stdio_test.cpp revision 8e613cf342b369f7985135dbe11ebdbf8c736157 
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/stat.h>
26#include <unistd.h>
27#include <wchar.h>
28#include <locale.h>
29
30#include "TemporaryFile.h"
31
32TEST(stdio, tmpfile_fileno_fprintf_rewind_fgets) {
33  FILE* fp = tmpfile();
34  ASSERT_TRUE(fp != NULL);
35
36  int fd = fileno(fp);
37  ASSERT_NE(fd, -1);
38
39  struct stat sb;
40  int rc = fstat(fd, &sb);
41  ASSERT_NE(rc, -1);
42  ASSERT_EQ(sb.st_mode & 0777, 0600U);
43
44  rc = fprintf(fp, "hello\n");
45  ASSERT_EQ(rc, 6);
46
47  rewind(fp);
48
49  char buf[16];
50  char* s = fgets(buf, sizeof(buf), fp);
51  ASSERT_TRUE(s != NULL);
52  ASSERT_STREQ("hello\n", s);
53
54  fclose(fp);
55}
56
57TEST(stdio, dprintf) {
58  TemporaryFile tf;
59
60  int rc = dprintf(tf.fd, "hello\n");
61  ASSERT_EQ(rc, 6);
62
63  lseek(tf.fd, SEEK_SET, 0);
64  FILE* tfile = fdopen(tf.fd, "r");
65  ASSERT_TRUE(tfile != NULL);
66
67  char buf[7];
68  ASSERT_EQ(buf, fgets(buf, sizeof(buf), tfile));
69  ASSERT_STREQ("hello\n", buf);
70  // Make sure there isn't anything else in the file.
71  ASSERT_EQ(NULL, fgets(buf, sizeof(buf), tfile));
72  fclose(tfile);
73}
74
75TEST(stdio, getdelim) {
76  FILE* fp = tmpfile();
77  ASSERT_TRUE(fp != NULL);
78
79  const char* line_written = "This  is a test";
80  int rc = fprintf(fp, "%s", line_written);
81  ASSERT_EQ(rc, static_cast<int>(strlen(line_written)));
82
83  rewind(fp);
84
85  char* word_read = NULL;
86  size_t allocated_length = 0;
87
88  const char* expected[] = { "This ", " ", "is ", "a ", "test" };
89  for (size_t i = 0; i < 5; ++i) {
90    ASSERT_FALSE(feof(fp));
91    ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), static_cast<int>(strlen(expected[i])));
92    ASSERT_GE(allocated_length, strlen(expected[i]));
93    ASSERT_STREQ(word_read, expected[i]);
94  }
95  // The last read should have set the end-of-file indicator for the stream.
96  ASSERT_TRUE(feof(fp));
97  clearerr(fp);
98
99  // getdelim returns -1 but doesn't set errno if we're already at EOF.
100  // It should set the end-of-file indicator for the stream, though.
101  errno = 0;
102  ASSERT_EQ(getdelim(&word_read, &allocated_length, ' ', fp), -1);
103  ASSERT_EQ(0, errno);
104  ASSERT_TRUE(feof(fp));
105
106  free(word_read);
107  fclose(fp);
108}
109
110TEST(stdio, getdelim_invalid) {
111  FILE* fp = tmpfile();
112  ASSERT_TRUE(fp != NULL);
113
114  char* buffer = NULL;
115  size_t buffer_length = 0;
116
117  // The first argument can't be NULL.
118  errno = 0;
119  ASSERT_EQ(getdelim(NULL, &buffer_length, ' ', fp), -1);
120  ASSERT_EQ(EINVAL, errno);
121
122  // The second argument can't be NULL.
123  errno = 0;
124  ASSERT_EQ(getdelim(&buffer, NULL, ' ', fp), -1);
125  ASSERT_EQ(EINVAL, errno);
126
127  // The underlying fd can't be closed.
