintf(buffer, size, wxT(fmt), x, y, z, w);                   \
  86     CPPUNIT_ASSERT( r > 0 );                                            \
  87     CPPUNIT_ASSERT_EQUAL_MESSAGE(                                       \
  88         failuremsg,                                                     \
  89         wxString(wxT(expected)).Left(size - 1),                         \
  90         wxString(buffer))
  91
  92 // this is the same as wxSnprintf() but it passes the format string to
  93 // wxVsnprintf() without using WX_ATTRIBUTE_PRINTF and thus suppresses the gcc
  94 // checks (and resulting warnings) for the format string
  95 //
  96 // use with extreme care and only when you're really sure the warnings must be
  97 // suppressed!
  98 template<typename T>
  99 static int
 100 wxUnsafeSnprintf(T *buf, size_t len, const wxChar *fmt, ...)
 101 {
 102     va_list args;
 103     va_start(args, fmt);
 104
 105     int rc = wxVsnprintf(buf, len, fmt, args);
 106
 107     va_end(args);
 108
 109     return rc;
 110 }
 111
 112 // ----------------------------------------------------------------------------
 113 // test class
 114 // ----------------------------------------------------------------------------
 115
 116 class VsnprintfTestCase : public CppUnit::TestCase
 117 {
 118 public:
 119     VsnprintfTestCase() {}
 120
 121     virtual void setUp();
 122
 123 private:
 124     CPPUNIT_TEST_SUITE( VsnprintfTestCase );
 125         CPPUNIT_TEST( C );
 126         CPPUNIT_TEST( D );
 127         CPPUNIT_TEST( X );
 128         CPPUNIT_TEST( O );
 129         CPPUNIT_TEST( P );
 130         CPPUNIT_TEST( N );
 131         CPPUNIT_TEST( E );
 132         CPPUNIT_TEST( F );
 133         CPPUNIT_TEST( G );
 134         CPPUNIT_TEST( S );
 135         CPPUNIT_TEST( Asterisk );
 136         CPPUNIT_TEST( Percent );
 137 #ifdef wxLongLong_t
 138         CPPUNIT_TEST( LongLong );
 139 #endif
 140
 141         CPPUNIT_TEST( BigToSmallBuffer );
 142 #if wxUSE_WXVSNPRINTF
 143         CPPUNIT_TEST( WrongFormatStrings );
 144 #endif // wxUSE_WXVSNPRINTF
 145         CPPUNIT_TEST( Miscellaneous );
 146     CPPUNIT_TEST_SUITE_END();
 147
 148     void C();
 149     void D();
 150     void X();
 151     void O();
 152     void P();
 153     void N();
 154     void E();
 155     void F();
 156     void G();
 157     void S();
 158     void Asterisk();
 159     void Percent();
 160 #ifdef wxLongLong_t
 161     void LongLong();
 162 #endif
 163     void Unicode();
 164
 165     template<typename T>
 166         void DoBigToSmallBuffer(T *buffer, int size);
 167     void BigToSmallBuffer();
 168
 169 #if wxUSE_WXVSNPRINTF
 170     void WrongFormatStrings();
 171 #endif // wxUSE_WXVSNPRINTF
 172
 173     // compares the expectedString and the result of wxVsnprintf() char by char
 174     // for all its lenght (not only for first expectedLen chars) and also
 175     // checks the return value
 176     void DoMisc(int expectedLen, const wxString& expectedString,
 177                 size_t max, const wxChar *format, ...);
 178     void Miscellaneous();
 179
 180     DECLARE_NO_COPY_CLASS(VsnprintfTestCase)
 181 };
 182
 183 // register in the unnamed registry so that these tests are run by default
 184 CPPUNIT_TEST_SUITE_REGISTRATION( VsnprintfTestCase );
 185
 186 // also include in it's own registry so that these tests can be run alone
 187 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION( VsnprintfTestCase, "VsnprintfTestCase" );
 188
 189 void VsnprintfTestCase::setUp()
 190 {
 191     // this call is required to avoid check failures when running on machines
 192     // with a locale where the decimal point is not '.'
