stdio-common/tst-vfprintf-mbs-prec.c

   1 /* Test for wchar_t/multi-byte conversion and precision in vfprintf.
   2    Copyright (C) 2017-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <locale.h>
  20 #include <stdbool.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <support/check.h>
  25 #include <support/test-driver.h>
  26 #include <wchar.h>
  27
  28 #define DYNARRAY_STRUCT str
  29 #define DYNARRAY_ELEMENT char
  30 #define DYNARRAY_PREFIX str_
  31 #include <malloc/dynarray-skeleton.c>
  32
  33 #define DYNARRAY_STRUCT wstr
  34 #define DYNARRAY_ELEMENT wchar_t
  35 #define DYNARRAY_PREFIX wstr_
  36 #include <malloc/dynarray-skeleton.c>
  37
  38 #define DYNARRAY_STRUCT len
  39 #define DYNARRAY_ELEMENT size_t
  40 #define DYNARRAY_PREFIX len_
  41 #include <malloc/dynarray-skeleton.c>
  42
  43 /* This should be larger than the internal buffer in vfprintf.  The
  44    constant needs to be kept in sync with the format strings in
  45    test_mbs_long and test_wide_long.  */
  46 enum { WIDE_STRING_LENGTH = 1000 };
  47
  48 /* Creates two large, random strings used for truncation testing.
  49    After the call, *MBS will be encoded in UTF-8, and *WIDE will
  50    contain the same string in the internal UCS-32 encoding.  Both
  51    strings are null-terminated.  The array *LENGTH counts the number
  52    of multi-byte characters for each prefix string of *WIDE: The first
  53    N wide characters of *WIDE correspond the first (*LENGTH)[N] bytes
  54    of *MBS.  The caller should deallocate all three arrays using
  55    free.  */
  56 static void
  57 make_random_string (char **mbs, wchar_t **wide, size_t **length)
  58 {
  59   struct str str;
  60   str_init (&str);
  61   struct wstr wstr;
  62   wstr_init (&wstr);
  63   struct len len;
  64   len_init (&len);
  65
  66   for (int i = 0; i < WIDE_STRING_LENGTH; ++i)
  67     {
  68       len_add (&len, str_size (&str));
  69       /* Cover some multi-byte UTF-8 sequences.  Avoid the null
  70          character.  */
  71       uint32_t ch = 1 + (rand () % 521);
  72       wstr_add (&wstr, ch);
  73
  74       /* Limited UTF-8 conversion.  */
  75       if (ch <= 127)
  76         str_add (&str, ch);
  77       else
  78         {
  79           /* We only implement two-byte sequences.  */
  80           uint32_t first = ch >> 6;
  81           TEST_VERIFY (first < 32);
  82           str_add (&str, 0xC0 | first);
  83           str_add (&str, 0x80 | (ch & 0x3f));
  84         }
  85     }
  86   len_add (&len, str_size (&str));
  87   wstr_add (&wstr, L'\0');
  88   str_add (&str, '\0');
  89
  90   *mbs = str_finalize (&str, NULL);
  91   TEST_VERIFY_EXIT (*mbs != NULL);
  92   *wide = wstr_finalize (&wstr, NULL);
  93   TEST_VERIFY_EXIT (*wide != NULL);
  94   *length = len_finalize (&len, NULL);
  95   TEST_VERIFY_EXIT (*length != NULL);
  96 }
  97
  98 /* snprintf tests (multi-byte result).  */
  99 static void
 100 test_mbs_result (void)
 101 {
 102   char buf[200];
 103
 104   /* ASCII wide string.  */
 105   memset (buf, '@', sizeof (buf));
 106   TEST_VERIFY (snprintf (buf, sizeof (buf), "%ls", L"xyz") == 3);
 107   TEST_VERIFY (strcmp (buf, "xyz") == 0);
 108
 109   /* Unicode wide string.  */
 110   memset (buf, '@', sizeof (buf));
 111   TEST_VERIFY (snprintf (buf, sizeof (buf), "%ls", L"x\u00DFz") == 4);
 112   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 113
 114   /* Varying precisions.  */
 115   memset (buf, '@', sizeof (buf));
