1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <gtest/gtest.h> 18 19 #include <errno.h> 20 #include <fcntl.h> 21 #include <limits.h> 22 #include <math.h> 23 #include <stdio.h> 24 #include <sys/types.h> 25 #include <sys/socket.h> 26 #include <sys/stat.h> 27 #include <unistd.h> 28 #include <wchar.h> 29 #include <locale.h> 30 31 #include <string> 32 #include <thread> 33 #include <vector> 34 35 #include <android-base/file.h> 36 37 #include "BionicDeathTest.h" 38 #include "utils.h" 39 40 #if defined(NOFORTIFY) 41 #define STDIO_TEST stdio_nofortify 42 #define STDIO_DEATHTEST stdio_nofortify_DeathTest 43 #else 44 #define STDIO_TEST stdio 45 #define STDIO_DEATHTEST stdio_DeathTest 46 #endif 47 48 using namespace std::string_literals; 49 50 class stdio_DeathTest : public BionicDeathTest {}; 51 class stdio_nofortify_DeathTest : public BionicDeathTest {}; 52 53 static void SetFileTo(const char* path, const char* content) { 54 FILE* fp; 55 ASSERT_NE(nullptr, fp = fopen(path, "w")); 56 ASSERT_NE(EOF, fputs(content, fp)); 57 ASSERT_EQ(0, fclose(fp)); 58 } 59 60 static void AssertFileIs(const char* path, const char* expected) { 61 FILE* fp; 62 ASSERT_NE(nullptr, fp = fopen(path, "r")); 63 char* line = nullptr; 64 size_t length; 65 ASSERT_NE(EOF, getline(&line, &length, fp)); 66 ASSERT_EQ(0, fclose(fp)); 67 ASSERT_STREQ(expected, line); 68 free(line); 69 } 70 71 static void AssertFileIs(FILE* fp, const char* expected, bool is_fmemopen = false) { 72 rewind(fp); 73 74 char line[1024]; 75 memset(line, 0xff, sizeof(line)); 76 ASSERT_EQ(line, fgets(line, sizeof(line), fp)); 77 ASSERT_STREQ(expected, line); 78 79 if (is_fmemopen) { 80 // fmemopen appends a trailing NUL byte, which probably shouldn't show up as an 81 // extra empty line, but does on every C library I tested... 82 ASSERT_EQ(line, fgets(line, sizeof(line), fp)); 83 ASSERT_STREQ("", line); 84 } 85 86 // Make sure there isn't anything else in the file. 87 ASSERT_EQ(nullptr, fgets(line, sizeof(line), fp)) << "junk at end of file: " << line; 88 } 89 90 TEST(STDIO_TEST, flockfile_18208568_stderr) { 91 // Check that we have a _recursive_ mutex for flockfile. 92 flockfile(stderr); 93 feof(stderr); // We don't care about the result, but this needs to take the lock. 94 funlockfile(stderr); 95 } 96 97 TEST(STDIO_TEST, flockfile_18208568_regular) { 98 // We never had a bug for streams other than stdin/stdout/stderr, but test anyway. 99 FILE* fp = fopen("/dev/null", "w"); 100 ASSERT_TRUE(fp != nullptr); 101 flockfile(fp); 102 feof(fp); 103 funlockfile(fp); 104 fclose(fp); 105 } 106 107 TEST(STDIO_TEST, tmpfile_fileno_fprintf_rewind_fgets) { 108 FILE* fp = tmpfile(); 109 ASSERT_TRUE(fp != nullptr); 110 111 int fd = fileno(fp); 112 ASSERT_NE(fd, -1); 113 114 struct stat sb; 115 int rc = fstat(fd, &sb); 116 ASSERT_NE(rc, -1); 117 ASSERT_EQ(sb.st_mode & 0777, 0600U); 118 119 rc = fprintf(fp, "hello\n"); 120 ASSERT_EQ(rc, 6); 121 122 AssertFileIs(fp, "hello\n"); 123 fclose(fp); 124 } 125 126 TEST(STDIO_TEST, tmpfile64) { 127 FILE* fp = tmpfile64(); 128 ASSERT_TRUE(fp != nullptr); 129 fclose(fp); 130 } 131 132 TEST(STDIO_TEST, dprintf) { 133 TemporaryFile tf; 134 135 int rc = dprintf(tf.fd, "hello\n"); 136 ASSERT_EQ(rc, 6); 137 138 lseek(tf.fd, 0, SEEK_SET); 139 FILE* tfile = fdopen(tf.fd, "r"); 140 ASSERT_TRUE(tfile != nullptr); 141 142 AssertFileIs(tfile, "hello\n"); 143 fclose(tfile); 144 } 145 146 TEST(STDIO_TEST, getdelim) { 147 FILE* fp = tmpfile(); 148 ASSERT_TRUE(fp != nullptr); 149 150 const char* line_written = "This is a test"; 151 int rc = fprintf(fp, "%s", line_written); 152 ASSERT_EQ(rc, static_cast<int>(strlen(line_written))); 153 154 rewind(fp); 155 156 char* word_read = nullptr; 157 size_t allocated_length = 0; 158 159 const char* expected[] = { "This ", " ", "is ", "a ", "test" }; 160 for (size_t i = 0; i < 5; ++i) { 161 ASSERT_FALSE(feof(fp)); 162 ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), static_cast<int>(strlen(expected[i]))); 163 ASSERT_GE(allocated_length, strlen(expected[i])); 164 ASSERT_STREQ(expected[i], word_read); 165 } 166 // The last read should have set the end-of-file indicator for the stream. 167 ASSERT_TRUE(feof(fp)); 168 clearerr(fp); 169 170 // getdelim returns -1 but doesn't set errno if we're already at EOF. 171 // It should set the end-of-file indicator for the stream, though. 172 errno = 0; 173 ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), -1); 174 ASSERT_EQ(0, errno); 175 ASSERT_TRUE(feof(fp)); 176 177 free(word_read); 178 fclose(fp); 179 } 180 181 TEST(STDIO_TEST, getdelim_invalid) { 182 FILE* fp = tmpfile(); 183 ASSERT_TRUE(fp != nullptr); 184 185 char* buffer = nullptr; 186 size_t buffer_length = 0; 187 188 // The first argument can't be NULL. 189 errno = 0; 190 ASSERT_EQ(getdelim(nullptr, &buffer_length, ' ', fp), -1); 191 ASSERT_EQ(EINVAL, errno); 192 193 // The second argument can't be NULL. 194 errno = 0; 195 ASSERT_EQ(getdelim(&buffer, nullptr, ' ', fp), -1); 196 ASSERT_EQ(EINVAL, errno); 197 fclose(fp); 198 } 199 200 TEST(STDIO_TEST, getdelim_directory) { 201 FILE* fp = fopen("/proc", "r"); 202 ASSERT_TRUE(fp != nullptr); 203 char* word_read; 204 size_t allocated_length; 205 ASSERT_EQ(-1, getdelim(&word_read, &allocated_length, ' ', fp)); 206 fclose(fp); 207 } 208 209 TEST(STDIO_TEST, getline) { 210 FILE* fp = tmpfile(); 211 ASSERT_TRUE(fp != nullptr); 212 213 const char* line_written = "This is a test for getline\n"; 214 const size_t line_count = 5; 215 216 for (size_t i = 0; i < line_count; ++i) { 217 int rc = fprintf(fp, "%s", line_written); 218 ASSERT_EQ(rc, static_cast<int>(strlen(line_written))); 219 } 220 221 rewind(fp); 222 223 char* line_read = nullptr; 224 size_t allocated_length = 0; 225 226 size_t read_line_count = 0; 227 ssize_t read_char_count; 228 while ((read_char_count = getline(&line_read, &allocated_length, fp)) != -1) { 229 ASSERT_EQ(read_char_count, static_cast<int>(strlen(line_written))); 230 ASSERT_GE(allocated_length, strlen(line_written)); 231 ASSERT_STREQ(line_written, line_read); 232 ++read_line_count; 233 } 234 ASSERT_EQ(read_line_count, line_count); 235 236 // The last read should have set the end-of-file indicator for the stream. 237 ASSERT_TRUE(feof(fp)); 238 clearerr(fp); 239 240 // getline returns -1 but doesn't set errno if we're already at EOF. 241 // It should set the end-of-file indicator for the stream, though. 242 errno = 0; 243 ASSERT_EQ(getline(&line_read, &allocated_length, fp), -1); 244 ASSERT_EQ(0, errno); 245 ASSERT_TRUE(feof(fp)); 246 247 free(line_read); 248 fclose(fp); 249 } 250 251 TEST(STDIO_TEST, getline_invalid) { 252 FILE* fp = tmpfile(); 253 ASSERT_TRUE(fp != nullptr); 254 255 char* buffer = nullptr; 256 size_t buffer_length = 0; 257 258 // The first argument can't be NULL. 259 errno = 0; 260 ASSERT_EQ(getline(nullptr, &buffer_length, fp), -1); 261 ASSERT_EQ(EINVAL, errno); 262 263 // The second argument can't be NULL. 264 errno = 0; 265 ASSERT_EQ(getline(&buffer, nullptr, fp), -1); 266 ASSERT_EQ(EINVAL, errno); 267 fclose(fp); 268 } 269 270 TEST(STDIO_TEST, printf_ssize_t) { 271 // http://b/8253769 272 ASSERT_EQ(sizeof(ssize_t), sizeof(long int)); 273 ASSERT_EQ(sizeof(ssize_t), sizeof(size_t)); 274 // For our 32-bit ABI, we had a ssize_t definition that confuses GCC into saying: 275 // error: format '%zd' expects argument of type 'signed size_t', 276 // but argument 4 has type 'ssize_t {aka long int}' [-Werror=format] 277 ssize_t v = 1; 278 char buf[32]; 279 snprintf(buf, sizeof(buf), "%zd", v); 280 } 281 282 // https://code.google.com/p/android/issues/detail?id=64886 283 TEST(STDIO_TEST, snprintf_a) { 284 char buf[BUFSIZ]; 285 EXPECT_EQ(23, snprintf(buf, sizeof(buf), "<%a>", 9990.235)); 286 EXPECT_STREQ("<0x1.3831e147ae148p+13>", buf); 287 } 288 289 TEST(STDIO_TEST, snprintf_lc) { 290 char buf[BUFSIZ]; 291 wint_t wc = L'a'; 292 EXPECT_EQ(3, snprintf(buf, sizeof(buf), "<%lc>", wc)); 293 EXPECT_STREQ("<a>", buf); 294 } 295 296 TEST(STDIO_TEST, snprintf_C) { // Synonym for %lc. 297 char buf[BUFSIZ]; 298 wchar_t wc = L'a'; 299 EXPECT_EQ(3, snprintf(buf, sizeof(buf), "<%C>", wc)); 300 EXPECT_STREQ("<a>", buf); 301 } 302 303 TEST(STDIO_TEST, snprintf_ls) { 304 char buf[BUFSIZ]; 305 wchar_t* ws = nullptr; 306 EXPECT_EQ(8, snprintf(buf, sizeof(buf), "<%ls>", ws)); 307 EXPECT_STREQ("<(null)>", buf); 308 309 wchar_t chars[] = { L'h', L'i', 0 }; 310 ws = chars; 311 EXPECT_EQ(4, snprintf(buf, sizeof(buf), "<%ls>", ws)); 312 EXPECT_STREQ("<hi>", buf); 313 } 314 315 TEST(STDIO_TEST, snprintf_S) { // Synonym for %ls. 316 char buf[BUFSIZ]; 317 wchar_t* ws = nullptr; 318 EXPECT_EQ(8, snprintf(buf, sizeof(buf), "<%S>", ws)); 319 EXPECT_STREQ("<(null)>", buf); 320 321 wchar_t chars[] = { L'h', L'i', 0 }; 322 ws = chars; 323 EXPECT_EQ(4, snprintf(buf, sizeof(buf), "<%S>", ws)); 324 EXPECT_STREQ("<hi>", buf); 325 } 326 327 TEST(STDIO_TEST, snprintf_n) { 328 #if defined(__BIONIC__) 329 // http://b/14492135 and http://b/31832608. 330 char buf[32]; 331 int i = 1234; 332 EXPECT_DEATH(snprintf(buf, sizeof(buf), "a %n b", &i), "%n not allowed on Android"); 333 #else 334 GTEST_SKIP() << "glibc does allow %n"; 335 #endif 336 } 337 338 TEST(STDIO_TEST, snprintf_smoke) { 339 char buf[BUFSIZ]; 340 341 snprintf(buf, sizeof(buf), "a"); 342 EXPECT_STREQ("a", buf); 343 344 snprintf(buf, sizeof(buf), "%%"); 345 EXPECT_STREQ("%", buf); 346 347 snprintf(buf, sizeof(buf), "01234"); 348 EXPECT_STREQ("01234", buf); 349 350 snprintf(buf, sizeof(buf), "a%sb", "01234"); 351 EXPECT_STREQ("a01234b", buf); 352 353 char* s = nullptr; 354 snprintf(buf, sizeof(buf), "a%sb", s); 355 EXPECT_STREQ("a(null)b", buf); 356 357 snprintf(buf, sizeof(buf), "aa%scc", "bb"); 358 EXPECT_STREQ("aabbcc", buf); 359 360 snprintf(buf, sizeof(buf), "a%cc", 'b'); 361 EXPECT_STREQ("abc", buf); 362 363 snprintf(buf, sizeof(buf), "a%db", 1234); 364 EXPECT_STREQ("a1234b", buf); 365 366 snprintf(buf, sizeof(buf), "a%db", -8123); 367 EXPECT_STREQ("a-8123b", buf); 368 369 snprintf(buf, sizeof(buf), "a%hdb", static_cast<short>(0x7fff0010)); 370 EXPECT_STREQ("a16b", buf); 371 372 snprintf(buf, sizeof(buf), "a%hhdb", static_cast<char>(0x7fffff10)); 373 EXPECT_STREQ("a16b", buf); 374 375 snprintf(buf, sizeof(buf), "a%lldb", 0x1000000000LL); 376 EXPECT_STREQ("a68719476736b", buf); 377 378 snprintf(buf, sizeof(buf), "a%ldb", 70000L); 379 EXPECT_STREQ("a70000b", buf); 380 381 snprintf(buf, sizeof(buf), "a%pb", reinterpret_cast<void*>(0xb0001234)); 382 EXPECT_STREQ("a0xb0001234b", buf); 383 384 snprintf(buf, sizeof(buf), "a%xz", 0x12ab); 385 EXPECT_STREQ("a12abz", buf); 386 387 snprintf(buf, sizeof(buf), "a%Xz", 0x12ab); 388 EXPECT_STREQ("a12ABz", buf); 