 193     wxSetlocale(LC_ALL, "C");
 194 }
 195
 196 void VsnprintfTestCase::C()
 197 {
 198     CMP5("hi!", "%c%c%c", wxT('h'), wxT('i'), wxT('!'));
 199
 200     // NOTE:
 201     // the NULL characters _can_ be passed to %c to e.g. create strings
 202     // with embedded NULs (because strings are not always supposed to be
 203     // NUL-terminated).
 204
 205     DoMisc(14, wxT("Hello \0 World!"), 16, wxT("Hello %c World!"), wxT('\0'));
 206 }
 207
 208 void VsnprintfTestCase::D()
 209 {
 210     CMP3("+123456", "%+d", 123456);
 211     CMP3("-123456", "%d", -123456);
 212     CMP3(" 123456", "% d", 123456);
 213     CMP3("    123456", "%10d", 123456);
 214     CMP3("0000123456", "%010d", 123456);
 215     CMP3("-123456   ", "%-10d", -123456);
 216 }
 217
 218 void VsnprintfTestCase::X()
 219 {
 220     CMP3("ABCD", "%X", 0xABCD);
 221     CMP3("0XABCD", "%#X", 0xABCD);
 222     CMP3("0xabcd", "%#x", 0xABCD);
 223 }
 224
 225 void VsnprintfTestCase::O()
 226 {
 227     CMP3("1234567", "%o", 01234567);
 228     CMP3("01234567", "%#o", 01234567);
 229 }
 230
 231 void VsnprintfTestCase::P()
 232 {
 233     // WARNING: printing of pointers is not fully standard.
 234     //          GNU prints them as %#x except for NULL pointers which are
 235     //          printed as '(nil)'.
 236     //          MSVC always print them as %8X on 32 bit systems and as %16X
 237     //          on 64 bit systems
 238     //          mingw32 uses MSVC CRT by default so uses the same rules
 239 #if defined(__VISUALC__) || (defined(__MINGW32__) && !__USE_MINGW_ANSI_STDIO)
 240     #if SIZEOF_VOID_P == 4
 241         CMP3("00ABCDEF", "%p", (void*)0xABCDEF);
 242         CMP3("00000000", "%p", (void*)NULL);
 243     #elif SIZEOF_VOID_P == 8
 244         CMP3("0000ABCDEFABCDEF", "%p", (void*)0xABCDEFABCDEF);
 245         CMP3("0000000000000000", "%p", (void*)NULL);
 246     #endif
 247 #elif defined(__MINGW32__)
 248     CMP3("0xabcdef", "%p", (void*)0xABCDEF);
 249     CMP3("0", "%p", (void*)NULL);
 250 #elif defined(__GNUG__)
 251     CMP3("0xabcdef", "%p", (void*)0xABCDEF);
 252     CMP3("(nil)", "%p", (void*)NULL);
 253 #endif
 254 }
 255
 256 void VsnprintfTestCase::N()
 257 {
 258     int nchar;
 259
 260     wxSnprintf(buf, MAX_TEST_LEN, wxT("%d %s%n\n"), 3, wxT("bears"), &nchar);
 261     CPPUNIT_ASSERT_EQUAL( 7, nchar );
 262 }
 263
 264 void VsnprintfTestCase::E()
 265 {
 266     // NB: there are no standards about the minimum exponent width
 267     //     (and the width of the %e conversion specifier refers to the
 268     //      mantissa, not to the exponent).
 269     //     Since newer MSVC versions use 3 digits as minimum exponent
 270     //     width while GNU libc uses 2 digits as minimum width, here we
 271     //     workaround this problem using for the exponent values with at
 272     //     least three digits.