 116   TEST_VERIFY (snprintf (buf, sizeof (buf), "%.1ls", L"x\u00DFz") == 1);
 117   TEST_VERIFY (strcmp (buf, "x") == 0);
 118   memset (buf, '@', sizeof (buf));
 119   TEST_VERIFY (snprintf (buf, sizeof (buf), "%.2ls", L"x\u00DFz") == 1);
 120   TEST_VERIFY (strcmp (buf, "x") == 0);
 121   memset (buf, '@', sizeof (buf));
 122   TEST_VERIFY (snprintf (buf, sizeof (buf), "%.3ls", L"x\u00DFz") == 3);
 123   TEST_VERIFY (strcmp (buf, "x\xC3\x9F") == 0);
 124   memset (buf, '@', sizeof (buf));
 125   TEST_VERIFY (snprintf (buf, sizeof (buf), "%.4ls", L"x\u00DFz") == 4);
 126   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 127   memset (buf, '@', sizeof (buf));
 128   TEST_VERIFY (snprintf (buf, sizeof (buf), "%.5ls", L"x\u00DFz") == 4);
 129   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 130
 131   /* Varying precisions with width 2, right-justified.  */
 132   memset (buf, '@', sizeof (buf));
 133   TEST_VERIFY (snprintf (buf, sizeof (buf), "%2.1ls", L"x\u00DFz") == 2);
 134   TEST_VERIFY (strcmp (buf, " x") == 0);
 135   memset (buf, '@', sizeof (buf));
 136   TEST_VERIFY (snprintf (buf, sizeof (buf), "%2.2ls", L"x\u00DFz") == 2);
 137   TEST_VERIFY (strcmp (buf, " x") == 0);
 138   memset (buf, '@', sizeof (buf));
 139   TEST_VERIFY (snprintf (buf, sizeof (buf), "%2.3ls", L"x\u00DFz") == 3);
 140   TEST_VERIFY (strcmp (buf, "x\xC3\x9F") == 0);
 141   memset (buf, '@', sizeof (buf));
 142   TEST_VERIFY (snprintf (buf, sizeof (buf), "%2.4ls", L"x\u00DFz") == 4);
 143   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 144   memset (buf, '@', sizeof (buf));
 145   TEST_VERIFY (snprintf (buf, sizeof (buf), "%2.5ls", L"x\u00DFz") == 4);
 146   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 147
 148   /* Varying precisions with width 2, left-justified.  */
 149   memset (buf, '@', sizeof (buf));
 150   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-2.1ls", L"x\u00DFz") == 2);
 151   TEST_VERIFY (strcmp (buf, "x ") == 0);
 152   memset (buf, '@', sizeof (buf));
 153   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-2.2ls", L"x\u00DFz") == 2);
 154   TEST_VERIFY (strcmp (buf, "x ") == 0);
 155   memset (buf, '@', sizeof (buf));
 156   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-2.3ls", L"x\u00DFz") == 3);
 157   TEST_VERIFY (strcmp (buf, "x\xC3\x9F") == 0);
 158   memset (buf, '@', sizeof (buf));
 159   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-2.4ls", L"x\u00DFz") == 4);
 160   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 161   memset (buf, '@', sizeof (buf));
 162   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-2.5ls", L"x\u00DFz") == 4);
 163   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 164
 165   /* Varying precisions with width 3, right-justified.  */
 166   memset (buf, '@', sizeof (buf));
 167   TEST_VERIFY (snprintf (buf, sizeof (buf), "%3.1ls", L"x\u00DFz") == 3);
 168   TEST_VERIFY (strcmp (buf, "  x") == 0);
 169   memset (buf, '@', sizeof (buf));
 170   TEST_VERIFY (snprintf (buf, sizeof (buf), "%3.2ls", L"x\u00DFz") == 3);
 171   TEST_VERIFY (strcmp (buf, "  x") == 0);
 172   memset (buf, '@', sizeof (buf));
 173   TEST_VERIFY (snprintf (buf, sizeof (buf), "%3.3ls", L"x\u00DFz") == 3);
 174   TEST_VERIFY (strcmp (buf, "x\xC3\x9F") == 0);
 175   memset (buf, '@', sizeof (buf));
 176   TEST_VERIFY (snprintf (buf, sizeof (buf), "%3.4ls", L"x\u00DFz") == 4);
 177   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 178   memset (buf, '@', sizeof (buf));