389 390 snprintf(buf, sizeof(buf), "a%08xz", 0x123456); 391 EXPECT_STREQ("a00123456z", buf); 392 393 snprintf(buf, sizeof(buf), "a%5dz", 1234); 394 EXPECT_STREQ("a 1234z", buf); 395 396 snprintf(buf, sizeof(buf), "a%05dz", 1234); 397 EXPECT_STREQ("a01234z", buf); 398 399 snprintf(buf, sizeof(buf), "a%8dz", 1234); 400 EXPECT_STREQ("a 1234z", buf); 401 402 snprintf(buf, sizeof(buf), "a%-8dz", 1234); 403 EXPECT_STREQ("a1234 z", buf); 404 405 snprintf(buf, sizeof(buf), "A%-11sZ", "abcdef"); 406 EXPECT_STREQ("Aabcdef Z", buf); 407 408 snprintf(buf, sizeof(buf), "A%s:%dZ", "hello", 1234); 409 EXPECT_STREQ("Ahello:1234Z", buf); 410 411 snprintf(buf, sizeof(buf), "a%03d:%d:%02dz", 5, 5, 5); 412 EXPECT_STREQ("a005:5:05z", buf); 413 414 void* p = nullptr; 415 snprintf(buf, sizeof(buf), "a%d,%pz", 5, p); 416 #if defined(__BIONIC__) 417 EXPECT_STREQ("a5,0x0z", buf); 418 #else // __BIONIC__ 419 EXPECT_STREQ("a5,(nil)z", buf); 420 #endif // __BIONIC__ 421 422 snprintf(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8); 423 EXPECT_STREQ("a68719476736,6,7,8z", buf); 424 425 snprintf(buf, sizeof(buf), "a_%f_b", 1.23f); 426 EXPECT_STREQ("a_1.230000_b", buf); 427 428 snprintf(buf, sizeof(buf), "a_%g_b", 3.14); 429 EXPECT_STREQ("a_3.14_b", buf); 430 431 snprintf(buf, sizeof(buf), "%1$s %1$s", "print_me_twice"); 432 EXPECT_STREQ("print_me_twice print_me_twice", buf); 433 } 434 435 template <typename T> 436 static void CheckInfNan(int snprintf_fn(T*, size_t, const T*, ...), 437 int sscanf_fn(const T*, const T*, ...), 438 const T* fmt_string, const T* fmt, const T* fmt_plus, 439 const T* minus_inf, const T* inf_, const T* plus_inf, 440 const T* minus_nan, const T* nan_, const T* plus_nan) { 441 T buf[BUFSIZ]; 442 float f; 443 444 // NaN. 445 446 snprintf_fn(buf, sizeof(buf), fmt, nanf("")); 447 EXPECT_STREQ(nan_, buf) << fmt; 448 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 449 EXPECT_TRUE(isnan(f)); 450 451 snprintf_fn(buf, sizeof(buf), fmt, -nanf("")); 452 EXPECT_STREQ(minus_nan, buf) << fmt; 453 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 454 EXPECT_TRUE(isnan(f)); 455 456 snprintf_fn(buf, sizeof(buf), fmt_plus, nanf("")); 457 EXPECT_STREQ(plus_nan, buf) << fmt_plus; 458 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 459 EXPECT_TRUE(isnan(f)); 460 461 snprintf_fn(buf, sizeof(buf), fmt_plus, -nanf("")); 462 EXPECT_STREQ(minus_nan, buf) << fmt_plus; 463 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 464 EXPECT_TRUE(isnan(f)); 465 466 // Inf. 467 468 snprintf_fn(buf, sizeof(buf), fmt, HUGE_VALF); 469 EXPECT_STREQ(inf_, buf) << fmt; 470 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 471 EXPECT_EQ(HUGE_VALF, f); 472 473 snprintf_fn(buf, sizeof(buf), fmt, -HUGE_VALF); 474 EXPECT_STREQ(minus_inf, buf) << fmt; 475 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 476 EXPECT_EQ(-HUGE_VALF, f); 477 478 snprintf_fn(buf, sizeof(buf), fmt_plus, HUGE_VALF); 479 EXPECT_STREQ(plus_inf, buf) << fmt_plus; 480 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 481 EXPECT_EQ(HUGE_VALF, f); 482 483 snprintf_fn(buf, sizeof(buf), fmt_plus, -HUGE_VALF); 484 EXPECT_STREQ(minus_inf, buf) << fmt_plus; 485 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)); 486 EXPECT_EQ(-HUGE_VALF, f); 487 488 // Check case-insensitivity. 489 snprintf_fn(buf, sizeof(buf), fmt_string, "[InFiNiTy]"); 490 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)) << buf; 491 EXPECT_EQ(HUGE_VALF, f); 492 snprintf_fn(buf, sizeof(buf), fmt_string, "[NaN]"); 493 EXPECT_EQ(1, sscanf_fn(buf, fmt, &f)) << buf; 494 EXPECT_TRUE(isnan(f)); 495 } 496 497 TEST(STDIO_TEST, snprintf_sscanf_inf_nan) { 498 CheckInfNan(snprintf, sscanf, "%s", 499 "[%a]", "[%+a]", 500 "[-inf]", "[inf]", "[+inf]", 501 "[-nan]", "[nan]", "[+nan]"); 502 CheckInfNan(snprintf, sscanf, "%s", 503 "[%A]", "[%+A]", 504 "[-INF]", "[INF]", "[+INF]", 505 "[-NAN]", "[NAN]", "[+NAN]"); 506 CheckInfNan(snprintf, sscanf, "%s", 507 "[%e]", "[%+e]", 508 "[-inf]", "[inf]", "[+inf]", 509 "[-nan]", "[nan]", "[+nan]"); 510 CheckInfNan(snprintf, sscanf, "%s", 511 "[%E]", "[%+E]", 512 "[-INF]", "[INF]", "[+INF]", 513 "[-NAN]", "[NAN]", "[+NAN]"); 514 CheckInfNan(snprintf, sscanf, "%s", 515 "[%f]", "[%+f]", 516 "[-inf]", "[inf]", "[+inf]", 517 "[-nan]", "[nan]", "[+nan]"); 518 CheckInfNan(snprintf, sscanf, "%s", 519 "[%F]", "[%+F]", 520 "[-INF]", "[INF]", "[+INF]", 521 "[-NAN]", "[NAN]", "[+NAN]"); 522 CheckInfNan(snprintf, sscanf, "%s", 523 "[%g]", "[%+g]", 524 "[-inf]", "[inf]", "[+inf]", 525 "[-nan]", "[nan]", "[+nan]"); 526 CheckInfNan(snprintf, sscanf, "%s", 527 "[%G]", "[%+G]", 528 "[-INF]", "[INF]", "[+INF]", 529 "[-NAN]", "[NAN]", "[+NAN]"); 530 } 531 532 TEST(STDIO_TEST, swprintf_swscanf_inf_nan) { 533 CheckInfNan(swprintf, swscanf, L"%s", 534 L"[%a]", L"[%+a]", 535 L"[-inf]", L"[inf]", L"[+inf]", 536 L"[-nan]", L"[nan]", L"[+nan]"); 537 CheckInfNan(swprintf, swscanf, L"%s", 538 L"[%A]", L"[%+A]", 539 L"[-INF]", L"[INF]", L"[+INF]", 540 L"[-NAN]", L"[NAN]", L"[+NAN]"); 541 CheckInfNan(swprintf, swscanf, L"%s", 542 L"[%e]", L"[%+e]", 543 L"[-inf]", L"[inf]", L"[+inf]", 544 L"[-nan]", L"[nan]", L"[+nan]"); 545 CheckInfNan(swprintf, swscanf, L"%s", 546 L"[%E]", L"[%+E]", 547 L"[-INF]", L"[INF]", L"[+INF]", 548 L"[-NAN]", L"[NAN]", L"[+NAN]"); 549 CheckInfNan(swprintf, swscanf, L"%s", 550 L"[%f]", L"[%+f]", 551 L"[-inf]", L"[inf]", L"[+inf]", 552 L"[-nan]", L"[nan]", L"[+nan]"); 553 CheckInfNan(swprintf, swscanf, L"%s", 554 L"[%F]", L"[%+F]", 555 L"[-INF]", L"[INF]", L"[+INF]", 556 L"[-NAN]", L"[NAN]", L"[+NAN]"); 557 CheckInfNan(swprintf, swscanf, L"%s", 558 L"[%g]", L"[%+g]", 559 L"[-inf]", L"[inf]", L"[+inf]", 560 L"[-nan]", L"[nan]", L"[+nan]"); 561 CheckInfNan(swprintf, swscanf, L"%s", 562 L"[%G]", L"[%+G]", 563 L"[-INF]", L"[INF]", L"[+INF]", 564 L"[-NAN]", L"[NAN]", L"[+NAN]"); 565 } 566 567 TEST(STDIO_TEST, swprintf) { 568 constexpr size_t nchars = 32; 569 wchar_t buf[nchars]; 570 571 ASSERT_EQ(2, swprintf(buf, nchars, L"ab")) << strerror(errno); 572 ASSERT_EQ(std::wstring(L"ab"), buf); 573 ASSERT_EQ(5, swprintf(buf, nchars, L"%s", "abcde")); 574 ASSERT_EQ(std::wstring(L"abcde"), buf); 575 576 // Unlike swprintf(), swprintf() returns -1 in case of truncation 577 // and doesn't necessarily zero-terminate the output! 578 ASSERT_EQ(-1, swprintf(buf, 4, L"%s", "abcde")); 579 580 const char kString[] = "Hello, World"; 581 ASSERT_EQ(12, swprintf(buf, nchars, L"%s", kString)); 582 ASSERT_EQ(std::wstring(L"Hello, World"), buf); 583 ASSERT_EQ(12, swprintf(buf, 13, L"%s", kString)); 584 ASSERT_EQ(std::wstring(L"Hello, World"), buf); 585 } 586 587 TEST(STDIO_TEST, swprintf_a) { 588 constexpr size_t nchars = 32; 589 wchar_t buf[nchars]; 590 591 ASSERT_EQ(20, swprintf(buf, nchars, L"%a", 3.1415926535)); 592 ASSERT_EQ(std::wstring(L"0x1.921fb54411744p+1"), buf); 593 } 594 595 TEST(STDIO_TEST, swprintf_lc) { 596 constexpr size_t nchars = 32; 597 wchar_t buf[nchars]; 598 599 wint_t wc = L'a'; 600 EXPECT_EQ(3, swprintf(buf, nchars, L"<%lc>", wc)); 601 EXPECT_EQ(std::wstring(L"<a>"), buf); 602 } 603 604 TEST(STDIO_TEST, swprintf_C) { // Synonym for %lc. 605 constexpr size_t nchars = 32; 606 wchar_t buf[nchars]; 607 608 wint_t wc = L'a'; 609 EXPECT_EQ(3, swprintf(buf, nchars, L"<%C>", wc)); 610 EXPECT_EQ(std::wstring(L"<a>"), buf); 611 } 612 613 TEST(STDIO_TEST, swprintf_jd_INTMAX_MAX) { 614 constexpr size_t nchars = 32; 615 wchar_t buf[nchars]; 616 617 swprintf(buf, nchars, L"%jd", INTMAX_MAX); 618 EXPECT_EQ(std::wstring(L"9223372036854775807"), buf); 619 } 620 621 TEST(STDIO_TEST, swprintf_jd_INTMAX_MIN) { 622 constexpr size_t nchars = 32; 623 wchar_t buf[nchars]; 624 625 swprintf(buf, nchars, L"%jd", INTMAX_MIN); 626 EXPECT_EQ(std::wstring(L"-9223372036854775808"), buf); 627 } 628 629 TEST(STDIO_TEST, swprintf_ju_UINTMAX_MAX) { 630 constexpr size_t nchars = 32; 631 wchar_t buf[nchars]; 632 633 swprintf(buf, nchars, L"%ju", UINTMAX_MAX); 634 EXPECT_EQ(std::wstring(L"18446744073709551615"), buf); 635 } 636 637 TEST(STDIO_TEST, swprintf_1$ju_UINTMAX_MAX) { 638 constexpr size_t nchars = 32; 639 wchar_t buf[nchars]; 640 641 swprintf(buf, nchars, L"%1$ju", UINTMAX_MAX); 642 EXPECT_EQ(std::wstring(L"18446744073709551615"), buf); 643 } 644 645 TEST(STDIO_TEST, swprintf_ls) { 646 constexpr size_t nchars = 32; 647 wchar_t buf[nchars]; 648 649 static const wchar_t kWideString[] = L"Hello\uff41 World"; 650 ASSERT_EQ(12, swprintf(buf, nchars, L"%ls", kWideString)); 651 ASSERT_EQ(std::wstring(kWideString), buf); 652 ASSERT_EQ(12, swprintf(buf, 13, L"%ls", kWideString)); 653 ASSERT_EQ(std::wstring(kWideString), buf); 654 } 655 656 TEST(STDIO_TEST, swprintf_S) { // Synonym for %ls. 657 constexpr size_t nchars = 32; 658 wchar_t buf[nchars]; 659 660 static const wchar_t kWideString[] = L"Hello\uff41 World"; 661 ASSERT_EQ(12, swprintf(buf, nchars, L"%S", kWideString)); 662 ASSERT_EQ(std::wstring(kWideString), buf); 663 ASSERT_EQ(12, swprintf(buf, 13, L"%S", kWideString)); 664 ASSERT_EQ(std::wstring(kWideString), buf); 665 } 666 667 TEST(STDIO_TEST, snprintf_d_INT_MAX) { 668 char buf[BUFSIZ]; 669 snprintf(buf, sizeof(buf), "%d", INT_MAX); 670 EXPECT_STREQ("2147483647", buf); 671 } 672 673 TEST(STDIO_TEST, snprintf_d_INT_MIN) { 674 char buf[BUFSIZ]; 675 snprintf(buf, sizeof(buf), "%d", INT_MIN); 676 EXPECT_STREQ("-2147483648", buf); 677 } 678 679 TEST(STDIO_TEST, snprintf_jd_INTMAX_MAX) { 680 char buf[BUFSIZ]; 681 snprintf(buf, sizeof(buf), "%jd", INTMAX_MAX); 682 EXPECT_STREQ("9223372036854775807", buf); 683 } 684 685 TEST(STDIO_TEST, snprintf_jd_INTMAX_MIN) { 686 char buf[BUFSIZ]; 687 snprintf(buf, sizeof(buf), "%jd", INTMAX_MIN); 688 EXPECT_STREQ("-9223372036854775808", buf); 689 } 690 691 TEST(STDIO_TEST, snprintf_ju_UINTMAX_MAX) { 692 char buf[BUFSIZ]; 693 snprintf(buf, sizeof(buf), "%ju", UINTMAX_MAX); 694 EXPECT_STREQ("18446744073709551615", buf); 695 } 696 697 TEST(STDIO_TEST, snprintf_1$ju_UINTMAX_MAX) { 698 char buf[BUFSIZ]; 699 snprintf(buf, sizeof(buf), "%1$ju", UINTMAX_MAX); 700 EXPECT_STREQ("18446744073709551615", buf); 701 } 702 703 TEST(STDIO_TEST, snprintf_ld_LONG_MAX) { 704 char buf[BUFSIZ]; 705 snprintf(buf, sizeof(buf), "%ld", LONG_MAX); 706 #if defined(__LP64__) 707 EXPECT_STREQ("9223372036854775807", buf); 708 #else 709 EXPECT_STREQ("2147483647", buf); 710 #endif 711 } 712 713 TEST(STDIO_TEST, snprintf_ld_LONG_MIN) { 714 char buf[BUFSIZ]; 715 snprintf(buf, sizeof(buf), "%ld", LONG_MIN); 716 #if defined(__LP64__) 717 EXPECT_STREQ("-9223372036854775808", buf); 718 #else 719 EXPECT_STREQ("-2147483648", buf); 720 #endif 721 } 722 723 TEST(STDIO_TEST, snprintf_lld_LLONG_MAX) { 724 char buf[BUFSIZ]; 