 273     //     Some examples:
 274     //       printf("%e",2.342E+02);
 275     //     -> under MSVC7.1 prints:      2.342000e+002
 276     //     -> under GNU libc 2.4 prints: 2.342000e+02
 277     CMP3("2.342000e+112", "%e",2.342E+112);
 278     CMP3("-2.3420e-112", "%10.4e",-2.342E-112);
 279     CMP3("-2.3420e-112", "%11.4e",-2.342E-112);
 280     CMP3("   -2.3420e-112", "%15.4e",-2.342E-112);
 281
 282     CMP3("-0.02342", "%G",-2.342E-02);
 283     CMP3("3.1415E-116", "%G",3.1415e-116);
 284     CMP3("0003.141500e+103", "%016e", 3141.5e100);
 285     CMP3("   3.141500e+103", "%16e", 3141.5e100);
 286     CMP3("3.141500e+103   ", "%-16e", 3141.5e100);
 287     CMP3("3.142e+103", "%010.3e", 3141.5e100);
 288 }
 289
 290 void VsnprintfTestCase::F()
 291 {
 292     CMP3("3.300000", "%5f", 3.3);
 293     CMP3("3.000000", "%5f", 3.0);
 294     CMP3("0.000100", "%5f", .999999E-4);
 295     CMP3("0.000990", "%5f", .99E-3);
 296     CMP3("3333.000000", "%5f", 3333.0);
 297 }
 298
 299 void VsnprintfTestCase::G()
 300 {
 301     // NOTE: the same about E() testcase applies here...
 302
 303     CMP3("  3.3", "%5g", 3.3);
 304     CMP3("    3", "%5g", 3.0);
 305     CMP3("9.99999e-115", "%5g", .999999E-114);
 306     CMP3("0.00099", "%5g", .99E-3);
 307     CMP3(" 3333", "%5g", 3333.0);
 308     CMP3(" 0.01", "%5g", 0.01);
 309
 310     CMP3("    3", "%5.g", 3.3);
 311     CMP3("    3", "%5.g", 3.0);
 312     CMP3("1e-114", "%5.g", .999999E-114);
 313     CMP3("0.0001", "%5.g", 1.0E-4);
 314     CMP3("0.001", "%5.g", .99E-3);
 315     CMP3("3e+103", "%5.g", 3333.0E100);
 316     CMP3(" 0.01", "%5.g", 0.01);
 317
 318     CMP3("  3.3", "%5.2g", 3.3);
 319     CMP3("    3", "%5.2g", 3.0);
 320     CMP3("1e-114", "%5.2g", .999999E-114);
 321     CMP3("0.00099", "%5.2g", .99E-3);
 322     CMP3("3.3e+103", "%5.2g", 3333.0E100);
 323     CMP3(" 0.01", "%5.2g", 0.01);
 324 }
 325
 326 void VsnprintfTestCase::S()
 327 {
 328     CMP3("  abc", "%5s", wxT("abc"));
 329     CMP3("    a", "%5s", wxT("a"));
 330     CMP3("abcdefghi", "%5s", wxT("abcdefghi"));
 331     CMP3("abc  ", "%-5s", wxT("abc"));
 332     CMP3("abcdefghi", "%-5s", wxT("abcdefghi"));
 333
 334     CMP3("abcde", "%.5s", wxT("abcdefghi"));
 335
 336     // do the same tests but with Unicode characters:
 337 #if wxUSE_UNICODE
 338
 339     // Unicode code points from U+03B1 to U+03B9 are the greek letters alpha-iota;
 340     // UTF8 encoding of such code points is 0xCEB1 to 0xCEB9
 341
 342 #define ALPHA       "\xCE\xB1"
 343         // alpha
 344 #define ABC         "\xCE\xB1\xCE\xB2\xCE\xB3"
 345         // alpha+beta+gamma
 346 #define ABCDE       "\xCE\xB1\xCE\xB2\xCE\xB3\xCE\xB4\xCE\xB5"
 347         // alpha+beta+gamma+delta+epsilon
 348 #define ABCDEFGHI   "\xCE\xB1\xCE\xB2\xCE\xB3\xCE\xB4\xCE\xB5\xCE\xB6\xCE\xB7\xCE\xB8\xCE\xB9"
 349         // alpha+beta+gamma+delta+epsilon+zeta+eta+theta+iota
 350
 351     // the 'expected' and 'arg' parameters of this macro are supposed to be
 352     // UTF-8 strings
 353 #define CMP3_UTF8(expected, fmt, arg)                                         \
 354     CPPUNIT_ASSERT_EQUAL                                                      \
 355     (                                                                         \
 356         wxString::FromUTF8(expected).length(),                                \
 357         wxSnprintf(buf, MAX_TEST_LEN, fmt, wxString::FromUTF8(arg))           \
 358     );                                                                        \
 359     CPPUNIT_ASSERT_EQUAL                                                      \