128  ASSERT_EQ(0, close(fileno(fp)));
129  errno = 0;
130  ASSERT_EQ(getdelim(&buffer, &buffer_length, ' ', fp), -1);
131  ASSERT_EQ(EBADF, errno);
132  fclose(fp);
133}
134
135TEST(stdio, getline) {
136  FILE* fp = tmpfile();
137  ASSERT_TRUE(fp != NULL);
138
139  const char* line_written = "This is a test for getline\n";
140  const size_t line_count = 5;
141
142  for (size_t i = 0; i < line_count; ++i) {
143    int rc = fprintf(fp, "%s", line_written);
144    ASSERT_EQ(rc, static_cast<int>(strlen(line_written)));
145  }
146
147  rewind(fp);
148
149  char* line_read = NULL;
150  size_t allocated_length = 0;
151
152  size_t read_line_count = 0;
153  ssize_t read_char_count;
154  while ((read_char_count = getline(&line_read, &allocated_length, fp)) != -1) {
155    ASSERT_EQ(read_char_count, static_cast<int>(strlen(line_written)));
156    ASSERT_GE(allocated_length, strlen(line_written));
157    ASSERT_STREQ(line_read, line_written);
158    ++read_line_count;
159  }
160  ASSERT_EQ(read_line_count, line_count);
161
162  // The last read should have set the end-of-file indicator for the stream.
163  ASSERT_TRUE(feof(fp));
164  clearerr(fp);
165
166  // getline returns -1 but doesn't set errno if we're already at EOF.
167  // It should set the end-of-file indicator for the stream, though.
168  errno = 0;
169  ASSERT_EQ(getline(&line_read, &allocated_length, fp), -1);
170  ASSERT_EQ(0, errno);
171  ASSERT_TRUE(feof(fp));
172
173  free(line_read);
174  fclose(fp);
175}
176
177TEST(stdio, getline_invalid) {
178  FILE* fp = tmpfile();
179  ASSERT_TRUE(fp != NULL);
180
181  char* buffer = NULL;
182  size_t buffer_length = 0;
183
184  // The first argument can't be NULL.
185  errno = 0;
186  ASSERT_EQ(getline(NULL, &buffer_length, fp), -1);
187  ASSERT_EQ(EINVAL, errno);
188
189  // The second argument can't be NULL.
190  errno = 0;
191  ASSERT_EQ(getline(&buffer, NULL, fp), -1);
192  ASSERT_EQ(EINVAL, errno);
193
194  // The underlying fd can't be closed.
195  ASSERT_EQ(0, close(fileno(fp)));
196  errno = 0;
197  ASSERT_EQ(getline(&buffer, &buffer_length, fp), -1);
198  ASSERT_EQ(EBADF, errno);
199  fclose(fp);
200}
201
202TEST(stdio, printf_ssize_t) {
203  // http://b/8253769
204  ASSERT_EQ(sizeof(ssize_t), sizeof(long int));
205  ASSERT_EQ(sizeof(ssize_t), sizeof(size_t));
206  // For our 32-bit ABI, we had a ssize_t definition that confuses GCC into saying:
207  // error: format '%zd' expects argument of type 'signed size_t',
208  //     but argument 4 has type 'ssize_t {aka long int}' [-Werror=format]
209  ssize_t v = 1;
210  char buf[32];
211  snprintf(buf, sizeof(buf), "%zd", v);
212}
213
214// https://code.google.com/p/android/issues/detail?id=64886
215TEST(stdio, snprintf_a) {
216  char buf[BUFSIZ];
217  EXPECT_EQ(23, snprintf(buf, sizeof(buf), "<%a>", 9990.235));
218  EXPECT_STREQ("<0x1.3831e147ae148p+13>", buf);
219}
220
221TEST(stdio, snprintf_lc) {
222  char buf[BUFSIZ];