 179   TEST_VERIFY (snprintf (buf, sizeof (buf), "%3.5ls", L"x\u00DFz") == 4);
 180   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 181
 182   /* Varying precisions with width 3, left-justified.  */
 183   memset (buf, '@', sizeof (buf));
 184   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-3.1ls", L"x\u00DFz") == 3);
 185   TEST_VERIFY (strcmp (buf, "x  ") == 0);
 186   memset (buf, '@', sizeof (buf));
 187   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-3.2ls", L"x\u00DFz") == 3);
 188   TEST_VERIFY (strcmp (buf, "x  ") == 0);
 189   memset (buf, '@', sizeof (buf));
 190   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-3.3ls", L"x\u00DFz") == 3);
 191   TEST_VERIFY (strcmp (buf, "x\xC3\x9F") == 0);
 192   memset (buf, '@', sizeof (buf));
 193   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-3.4ls", L"x\u00DFz") == 4);
 194   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 195   memset (buf, '@', sizeof (buf));
 196   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-3.5ls", L"x\u00DFz") == 4);
 197   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 198
 199   /* Varying precisions with width 4, right-justified.  */
 200   memset (buf, '@', sizeof (buf));
 201   TEST_VERIFY (snprintf (buf, sizeof (buf), "%4.1ls", L"x\u00DFz") == 4);
 202   TEST_VERIFY (strcmp (buf, "   x") == 0);
 203   memset (buf, '@', sizeof (buf));
 204   TEST_VERIFY (snprintf (buf, sizeof (buf), "%4.2ls", L"x\u00DFz") == 4);
 205   TEST_VERIFY (strcmp (buf, "   x") == 0);
 206   memset (buf, '@', sizeof (buf));
 207   TEST_VERIFY (snprintf (buf, sizeof (buf), "%4.3ls", L"x\u00DFz") == 4);
 208   TEST_VERIFY (strcmp (buf, " x\xC3\x9F") == 0);
 209   memset (buf, '@', sizeof (buf));
 210   TEST_VERIFY (snprintf (buf, sizeof (buf), "%4.4ls", L"x\u00DFz") == 4);
 211   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 212   memset (buf, '@', sizeof (buf));
 213   TEST_VERIFY (snprintf (buf, sizeof (buf), "%4.5ls", L"x\u00DFz") == 4);
 214   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 215
 216   /* Varying precisions with width 4, left-justified.  */
 217   memset (buf, '@', sizeof (buf));
 218   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-4.1ls", L"x\u00DFz") == 4);
 219   TEST_VERIFY (strcmp (buf, "x   ") == 0);
 220   memset (buf, '@', sizeof (buf));
 221   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-4.2ls", L"x\u00DFz") == 4);
 222   TEST_VERIFY (strcmp (buf, "x   ") == 0);
 223   memset (buf, '@', sizeof (buf));
 224   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-4.3ls", L"x\u00DFz") == 4);
 225   TEST_VERIFY (strcmp (buf, "x\xC3\x9F ") == 0);
 226   memset (buf, '@', sizeof (buf));
 227   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-4.4ls", L"x\u00DFz") == 4);
 228   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 229   memset (buf, '@', sizeof (buf));
 230   TEST_VERIFY (snprintf (buf, sizeof (buf), "%-4.5ls", L"x\u00DFz") == 4);
 231   TEST_VERIFY (strcmp (buf, "x\xC3\x9Fz") == 0);
 232 }
 233
 234 /* swprintf tests (wide string result).  */
 235 static void
 236 test_wide_result (void)
 237 {
 238   enum { size = 20 };
 239   wchar_t buf[20];
 240
 241   /* ASCII wide string.  */
 242   wmemset (buf, '@', size);
 243   TEST_VERIFY (swprintf (buf, size, L"%s", "xyz") == 3);
 244   TEST_VERIFY (wcscmp (buf, L"xyz") == 0);
 245
 246   /* Unicode wide string.  */
 247   wmemset (buf, '@', size);
 248   TEST_VERIFY (swprintf (buf, size, L"%s", "x\xC3\x9Fz") == 3);