725 snprintf(buf, sizeof(buf), "%lld", LLONG_MAX); 726 EXPECT_STREQ("9223372036854775807", buf); 727 } 728 729 TEST(STDIO_TEST, snprintf_lld_LLONG_MIN) { 730 char buf[BUFSIZ]; 731 snprintf(buf, sizeof(buf), "%lld", LLONG_MIN); 732 EXPECT_STREQ("-9223372036854775808", buf); 733 } 734 735 TEST(STDIO_TEST, snprintf_o_UINT_MAX) { 736 char buf[BUFSIZ]; 737 snprintf(buf, sizeof(buf), "%o", UINT_MAX); 738 EXPECT_STREQ("37777777777", buf); 739 } 740 741 TEST(STDIO_TEST, snprintf_u_UINT_MAX) { 742 char buf[BUFSIZ]; 743 snprintf(buf, sizeof(buf), "%u", UINT_MAX); 744 EXPECT_STREQ("4294967295", buf); 745 } 746 747 TEST(STDIO_TEST, snprintf_x_UINT_MAX) { 748 char buf[BUFSIZ]; 749 snprintf(buf, sizeof(buf), "%x", UINT_MAX); 750 EXPECT_STREQ("ffffffff", buf); 751 } 752 753 TEST(STDIO_TEST, snprintf_X_UINT_MAX) { 754 char buf[BUFSIZ]; 755 snprintf(buf, sizeof(buf), "%X", UINT_MAX); 756 EXPECT_STREQ("FFFFFFFF", buf); 757 } 758 759 TEST(STDIO_TEST, snprintf_e) { 760 char buf[BUFSIZ]; 761 762 snprintf(buf, sizeof(buf), "%e", 1.5); 763 EXPECT_STREQ("1.500000e+00", buf); 764 765 snprintf(buf, sizeof(buf), "%Le", 1.5L); 766 EXPECT_STREQ("1.500000e+00", buf); 767 } 768 769 TEST(STDIO_TEST, snprintf_negative_zero_5084292) { 770 char buf[BUFSIZ]; 771 772 snprintf(buf, sizeof(buf), "%e", -0.0); 773 EXPECT_STREQ("-0.000000e+00", buf); 774 snprintf(buf, sizeof(buf), "%E", -0.0); 775 EXPECT_STREQ("-0.000000E+00", buf); 776 snprintf(buf, sizeof(buf), "%f", -0.0); 777 EXPECT_STREQ("-0.000000", buf); 778 snprintf(buf, sizeof(buf), "%F", -0.0); 779 EXPECT_STREQ("-0.000000", buf); 780 snprintf(buf, sizeof(buf), "%g", -0.0); 781 EXPECT_STREQ("-0", buf); 782 snprintf(buf, sizeof(buf), "%G", -0.0); 783 EXPECT_STREQ("-0", buf); 784 snprintf(buf, sizeof(buf), "%a", -0.0); 785 EXPECT_STREQ("-0x0p+0", buf); 786 snprintf(buf, sizeof(buf), "%A", -0.0); 787 EXPECT_STREQ("-0X0P+0", buf); 788 } 789 790 TEST(STDIO_TEST, snprintf_utf8_15439554) { 791 locale_t cloc = newlocale(LC_ALL, "C.UTF-8", nullptr); 792 locale_t old_locale = uselocale(cloc); 793 794 // http://b/15439554 795 char buf[BUFSIZ]; 796 797 // 1-byte character. 798 snprintf(buf, sizeof(buf), "%dx%d", 1, 2); 799 EXPECT_STREQ("1x2", buf); 800 // 2-byte character. 801 snprintf(buf, sizeof(buf), "%d\xc2\xa2%d", 1, 2); 802 EXPECT_STREQ("12", buf); 803 // 3-byte character. 804 snprintf(buf, sizeof(buf), "%d\xe2\x82\xac%d", 1, 2); 805 EXPECT_STREQ("12", buf); 806 // 4-byte character. 807 snprintf(buf, sizeof(buf), "%d\xf0\xa4\xad\xa2%d", 1, 2); 808 EXPECT_STREQ("12", buf); 809 810 uselocale(old_locale); 811 freelocale(cloc); 812 } 813 814 static void* snprintf_small_stack_fn(void*) { 815 // Make life (realistically) hard for ourselves by allocating our own buffer for the result. 816 char buf[PATH_MAX]; 817 snprintf(buf, sizeof(buf), "/proc/%d", getpid()); 818 return nullptr; 819 } 820 821 TEST(STDIO_TEST, snprintf_small_stack) { 822 // Is it safe to call snprintf on a thread with a small stack? 823 // (The snprintf implementation puts some pretty large buffers on the stack.) 824 pthread_attr_t a; 825 ASSERT_EQ(0, pthread_attr_init(&a)); 826 ASSERT_EQ(0, pthread_attr_setstacksize(&a, PTHREAD_STACK_MIN)); 827 828 pthread_t t; 829 ASSERT_EQ(0, pthread_create(&t, &a, snprintf_small_stack_fn, nullptr)); 830 ASSERT_EQ(0, pthread_join(t, nullptr)); 831 } 832 833 TEST(STDIO_TEST, snprintf_asterisk_overflow) { 834 char buf[128]; 835 ASSERT_EQ(5, snprintf(buf, sizeof(buf), "%.*s%c", 4, "hello world", '!')); 836 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.*s%c", INT_MAX/2, "hello world", '!')); 837 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.*s%c", INT_MAX-1, "hello world", '!')); 838 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.*s%c", INT_MAX, "hello world", '!')); 839 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.*s%c", -1, "hello world", '!')); 840 841 // INT_MAX-1, INT_MAX, INT_MAX+1. 842 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.2147483646s%c", "hello world", '!')); 843 ASSERT_EQ(12, snprintf(buf, sizeof(buf), "%.2147483647s%c", "hello world", '!')); 844 ASSERT_EQ(-1, snprintf(buf, sizeof(buf), "%.2147483648s%c", "hello world", '!')); 845 ASSERT_EQ(ENOMEM, errno); 846 } 847 848 TEST(STDIO_TEST, fprintf) { 849 TemporaryFile tf; 850 851 FILE* tfile = fdopen(tf.fd, "r+"); 852 ASSERT_TRUE(tfile != nullptr); 853 854 ASSERT_EQ(7, fprintf(tfile, "%d %s", 123, "abc")); 855 AssertFileIs(tfile, "123 abc"); 856 fclose(tfile); 857 } 858 859 TEST(STDIO_TEST, fprintf_failures_7229520) { 860 // http://b/7229520 861 FILE* fp; 862 int fd_rdonly = open("/dev/null", O_RDONLY); 863 ASSERT_NE(-1, fd_rdonly); 864 865 // Unbuffered case where the fprintf(3) itself fails. 866 ASSERT_NE(nullptr, fp = tmpfile()); 867 setbuf(fp, nullptr); 868 ASSERT_EQ(4, fprintf(fp, "epic")); 869 ASSERT_NE(-1, dup2(fd_rdonly, fileno(fp))); 870 ASSERT_EQ(-1, fprintf(fp, "fail")); 871 ASSERT_EQ(0, fclose(fp)); 872 873 // Buffered case where we won't notice until the fclose(3). 874 // It's likely this is what was actually seen in http://b/7229520, 875 // and that expecting fprintf to fail is setting yourself up for 876 // disappointment. Remember to check fclose(3)'s return value, kids! 877 ASSERT_NE(nullptr, fp = tmpfile()); 878 ASSERT_EQ(4, fprintf(fp, "epic")); 879 ASSERT_NE(-1, dup2(fd_rdonly, fileno(fp))); 880 ASSERT_EQ(4, fprintf(fp, "fail")); 881 ASSERT_EQ(-1, fclose(fp)); 882 } 883 884 TEST(STDIO_TEST, popen_r) { 885 FILE* fp = popen("cat /proc/version", "r"); 886 ASSERT_TRUE(fp != nullptr); 887 888 char buf[16]; 889 char* s = fgets(buf, sizeof(buf), fp); 890 buf[13] = '\0'; 891 ASSERT_STREQ("Linux version", s); 892 893 ASSERT_EQ(0, pclose(fp)); 894 } 895 896 TEST(STDIO_TEST, popen_socketpair) { 897 FILE* fp = popen("cat", "r+"); 898 ASSERT_TRUE(fp != nullptr); 899 900 fputs("hello\nworld\n", fp); 901 fflush(fp); 902 903 char buf[16]; 904 ASSERT_NE(nullptr, fgets(buf, sizeof(buf), fp)); 905 EXPECT_STREQ("hello\n", buf); 906 ASSERT_NE(nullptr, fgets(buf, sizeof(buf), fp)); 907 EXPECT_STREQ("world\n", buf); 908 909 ASSERT_EQ(0, pclose(fp)); 910 } 911 912 TEST(STDIO_TEST, popen_socketpair_shutdown) { 913 FILE* fp = popen("uniq -c", "r+"); 914 ASSERT_TRUE(fp != nullptr); 915 916 fputs("a\na\na\na\nb\n", fp); 917 fflush(fp); 918 ASSERT_EQ(0, shutdown(fileno(fp), SHUT_WR)); 919 920 char buf[16]; 921 ASSERT_NE(nullptr, fgets(buf, sizeof(buf), fp)); 922 EXPECT_STREQ(" 4 a\n", buf); 923 ASSERT_NE(nullptr, fgets(buf, sizeof(buf), fp)); 924 EXPECT_STREQ(" 1 b\n", buf); 925 926 ASSERT_EQ(0, pclose(fp)); 927 } 928 929 TEST(STDIO_TEST, popen_return_value_0) { 930 FILE* fp = popen("true", "r"); 931 ASSERT_TRUE(fp != nullptr); 932 int status = pclose(fp); 933 EXPECT_TRUE(WIFEXITED(status)); 934 EXPECT_EQ(0, WEXITSTATUS(status)); 935 } 936 937 TEST(STDIO_TEST, popen_return_value_1) { 938 FILE* fp = popen("false", "r"); 939 ASSERT_TRUE(fp != nullptr); 940 int status = pclose(fp); 941 EXPECT_TRUE(WIFEXITED(status)); 942 EXPECT_EQ(1, WEXITSTATUS(status)); 943 } 944 945 TEST(STDIO_TEST, popen_return_value_signal) { 946 FILE* fp = popen("kill -7 $$", "r"); 947 ASSERT_TRUE(fp != nullptr); 948 int status = pclose(fp); 949 EXPECT_TRUE(WIFSIGNALED(status)); 950 EXPECT_EQ(7, WTERMSIG(status)); 951 } 952 953 TEST(STDIO_TEST, getc) { 954 FILE* fp = fopen("/proc/version", "r"); 955 ASSERT_TRUE(fp != nullptr); 956 ASSERT_EQ('L', getc(fp)); 957 ASSERT_EQ('i', getc(fp)); 958 ASSERT_EQ('n', getc(fp)); 959 ASSERT_EQ('u', getc(fp)); 960 ASSERT_EQ('x', getc(fp)); 961 fclose(fp); 962 } 963 964 TEST(STDIO_TEST, putc) { 965 FILE* fp = fopen("/proc/version", "r"); 966 ASSERT_TRUE(fp != nullptr); 967 ASSERT_EQ(EOF, putc('x', fp)); 968 fclose(fp); 969 } 970 971 TEST(STDIO_TEST, sscanf_swscanf) { 972 struct stuff { 973 char s1[123]; 974 int i1, i2; 975 char cs1[3]; 976 char s2[3]; 977 char c1; 978 double d1; 979 float f1; 980 char s3[123]; 981 982 void Check() { 983 EXPECT_STREQ("hello", s1); 984 EXPECT_EQ(123, i1); 985 EXPECT_EQ(456, i2); 986 EXPECT_EQ('a', cs1[0]); 987 EXPECT_EQ('b', cs1[1]); 988 EXPECT_EQ('x', cs1[2]); // No terminating NUL. 989 EXPECT_STREQ("AB", s2); // Terminating NUL. 990 EXPECT_EQ('!', c1); 991 EXPECT_DOUBLE_EQ(1.23, d1); 992 EXPECT_FLOAT_EQ(9.0f, f1); 993 EXPECT_STREQ("world", s3); 994 } 995 } s; 996 997 memset(&s, 'x', sizeof(s)); 998 ASSERT_EQ(9, sscanf(" hello 123 456abAB! 1.23 0x1.2p3 world", 999 "%s %i%i%2c%[A-Z]%c %lf %f %s", 1000 s.s1, &s.i1, &s.i2, s.cs1, s.s2, &s.c1, &s.d1, &s.f1, s.s3)); 1001 s.Check(); 1002 1003 memset(&s, 'x', sizeof(s)); 1004 ASSERT_EQ(9, swscanf(L" hello 123 456abAB! 1.23 0x1.2p3 world", 1005 L"%s %i%i%2c%[A-Z]%c %lf %f %s", 1006 s.s1, &s.i1, &s.i2, s.cs1, s.s2, &s.c1, &s.d1, &s.f1, s.s3)); 1007 s.Check(); 1008 } 1009 1010 template <typename T> 1011 static void CheckScanf(int sscanf_fn(const T*, const T*, ...), 1012 const T* input, const T* fmt, 1013 int expected_count, const char* expected_string) { 1014 char buf[256] = {}; 1015 ASSERT_EQ(expected_count, sscanf_fn(input, fmt, &buf)) << fmt; 1016 ASSERT_STREQ(expected_string, buf) << fmt; 1017 } 1018 1019 TEST(STDIO_TEST, sscanf_ccl) { 1020 // `abc` is just those characters. 1021 CheckScanf(sscanf, "abcd", "%[abc]", 1, "abc"); 1022 // `a-c` is the range 'a' .. 'c'. 1023 CheckScanf(sscanf, "abcd", "%[a-c]", 1, "abc"); 1024 CheckScanf(sscanf, "-d", "%[a-c]", 0, ""); 1025 CheckScanf(sscanf, "ac-bAd", "%[a--c]", 1, "ac-bA"); 1026 // `a-c-e` is equivalent to `a-e`. 1027 CheckScanf(sscanf, "abcdefg", "%[a-c-e]", 1, "abcde"); 1028 // `e-a` is equivalent to `ae-` (because 'e' > 'a'). 1029 CheckScanf(sscanf, "-a-e-b", "%[e-a]", 1, "-a-e-"); 1030 // An initial '^' negates the set. 1031 CheckScanf(sscanf, "abcde", "%[^d]", 1, "abc"); 1032 CheckScanf(sscanf, "abcdefgh", "%[^c-d]", 1, "ab"); 1033 CheckScanf(sscanf, "hgfedcba", "%[^c-d]", 1, "hgfe"); 1034 // The first character may be ']' or '-' without being special. 1035 CheckScanf(sscanf, "[[]]x", "%[][]", 1, "[[]]"); 1036 CheckScanf(sscanf, "-a-x", "%[-a]", 1, "-a-"); 1037 // The last character may be '-' without being special. 1038 CheckScanf(sscanf, "-a-x", "%[a-]", 1, "-a-"); 1039 // X--Y is [X--] + Y, not [X--] + [--Y] (a bug in my initial implementation). 1040 CheckScanf(sscanf, "+,-/.", "%[+--/]", 1, "+,-/"); 1041 } 1042 1043 TEST(STDIO_TEST, swscanf_ccl) { 1044 // `abc` is just those characters. 1045 CheckScanf(swscanf, L"abcd", L"%[abc]", 1, "abc"); 1046 // `a-c` is the range 'a' .. 'c'. 1047 CheckScanf(swscanf, L"abcd", L"%[a-c]", 1, "abc"); 1048 CheckScanf(swscanf, L"-d", L"%[a-c]", 0, ""); 1049 CheckScanf(swscanf, L"ac-bAd", L"%[a--c]", 1, "ac-bA"); 1050 // `a-c-e` is equivalent to `a-e`. 