223  wint_t wc = L'a';
224  EXPECT_EQ(3, snprintf(buf, sizeof(buf), "<%lc>", wc));
225  EXPECT_STREQ("<a>", buf);
226}
227
228TEST(stdio, snprintf_ls) {
229  char buf[BUFSIZ];
230  wchar_t* ws = NULL;
231  EXPECT_EQ(8, snprintf(buf, sizeof(buf), "<%ls>", ws));
232  EXPECT_STREQ("<(null)>", buf);
233
234  wchar_t chars[] = { L'h', L'i', 0 };
235  ws = chars;
236  EXPECT_EQ(4, snprintf(buf, sizeof(buf), "<%ls>", ws));
237  EXPECT_STREQ("<hi>", buf);
238}
239
240TEST(stdio, snprintf_n) {
241#if defined(__BIONIC__)
242  // http://b/14492135
243  char buf[32];
244  int i = 1234;
245  EXPECT_EQ(5, snprintf(buf, sizeof(buf), "a %n b", &i));
246  EXPECT_EQ(1234, i);
247  EXPECT_STREQ("a n b", buf);
248#else
249  GTEST_LOG_(INFO) << "This test does nothing.\n";
250#endif
251}
252
253TEST(stdio, snprintf_smoke) {
254  char buf[BUFSIZ];
255
256  snprintf(buf, sizeof(buf), "a");
257  EXPECT_STREQ("a", buf);
258
259  snprintf(buf, sizeof(buf), "%%");
260  EXPECT_STREQ("%", buf);
261
262  snprintf(buf, sizeof(buf), "01234");
263  EXPECT_STREQ("01234", buf);
264
265  snprintf(buf, sizeof(buf), "a%sb", "01234");
266  EXPECT_STREQ("a01234b", buf);
267
268  char* s = NULL;
269  snprintf(buf, sizeof(buf), "a%sb", s);
270  EXPECT_STREQ("a(null)b", buf);
271
272  snprintf(buf, sizeof(buf), "aa%scc", "bb");
273  EXPECT_STREQ("aabbcc", buf);
274
275  snprintf(buf, sizeof(buf), "a%cc", 'b');
276  EXPECT_STREQ("abc", buf);
277
278  snprintf(buf, sizeof(buf), "a%db", 1234);
279  EXPECT_STREQ("a1234b", buf);
280
281  snprintf(buf, sizeof(buf), "a%db", -8123);
282  EXPECT_STREQ("a-8123b", buf);
283
284  snprintf(buf, sizeof(buf), "a%hdb", static_cast<short>(0x7fff0010));
285  EXPECT_STREQ("a16b", buf);
286
287  snprintf(buf, sizeof(buf), "a%hhdb", static_cast<char>(0x7fffff10));
288  EXPECT_STREQ("a16b", buf);
289
290  snprintf(buf, sizeof(buf), "a%lldb", 0x1000000000LL);
291  EXPECT_STREQ("a68719476736b", buf);
292
293  snprintf(buf, sizeof(buf), "a%ldb", 70000L);
294  EXPECT_STREQ("a70000b", buf);
295
296  snprintf(buf, sizeof(buf), "a%pb", reinterpret_cast<void*>(0xb0001234));
297  EXPECT_STREQ("a0xb0001234b", buf);
298
299  snprintf(buf, sizeof(buf), "a%xz", 0x12ab);
300  EXPECT_STREQ("a12abz", buf);
301
302  snprintf(buf, sizeof(buf), "a%Xz", 0x12ab);
303  EXPECT_STREQ("a12ABz", buf);
304
305  snprintf(buf, sizeof(buf), "a%08xz", 0x123456);
306  EXPECT_STREQ("a00123456z", buf);
307
308  snprintf(buf, sizeof(buf), "a%5dz", 1234);
309  EXPECT_STREQ("a 1234z", buf);
310
311  snprintf(buf, sizeof(buf), "a%05dz", 1234);
312  EXPECT_STREQ("a01234z", buf);
313
314  snprintf(buf, sizeof(buf), "a%8dz", 1234);
315  EXPECT_STREQ("a    1234z", buf);
316
317  snprintf(buf, sizeof(buf), "a%-8dz", 1234);
318  EXPECT_STREQ("a1234    z", buf);
319
320  snprintf(buf, sizeof(buf), "A%-11sZ", "abcdef");
321  EXPECT_STREQ("Aabcdef     Z", buf);
322
323  snprintf(buf, sizeof(buf), "A%s:%dZ", "hello", 1234);
324  EXPECT_STREQ("Ahello:1234Z", buf);