 249   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 250
 251   /* Varying precisions.  */
 252   wmemset (buf, '@', size);
 253   TEST_VERIFY (swprintf (buf, size, L"%.1s", "x\xC3\x9Fz") == 1);
 254   TEST_VERIFY (wcscmp (buf, L"x") == 0);
 255   wmemset (buf, '@', size);
 256   TEST_VERIFY (swprintf (buf, size, L"%.2s", "x\xC3\x9Fz") == 2);
 257   TEST_VERIFY (wcscmp (buf, L"x\u00DF") == 0);
 258   wmemset (buf, '@', size);
 259   TEST_VERIFY (swprintf (buf, size, L"%.3s", "x\xC3\x9Fz") == 3);
 260   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 261   wmemset (buf, '@', size);
 262   TEST_VERIFY (swprintf (buf, size, L"%.4s", "x\xC3\x9Fz") == 3);
 263   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 264
 265   /* Varying precisions with width 2, right-justified.  */
 266   wmemset (buf, '@', size);
 267   TEST_VERIFY (swprintf (buf, size, L"%2.1s", "x\xC3\x9Fz") == 2);
 268   TEST_VERIFY (wcscmp (buf, L" x") == 0);
 269   wmemset (buf, '@', size);
 270   TEST_VERIFY (swprintf (buf, size, L"%2.2s", "x\xC3\x9Fz") == 2);
 271   TEST_VERIFY (wcscmp (buf, L"x\u00DF") == 0);
 272   wmemset (buf, '@', size);
 273   TEST_VERIFY (swprintf (buf, size, L"%2.3s", "x\xC3\x9Fz") == 3);
 274   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 275   wmemset (buf, '@', size);
 276   TEST_VERIFY (swprintf (buf, size, L"%2.4s", "x\xC3\x9Fz") == 3);
 277   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 278
 279   /* Varying precisions with width 2, left-justified.  */
 280   wmemset (buf, '@', size);
 281   TEST_VERIFY (swprintf (buf, size, L"%-2.1s", "x\xC3\x9Fz") == 2);
 282   TEST_VERIFY (wcscmp (buf, L"x ") == 0);
 283   wmemset (buf, '@', size);
 284   TEST_VERIFY (swprintf (buf, size, L"%-2.2s", "x\xC3\x9Fz") == 2);
 285   TEST_VERIFY (wcscmp (buf, L"x\u00DF") == 0);
 286   wmemset (buf, '@', size);
 287   TEST_VERIFY (swprintf (buf, size, L"%-2.3s", "x\xC3\x9Fz") == 3);
 288   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 289   wmemset (buf, '@', size);
 290   TEST_VERIFY (swprintf (buf, size, L"%-2.4s", "x\xC3\x9Fz") == 3);
 291   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 292
 293   /* Varying precisions with width 3, right-justified.  */
 294   wmemset (buf, '@', size);
 295   TEST_VERIFY (swprintf (buf, size, L"%3.1s", "x\xC3\x9Fz") == 3);
 296   TEST_VERIFY (wcscmp (buf, L"  x") == 0);
 297   wmemset (buf, '@', size);
 298   TEST_VERIFY (swprintf (buf, size, L"%3.2s", "x\xC3\x9Fz") == 3);
 299   TEST_VERIFY (wcscmp (buf, L" x\u00DF") == 0);
 300   wmemset (buf, '@', size);
 301   TEST_VERIFY (swprintf (buf, size, L"%3.3s", "x\xC3\x9Fz") == 3);
 302   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 303   wmemset (buf, '@', size);
 304   TEST_VERIFY (swprintf (buf, size, L"%3.4s", "x\xC3\x9Fz") == 3);
 305   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 306
 307   /* Varying precisions with width 3, left-justified.  */
 308   wmemset (buf, '@', size);
 309   TEST_VERIFY (swprintf (buf, size, L"%-3.1s", "x\xC3\x9Fz") == 3);
 310   TEST_VERIFY (wcscmp (buf, L"x  ") == 0);
 311   wmemset (buf, '@', size);
 312   TEST_VERIFY (swprintf (buf, size, L"%-3.2s", "x\xC3\x9Fz") == 3);
 313   TEST_VERIFY (wcscmp (buf, L"x\u00DF ") == 0);
 314   wmemset (buf, '@', size);
 315   TEST_VERIFY (swprintf (buf, size, L"%-3.3s", "x\xC3\x9Fz") == 3);
 316   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 317   wmemset (buf, '@', size);
 318   TEST_VERIFY (swprintf (buf, size, L"%-3.4s", "x\xC3\x9Fz") == 3);