1051 CheckScanf(swscanf, L"abcdefg", L"%[a-c-e]", 1, "abcde"); 1052 // `e-a` is equivalent to `ae-` (because 'e' > 'a'). 1053 CheckScanf(swscanf, L"-a-e-b", L"%[e-a]", 1, "-a-e-"); 1054 // An initial '^' negates the set. 1055 CheckScanf(swscanf, L"abcde", L"%[^d]", 1, "abc"); 1056 CheckScanf(swscanf, L"abcdefgh", L"%[^c-d]", 1, "ab"); 1057 CheckScanf(swscanf, L"hgfedcba", L"%[^c-d]", 1, "hgfe"); 1058 // The first character may be ']' or '-' without being special. 1059 CheckScanf(swscanf, L"[[]]x", L"%[][]", 1, "[[]]"); 1060 CheckScanf(swscanf, L"-a-x", L"%[-a]", 1, "-a-"); 1061 // The last character may be '-' without being special. 1062 CheckScanf(swscanf, L"-a-x", L"%[a-]", 1, "-a-"); 1063 // X--Y is [X--] + Y, not [X--] + [--Y] (a bug in my initial implementation). 1064 CheckScanf(swscanf, L"+,-/.", L"%[+--/]", 1, "+,-/"); 1065 } 1066 1067 template <typename T1, typename T2> 1068 static void CheckScanfM(int sscanf_fn(const T1*, const T1*, ...), 1069 const T1* input, const T1* fmt, 1070 int expected_count, const T2* expected_string) { 1071 T2* result = nullptr; 1072 ASSERT_EQ(expected_count, sscanf_fn(input, fmt, &result)) << fmt; 1073 if (expected_string == nullptr) { 1074 ASSERT_EQ(nullptr, result); 1075 } else { 1076 ASSERT_STREQ(expected_string, result) << fmt; 1077 } 1078 free(result); 1079 } 1080 1081 TEST(STDIO_TEST, sscanf_mc) { 1082 char* p1 = nullptr; 1083 char* p2 = nullptr; 1084 ASSERT_EQ(2, sscanf("hello", "%mc%mc", &p1, &p2)); 1085 ASSERT_EQ('h', *p1); 1086 ASSERT_EQ('e', *p2); 1087 free(p1); 1088 free(p2); 1089 1090 p1 = nullptr; 1091 ASSERT_EQ(1, sscanf("hello", "%4mc", &p1)); 1092 ASSERT_EQ('h', p1[0]); 1093 ASSERT_EQ('e', p1[1]); 1094 ASSERT_EQ('l', p1[2]); 1095 ASSERT_EQ('l', p1[3]); 1096 free(p1); 1097 1098 p1 = nullptr; 1099 ASSERT_EQ(1, sscanf("hello world", "%30mc", &p1)); 1100 ASSERT_EQ('h', p1[0]); 1101 ASSERT_EQ('e', p1[1]); 1102 ASSERT_EQ('l', p1[2]); 1103 ASSERT_EQ('l', p1[3]); 1104 ASSERT_EQ('o', p1[4]); 1105 free(p1); 1106 } 1107 1108 1109 TEST(STDIO_TEST, sscanf_mlc) { 1110 // This is so useless that clang doesn't even believe it exists... 1111 #pragma clang diagnostic push 1112 #pragma clang diagnostic ignored "-Wformat-invalid-specifier" 1113 #pragma clang diagnostic ignored "-Wformat-extra-args" 1114 1115 wchar_t* p1 = nullptr; 1116 wchar_t* p2 = nullptr; 1117 ASSERT_EQ(2, sscanf("hello", "%mlc%mlc", &p1, &p2)); 1118 ASSERT_EQ(L'h', *p1); 1119 ASSERT_EQ(L'e', *p2); 1120 free(p1); 1121 free(p2); 1122 1123 p1 = nullptr; 1124 ASSERT_EQ(1, sscanf("hello", "%4mlc", &p1)); 1125 ASSERT_EQ(L'h', p1[0]); 1126 ASSERT_EQ(L'e', p1[1]); 1127 ASSERT_EQ(L'l', p1[2]); 1128 ASSERT_EQ(L'l', p1[3]); 1129 free(p1); 1130 1131 p1 = nullptr; 1132 ASSERT_EQ(1, sscanf("hello world", "%30mlc", &p1)); 1133 ASSERT_EQ(L'h', p1[0]); 1134 ASSERT_EQ(L'e', p1[1]); 1135 ASSERT_EQ(L'l', p1[2]); 1136 ASSERT_EQ(L'l', p1[3]); 1137 ASSERT_EQ(L'o', p1[4]); 1138 free(p1); 1139 #pragma clang diagnostic pop 1140 } 1141 1142 1143 TEST(STDIO_TEST, sscanf_ms) { 1144 CheckScanfM(sscanf, "hello", "%ms", 1, "hello"); 1145 CheckScanfM(sscanf, "hello", "%4ms", 1, "hell"); 1146 CheckScanfM(sscanf, "hello world", "%30ms", 1, "hello"); 1147 } 1148 1149 TEST(STDIO_TEST, sscanf_mls) { 1150 CheckScanfM(sscanf, "hello", "%mls", 1, L"hello"); 1151 CheckScanfM(sscanf, "hello", "%4mls", 1, L"hell"); 1152 CheckScanfM(sscanf, "hello world", "%30mls", 1, L"hello"); 1153 } 1154 1155 TEST(STDIO_TEST, sscanf_m_ccl) { 1156 CheckScanfM(sscanf, "hello", "%m[a-z]", 1, "hello"); 1157 CheckScanfM(sscanf, "hello", "%4m[a-z]", 1, "hell"); 1158 CheckScanfM(sscanf, "hello world", "%30m[a-z]", 1, "hello"); 1159 } 1160 1161 TEST(STDIO_TEST, sscanf_ml_ccl) { 1162 CheckScanfM(sscanf, "hello", "%ml[a-z]", 1, L"hello"); 1163 CheckScanfM(sscanf, "hello", "%4ml[a-z]", 1, L"hell"); 1164 CheckScanfM(sscanf, "hello world", "%30ml[a-z]", 1, L"hello"); 1165 } 1166 1167 TEST(STDIO_TEST, sscanf_ls) { 1168 wchar_t w[32] = {}; 1169 ASSERT_EQ(1, sscanf("hello world", "%ls", w)); 1170 ASSERT_EQ(L"hello", std::wstring(w)); 1171 } 1172 1173 TEST(STDIO_TEST, sscanf_ls_suppress) { 1174 ASSERT_EQ(0, sscanf("hello world", "%*ls %*ls")); 1175 } 1176 1177 TEST(STDIO_TEST, sscanf_ls_n) { 1178 setlocale(LC_ALL, "C.UTF-8"); 1179 wchar_t w[32] = {}; 1180 int pos = 0; 1181 ASSERT_EQ(1, sscanf("\xc4\x80", "%ls%n", w, &pos)); 1182 ASSERT_EQ(static_cast<wchar_t>(256), w[0]); 1183 ASSERT_EQ(2, pos); 1184 } 1185 1186 TEST(STDIO_TEST, sscanf_ls_realloc) { 1187 // This is so useless that clang doesn't even believe it exists... 1188 #pragma clang diagnostic push 1189 #pragma clang diagnostic ignored "-Wformat-invalid-specifier" 1190 #pragma clang diagnostic ignored "-Wformat-extra-args" 1191 wchar_t* p1 = nullptr; 1192 wchar_t* p2 = nullptr; 1193 ASSERT_EQ(2, sscanf("1234567890123456789012345678901234567890 world", "%mls %mls", &p1, &p2)); 1194 ASSERT_EQ(L"1234567890123456789012345678901234567890", std::wstring(p1)); 1195 ASSERT_EQ(L"world", std::wstring(p2)); 1196 #pragma clang diagnostic pop 1197 } 1198 1199 // https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202240 1200 TEST(STDIO_TEST, scanf_wscanf_EOF) { 1201 EXPECT_EQ(0, sscanf("b", "ab")); 1202 EXPECT_EQ(EOF, sscanf("", "a")); 1203 EXPECT_EQ(0, swscanf(L"b", L"ab")); 1204 EXPECT_EQ(EOF, swscanf(L"", L"a")); 1205 } 1206 1207 TEST(STDIO_TEST, scanf_invalid_UTF8) { 1208 #if 0 // TODO: more tests invented during code review; no regressions, so fix later. 1209 char buf[BUFSIZ]; 1210 wchar_t wbuf[BUFSIZ]; 1211 1212 memset(buf, 0, sizeof(buf)); 1213 memset(wbuf, 0, sizeof(wbuf)); 1214 EXPECT_EQ(0, sscanf("\xc0" " foo", "%ls %s", wbuf, buf)); 1215 #endif 1216 } 1217 1218 TEST(STDIO_TEST, scanf_no_match_no_termination) { 1219 char buf[4] = "x"; 1220 EXPECT_EQ(0, sscanf("d", "%[abc]", buf)); 1221 EXPECT_EQ('x', buf[0]); 1222 EXPECT_EQ(0, swscanf(L"d", L"%[abc]", buf)); 1223 EXPECT_EQ('x', buf[0]); 1224 1225 wchar_t wbuf[4] = L"x"; 1226 EXPECT_EQ(0, swscanf(L"d", L"%l[abc]", wbuf)); 1227 EXPECT_EQ(L'x', wbuf[0]); 1228 1229 EXPECT_EQ(EOF, sscanf("", "%s", buf)); 1230 EXPECT_EQ('x', buf[0]); 1231 1232 EXPECT_EQ(EOF, swscanf(L"", L"%ls", wbuf)); 1233 EXPECT_EQ(L'x', wbuf[0]); 1234 } 1235 1236 TEST(STDIO_TEST, scanf_wscanf_wide_character_class) { 1237 #if 0 // TODO: more tests invented during code review; no regressions, so fix later. 1238 wchar_t buf[BUFSIZ]; 1239 1240 // A wide character shouldn't match an ASCII-only class for scanf or wscanf. 1241 memset(buf, 0, sizeof(buf)); 1242 EXPECT_EQ(1, sscanf("xyz", "%l[xy]", buf)); 1243 EXPECT_EQ(L"x"s, std::wstring(buf)); 1244 memset(buf, 0, sizeof(buf)); 1245 EXPECT_EQ(1, swscanf(L"xyz", L"%l[xy]", buf)); 1246 EXPECT_EQ(L"x"s, std::wstring(buf)); 1247 1248 // Even if scanf has wide characters in a class, they won't match... 1249 // TODO: is that a bug? 1250 memset(buf, 0, sizeof(buf)); 1251 EXPECT_EQ(1, sscanf("xyz", "%l[xy]", buf)); 1252 EXPECT_EQ(L"x"s, std::wstring(buf)); 1253 // ...unless you use wscanf. 1254 memset(buf, 0, sizeof(buf)); 1255 EXPECT_EQ(1, swscanf(L"xyz", L"%l[xy]", buf)); 1256 EXPECT_EQ(L"xy"s, std::wstring(buf)); 1257 1258 // Negation only covers ASCII for scanf... 1259 memset(buf, 0, sizeof(buf)); 1260 EXPECT_EQ(1, sscanf("xyz", "%l[^ab]", buf)); 1261 EXPECT_EQ(L"x"s, std::wstring(buf)); 1262 // ...but covers wide characters for wscanf. 1263 memset(buf, 0, sizeof(buf)); 1264 EXPECT_EQ(1, swscanf(L"xyz", L"%l[^ab]", buf)); 1265 EXPECT_EQ(L"xyz"s, std::wstring(buf)); 1266 1267 // We already determined that non-ASCII characters are ignored in scanf classes. 1268 memset(buf, 0, sizeof(buf)); 1269 EXPECT_EQ(1, sscanf("x" 1270 "\xc4\x80" // Matches a byte from each wide char in the class. 1271 "\xc6\x82" // Neither byte is in the class. 1272 "yz", 1273 "%l[xy" "\xc5\x80" "\xc4\x81" "]", buf)); 1274 EXPECT_EQ(L"x", std::wstring(buf)); 1275 // bionic and glibc both behave badly for wscanf, so let's call it right for now... 1276 memset(buf, 0, sizeof(buf)); 1277 EXPECT_EQ(1, swscanf(L"x" 1278 L"\xc4\x80" 1279 L"\xc6\x82" 1280 L"yz", 1281 L"%l[xy" L"\xc5\x80" L"\xc4\x81" L"]", buf)); 1282 // Note that this isn't L"x" --- although the *bytes* matched, they're 1283 // not put back together as a wide character. 1284 EXPECT_EQ(L"x" L"\xc4" L"\x80", std::wstring(buf)); 1285 #endif 1286 } 1287 1288 TEST(STDIO_TEST, cantwrite_EBADF) { 1289 // If we open a file read-only... 1290 FILE* fp = fopen("/proc/version", "r"); 1291 1292 // ...all attempts to write to that file should return failure. 1293 1294 // They should also set errno to EBADF. This isn't POSIX, but it's traditional. 1295 // glibc gets the wide-character functions wrong. 1296 1297 errno = 0; 1298 EXPECT_EQ(EOF, putc('x', fp)); 1299 EXPECT_EQ(EBADF, errno); 1300 1301 errno = 0; 1302 EXPECT_EQ(EOF, fprintf(fp, "hello")); 1303 EXPECT_EQ(EBADF, errno); 1304 1305 errno = 0; 1306 EXPECT_EQ(EOF, fwprintf(fp, L"hello")); 1307 #if defined(__BIONIC__) 1308 EXPECT_EQ(EBADF, errno); 1309 #endif 1310 1311 errno = 0; 1312 EXPECT_EQ(0U, fwrite("hello", 1, 2, fp)); 1313 EXPECT_EQ(EBADF, errno); 1314 1315 errno = 0; 1316 EXPECT_EQ(EOF, fputs("hello", fp)); 1317 EXPECT_EQ(EBADF, errno); 1318 1319 errno = 0; 1320 EXPECT_EQ(WEOF, fputwc(L'x', fp)); 1321 #if defined(__BIONIC__) 1322 EXPECT_EQ(EBADF, errno); 1323 #endif 1324 } 1325 1326 // Tests that we can only have a consistent and correct fpos_t when using 1327 // f*pos functions (i.e. fpos doesn't get inside a multi byte character). 1328 TEST(STDIO_TEST, consistent_fpos_t) { 1329 ASSERT_STREQ("C.UTF-8", setlocale(LC_CTYPE, "C.UTF-8")); 1330 uselocale(LC_GLOBAL_LOCALE); 1331 1332 FILE* fp = tmpfile(); 1333 ASSERT_TRUE(fp != nullptr); 1334 1335 wchar_t mb_one_bytes = L'h'; 1336 wchar_t mb_two_bytes = 0x00a2; 1337 wchar_t mb_three_bytes = 0x20ac; 1338 wchar_t mb_four_bytes = 0x24b62; 1339 1340 // Write to file. 1341 ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fputwc(mb_one_bytes, fp))); 1342 ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fputwc(mb_two_bytes, fp))); 1343 ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fputwc(mb_three_bytes, fp))); 1344 ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fputwc(mb_four_bytes, fp))); 1345 1346 rewind(fp); 1347 1348 // Record each character position. 