325
326  snprintf(buf, sizeof(buf), "a%03d:%d:%02dz", 5, 5, 5);
327  EXPECT_STREQ("a005:5:05z", buf);
328
329  void* p = NULL;
330  snprintf(buf, sizeof(buf), "a%d,%pz", 5, p);
331#if defined(__BIONIC__)
332  EXPECT_STREQ("a5,0x0z", buf);
333#else // __BIONIC__
334  EXPECT_STREQ("a5,(nil)z", buf);
335#endif // __BIONIC__
336
337  snprintf(buf, sizeof(buf), "a%lld,%d,%d,%dz", 0x1000000000LL, 6, 7, 8);
338  EXPECT_STREQ("a68719476736,6,7,8z", buf);
339
340  snprintf(buf, sizeof(buf), "a_%f_b", 1.23f);
341  EXPECT_STREQ("a_1.230000_b", buf);
342
343  snprintf(buf, sizeof(buf), "a_%g_b", 3.14);
344  EXPECT_STREQ("a_3.14_b", buf);
345
346  snprintf(buf, sizeof(buf), "%1$s %1$s", "print_me_twice");
347  EXPECT_STREQ("print_me_twice print_me_twice", buf);
348}
349
350TEST(stdio, snprintf_f_special) {
351  char buf[BUFSIZ];
352  snprintf(buf, sizeof(buf), "%f", nanf(""));
353  EXPECT_STRCASEEQ("NaN", buf);
354
355  snprintf(buf, sizeof(buf), "%f", HUGE_VALF);
356  EXPECT_STRCASEEQ("Inf", buf);
357}
358
359TEST(stdio, snprintf_g_special) {
360  char buf[BUFSIZ];
361  snprintf(buf, sizeof(buf), "%g", nan(""));
362  EXPECT_STRCASEEQ("NaN", buf);
363
364  snprintf(buf, sizeof(buf), "%g", HUGE_VAL);
365  EXPECT_STRCASEEQ("Inf", buf);
366}
367
368TEST(stdio, snprintf_d_INT_MAX) {
369  char buf[BUFSIZ];
370  snprintf(buf, sizeof(buf), "%d", INT_MAX);
371  EXPECT_STREQ("2147483647", buf);
372}
373
374TEST(stdio, snprintf_d_INT_MIN) {
375  char buf[BUFSIZ];
376  snprintf(buf, sizeof(buf), "%d", INT_MIN);
377  EXPECT_STREQ("-2147483648", buf);
378}
379
380TEST(stdio, snprintf_ld_LONG_MAX) {
381  char buf[BUFSIZ];
382  snprintf(buf, sizeof(buf), "%ld", LONG_MAX);
383#if __LP64__
384  EXPECT_STREQ("9223372036854775807", buf);
385#else
386  EXPECT_STREQ("2147483647", buf);
387#endif
388}
389
390TEST(stdio, snprintf_ld_LONG_MIN) {
391  char buf[BUFSIZ];
392  snprintf(buf, sizeof(buf), "%ld", LONG_MIN);
393#if __LP64__
394  EXPECT_STREQ("-9223372036854775808", buf);
395#else
396  EXPECT_STREQ("-2147483648", buf);
397#endif
398}
399
400TEST(stdio, snprintf_lld_LLONG_MAX) {
401  char buf[BUFSIZ];
402  snprintf(buf, sizeof(buf), "%lld", LLONG_MAX);
403  EXPECT_STREQ("9223372036854775807", buf);
404}
405
406TEST(stdio, snprintf_lld_LLONG_MIN) {
407  char buf[BUFSIZ];
408  snprintf(buf, sizeof(buf), "%lld", LLONG_MIN);
409  EXPECT_STREQ("-9223372036854775808", buf);
410}
411
412TEST(stdio, snprintf_e) {
413  char buf[BUFSIZ];
414
415  snprintf(buf, sizeof(buf), "%e", 1.5);
416  EXPECT_STREQ("1.500000e+00", buf);
417
418  snprintf(buf, sizeof(buf), "%Le", 1.5l);
419  EXPECT_STREQ("1.500000e+00", buf);
420}
421
422TEST(stdio, snprintf_negative_zero_5084292) {
423  char buf[BUFSIZ];
424
425  snprintf(buf, sizeof(buf), "%f", -0.0);
426  EXPECT_STREQ("-0.000000", buf);
427}
428
429TEST(stdio, snprintf_utf8_15439554) {
430  // http://b/15439554
431  char buf[BUFSIZ];
432
433  // 1-byte character.