 360     (                                                                         \
 361         wxString::FromUTF8(expected),                                         \
 362         buf                                                                   \
 363     )
 364
 365     CMP3_UTF8("  " ABC,     "%5s",  ABC);
 366     CMP3_UTF8("    " ALPHA, "%5s",  ALPHA);
 367     CMP3_UTF8(ABCDEFGHI,    "%5s",  ABCDEFGHI);
 368     CMP3_UTF8(ABC "  ",     "%-5s", ABC);
 369     CMP3_UTF8(ABCDEFGHI,    "%-5s", ABCDEFGHI);
 370     CMP3_UTF8(ABCDE,        "%.5s", ABCDEFGHI);
 371 #endif // wxUSE_UNICODE
 372
 373     // test a string which has a NULL character after "ab";
 374     // obviously it should be handled exactly like just as "ab"
 375     CMP3("   ab", "%5s", wxT("ab\0cdefghi"));
 376 }
 377
 378 void VsnprintfTestCase::Asterisk()
 379 {
 380     CMP5("       0.1", "%*.*f", 10, 1, 0.123);
 381     CMP5("    0.1230", "%*.*f", 10, 4, 0.123);
 382     CMP5("0.1", "%*.*f", 3, 1, 0.123);
 383
 384     CMP4("%0.002", "%%%.*f", 3, 0.0023456789);
 385
 386     CMP4("       a", "%*c", 8, 'a');
 387     CMP4("    four", "%*s", 8, "four");
 388     CMP6("    four   four", "%*s %*s", 8, "four", 6, "four");
 389 }
 390
 391 void VsnprintfTestCase::Percent()
 392 {
 393     // some tests without any argument passed through ...
 394     CMP2("%", "%%");
 395     CMP2("%%%", "%%%%%%");
 396
 397     CMP3("%  abc", "%%%5s", wxT("abc"));
 398     CMP3("%  abc%", "%%%5s%%", wxT("abc"));
 399
 400     // do not test odd number of '%' symbols as different implementations
 401     // of snprintf() give different outputs as this situation is not considered
 402     // by any standard (in fact, GCC will also warn you about a spurious % if
 403     // you write %%% as argument of some *printf function !)
 404     // Compare(wxT("%"), wxT("%%%"));
 405 }
 406
 407 #ifdef wxLongLong_t
 408 void VsnprintfTestCase::LongLong()
 409 {
 410     CMP3("123456789", "%lld", (wxLongLong_t)123456789);
 411     CMP3("-123456789", "%lld", (wxLongLong_t)-123456789);
 412
 413     CMP3("123456789", "%llu", (wxULongLong_t)123456789);
 414
 415 #ifdef __WXMSW__
 416     CMP3("123456789", "%I64d", (wxLongLong_t)123456789);
 417     CMP3("123456789abcdef", "%I64x", wxLL(0x123456789abcdef));
 418 #endif
 419 }
 420 #endif
 421
 422 // this test is only for our own implementation, the system implementation
 423 // doesn't always give errors for invalid format strings (e.g. glibc doesn't)
 424 // and as it's not required too (the behaviour is "undefined" according to the
 425 // spec), there is really no sense in testing for it
 426 #if wxUSE_WXVSNPRINTF
 427
 428 void VsnprintfTestCase::WrongFormatStrings()
 429 {
 430     // test how wxVsnprintf() behaves with wrong format string:
 431
 432 #if 0
 433     // NB: the next 2 tests currently return an error but it would be nice
 434     //     if they didn't (see ticket #9367)
 435
 436     // two positionals with the same index:
 437     r = wxSnprintf(buf, MAX_TEST_LEN, wxT("%1$s %1$s"), "hello");
 438     CPPUNIT_ASSERT(r != -1);
 439
 440     // three positionals with the same index mixed with other pos args:
 441     r = wxSnprintf(buf, MAX_TEST_LEN, wxT("%4$d %2$f %1$s %2$s %3$d"), "hello", "world", 3, 4);
 442     CPPUNIT_ASSERT(r != -1);
 443 #endif
 444
 445     // a missing positional arg: this should result in an error but not all
 446     // implementations detect it (e.g. glibc doesn't)
 447     r = wxSnprintf(buf, MAX_TEST_LEN, wxT("%1$d %3$d"), 1, 2, 3);
 448     CPPUNIT_ASSERT_EQUAL(-1, r);