1349 fpos_t pos1; 1350 fpos_t pos2; 1351 fpos_t pos3; 1352 fpos_t pos4; 1353 fpos_t pos5; 1354 EXPECT_EQ(0, fgetpos(fp, &pos1)); 1355 ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fgetwc(fp))); 1356 EXPECT_EQ(0, fgetpos(fp, &pos2)); 1357 ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp))); 1358 EXPECT_EQ(0, fgetpos(fp, &pos3)); 1359 ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fgetwc(fp))); 1360 EXPECT_EQ(0, fgetpos(fp, &pos4)); 1361 ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fgetwc(fp))); 1362 EXPECT_EQ(0, fgetpos(fp, &pos5)); 1363 1364 #if defined(__BIONIC__) 1365 // Bionic's fpos_t is just an alias for off_t. This is inherited from OpenBSD 1366 // upstream. Glibc differs by storing the mbstate_t inside its fpos_t. In 1367 // Bionic (and upstream OpenBSD) the mbstate_t is stored inside the FILE 1368 // structure. 1369 ASSERT_EQ(0, static_cast<off_t>(pos1)); 1370 ASSERT_EQ(1, static_cast<off_t>(pos2)); 1371 ASSERT_EQ(3, static_cast<off_t>(pos3)); 1372 ASSERT_EQ(6, static_cast<off_t>(pos4)); 1373 ASSERT_EQ(10, static_cast<off_t>(pos5)); 1374 #endif 1375 1376 // Exercise back and forth movements of the position. 1377 ASSERT_EQ(0, fsetpos(fp, &pos2)); 1378 ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp))); 1379 ASSERT_EQ(0, fsetpos(fp, &pos1)); 1380 ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fgetwc(fp))); 1381 ASSERT_EQ(0, fsetpos(fp, &pos4)); 1382 ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fgetwc(fp))); 1383 ASSERT_EQ(0, fsetpos(fp, &pos3)); 1384 ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fgetwc(fp))); 1385 ASSERT_EQ(0, fsetpos(fp, &pos5)); 1386 ASSERT_EQ(WEOF, fgetwc(fp)); 1387 1388 fclose(fp); 1389 } 1390 1391 // Exercise the interaction between fpos and seek. 1392 TEST(STDIO_TEST, fpos_t_and_seek) { 1393 ASSERT_STREQ("C.UTF-8", setlocale(LC_CTYPE, "C.UTF-8")); 1394 uselocale(LC_GLOBAL_LOCALE); 1395 1396 // In glibc-2.16 fseek doesn't work properly in wide mode 1397 // (https://sourceware.org/bugzilla/show_bug.cgi?id=14543). One workaround is 1398 // to close and re-open the file. We do it in order to make the test pass 1399 // with all glibcs. 1400 1401 TemporaryFile tf; 1402 FILE* fp = fdopen(tf.fd, "w+"); 1403 ASSERT_TRUE(fp != nullptr); 1404 1405 wchar_t mb_two_bytes = 0x00a2; 1406 wchar_t mb_three_bytes = 0x20ac; 1407 wchar_t mb_four_bytes = 0x24b62; 1408 1409 // Write to file. 1410 ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fputwc(mb_two_bytes, fp))); 1411 ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fputwc(mb_three_bytes, fp))); 1412 ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fputwc(mb_four_bytes, fp))); 1413 1414 fflush(fp); 1415 fclose(fp); 1416 1417 fp = fopen(tf.path, "r"); 1418 ASSERT_TRUE(fp != nullptr); 1419 1420 // Store a valid position. 1421 fpos_t mb_two_bytes_pos; 1422 ASSERT_EQ(0, fgetpos(fp, &mb_two_bytes_pos)); 1423 1424 // Move inside mb_four_bytes with fseek. 1425 long offset_inside_mb = 6; 1426 ASSERT_EQ(0, fseek(fp, offset_inside_mb, SEEK_SET)); 1427 1428 // Store the "inside multi byte" position. 1429 fpos_t pos_inside_mb; 1430 ASSERT_EQ(0, fgetpos(fp, &pos_inside_mb)); 1431 #if defined(__BIONIC__) 1432 ASSERT_EQ(offset_inside_mb, static_cast<off_t>(pos_inside_mb)); 1433 #endif 1434 1435 // Reading from within a byte should produce an error. 1436 ASSERT_EQ(WEOF, fgetwc(fp)); 1437 ASSERT_EQ(EILSEQ, errno); 1438 1439 // Reverting to a valid position should work. 1440 ASSERT_EQ(0, fsetpos(fp, &mb_two_bytes_pos)); 1441 ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp))); 1442 1443 // Moving withing a multi byte with fsetpos should work but reading should 1444 // produce an error. 1445 ASSERT_EQ(0, fsetpos(fp, &pos_inside_mb)); 1446 ASSERT_EQ(WEOF, fgetwc(fp)); 1447 ASSERT_EQ(EILSEQ, errno); 1448 1449 ASSERT_EQ(0, fclose(fp)); 1450 } 1451 1452 TEST(STDIO_TEST, fmemopen) { 1453 char buf[16]; 1454 memset(buf, 0, sizeof(buf)); 1455 FILE* fp = fmemopen(buf, sizeof(buf), "r+"); 1456 ASSERT_EQ('<', fputc('<', fp)); 1457 ASSERT_NE(EOF, fputs("abc>\n", fp)); 1458 fflush(fp); 1459 1460 // We wrote to the buffer... 1461 ASSERT_STREQ("<abc>\n", buf); 1462 1463 // And can read back from the file. 1464 AssertFileIs(fp, "<abc>\n", true); 1465 ASSERT_EQ(0, fclose(fp)); 1466 } 1467 1468 TEST(STDIO_TEST, fmemopen_nullptr) { 1469 FILE* fp = fmemopen(nullptr, 128, "r+"); 1470 ASSERT_NE(EOF, fputs("xyz\n", fp)); 1471 1472 AssertFileIs(fp, "xyz\n", true); 1473 ASSERT_EQ(0, fclose(fp)); 1474 } 1475 1476 TEST(STDIO_TEST, fmemopen_trailing_NUL_byte) { 1477 FILE* fp; 1478 char buf[8]; 1479 1480 // POSIX: "When a stream open for writing is flushed or closed, a null byte 1481 // shall be written at the current position or at the end of the buffer, 1482 // depending on the size of the contents." 1483 memset(buf, 'x', sizeof(buf)); 1484 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "w")); 1485 // Even with nothing written (and not in truncate mode), we'll flush a NUL... 1486 ASSERT_EQ(0, fflush(fp)); 1487 EXPECT_EQ("\0xxxxxxx"s, std::string(buf, buf + sizeof(buf))); 1488 // Now write and check that the NUL moves along with our writes... 1489 ASSERT_NE(EOF, fputs("hello", fp)); 1490 ASSERT_EQ(0, fflush(fp)); 1491 EXPECT_EQ("hello\0xx"s, std::string(buf, buf + sizeof(buf))); 1492 ASSERT_NE(EOF, fputs("wo", fp)); 1493 ASSERT_EQ(0, fflush(fp)); 1494 EXPECT_EQ("hellowo\0"s, std::string(buf, buf + sizeof(buf))); 1495 ASSERT_EQ(0, fclose(fp)); 1496 1497 // "If a stream open for update is flushed or closed and the last write has 1498 // advanced the current buffer size, a null byte shall be written at the end 1499 // of the buffer if it fits." 1500 memset(buf, 'x', sizeof(buf)); 1501 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "r+")); 1502 // Nothing written yet, so no advance... 1503 ASSERT_EQ(0, fflush(fp)); 1504 EXPECT_EQ("xxxxxxxx"s, std::string(buf, buf + sizeof(buf))); 1505 ASSERT_NE(EOF, fputs("hello", fp)); 1506 ASSERT_EQ(0, fclose(fp)); 1507 } 1508 1509 TEST(STDIO_TEST, fmemopen_size) { 1510 FILE* fp; 1511 char buf[16]; 1512 memset(buf, 'x', sizeof(buf)); 1513 1514 // POSIX: "The stream shall also maintain the size of the current buffer 1515 // contents; use of fseek() or fseeko() on the stream with SEEK_END shall 1516 // seek relative to this size." 1517 1518 // "For modes r and r+ the size shall be set to the value given by the size 1519 // argument." 1520 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "r")); 1521 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1522 EXPECT_EQ(16, ftell(fp)); 1523 EXPECT_EQ(16, ftello(fp)); 1524 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1525 EXPECT_EQ(16, ftell(fp)); 1526 EXPECT_EQ(16, ftello(fp)); 1527 ASSERT_EQ(0, fclose(fp)); 1528 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "r+")); 1529 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1530 EXPECT_EQ(16, ftell(fp)); 1531 EXPECT_EQ(16, ftello(fp)); 1532 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1533 EXPECT_EQ(16, ftell(fp)); 1534 EXPECT_EQ(16, ftello(fp)); 1535 ASSERT_EQ(0, fclose(fp)); 1536 1537 // "For modes w and w+ the initial size shall be zero..." 1538 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "w")); 1539 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1540 EXPECT_EQ(0, ftell(fp)); 1541 EXPECT_EQ(0, ftello(fp)); 1542 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1543 EXPECT_EQ(0, ftell(fp)); 1544 EXPECT_EQ(0, ftello(fp)); 1545 ASSERT_EQ(0, fclose(fp)); 1546 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "w+")); 1547 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1548 EXPECT_EQ(0, ftell(fp)); 1549 EXPECT_EQ(0, ftello(fp)); 1550 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1551 EXPECT_EQ(0, ftell(fp)); 1552 EXPECT_EQ(0, ftello(fp)); 1553 ASSERT_EQ(0, fclose(fp)); 1554 1555 // "...and for modes a and a+ the initial size shall be: 1556 // 1. Zero, if buf is a null pointer 1557 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "a")); 1558 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1559 EXPECT_EQ(0, ftell(fp)); 1560 EXPECT_EQ(0, ftello(fp)); 1561 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1562 EXPECT_EQ(0, ftell(fp)); 1563 EXPECT_EQ(0, ftello(fp)); 1564 ASSERT_EQ(0, fclose(fp)); 1565 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "a+")); 1566 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1567 EXPECT_EQ(0, ftell(fp)); 1568 EXPECT_EQ(0, ftello(fp)); 1569 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1570 EXPECT_EQ(0, ftell(fp)); 1571 EXPECT_EQ(0, ftello(fp)); 1572 ASSERT_EQ(0, fclose(fp)); 1573 1574 // 2. The position of the first null byte in the buffer, if one is found 1575 memset(buf, 'x', sizeof(buf)); 1576 buf[3] = '\0'; 1577 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "a")); 1578 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1579 EXPECT_EQ(3, ftell(fp)); 1580 EXPECT_EQ(3, ftello(fp)); 1581 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1582 EXPECT_EQ(3, ftell(fp)); 1583 EXPECT_EQ(3, ftello(fp)); 1584 ASSERT_EQ(0, fclose(fp)); 1585 memset(buf, 'x', sizeof(buf)); 1586 buf[3] = '\0'; 1587 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "a+")); 1588 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1589 EXPECT_EQ(3, ftell(fp)); 1590 EXPECT_EQ(3, ftello(fp)); 1591 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1592 EXPECT_EQ(3, ftell(fp)); 1593 EXPECT_EQ(3, ftello(fp)); 1594 ASSERT_EQ(0, fclose(fp)); 1595 1596 // 3. The value of the size argument, if buf is not a null pointer and no 1597 // null byte is found. 1598 memset(buf, 'x', sizeof(buf)); 1599 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "a")); 1600 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1601 EXPECT_EQ(16, ftell(fp)); 1602 EXPECT_EQ(16, ftello(fp)); 1603 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1604 EXPECT_EQ(16, ftell(fp)); 1605 EXPECT_EQ(16, ftello(fp)); 1606 ASSERT_EQ(0, fclose(fp)); 1607 memset(buf, 'x', sizeof(buf)); 1608 ASSERT_NE(nullptr, fp = fmemopen(buf, 16, "a+")); 1609 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1610 EXPECT_EQ(16, ftell(fp)); 1611 EXPECT_EQ(16, ftello(fp)); 1612 ASSERT_EQ(0, fseeko(fp, 0, SEEK_END)); 1613 EXPECT_EQ(16, ftell(fp)); 1614 EXPECT_EQ(16, ftello(fp)); 1615 ASSERT_EQ(0, fclose(fp)); 1616 } 1617 1618 TEST(STDIO_TEST, fmemopen_SEEK_END) { 1619 // fseek SEEK_END is relative to the current string length, not the buffer size. 1620 FILE* fp; 1621 char buf[8]; 1622 memset(buf, 'x', sizeof(buf)); 1623 strcpy(buf, "str"); 1624 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "w+")); 1625 ASSERT_NE(EOF, fputs("string", fp)); 1626 EXPECT_EQ(0, fseek(fp, 0, SEEK_END)); 1627 EXPECT_EQ(static_cast<long>(strlen("string")), ftell(fp)); 1628 EXPECT_EQ(static_cast<off_t>(strlen("string")), ftello(fp)); 1629 EXPECT_EQ(0, fclose(fp)); 1630 1631 // glibc < 2.22 interpreted SEEK_END the wrong way round (subtracting rather 1632 // than adding). 