434  snprintf(buf, sizeof(buf), "%dx%d", 1, 2);
435  EXPECT_STREQ("1x2", buf);
436  // 2-byte character.
437  snprintf(buf, sizeof(buf), "%d\xc2\xa2%d", 1, 2);
438  EXPECT_STREQ("1¢2", buf);
439  // 3-byte character.
440  snprintf(buf, sizeof(buf), "%d\xe2\x82\xac%d", 1, 2);
441  EXPECT_STREQ("1€2", buf);
442  // 4-byte character.
443  snprintf(buf, sizeof(buf), "%d\xf0\xa4\xad\xa2%d", 1, 2);
444  EXPECT_STREQ("1��2", buf);
445}
446
447TEST(stdio, fprintf_failures_7229520) {
448  // http://b/7229520
449  FILE* fp;
450
451  // Unbuffered case where the fprintf(3) itself fails.
452  ASSERT_NE(nullptr, fp = tmpfile());
453  setbuf(fp, NULL);
454  ASSERT_EQ(4, fprintf(fp, "epic"));
455  ASSERT_EQ(0, close(fileno(fp)));
456  ASSERT_EQ(-1, fprintf(fp, "fail"));
457  ASSERT_EQ(-1, fclose(fp));
458
459  // Buffered case where we won't notice until the fclose(3).
460  // It's likely this is what was actually seen in http://b/7229520,
461  // and that expecting fprintf to fail is setting yourself up for
462  // disappointment. Remember to check fclose(3)'s return value, kids!
463  ASSERT_NE(nullptr, fp = tmpfile());
464  ASSERT_EQ(4, fprintf(fp, "epic"));
465  ASSERT_EQ(0, close(fileno(fp)));
466  ASSERT_EQ(4, fprintf(fp, "fail"));
467  ASSERT_EQ(-1, fclose(fp));
468}
469
470TEST(stdio, popen) {
471  FILE* fp = popen("cat /proc/version", "r");
472  ASSERT_TRUE(fp != NULL);
473
474  char buf[16];
475  char* s = fgets(buf, sizeof(buf), fp);
476  buf[13] = '\0';
477  ASSERT_STREQ("Linux version", s);
478
479  ASSERT_EQ(0, pclose(fp));
480}
481
482TEST(stdio, getc) {
483  FILE* fp = fopen("/proc/version", "r");
484  ASSERT_TRUE(fp != NULL);
485  ASSERT_EQ('L', getc(fp));
486  ASSERT_EQ('i', getc(fp));
487  ASSERT_EQ('n', getc(fp));
488  ASSERT_EQ('u', getc(fp));
489  ASSERT_EQ('x', getc(fp));
490  fclose(fp);
491}
492
493TEST(stdio, putc) {
494  FILE* fp = fopen("/proc/version", "r");
495  ASSERT_TRUE(fp != NULL);
496  ASSERT_EQ(EOF, putc('x', fp));
497  fclose(fp);
498}
499
500TEST(stdio, sscanf) {
501  char s1[123];
502  int i1;
503  double d1;
504  char s2[123];
505  ASSERT_EQ(3, sscanf("  hello 123 1.23 ", "%s %i %lf %s", s1, &i1, &d1, s2));
506  ASSERT_STREQ("hello", s1);
507  ASSERT_EQ(123, i1);
508  ASSERT_DOUBLE_EQ(1.23, d1);
509}
510
511TEST(stdio, cantwrite_EBADF) {
512  // If we open a file read-only...