 449
 450     // positional and non-positionals in the same format string:
 451     r = wxSnprintf(buf, MAX_TEST_LEN, wxT("%1$d %d %3$d"), 1, 2, 3);
 452     CPPUNIT_ASSERT_EQUAL(-1, r);
 453 }
 454
 455 #endif // wxUSE_WXVSNPRINTF
 456
 457 // BigToSmallBuffer() test case helper:
 458 template<typename T>
 459 void VsnprintfTestCase::DoBigToSmallBuffer(T *buffer, int size)
 460 {
 461     // Remember that wx*printf could be mapped either to system
 462     // implementation or to wx implementation.
 463     // In the first case, when the output buffer is too small, the returned
 464     // value can be the number of characters required for the output buffer
 465     // (conforming to ISO C99; implemented in e.g. GNU libc >= 2.1), or
 466     // just a negative number, usually -1; (this is how e.g. MSVC's
 467     // *printf() behaves). Luckily, in all implementations, when the
 468     // output buffer is too small, it's nonetheless filled up to its max size.
 469     //
 470     // Note that in the second case (i.e. when we're using our own implementation),
 471     // wxVsnprintf() will return the number of characters written in the standard
 472     // output or
 473     //   -1         if there was an error in the format string
 474     //   maxSize+1  if the output buffer is too small
 475
 476     wxString errStr;
 477     errStr << "The size of the buffer was " << size;
 478     std::string errMsg(errStr.mb_str());
 479
 480     // test without positionals
 481     CMPTOSIZE(buffer, size, errMsg,
 482               "123456789012 - test - 123 -4.567",
 483               "%i%li - test - %d %.3f",
 484               123, (long int)456789012, 123, -4.567);
 485
 486 #if wxUSE_PRINTF_POS_PARAMS
 487     // test with positional
 488     CMPTOSIZE(buffer, size, errMsg,
 489               "-4.567 123 - test - 456789012 123",
 490               "%4$.3f %1$i - test - %2$li %3$d",
 491               123, (long int)456789012, 123, -4.567);
 492 #endif
 493
 494     // test unicode/ansi conversion specifiers
 495     //
 496     // NB: we use wxUnsafeSnprintf() as %hs and %hc are invalid in printf
 497     //     format and gcc would warn about this otherwise
 498
 499     r = wxUnsafeSnprintf(buffer, size,
 500                          wxT("unicode string/char: %ls/%lc -- ansi string/char: %hs/%hc"),
 501                          L"unicode", L'U', "ansi", 'A');
 502     wxString expected =
 503         wxString(wxT("unicode string/char: unicode/U -- ansi string/char: ansi/A")).Left(size - 1);
 504
 505     CPPUNIT_ASSERT( r != -1 );
 506     CPPUNIT_ASSERT_EQUAL(
 507         expected,
 508         wxString(buffer)
 509     );
 510 }
 511
 512 void VsnprintfTestCase::BigToSmallBuffer()
 513 {
 514     // VC6 can't compile this code
 515 #if !defined(__VISUALC__) || (__VISUALC__ >= 1310)
 516 #if wxUSE_UNICODE
 517     wchar_t bufw[1024], bufw2[16], bufw3[4], bufw4;
 518     DoBigToSmallBuffer(bufw, 1024);
 519     DoBigToSmallBuffer(bufw2, 16);
 520     DoBigToSmallBuffer(bufw3, 4);
 521     DoBigToSmallBuffer(&bufw4, 1);
 522 #endif // wxUSE_UNICODE
 523
 524     char bufa[1024], bufa2[16], bufa3[4], bufa4;
 525     DoBigToSmallBuffer(bufa, 1024);
 526     DoBigToSmallBuffer(bufa2, 16);
 527     DoBigToSmallBuffer(bufa3, 4);
 528     DoBigToSmallBuffer(&bufa4, 1);
 529 #endif // !VC6
 530 }
 531
 532 // Miscellaneous() test case helper:
 533 void VsnprintfTestCase::DoMisc(
 534         int expectedLen,
 535         const wxString& expectedString,
 536         size_t max,
 537         const wxChar *format, ...)