1633 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "w+")); 1634 ASSERT_NE(EOF, fputs("54321", fp)); 1635 EXPECT_EQ(0, fseek(fp, -2, SEEK_END)); 1636 EXPECT_EQ('2', fgetc(fp)); 1637 EXPECT_EQ(0, fclose(fp)); 1638 } 1639 1640 TEST(STDIO_TEST, fmemopen_seek_invalid) { 1641 char buf[8]; 1642 memset(buf, 'x', sizeof(buf)); 1643 FILE* fp = fmemopen(buf, sizeof(buf), "w"); 1644 ASSERT_TRUE(fp != nullptr); 1645 1646 // POSIX: "An attempt to seek ... to a negative position or to a position 1647 // larger than the buffer size given in the size argument shall fail." 1648 // (There's no mention of what errno should be set to, and glibc doesn't 1649 // set errno in any of these cases.) 1650 EXPECT_EQ(-1, fseek(fp, -2, SEEK_SET)); 1651 EXPECT_EQ(-1, fseeko(fp, -2, SEEK_SET)); 1652 EXPECT_EQ(-1, fseek(fp, sizeof(buf) + 1, SEEK_SET)); 1653 EXPECT_EQ(-1, fseeko(fp, sizeof(buf) + 1, SEEK_SET)); 1654 } 1655 1656 TEST(STDIO_TEST, fmemopen_read_EOF) { 1657 // POSIX: "A read operation on the stream shall not advance the current 1658 // buffer position beyond the current buffer size." 1659 char buf[8]; 1660 memset(buf, 'x', sizeof(buf)); 1661 FILE* fp = fmemopen(buf, sizeof(buf), "r"); 1662 ASSERT_TRUE(fp != nullptr); 1663 char buf2[BUFSIZ]; 1664 ASSERT_EQ(8U, fread(buf2, 1, sizeof(buf2), fp)); 1665 // POSIX: "Reaching the buffer size in a read operation shall count as 1666 // end-of-file. 1667 ASSERT_TRUE(feof(fp)); 1668 ASSERT_EQ(EOF, fgetc(fp)); 1669 ASSERT_EQ(0, fclose(fp)); 1670 } 1671 1672 TEST(STDIO_TEST, fmemopen_read_null_bytes) { 1673 // POSIX: "Null bytes in the buffer shall have no special meaning for reads." 1674 char buf[] = "h\0e\0l\0l\0o"; 1675 FILE* fp = fmemopen(buf, sizeof(buf), "r"); 1676 ASSERT_TRUE(fp != nullptr); 1677 ASSERT_EQ('h', fgetc(fp)); 1678 ASSERT_EQ(0, fgetc(fp)); 1679 ASSERT_EQ('e', fgetc(fp)); 1680 ASSERT_EQ(0, fgetc(fp)); 1681 ASSERT_EQ('l', fgetc(fp)); 1682 ASSERT_EQ(0, fgetc(fp)); 1683 // POSIX: "The read operation shall start at the current buffer position of 1684 // the stream." 1685 char buf2[8]; 1686 memset(buf2, 'x', sizeof(buf2)); 1687 ASSERT_EQ(4U, fread(buf2, 1, sizeof(buf2), fp)); 1688 ASSERT_EQ('l', buf2[0]); 1689 ASSERT_EQ(0, buf2[1]); 1690 ASSERT_EQ('o', buf2[2]); 1691 ASSERT_EQ(0, buf2[3]); 1692 for (size_t i = 4; i < sizeof(buf2); ++i) ASSERT_EQ('x', buf2[i]) << i; 1693 ASSERT_TRUE(feof(fp)); 1694 ASSERT_EQ(0, fclose(fp)); 1695 } 1696 1697 TEST(STDIO_TEST, fmemopen_write) { 1698 FILE* fp; 1699 char buf[8]; 1700 1701 // POSIX: "A write operation shall start either at the current position of 1702 // the stream (if mode has not specified 'a' as the first character)..." 1703 memset(buf, 'x', sizeof(buf)); 1704 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "r+")); 1705 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1706 ASSERT_EQ(0, fseek(fp, 2, SEEK_SET)); 1707 ASSERT_EQ(' ', fputc(' ', fp)); 1708 EXPECT_EQ("xx xxxxx", std::string(buf, buf + sizeof(buf))); 1709 ASSERT_EQ(0, fclose(fp)); 1710 1711 // "...or at the current size of the stream (if mode had 'a' as the first 1712 // character)." (See the fmemopen_size test for what "size" means, but for 1713 // mode "a", it's the first NUL byte.) 1714 memset(buf, 'x', sizeof(buf)); 1715 buf[3] = '\0'; 1716 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "a+")); 1717 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1718 ASSERT_EQ(' ', fputc(' ', fp)); 1719 EXPECT_EQ("xxx \0xxx"s, std::string(buf, buf + sizeof(buf))); 1720 ASSERT_EQ(0, fclose(fp)); 1721 1722 // "If the current position at the end of the write is larger than the 1723 // current buffer size, the current buffer size shall be set to the current 1724 // position." (See the fmemopen_size test for what "size" means, but to 1725 // query it we SEEK_END with offset 0, and then ftell.) 1726 memset(buf, 'x', sizeof(buf)); 1727 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "w+")); 1728 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1729 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1730 EXPECT_EQ(0, ftell(fp)); 1731 ASSERT_EQ(' ', fputc(' ', fp)); 1732 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1733 EXPECT_EQ(1, ftell(fp)); 1734 ASSERT_NE(EOF, fputs("123", fp)); 1735 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 1736 EXPECT_EQ(4, ftell(fp)); 1737 EXPECT_EQ(" 123\0xxx"s, std::string(buf, buf + sizeof(buf))); 1738 ASSERT_EQ(0, fclose(fp)); 1739 } 1740 1741 TEST(STDIO_TEST, fmemopen_write_EOF) { 1742 // POSIX: "A write operation on the stream shall not advance the current 1743 // buffer size beyond the size given in the size argument." 1744 FILE* fp; 1745 1746 // Scalar writes... 1747 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 4, "w")); 1748 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1749 ASSERT_EQ('x', fputc('x', fp)); 1750 ASSERT_EQ('x', fputc('x', fp)); 1751 ASSERT_EQ('x', fputc('x', fp)); 1752 ASSERT_EQ(EOF, fputc('x', fp)); // Only 3 fit because of the implicit NUL. 1753 ASSERT_EQ(0, fclose(fp)); 1754 1755 // Vector writes... 1756 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 4, "w")); 1757 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1758 ASSERT_EQ(3U, fwrite("xxxx", 1, 4, fp)); 1759 ASSERT_EQ(0, fclose(fp)); 1760 } 1761 1762 TEST(STDIO_TEST, fmemopen_initial_position) { 1763 // POSIX: "The ... current position in the buffer ... shall be initially 1764 // set to either the beginning of the buffer (for r and w modes) ..." 1765 char buf[] = "hello\0world"; 1766 FILE* fp; 1767 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "r")); 1768 EXPECT_EQ(0L, ftell(fp)); 1769 EXPECT_EQ(0, fclose(fp)); 1770 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "w")); 1771 EXPECT_EQ(0L, ftell(fp)); 1772 EXPECT_EQ(0, fclose(fp)); 1773 buf[0] = 'h'; // (Undo the effects of the above.) 1774 1775 // POSIX: "...or to the first null byte in the buffer (for a modes)." 1776 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "a")); 1777 EXPECT_EQ(5L, ftell(fp)); 1778 EXPECT_EQ(0, fclose(fp)); 1779 1780 // POSIX: "If no null byte is found in append mode, the initial position 1781 // shall be set to one byte after the end of the buffer." 1782 memset(buf, 'x', sizeof(buf)); 1783 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "a")); 1784 EXPECT_EQ(static_cast<long>(sizeof(buf)), ftell(fp)); 1785 EXPECT_EQ(0, fclose(fp)); 1786 } 1787 1788 TEST(STDIO_TEST, fmemopen_initial_position_allocated) { 1789 // POSIX: "If buf is a null pointer, the initial position shall always be 1790 // set to the beginning of the buffer." 1791 FILE* fp = fmemopen(nullptr, 128, "a+"); 1792 ASSERT_TRUE(fp != nullptr); 1793 EXPECT_EQ(0L, ftell(fp)); 1794 EXPECT_EQ(0L, fseek(fp, 0, SEEK_SET)); 1795 EXPECT_EQ(0, fclose(fp)); 1796 } 1797 1798 TEST(STDIO_TEST, fmemopen_zero_length) { 1799 // POSIX says it's up to the implementation whether or not you can have a 1800 // zero-length buffer (but "A future version of this standard may require 1801 // support of zero-length buffer streams explicitly"). BSD and glibc < 2.22 1802 // agreed that you couldn't, but glibc >= 2.22 allows it for consistency. 1803 FILE* fp; 1804 char buf[16]; 1805 ASSERT_NE(nullptr, fp = fmemopen(buf, 0, "r+")); 1806 ASSERT_EQ(EOF, fgetc(fp)); 1807 ASSERT_TRUE(feof(fp)); 1808 ASSERT_EQ(0, fclose(fp)); 1809 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 0, "r+")); 1810 ASSERT_EQ(EOF, fgetc(fp)); 1811 ASSERT_TRUE(feof(fp)); 1812 ASSERT_EQ(0, fclose(fp)); 1813 1814 ASSERT_NE(nullptr, fp = fmemopen(buf, 0, "w+")); 1815 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1816 ASSERT_EQ(EOF, fputc('x', fp)); 1817 ASSERT_EQ(0, fclose(fp)); 1818 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 0, "w+")); 1819 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1820 ASSERT_EQ(EOF, fputc('x', fp)); 1821 ASSERT_EQ(0, fclose(fp)); 1822 } 1823 1824 TEST(STDIO_TEST, fmemopen_zero_length_buffer_overrun) { 1825 char buf[2] = "x"; 1826 ASSERT_EQ('x', buf[0]); 1827 FILE* fp = fmemopen(buf, 0, "w"); 1828 ASSERT_EQ('x', buf[0]); 1829 ASSERT_EQ(0, fclose(fp)); 1830 } 1831 1832 TEST(STDIO_TEST, fmemopen_write_only_allocated) { 1833 // POSIX says fmemopen "may fail if the mode argument does not include a '+'". 1834 // BSD fails, glibc doesn't. We side with the more lenient. 1835 FILE* fp; 1836 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "r")); 1837 ASSERT_EQ(0, fclose(fp)); 1838 ASSERT_NE(nullptr, fp = fmemopen(nullptr, 16, "w")); 1839 ASSERT_EQ(0, fclose(fp)); 1840 } 1841 1842 TEST(STDIO_TEST, fmemopen_fileno) { 1843 // There's no fd backing an fmemopen FILE*. 1844 FILE* fp = fmemopen(nullptr, 16, "r"); 1845 ASSERT_TRUE(fp != nullptr); 1846 errno = 0; 1847 ASSERT_EQ(-1, fileno(fp)); 1848 ASSERT_EQ(EBADF, errno); 1849 ASSERT_EQ(0, fclose(fp)); 1850 } 1851 1852 TEST(STDIO_TEST, fmemopen_append_after_seek) { 1853 // In BSD and glibc < 2.22, append mode didn't force writes to append if 1854 // there had been an intervening seek. 1855 1856 FILE* fp; 1857 char buf[] = "hello\0world"; 1858 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "a")); 1859 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1860 ASSERT_EQ(0, fseek(fp, 0, SEEK_SET)); 1861 ASSERT_NE(EOF, fputc('!', fp)); 1862 EXPECT_EQ("hello!\0orld\0"s, std::string(buf, buf + sizeof(buf))); 1863 ASSERT_EQ(0, fclose(fp)); 1864 1865 memcpy(buf, "hello\0world", sizeof(buf)); 1866 ASSERT_NE(nullptr, fp = fmemopen(buf, sizeof(buf), "a+")); 1867 setbuf(fp, nullptr); // Turn off buffering so we can see what's happening as it happens. 1868 ASSERT_EQ(0, fseek(fp, 0, SEEK_SET)); 1869 ASSERT_NE(EOF, fputc('!', fp)); 1870 EXPECT_EQ("hello!\0orld\0"s, std::string(buf, buf + sizeof(buf))); 1871 ASSERT_EQ(0, fclose(fp)); 1872 } 1873 1874 TEST(STDIO_TEST, open_memstream) { 1875 char* p = nullptr; 1876 size_t size = 0; 1877 FILE* fp = open_memstream(&p, &size); 1878 ASSERT_NE(EOF, fputs("hello, world!", fp)); 1879 fclose(fp); 1880 1881 ASSERT_STREQ("hello, world!", p); 1882 ASSERT_EQ(strlen("hello, world!"), size); 1883 free(p); 1884 } 1885 1886 TEST(STDIO_TEST, open_memstream_EINVAL) { 1887 #if defined(__BIONIC__) 1888 char* p; 1889 size_t size; 1890 1891 // Invalid buffer. 1892 errno = 0; 1893 ASSERT_EQ(nullptr, open_memstream(nullptr, &size)); 1894 ASSERT_EQ(EINVAL, errno); 1895 1896 // Invalid size. 1897 errno = 0; 1898 ASSERT_EQ(nullptr, open_memstream(&p, nullptr)); 1899 ASSERT_EQ(EINVAL, errno); 1900 #else 1901 GTEST_SKIP() << "glibc is broken"; 1902 #endif 1903 } 1904 1905 TEST(STDIO_TEST, fdopen_CLOEXEC) { 1906 int fd = open("/proc/version", O_RDONLY); 1907 ASSERT_TRUE(fd != -1); 1908 1909 // This fd doesn't have O_CLOEXEC... 