 319   TEST_VERIFY (wcscmp (buf, L"x\u00DFz") == 0);
 320
 321   /* Varying precisions with width 4, right-justified.  */
 322   wmemset (buf, '@', size);
 323   TEST_VERIFY (swprintf (buf, size, L"%4.1s", "x\xC3\x9Fz") == 4);
 324   TEST_VERIFY (wcscmp (buf, L"   x") == 0);
 325   wmemset (buf, '@', size);
 326   TEST_VERIFY (swprintf (buf, size, L"%4.2s", "x\xC3\x9Fz") == 4);
 327   TEST_VERIFY (wcscmp (buf, L"  x\u00DF") == 0);
 328   wmemset (buf, '@', size);
 329   TEST_VERIFY (swprintf (buf, size, L"%4.3s", "x\xC3\x9Fz") == 4);
 330   TEST_VERIFY (wcscmp (buf, L" x\u00DFz") == 0);
 331   wmemset (buf, '@', size);
 332   TEST_VERIFY (swprintf (buf, size, L"%4.4s", "x\xC3\x9Fz") == 4);
 333   TEST_VERIFY (wcscmp (buf, L" x\u00DFz") == 0);
 334   wmemset (buf, '@', size);
 335   TEST_VERIFY (swprintf (buf, size, L"%4.5s", "x\xC3\x9Fz") == 4);
 336   TEST_VERIFY (wcscmp (buf, L" x\u00DFz") == 0);
 337
 338   /* Varying precisions with width 4, left-justified.  */
 339   wmemset (buf, '@', size);
 340   TEST_VERIFY (swprintf (buf, size, L"%-4.1s", "x\xC3\x9Fz") == 4);
 341   TEST_VERIFY (wcscmp (buf, L"x   ") == 0);
 342   wmemset (buf, '@', size);
 343   TEST_VERIFY (swprintf (buf, size, L"%-4.2s", "x\xC3\x9Fz") == 4);
 344   TEST_VERIFY (wcscmp (buf, L"x\u00DF  ") == 0);
 345   wmemset (buf, '@', size);
 346   TEST_VERIFY (swprintf (buf, size, L"%-4.3s", "x\xC3\x9Fz") == 4);
 347   TEST_VERIFY (wcscmp (buf, L"x\u00DFz ") == 0);
 348   wmemset (buf, '@', size);
 349   TEST_VERIFY (swprintf (buf, size, L"%-4.4s", "x\xC3\x9Fz") == 4);
 350   TEST_VERIFY (wcscmp (buf, L"x\u00DFz ") == 0);
 351   wmemset (buf, '@', size);
 352   TEST_VERIFY (swprintf (buf, size, L"%-4.5s", "x\xC3\x9Fz") == 4);
 353   TEST_VERIFY (wcscmp (buf, L"x\u00DFz ") == 0);
 354 }
 355
 356 /* Test with long strings and multi-byte result.  */
 357 static void
 358 test_mbs_long (const char *mbs, const wchar_t *wide, const size_t *length)
 359 {
 360   char buf[4000];
 361   _Static_assert (sizeof (buf) > 3 * WIDE_STRING_LENGTH,
 362                   "buffer size consistent with string length");
 363   const char *suffix = "||TERM";
 364   TEST_VERIFY_EXIT (sizeof (buf)
 365                     > length[WIDE_STRING_LENGTH] + strlen (suffix));
 366
 367   /* Test formatting of the entire string.  */
 368   {
 369     int ret = snprintf (buf, sizeof (buf), "%ls%s", wide, suffix);
 370     TEST_VERIFY (ret == length[WIDE_STRING_LENGTH] + strlen (suffix));
 371     TEST_VERIFY (memcmp (buf, mbs, length[WIDE_STRING_LENGTH]) == 0);
 372     TEST_VERIFY (strcmp (buf + length[WIDE_STRING_LENGTH], suffix) == 0);
 373
 374     /* Left-justified string, printed in full.  */
 375     ret = snprintf (buf, sizeof (buf), "%-3500ls%s", wide, suffix);
 376     TEST_VERIFY (ret == 3500 + strlen (suffix));
 377     TEST_VERIFY (memcmp (buf, mbs, length[WIDE_STRING_LENGTH]) == 0);
 378     for (size_t i = length[WIDE_STRING_LENGTH]; i < 3500; ++i)
 379       TEST_VERIFY (buf[i] == ' ');
 380     TEST_VERIFY (strcmp (buf + 3500, suffix) == 0);
 381
 382     /* Right-justified string, printed in full.   */
 383     ret = snprintf (buf, sizeof (buf), "%3500ls%s", wide, suffix);
 384     TEST_VERIFY (ret == 3500 + strlen (suffix));
 385     size_t padding = 3500 - length[WIDE_STRING_LENGTH];
 386     for (size_t i = 0; i < padding; ++i)
 387       TEST_VERIFY (buf[i] == ' ');
 388     TEST_VERIFY (memcmp (buf + padding, mbs, length[WIDE_STRING_LENGTH]) == 0);
