lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Test case for bug with mmap stdio read past end of file. */ |
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <error.h> |
| 5 | #include <errno.h> |
| 6 | |
| 7 | static void do_prepare (void); |
| 8 | #define PREPARE(argc, argv) do_prepare () |
| 9 | static int do_test (void); |
| 10 | #define TEST_FUNCTION do_test () |
| 11 | #include <test-skeleton.c> |
| 12 | |
| 13 | static char *temp_file; |
| 14 | |
| 15 | static const char text1[] = "hello\n"; |
| 16 | |
| 17 | static void |
| 18 | do_prepare (void) |
| 19 | { |
| 20 | int temp_fd = create_temp_file ("tst-mmap-offend.", &temp_file); |
| 21 | if (temp_fd == -1) |
| 22 | error (1, errno, "cannot create temporary file"); |
| 23 | else |
| 24 | { |
| 25 | ssize_t cc = write (temp_fd, text1, sizeof text1 - 1); |
| 26 | if (cc != sizeof text1 - 1) |
| 27 | error (1, errno, "cannot write to temporary file"); |
| 28 | } |
| 29 | close (temp_fd); |
| 30 | } |
| 31 | |
| 32 | static int |
| 33 | do_test (void) |
| 34 | { |
| 35 | unsigned char buffer[8192]; |
| 36 | int result = 0; |
| 37 | FILE *f = fopen (temp_file, "rm"); |
| 38 | size_t cc; |
| 39 | |
| 40 | if (f == NULL) |
| 41 | { |
| 42 | perror (temp_file); |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | cc = fread (buffer, 1, sizeof (buffer), f); |
| 47 | printf ("fread %zu: \"%.*s\"\n", cc, (int) cc, buffer); |
| 48 | if (cc != sizeof text1 - 1) |
| 49 | { |
| 50 | perror ("fread"); |
| 51 | result = 1; |
| 52 | } |
| 53 | |
| 54 | if (fseek (f, 2048, SEEK_SET) != 0) |
| 55 | { |
| 56 | perror ("fseek off end"); |
| 57 | result = 1; |
| 58 | } |
| 59 | |
| 60 | if (fread (buffer, 1, sizeof (buffer), f) != 0 |
| 61 | || ferror (f) || !feof (f)) |
| 62 | { |
| 63 | printf ("after fread error %d eof %d\n", |
| 64 | ferror (f), feof (f)); |
| 65 | result = 1; |
| 66 | } |
| 67 | |
| 68 | printf ("ftell %ld\n", ftell (f)); |
| 69 | |
| 70 | if (fseek (f, 0, SEEK_SET) != 0) |
| 71 | { |
| 72 | perror ("fseek rewind"); |
| 73 | result = 1; |
| 74 | } |
| 75 | |
| 76 | cc = fread (buffer, 1, sizeof (buffer), f); |
| 77 | printf ("fread after rewind %zu: \"%.*s\"\n", cc, (int) cc, buffer); |
| 78 | if (cc != sizeof text1 - 1) |
| 79 | { |
| 80 | perror ("fread after rewind"); |
| 81 | result = 1; |
| 82 | } |
| 83 | |
| 84 | fclose (f); |
| 85 | return result; |
| 86 | } |