1910 AssertCloseOnExec(fd, false); 1911 1912 FILE* fp = fdopen(fd, "re"); 1913 ASSERT_TRUE(fp != nullptr); 1914 1915 // ...but the new one does. 1916 AssertCloseOnExec(fileno(fp), true); 1917 1918 fclose(fp); 1919 } 1920 1921 TEST(STDIO_TEST, freopen_CLOEXEC) { 1922 FILE* fp = fopen("/proc/version", "r"); 1923 ASSERT_TRUE(fp != nullptr); 1924 1925 // This FILE* doesn't have O_CLOEXEC... 1926 AssertCloseOnExec(fileno(fp), false); 1927 1928 fp = freopen("/proc/version", "re", fp); 1929 1930 // ...but the new one does. 1931 AssertCloseOnExec(fileno(fp), true); 1932 1933 fclose(fp); 1934 } 1935 1936 TEST(STDIO_TEST, fopen64_freopen64) { 1937 FILE* fp = fopen64("/proc/version", "r"); 1938 ASSERT_TRUE(fp != nullptr); 1939 fp = freopen64("/proc/version", "re", fp); 1940 ASSERT_TRUE(fp != nullptr); 1941 fclose(fp); 1942 } 1943 1944 // https://code.google.com/p/android/issues/detail?id=81155 1945 // http://b/18556607 1946 TEST(STDIO_TEST, fread_unbuffered_pathological_performance) { 1947 FILE* fp = fopen("/dev/zero", "r"); 1948 ASSERT_TRUE(fp != nullptr); 1949 1950 // Make this stream unbuffered. 1951 setvbuf(fp, nullptr, _IONBF, 0); 1952 1953 char buf[65*1024]; 1954 memset(buf, 0xff, sizeof(buf)); 1955 1956 time_t t0 = time(nullptr); 1957 for (size_t i = 0; i < 1024; ++i) { 1958 ASSERT_EQ(1U, fread(buf, 64*1024, 1, fp)); 1959 } 1960 time_t t1 = time(nullptr); 1961 1962 fclose(fp); 1963 1964 // 1024 64KiB reads should have been very quick. 1965 ASSERT_LE(t1 - t0, 1); 1966 1967 for (size_t i = 0; i < 64*1024; ++i) { 1968 ASSERT_EQ('\0', buf[i]); 1969 } 1970 for (size_t i = 64*1024; i < 65*1024; ++i) { 1971 ASSERT_EQ('\xff', buf[i]); 1972 } 1973 } 1974 1975 TEST(STDIO_TEST, fread_EOF) { 1976 std::string digits("0123456789"); 1977 FILE* fp = fmemopen(&digits[0], digits.size(), "r"); 1978 1979 // Try to read too much, but little enough that it still fits in the FILE's internal buffer. 1980 char buf1[4 * 4]; 1981 memset(buf1, 0, sizeof(buf1)); 1982 ASSERT_EQ(2U, fread(buf1, 4, 4, fp)); 1983 ASSERT_STREQ("0123456789", buf1); 1984 ASSERT_TRUE(feof(fp)); 1985 1986 rewind(fp); 1987 1988 // Try to read way too much so stdio tries to read more direct from the stream. 1989 char buf2[4 * 4096]; 1990 memset(buf2, 0, sizeof(buf2)); 1991 ASSERT_EQ(2U, fread(buf2, 4, 4096, fp)); 1992 ASSERT_STREQ("0123456789", buf2); 1993 ASSERT_TRUE(feof(fp)); 1994 1995 fclose(fp); 1996 } 1997 1998 static void test_fread_from_write_only_stream(size_t n) { 1999 FILE* fp = fopen("/dev/null", "w"); 2000 std::vector<char> buf(n, 0); 2001 errno = 0; 2002 ASSERT_EQ(0U, fread(&buf[0], n, 1, fp)); 2003 ASSERT_EQ(EBADF, errno); 2004 ASSERT_TRUE(ferror(fp)); 2005 ASSERT_FALSE(feof(fp)); 2006 fclose(fp); 2007 } 2008 2009 TEST(STDIO_TEST, fread_from_write_only_stream_slow_path) { 2010 test_fread_from_write_only_stream(1); 2011 } 2012 2013 TEST(STDIO_TEST, fread_from_write_only_stream_fast_path) { 2014 test_fread_from_write_only_stream(64*1024); 2015 } 2016 2017 static void test_fwrite_after_fread(size_t n) { 2018 TemporaryFile tf; 2019 2020 FILE* fp = fdopen(tf.fd, "w+"); 2021 ASSERT_EQ(1U, fwrite("1", 1, 1, fp)); 2022 fflush(fp); 2023 2024 // We've flushed but not rewound, so there's nothing to read. 2025 std::vector<char> buf(n, 0); 2026 ASSERT_EQ(0U, fread(&buf[0], 1, buf.size(), fp)); 2027 ASSERT_TRUE(feof(fp)); 2028 2029 // But hitting EOF doesn't prevent us from writing... 2030 errno = 0; 2031 ASSERT_EQ(1U, fwrite("2", 1, 1, fp)) << strerror(errno); 2032 2033 // And if we rewind, everything's there. 2034 rewind(fp); 2035 ASSERT_EQ(2U, fread(&buf[0], 1, buf.size(), fp)); 2036 ASSERT_EQ('1', buf[0]); 2037 ASSERT_EQ('2', buf[1]); 2038 2039 fclose(fp); 2040 } 2041 2042 TEST(STDIO_TEST, fwrite_after_fread_slow_path) { 2043 test_fwrite_after_fread(16); 2044 } 2045 2046 TEST(STDIO_TEST, fwrite_after_fread_fast_path) { 2047 test_fwrite_after_fread(64*1024); 2048 } 2049 2050 // http://b/19172514 2051 TEST(STDIO_TEST, fread_after_fseek) { 2052 TemporaryFile tf; 2053 2054 FILE* fp = fopen(tf.path, "w+"); 2055 ASSERT_TRUE(fp != nullptr); 2056 2057 char file_data[12288]; 2058 for (size_t i = 0; i < 12288; i++) { 2059 file_data[i] = i; 2060 } 2061 ASSERT_EQ(12288U, fwrite(file_data, 1, 12288, fp)); 2062 fclose(fp); 2063 2064 fp = fopen(tf.path, "r"); 2065 ASSERT_TRUE(fp != nullptr); 2066 2067 char buffer[8192]; 2068 size_t cur_location = 0; 2069 // Small read to populate internal buffer. 2070 ASSERT_EQ(100U, fread(buffer, 1, 100, fp)); 2071 ASSERT_EQ(memcmp(file_data, buffer, 100), 0); 2072 2073 cur_location = static_cast<size_t>(ftell(fp)); 2074 // Large read to force reading into the user supplied buffer and bypassing 2075 // the internal buffer. 2076 ASSERT_EQ(8192U, fread(buffer, 1, 8192, fp)); 2077 ASSERT_EQ(memcmp(file_data+cur_location, buffer, 8192), 0); 2078 2079 // Small backwards seek to verify fseek does not reuse the internal buffer. 2080 ASSERT_EQ(0, fseek(fp, -22, SEEK_CUR)) << strerror(errno); 2081 cur_location = static_cast<size_t>(ftell(fp)); 2082 ASSERT_EQ(22U, fread(buffer, 1, 22, fp)); 2083 ASSERT_EQ(memcmp(file_data+cur_location, buffer, 22), 0); 2084 2085 fclose(fp); 2086 } 2087 2088 // https://code.google.com/p/android/issues/detail?id=184847 2089 TEST(STDIO_TEST, fread_EOF_184847) { 2090 TemporaryFile tf; 2091 char buf[6] = {0}; 2092 2093 FILE* fw = fopen(tf.path, "w"); 2094 ASSERT_TRUE(fw != nullptr); 2095 2096 FILE* fr = fopen(tf.path, "r"); 2097 ASSERT_TRUE(fr != nullptr); 2098 2099 fwrite("a", 1, 1, fw); 2100 fflush(fw); 2101 ASSERT_EQ(1U, fread(buf, 1, 1, fr)); 2102 ASSERT_STREQ("a", buf); 2103 2104 // 'fr' is now at EOF. 2105 ASSERT_EQ(0U, fread(buf, 1, 1, fr)); 2106 ASSERT_TRUE(feof(fr)); 2107 2108 // Write some more... 2109 fwrite("z", 1, 1, fw); 2110 fflush(fw); 2111 2112 // ...and check that we can read it back. 2113 // (BSD thinks that once a stream has hit EOF, it must always return EOF. SysV disagrees.) 2114 ASSERT_EQ(1U, fread(buf, 1, 1, fr)); 2115 ASSERT_STREQ("z", buf); 2116 2117 // But now we're done. 2118 ASSERT_EQ(0U, fread(buf, 1, 1, fr)); 2119 2120 fclose(fr); 2121 fclose(fw); 2122 } 2123 2124 TEST(STDIO_TEST, fclose_invalidates_fd) { 2125 // The typical error we're trying to help people catch involves accessing 2126 // memory after it's been freed. But we know that stdin/stdout/stderr are 2127 // special and don't get deallocated, so this test uses stdin. 2128 ASSERT_EQ(0, fclose(stdin)); 2129 2130 // Even though using a FILE* after close is undefined behavior, I've closed 2131 // this bug as "WAI" too many times. We shouldn't hand out stale fds, 2132 // especially because they might actually correspond to a real stream. 2133 errno = 0; 2134 ASSERT_EQ(-1, fileno(stdin)); 2135 ASSERT_EQ(EBADF, errno); 2136 } 2137 2138 TEST(STDIO_TEST, fseek_ftell_unseekable) { 2139 #if defined(__BIONIC__) // glibc has fopencookie instead. 2140 auto read_fn = [](void*, char*, int) { return -1; }; 2141 FILE* fp = funopen(nullptr, read_fn, nullptr, nullptr, nullptr); 2142 ASSERT_TRUE(fp != nullptr); 2143 2144 // Check that ftell balks on an unseekable FILE*. 2145 errno = 0; 2146 ASSERT_EQ(-1, ftell(fp)); 2147 ASSERT_EQ(ESPIPE, errno); 2148 2149 // SEEK_CUR is rewritten as SEEK_SET internally... 2150 errno = 0; 2151 ASSERT_EQ(-1, fseek(fp, 0, SEEK_CUR)); 2152 ASSERT_EQ(ESPIPE, errno); 2153 2154 // ...so it's worth testing the direct seek path too. 2155 errno = 0; 2156 ASSERT_EQ(-1, fseek(fp, 0, SEEK_SET)); 2157 ASSERT_EQ(ESPIPE, errno); 2158 2159 fclose(fp); 2160 #else 2161 GTEST_SKIP() << "glibc uses fopencookie instead"; 2162 #endif 2163 } 2164 2165 TEST(STDIO_TEST, funopen_EINVAL) { 2166 #if defined(__BIONIC__) 2167 errno = 0; 2168 ASSERT_EQ(nullptr, funopen(nullptr, nullptr, nullptr, nullptr, nullptr)); 2169 ASSERT_EQ(EINVAL, errno); 2170 #else 2171 GTEST_SKIP() << "glibc uses fopencookie instead"; 2172 #endif 2173 } 2174 2175 TEST(STDIO_TEST, funopen_seek) { 2176 #if defined(__BIONIC__) 2177 auto read_fn = [](void*, char*, int) { return -1; }; 2178 2179 auto seek_fn = [](void*, fpos_t, int) -> fpos_t { return 0xfedcba12; }; 2180 auto seek64_fn = [](void*, fpos64_t, int) -> fpos64_t { return 0xfedcba12345678; }; 2181 2182 FILE* fp = funopen(nullptr, read_fn, nullptr, seek_fn, nullptr); 2183 ASSERT_TRUE(fp != nullptr); 2184 fpos_t pos; 2185 #if defined(__LP64__) 2186 EXPECT_EQ(0, fgetpos(fp, &pos)) << strerror(errno); 2187 EXPECT_EQ(0xfedcba12LL, pos); 2188 #else 2189 EXPECT_EQ(-1, fgetpos(fp, &pos)) << strerror(errno); 2190 EXPECT_EQ(EOVERFLOW, errno); 2191 #endif 2192 2193 FILE* fp64 = funopen64(nullptr, read_fn, nullptr, seek64_fn, nullptr); 2194 ASSERT_TRUE(fp64 != nullptr); 2195 fpos64_t pos64; 2196 EXPECT_EQ(0, fgetpos64(fp64, &pos64)) << strerror(errno); 2197 EXPECT_EQ(0xfedcba12345678, pos64); 2198 #else 2199 GTEST_SKIP() << "glibc uses fopencookie instead"; 2200 #endif 2201 } 2202 2203 TEST(STDIO_TEST, lots_of_concurrent_files) { 2204 std::vector<TemporaryFile*> tfs; 2205 std::vector<FILE*> fps; 2206 2207 for (size_t i = 0; i < 256; ++i) { 2208 TemporaryFile* tf = new TemporaryFile; 2209 tfs.push_back(tf); 2210 FILE* fp = fopen(tf->path, "w+"); 2211 fps.push_back(fp); 2212 fprintf(fp, "hello %zu!\n", i); 2213 fflush(fp); 2214 } 2215 2216 for (size_t i = 0; i < 256; ++i) { 2217 char expected[BUFSIZ]; 2218 snprintf(expected, sizeof(expected), "hello %zu!\n", i); 2219 2220 AssertFileIs(fps[i], expected); 2221 fclose(fps[i]); 2222 delete tfs[i]; 2223 } 2224 } 2225 2226 static void AssertFileOffsetAt(FILE* fp, off64_t offset) { 2227 EXPECT_EQ(offset, ftell(fp)); 2228 EXPECT_EQ(offset, ftello(fp)); 2229 EXPECT_EQ(offset, ftello64(fp)); 2230 fpos_t pos; 2231 fpos64_t pos64; 2232 EXPECT_EQ(0, fgetpos(fp, &pos)); 2233 EXPECT_EQ(0, fgetpos64(fp, &pos64)); 2234 #if defined(__BIONIC__) 2235 EXPECT_EQ(offset, static_cast<off64_t>(pos)); 2236 EXPECT_EQ(offset, static_cast<off64_t>(pos64)); 2237 #else 2238 GTEST_SKIP() << "glibc's fpos_t is opaque"; 2239 #endif 2240 } 2241 2242 TEST(STDIO_TEST, seek_tell_family_smoke) { 2243 TemporaryFile tf; 2244 FILE* fp = fdopen(tf.fd, "w+"); 2245 2246 // Initially we should be at 0. 2247 AssertFileOffsetAt(fp, 0); 2248 2249 // Seek to offset 8192. 2250 ASSERT_EQ(0, fseek(fp, 8192, SEEK_SET)); 2251 AssertFileOffsetAt(fp, 8192); 2252 fpos_t eight_k_pos; 2253 ASSERT_EQ(0, fgetpos(fp, &eight_k_pos)); 2254 2255 // Seek forward another 8192... 2256 ASSERT_EQ(0, fseek(fp, 8192, SEEK_CUR)); 2257 AssertFileOffsetAt(fp, 8192 + 8192); 2258 fpos64_t sixteen_k_pos64; 2259 ASSERT_EQ(0, fgetpos64(fp, &sixteen_k_pos64)); 2260 2261 // Seek back 8192... 2262 ASSERT_EQ(0, fseek(fp, -8192, SEEK_CUR)); 2263 AssertFileOffsetAt(fp, 8192); 2264 2265 // Since we haven't written anything, the end is also at 0. 