 389     TEST_VERIFY (strcmp (buf + 3500, suffix) == 0);
 390   }
 391
 392   size_t wide_characters_converted = 0;
 393   for (int mbs_len = 0; mbs_len <= length[WIDE_STRING_LENGTH] + 1;
 394        ++mbs_len)
 395     {
 396       if (wide_characters_converted < WIDE_STRING_LENGTH
 397           && mbs_len >= length[wide_characters_converted + 1])
 398         /* The requested prefix length contains room for another wide
 399            character.  */
 400         ++wide_characters_converted;
 401       if (test_verbose > 0)
 402         printf ("info: %s: mbs_len=%d wide_chars_converted=%zu length=%zu\n",
 403                 __func__, mbs_len, wide_characters_converted,
 404                 length[wide_characters_converted]);
 405       TEST_VERIFY (length[wide_characters_converted] <= mbs_len);
 406       TEST_VERIFY (wide_characters_converted == 0
 407                    || length[wide_characters_converted - 1] < mbs_len);
 408
 409       int ret = snprintf (buf, sizeof (buf), "%.*ls%s", mbs_len, wide, suffix);
 410       TEST_VERIFY (ret == length[wide_characters_converted] + strlen (suffix));
 411       TEST_VERIFY (memcmp (buf, mbs, length[wide_characters_converted]) == 0);
 412       TEST_VERIFY (strcmp (buf + length[wide_characters_converted],
 413                            suffix) == 0);
 414
 415       /* Left-justified string, printed in full.  */
 416       if (test_verbose)
 417         printf ("info: %s: left-justified\n", __func__);
 418       ret = snprintf (buf, sizeof (buf), "%-3500.*ls%s",
 419                       mbs_len, wide, suffix);
 420       TEST_VERIFY (ret == 3500 + strlen (suffix));
 421       TEST_VERIFY (memcmp (buf, mbs, length[wide_characters_converted]) == 0);
 422       for (size_t i = length[wide_characters_converted]; i < 3500; ++i)
 423         TEST_VERIFY (buf[i] == ' ');
 424       TEST_VERIFY (strcmp (buf + 3500, suffix) == 0);
 425
 426       /* Right-justified string, printed in full.   */
 427       if (test_verbose)
 428         printf ("info: %s: right-justified\n", __func__);
 429       ret = snprintf (buf, sizeof (buf), "%3500.*ls%s", mbs_len, wide, suffix);
 430       TEST_VERIFY (ret == 3500 + strlen (suffix));
 431       size_t padding = 3500 - length[wide_characters_converted];
 432       for (size_t i = 0; i < padding; ++i)
 433         TEST_VERIFY (buf[i] == ' ');
 434       TEST_VERIFY (memcmp (buf + padding, mbs,
 435                            length[wide_characters_converted]) == 0);
 436       TEST_VERIFY (strcmp (buf + 3500, suffix) == 0);
 437     }
 438 }
 439
 440 /* Test with long strings and wide string result.  */
 441 static void
 442 test_wide_long (const char *mbs, const wchar_t *wide, const size_t *length)
 443 {
 444   wchar_t buf[2000];
 445   _Static_assert (sizeof (buf) > sizeof (wchar_t) * WIDE_STRING_LENGTH,
 446                   "buffer size consistent with string length");
 447   const wchar_t *suffix = L"||TERM";
 448   TEST_VERIFY_EXIT (sizeof (buf)
 449                     > length[WIDE_STRING_LENGTH] + wcslen (suffix));
 450
 451   /* Test formatting of the entire string.  */
 452   {
 453     int ret = swprintf (buf, sizeof (buf), L"%s%ls", mbs, suffix);
 454     TEST_VERIFY (ret == WIDE_STRING_LENGTH + wcslen (suffix));
 455     TEST_VERIFY (wmemcmp (buf, wide, WIDE_STRING_LENGTH) == 0);
 456     TEST_VERIFY (wcscmp (buf + WIDE_STRING_LENGTH, suffix) == 0);
 457
 458     /* Left-justified string, printed in full.  */
 459     ret = swprintf (buf, sizeof (buf), L"%-1500s%ls", mbs, suffix);