 538 {
 539     const size_t BUFSIZE = MAX_TEST_LEN - 1;
 540     size_t i;
 541     static int count = 0;
 542
 543     wxASSERT(max <= BUFSIZE);
 544
 545     for (i = 0; i < BUFSIZE; i++)
 546         buf[i] = '*';
 547     buf[BUFSIZE] = 0;
 548
 549     va_list ap;
 550     va_start(ap, format);
 551
 552     int n = wxVsnprintf(buf, max, format, ap);
 553
 554     va_end(ap);
 555
 556     // Prepare messages so that it is possible to see from the error which
 557     // test was running.
 558     wxString errStr, overflowStr;
 559     errStr << wxT("No.: ") << ++count << wxT(", expected: ") << expectedLen
 560            << wxT(" '") << expectedString << wxT("', result: ");
 561     overflowStr << errStr << wxT("buffer overflow");
 562     errStr << n << wxT(" '") << buf << wxT("'");
 563
 564     // turn them into std::strings
 565     std::string errMsg(errStr.mb_str());
 566     std::string overflowMsg(overflowStr.mb_str());
 567
 568     CPPUNIT_ASSERT_MESSAGE(errMsg,
 569             (expectedLen == -1 && size_t(n) >= max) || expectedLen == n);
 570
 571     CPPUNIT_ASSERT_MESSAGE(errMsg, expectedString == buf);
 572
 573     for (i = max; i < BUFSIZE; i++)
 574         CPPUNIT_ASSERT_MESSAGE(overflowMsg, buf[i] == '*');
 575 }
 576
 577 void VsnprintfTestCase::Miscellaneous()
 578 {
 579     // expectedLen, expectedString, max, format, ...
 580     DoMisc(5,  wxT("-1234"),   8, wxT("%d"), -1234);
 581     DoMisc(7,  wxT("1234567"), 8, wxT("%d"), 1234567);
 582     DoMisc(-1, wxT("1234567"), 8, wxT("%d"), 12345678);
 583     DoMisc(-1, wxT("-123456"), 8, wxT("%d"), -1234567890);
 584
 585     DoMisc(6,  wxT("123456"),  8, wxT("123456"));
 586     DoMisc(7,  wxT("1234567"), 8, wxT("1234567"));
 587     DoMisc(-1, wxT("1234567"), 8, wxT("12345678"));
 588
 589     DoMisc(6,  wxT("123450"),  8, wxT("12345%d"), 0);
 590     DoMisc(7,  wxT("1234560"), 8, wxT("123456%d"), 0);
 591     DoMisc(-1, wxT("1234567"), 8, wxT("1234567%d"), 0);
 592     DoMisc(-1, wxT("1234567"), 8, wxT("12345678%d"), 0);
 593
 594     DoMisc(6,  wxT("12%45%"),  8, wxT("12%%45%%"));
 595     DoMisc(7,  wxT("12%45%7"), 8, wxT("12%%45%%7"));
 596     DoMisc(-1, wxT("12%45%7"), 8, wxT("12%%45%%78"));
 597
 598     DoMisc(5,  wxT("%%%%%"),   6, wxT("%%%%%%%%%%"));
 599     DoMisc(6,  wxT("%%%%12"),  7, wxT("%%%%%%%%%d"), 12);
 600 }
 601
 602 #endif // wxUSE_WXVSNPRINTF