2266 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 2267 AssertFileOffsetAt(fp, 0); 2268 2269 // Check that our fpos64_t from 16KiB works... 2270 ASSERT_EQ(0, fsetpos64(fp, &sixteen_k_pos64)); 2271 AssertFileOffsetAt(fp, 8192 + 8192); 2272 // ...as does our fpos_t from 8192. 2273 ASSERT_EQ(0, fsetpos(fp, &eight_k_pos)); 2274 AssertFileOffsetAt(fp, 8192); 2275 2276 // Do fseeko and fseeko64 work too? 2277 ASSERT_EQ(0, fseeko(fp, 1234, SEEK_SET)); 2278 AssertFileOffsetAt(fp, 1234); 2279 ASSERT_EQ(0, fseeko64(fp, 5678, SEEK_SET)); 2280 AssertFileOffsetAt(fp, 5678); 2281 2282 fclose(fp); 2283 } 2284 2285 TEST(STDIO_TEST, fseek_fseeko_EINVAL) { 2286 TemporaryFile tf; 2287 FILE* fp = fdopen(tf.fd, "w+"); 2288 2289 // Bad whence. 2290 errno = 0; 2291 ASSERT_EQ(-1, fseek(fp, 0, 123)); 2292 ASSERT_EQ(EINVAL, errno); 2293 errno = 0; 2294 ASSERT_EQ(-1, fseeko(fp, 0, 123)); 2295 ASSERT_EQ(EINVAL, errno); 2296 errno = 0; 2297 ASSERT_EQ(-1, fseeko64(fp, 0, 123)); 2298 ASSERT_EQ(EINVAL, errno); 2299 2300 // Bad offset. 2301 errno = 0; 2302 ASSERT_EQ(-1, fseek(fp, -1, SEEK_SET)); 2303 ASSERT_EQ(EINVAL, errno); 2304 errno = 0; 2305 ASSERT_EQ(-1, fseeko(fp, -1, SEEK_SET)); 2306 ASSERT_EQ(EINVAL, errno); 2307 errno = 0; 2308 ASSERT_EQ(-1, fseeko64(fp, -1, SEEK_SET)); 2309 ASSERT_EQ(EINVAL, errno); 2310 2311 fclose(fp); 2312 } 2313 2314 TEST(STDIO_TEST, ctermid) { 2315 ASSERT_STREQ("/dev/tty", ctermid(nullptr)); 2316 2317 char buf[L_ctermid] = {}; 2318 ASSERT_EQ(buf, ctermid(buf)); 2319 ASSERT_STREQ("/dev/tty", buf); 2320 } 2321 2322 TEST(STDIO_TEST, remove) { 2323 struct stat sb; 2324 2325 TemporaryFile tf; 2326 ASSERT_EQ(0, remove(tf.path)); 2327 ASSERT_EQ(-1, lstat(tf.path, &sb)); 2328 ASSERT_EQ(ENOENT, errno); 2329 2330 TemporaryDir td; 2331 ASSERT_EQ(0, remove(td.path)); 2332 ASSERT_EQ(-1, lstat(td.path, &sb)); 2333 ASSERT_EQ(ENOENT, errno); 2334 2335 errno = 0; 2336 ASSERT_EQ(-1, remove(tf.path)); 2337 ASSERT_EQ(ENOENT, errno); 2338 2339 errno = 0; 2340 ASSERT_EQ(-1, remove(td.path)); 2341 ASSERT_EQ(ENOENT, errno); 2342 } 2343 2344 TEST(STDIO_DEATHTEST, snprintf_30445072_known_buffer_size) { 2345 char buf[16]; 2346 ASSERT_EXIT(snprintf(buf, atol("-1"), "hello"), 2347 testing::KilledBySignal(SIGABRT), 2348 #if defined(NOFORTIFY) 2349 "FORTIFY: vsnprintf: size .* > SSIZE_MAX" 2350 #else 2351 "FORTIFY: vsnprintf: prevented .*-byte write into 16-byte buffer" 2352 #endif 2353 ); 2354 } 2355 2356 TEST(STDIO_DEATHTEST, snprintf_30445072_unknown_buffer_size) { 2357 std::string buf = "world"; 2358 ASSERT_EXIT(snprintf(&buf[0], atol("-1"), "hello"), 2359 testing::KilledBySignal(SIGABRT), 2360 "FORTIFY: vsnprintf: size .* > SSIZE_MAX"); 2361 } 2362 2363 TEST(STDIO_TEST, sprintf_30445072) { 2364 std::string buf = "world"; 2365 sprintf(&buf[0], "hello"); 2366 ASSERT_EQ(buf, "hello"); 2367 } 2368 2369 TEST(STDIO_TEST, printf_m) { 2370 char buf[BUFSIZ]; 2371 errno = 0; 2372 snprintf(buf, sizeof(buf), "<%m>"); 2373 ASSERT_STREQ("<Success>", buf); 2374 errno = -1; 2375 snprintf(buf, sizeof(buf), "<%m>"); 2376 ASSERT_STREQ("<Unknown error -1>", buf); 2377 errno = EINVAL; 2378 snprintf(buf, sizeof(buf), "<%m>"); 2379 ASSERT_STREQ("<Invalid argument>", buf); 2380 } 2381 2382 TEST(STDIO_TEST, printf_m_does_not_clobber_strerror) { 2383 char buf[BUFSIZ]; 2384 const char* m = strerror(-1); 2385 ASSERT_STREQ("Unknown error -1", m); 2386 errno = -2; 2387 snprintf(buf, sizeof(buf), "<%m>"); 2388 ASSERT_STREQ("<Unknown error -2>", buf); 2389 ASSERT_STREQ("Unknown error -1", m); 2390 } 2391 2392 TEST(STDIO_TEST, wprintf_m) { 2393 wchar_t buf[BUFSIZ]; 2394 errno = 0; 2395 swprintf(buf, sizeof(buf), L"<%m>"); 2396 ASSERT_EQ(std::wstring(L"<Success>"), buf); 2397 errno = -1; 2398 swprintf(buf, sizeof(buf), L"<%m>"); 2399 ASSERT_EQ(std::wstring(L"<Unknown error -1>"), buf); 2400 errno = EINVAL; 2401 swprintf(buf, sizeof(buf), L"<%m>"); 2402 ASSERT_EQ(std::wstring(L"<Invalid argument>"), buf); 2403 } 2404 2405 TEST(STDIO_TEST, wprintf_m_does_not_clobber_strerror) { 2406 wchar_t buf[BUFSIZ]; 2407 const char* m = strerror(-1); 2408 ASSERT_STREQ("Unknown error -1", m); 2409 errno = -2; 2410 swprintf(buf, sizeof(buf), L"<%m>"); 2411 ASSERT_EQ(std::wstring(L"<Unknown error -2>"), buf); 2412 ASSERT_STREQ("Unknown error -1", m); 2413 } 2414 2415 TEST(STDIO_TEST, fopen_append_mode_and_ftell) { 2416 TemporaryFile tf; 2417 SetFileTo(tf.path, "0123456789"); 2418 FILE* fp = fopen(tf.path, "a"); 2419 EXPECT_EQ(10, ftell(fp)); 2420 ASSERT_EQ(0, fseek(fp, 2, SEEK_SET)); 2421 EXPECT_EQ(2, ftell(fp)); 2422 ASSERT_NE(EOF, fputs("xxx", fp)); 2423 ASSERT_EQ(0, fflush(fp)); 2424 EXPECT_EQ(13, ftell(fp)); 2425 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 2426 EXPECT_EQ(13, ftell(fp)); 2427 ASSERT_EQ(0, fclose(fp)); 2428 AssertFileIs(tf.path, "0123456789xxx"); 2429 } 2430 2431 TEST(STDIO_TEST, fdopen_append_mode_and_ftell) { 2432 TemporaryFile tf; 2433 SetFileTo(tf.path, "0123456789"); 2434 int fd = open(tf.path, O_RDWR); 2435 ASSERT_NE(-1, fd); 2436 // POSIX: "The file position indicator associated with the new stream is set to the position 2437 // indicated by the file offset associated with the file descriptor." 2438 ASSERT_EQ(4, lseek(fd, 4, SEEK_SET)); 2439 FILE* fp = fdopen(fd, "a"); 2440 EXPECT_EQ(4, ftell(fp)); 2441 ASSERT_EQ(0, fseek(fp, 2, SEEK_SET)); 2442 EXPECT_EQ(2, ftell(fp)); 2443 ASSERT_NE(EOF, fputs("xxx", fp)); 2444 ASSERT_EQ(0, fflush(fp)); 2445 EXPECT_EQ(13, ftell(fp)); 2446 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 2447 EXPECT_EQ(13, ftell(fp)); 2448 ASSERT_EQ(0, fclose(fp)); 2449 AssertFileIs(tf.path, "0123456789xxx"); 2450 } 2451 2452 TEST(STDIO_TEST, freopen_append_mode_and_ftell) { 2453 TemporaryFile tf; 2454 SetFileTo(tf.path, "0123456789"); 2455 FILE* other_fp = fopen("/proc/version", "r"); 2456 FILE* fp = freopen(tf.path, "a", other_fp); 2457 EXPECT_EQ(10, ftell(fp)); 2458 ASSERT_EQ(0, fseek(fp, 2, SEEK_SET)); 2459 EXPECT_EQ(2, ftell(fp)); 2460 ASSERT_NE(EOF, fputs("xxx", fp)); 2461 ASSERT_EQ(0, fflush(fp)); 2462 EXPECT_EQ(13, ftell(fp)); 2463 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 2464 EXPECT_EQ(13, ftell(fp)); 2465 ASSERT_EQ(0, fclose(fp)); 2466 AssertFileIs(tf.path, "0123456789xxx"); 2467 } 2468 2469 TEST(STDIO_TEST, constants) { 2470 ASSERT_LE(FILENAME_MAX, PATH_MAX); 2471 ASSERT_EQ(L_tmpnam, PATH_MAX); 2472 } 2473 2474 TEST(STDIO_TEST, perror) { 2475 ExecTestHelper eth; 2476 eth.Run([&]() { errno = EINVAL; perror("a b c"); exit(0); }, 0, "a b c: Invalid argument\n"); 2477 eth.Run([&]() { errno = EINVAL; perror(nullptr); exit(0); }, 0, "Invalid argument\n"); 2478 eth.Run([&]() { errno = EINVAL; perror(""); exit(0); }, 0, "Invalid argument\n"); 2479 } 2480 2481 TEST(STDIO_TEST, puts) { 2482 ExecTestHelper eth; 2483 eth.Run([&]() { exit(puts("a b c")); }, 0, "a b c\n"); 2484 } 2485 2486 TEST(STDIO_TEST, unlocked) { 2487 TemporaryFile tf; 2488 2489 FILE* fp = fopen(tf.path, "w+"); 2490 ASSERT_TRUE(fp != nullptr); 2491 2492 clearerr_unlocked(fp); 2493 ASSERT_FALSE(feof_unlocked(fp)); 2494 ASSERT_FALSE(ferror_unlocked(fp)); 2495 2496 ASSERT_EQ(fileno(fp), fileno_unlocked(fp)); 2497 2498 ASSERT_NE(EOF, putc_unlocked('a', fp)); 2499 ASSERT_NE(EOF, putc('b', fp)); 2500 ASSERT_NE(EOF, fputc_unlocked('c', fp)); 2501 ASSERT_NE(EOF, fputc('d', fp)); 2502 2503 rewind(fp); 2504 ASSERT_EQ('a', getc_unlocked(fp)); 2505 ASSERT_EQ('b', getc(fp)); 2506 ASSERT_EQ('c', fgetc_unlocked(fp)); 2507 ASSERT_EQ('d', fgetc(fp)); 2508 2509 rewind(fp); 2510 ASSERT_EQ(2U, fwrite_unlocked("AB", 1, 2, fp)); 2511 ASSERT_EQ(2U, fwrite("CD", 1, 2, fp)); 2512 ASSERT_EQ(0, fflush_unlocked(fp)); 2513 2514 rewind(fp); 2515 char buf[BUFSIZ] = {}; 2516 ASSERT_EQ(2U, fread_unlocked(&buf[0], 1, 2, fp)); 2517 ASSERT_EQ(2U, fread(&buf[2], 1, 2, fp)); 2518 ASSERT_STREQ("ABCD", buf); 2519 2520 rewind(fp); 2521 ASSERT_NE(EOF, fputs("hello ", fp)); 2522 ASSERT_NE(EOF, fputs_unlocked("world", fp)); 2523 ASSERT_NE(EOF, fputc('\n', fp)); 2524 2525 rewind(fp); 2526 ASSERT_TRUE(fgets_unlocked(buf, sizeof(buf), fp) != nullptr); 2527 ASSERT_STREQ("hello world\n", buf); 2528 2529 ASSERT_EQ(0, fclose(fp)); 2530 } 2531 2532 TEST(STDIO_TEST, fseek_64bit) { 2533 TemporaryFile tf; 2534 FILE* fp = fopen64(tf.path, "w+"); 2535 ASSERT_TRUE(fp != nullptr); 2536 ASSERT_EQ(0, fseeko64(fp, 0x2'0000'0000, SEEK_SET)); 2537 ASSERT_EQ(0x2'0000'0000, ftello64(fp)); 2538 ASSERT_EQ(0, fseeko64(fp, 0x1'0000'0000, SEEK_CUR)); 2539 ASSERT_EQ(0x3'0000'0000, ftello64(fp)); 2540 ASSERT_EQ(0, fclose(fp)); 2541 } 2542 2543 // POSIX requires that fseek/fseeko fail with EOVERFLOW if the new file offset 2544 // isn't representable in long/off_t. 2545 TEST(STDIO_TEST, fseek_overflow_32bit) { 2546 TemporaryFile tf; 2547 FILE* fp = fopen64(tf.path, "w+"); 2548 ASSERT_EQ(0, ftruncate64(fileno(fp), 0x2'0000'0000)); 2549 2550 // Bionic implements overflow checking for SEEK_CUR, but glibc doesn't. 2551 #if defined(__BIONIC__) && !defined(__LP64__) 2552 ASSERT_EQ(0, fseek(fp, 0x7fff'ffff, SEEK_SET)); 2553 ASSERT_EQ(-1, fseek(fp, 1, SEEK_CUR)); 2554 ASSERT_EQ(EOVERFLOW, errno); 2555 #endif 2556 2557 // Neither Bionic nor glibc implement the overflow checking for SEEK_END. 2558 // (Aside: FreeBSD's libc is an example of a libc that checks both SEEK_CUR 2559 // and SEEK_END -- many C libraries check neither.) 2560 ASSERT_EQ(0, fseek(fp, 0, SEEK_END)); 2561 ASSERT_EQ(0x2'0000'0000, ftello64(fp)); 2562 2563 fclose(fp); 2564 } 2565 2566 TEST(STDIO_TEST, dev_std_files) { 2567 // POSIX only mentions /dev/stdout, but we should have all three (http://b/31824379). 2568 char path[PATH_MAX]; 2569 ssize_t length = readlink("/dev/stdin", path, sizeof(path)); 2570 ASSERT_LT(0, length); 2571 ASSERT_EQ("/proc/self/fd/0", std::string(path, length)); 2572 2573 length = readlink("/dev/stdout", path, sizeof(path)); 2574 ASSERT_LT(0, length); 2575 ASSERT_EQ("/proc/self/fd/1", std::string(path, length)); 2576 2577 length = readlink("/dev/stderr", path, sizeof(path)); 2578 ASSERT_LT(0, length); 2579 ASSERT_EQ("/proc/self/fd/2", std::string(path, length)); 2580 } 2581 2582 TEST(STDIO_TEST, fread_with_locked_file) { 2583 // Reading an unbuffered/line-buffered file from one thread shouldn't block on 2584 // files locked on other threads, even if it flushes some line-buffered files. 2585 FILE* fp1 = fopen("/dev/zero", "r"); 2586 ASSERT_TRUE(fp1 != nullptr); 2587 flockfile(fp1); 2588 2589 std::thread([] { 2590 for (int mode : { _IONBF, _IOLBF }) { 2591 FILE* fp2 = fopen("/dev/zero", "r"); 2592 ASSERT_TRUE(fp2 != nullptr); 2593 setvbuf(fp2, nullptr, mode, 0); 2594 ASSERT_EQ('\0', fgetc(fp2)); 2595 fclose(fp2); 2596 } 2597 }).join(); 2598 2599 funlockfile(fp1); 2600 fclose(fp1); 2601 } 2602