 460     TEST_VERIFY (ret == 1500 + wcslen (suffix));
 461     TEST_VERIFY (wmemcmp (buf, wide, WIDE_STRING_LENGTH) == 0);
 462     for (size_t i = WIDE_STRING_LENGTH; i < 1500; ++i)
 463       TEST_VERIFY (buf[i] == L' ');
 464     TEST_VERIFY (wcscmp (buf + 1500, suffix) == 0);
 465
 466     /* Right-justified string, printed in full.   */
 467     ret = swprintf (buf, sizeof (buf), L"%1500s%ls", mbs, suffix);
 468     TEST_VERIFY (ret == 1500 + wcslen (suffix));
 469     size_t padding = 1500 - WIDE_STRING_LENGTH;
 470     for (size_t i = 0; i < padding; ++i)
 471       TEST_VERIFY (buf[i] == ' ');
 472     TEST_VERIFY (wmemcmp (buf + padding, wide, WIDE_STRING_LENGTH) == 0);
 473     TEST_VERIFY (wcscmp (buf + 1500, suffix) == 0);
 474   }
 475
 476   for (int wide_len = 0; wide_len <= WIDE_STRING_LENGTH + 1; ++wide_len)
 477     {
 478       size_t actual_wide_len;
 479       if (wide_len < WIDE_STRING_LENGTH)
 480         actual_wide_len = wide_len;
 481       else
 482         actual_wide_len = WIDE_STRING_LENGTH;
 483       if (test_verbose > 0)
 484         printf ("info: %s: wide_len=%d actual_wide_len=%zu\n",
 485                 __func__, wide_len, actual_wide_len);
 486
 487       int ret = swprintf (buf, sizeof (buf), L"%.*s%ls",
 488                           wide_len, mbs, suffix);
 489       TEST_VERIFY (ret == actual_wide_len + wcslen (suffix));
 490       TEST_VERIFY (wmemcmp (buf, wide, actual_wide_len) == 0);
 491       TEST_VERIFY (wcscmp (buf + actual_wide_len, suffix) == 0);
 492
 493       /* Left-justified string, printed in full.  */
 494       ret = swprintf (buf, sizeof (buf), L"%-1500.*s%ls",
 495                       wide_len, mbs, suffix);
 496       TEST_VERIFY (ret == 1500 + wcslen (suffix));
 497       TEST_VERIFY (wmemcmp (buf, wide, actual_wide_len) == 0);
 498       for (size_t i = actual_wide_len; i < 1500; ++i)
 499         TEST_VERIFY (buf[i] == L' ');
 500       TEST_VERIFY (wcscmp (buf + 1500, suffix) == 0);
 501
 502       /* Right-justified string, printed in full.   */
 503       ret = swprintf (buf, sizeof (buf), L"%1500.*s%ls",
 504                       wide_len, mbs, suffix);
 505       TEST_VERIFY (ret == 1500 + wcslen (suffix));
 506       size_t padding = 1500 - actual_wide_len;
 507       for (size_t i = 0; i < padding; ++i)
 508         TEST_VERIFY (buf[i] == L' ');
 509       TEST_VERIFY (wmemcmp (buf + padding, wide, actual_wide_len) == 0);
 510       TEST_VERIFY (wcscmp (buf + 1500, suffix) == 0);
 511     }
 512 }
 513
 514 static int
 515 do_test (void)
 516 {
 517   /* This test only covers UTF-8 as a multi-byte character set.  A
 518      locale with a multi-byte character set with shift state would be
 519      a relevant test target as well, but glibc currently does not ship
 520      such a locale.  */
 521   TEST_VERIFY (setlocale (LC_CTYPE, "de_DE.UTF-8") != NULL);
 522
 523   test_mbs_result ();
 524   test_wide_result ();
 525
 526   char *mbs;
 527   wchar_t *wide;
 528   size_t *length;
 529   make_random_string (&mbs, &wide, &length);
 530   TEST_VERIFY (strlen (mbs) == length[WIDE_STRING_LENGTH]);
 531   if (test_verbose > 0)
 532     printf ("info: long multi-byte string contains %zu characters\n",
 533             length[WIDE_STRING_LENGTH]);
 534   test_mbs_long (mbs, wide, length);
 535   test_wide_long (mbs, wide, length);
 536   free (mbs);
 537   free (wide);
 538   free (length);
 539
 540   return 0;
 541 }
 542
 543 #include <support/test-driver.c>