513  FILE* fp = fopen("/proc/version", "r");
514
515  // ...all attempts to write to that file should return failure.
516
517  // They should also set errno to EBADF. This isn't POSIX, but it's traditional.
518  // glibc gets the wide-character functions wrong.
519
520  errno = 0;
521  EXPECT_EQ(EOF, putc('x', fp));
522  EXPECT_EQ(EBADF, errno);
523
524  errno = 0;
525  EXPECT_EQ(EOF, fprintf(fp, "hello"));
526  EXPECT_EQ(EBADF, errno);
527
528  errno = 0;
529  EXPECT_EQ(EOF, fwprintf(fp, L"hello"));
530#if defined(__BIONIC__)
531  EXPECT_EQ(EBADF, errno);
532#endif
533
534  errno = 0;
535  EXPECT_EQ(0U, fwrite("hello", 1, 2, fp));
536  EXPECT_EQ(EBADF, errno);
537
538  errno = 0;
539  EXPECT_EQ(EOF, fputs("hello", fp));
540  EXPECT_EQ(EBADF, errno);
541
542  errno = 0;
543  EXPECT_EQ(WEOF, fputwc(L'x', fp));
544#if defined(__BIONIC__)
545  EXPECT_EQ(EBADF, errno);
546#endif
547}
548
549// Tests that we can only have a consistent and correct fpos_t when using
550// f*pos functions (i.e. fpos doesn't get inside a multi byte character).
551TEST(stdio, consistent_fpos_t) {
552  ASSERT_STREQ("C.UTF-8", setlocale(LC_CTYPE, "C.UTF-8"));
553  uselocale(LC_GLOBAL_LOCALE);
554
555  FILE* fp = tmpfile();
556  ASSERT_TRUE(fp != NULL);
557
558  wchar_t mb_one_bytes = L'h';
559  wchar_t mb_two_bytes = 0x00a2;
560  wchar_t mb_three_bytes = 0x20ac;
561  wchar_t mb_four_bytes = 0x24b62;
562
563  // Write to file.
564  ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fputwc(mb_one_bytes, fp)));
565  ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fputwc(mb_two_bytes, fp)));
566  ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fputwc(mb_three_bytes, fp)));
567  ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fputwc(mb_four_bytes, fp)));
568
569  rewind(fp);
570
571  // Record each character position.
572  fpos_t pos1;
573  fpos_t pos2;
574  fpos_t pos3;
575  fpos_t pos4;
576  fpos_t pos5;
577  EXPECT_EQ(0, fgetpos(fp, &pos1));
578  ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fgetwc(fp)));
579  EXPECT_EQ(0, fgetpos(fp, &pos2));
580  ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp)));
581  EXPECT_EQ(0, fgetpos(fp, &pos3));
582  ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fgetwc(fp)));
583  EXPECT_EQ(0, fgetpos(fp, &pos4));
584  ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fgetwc(fp)));
585  EXPECT_EQ(0, fgetpos(fp, &pos5));
586
587#if defined(__BIONIC__)
588  // Bionic's fpos_t is just an alias for off_t. This is inherited from OpenBSD
589  // upstream. Glibc differs by storing the mbstate_t inside its fpos_t. In
590  // Bionic (and upstream OpenBSD) the mbstate_t is stored inside the FILE
591  // structure.
592  ASSERT_EQ(0, static_cast<off_t>(pos1));
593  ASSERT_EQ(1, static_cast<off_t>(pos2));
594  ASSERT_EQ(3, static_cast<off_t>(pos3));
595  ASSERT_EQ(6, static_cast<off_t>(pos4));
596  ASSERT_EQ(10, static_cast<off_t>(pos5));
597#endif
598
599  // Exercise back and forth movements of the position.
600  ASSERT_EQ(0, fsetpos(fp, &pos2));
601  ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp)));
602  ASSERT_EQ(0, fsetpos(fp, &pos1));
603  ASSERT_EQ(mb_one_bytes, static_cast<wchar_t>(fgetwc(fp)));
604  ASSERT_EQ(0, fsetpos(fp, &pos4));
605  ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fgetwc(fp)));
606  ASSERT_EQ(0, fsetpos(fp, &pos3));
607  ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fgetwc(fp)));
608  ASSERT_EQ(0, fsetpos(fp, &pos5));
609  ASSERT_EQ(WEOF, fgetwc(fp));
610
611  fclose(fp);
612}
613
614// Exercise the interaction between fpos and seek.
615TEST(stdio, fpos_t_and_seek) {
616  ASSERT_STREQ("C.UTF-8", setlocale(LC_CTYPE, "C.UTF-8"));
617  uselocale(LC_GLOBAL_LOCALE);
618
619  // In glibc-2.16 fseek doesn't work properly in wide mode
620  // (https://sourceware.org/bugzilla/show_bug.cgi?id=14543). One workaround is
621  // to close and re-open the file. We do it in order to make the test pass
622  // with all glibcs.
623
624  TemporaryFile tf;
625  FILE* fp = fdopen(tf.fd, "w+");
626  ASSERT_TRUE(fp != NULL);
627
628  wchar_t mb_two_bytes = 0x00a2;
629  wchar_t mb_three_bytes = 0x20ac;
630  wchar_t mb_four_bytes = 0x24b62;
631
632  // Write to file.
633  ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fputwc(mb_two_bytes, fp)));
634  ASSERT_EQ(mb_three_bytes, static_cast<wchar_t>(fputwc(mb_three_bytes, fp)));
635  ASSERT_EQ(mb_four_bytes, static_cast<wchar_t>(fputwc(mb_four_bytes, fp)));
636
637  fflush(fp);
638  fclose(fp);
639
640  fp = fopen(tf.filename, "r");
641  ASSERT_TRUE(fp != NULL);
642
643  // Store a valid position.
644  fpos_t mb_two_bytes_pos;
645  ASSERT_EQ(0, fgetpos(fp, &mb_two_bytes_pos));
646
647  // Move inside mb_four_bytes with fseek.
648  long offset_inside_mb = 6;
649  ASSERT_EQ(0, fseek(fp, offset_inside_mb, SEEK_SET));
650
651  // Store the "inside multi byte" position.
652  fpos_t pos_inside_mb;
653  ASSERT_EQ(0, fgetpos(fp, &pos_inside_mb));
654#if defined(__BIONIC__)
655  ASSERT_EQ(offset_inside_mb, static_cast<off_t>(pos_inside_mb));
656#endif
657
658  // Reading from within a byte should produce an error.
659  ASSERT_EQ(WEOF, fgetwc(fp));
660  ASSERT_EQ(EILSEQ, errno);
661
662  // Reverting to a valid position should work.
663  ASSERT_EQ(0, fsetpos(fp, &mb_two_bytes_pos));
664  ASSERT_EQ(mb_two_bytes, static_cast<wchar_t>(fgetwc(fp)));
665
666  // Moving withing a multi byte with fsetpos should work but reading should
667  // produce an error.
668  ASSERT_EQ(0, fsetpos(fp, &pos_inside_mb));
669  ASSERT_EQ(WEOF, fgetwc(fp));
670  ASSERT_EQ(EILSEQ, errno);
671
672  fclose(fp);
673}
674