87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/* Test case for bug with mmap stdio read past end of file. */
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#include <stdio.h>
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#include <error.h>
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#include <errno.h>
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static void do_prepare (void);
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#define PREPARE(argc, argv) do_prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include <test-skeleton.c>
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static char *temp_file;
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static const char text1[] = "hello\n";
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static void
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do_prepare (void)
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{
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int temp_fd = create_temp_file ("tst-mmap-offend.", &temp_file);
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if (temp_fd == -1)
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error (1, errno, "cannot create temporary file");
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else
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{
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ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
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if (cc != sizeof text1 - 1)
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error (1, errno, "cannot write to temporary file");
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}
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close (temp_fd);
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}
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static int
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do_test (void)
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{
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unsigned char buffer[8192];
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int result = 0;
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FILE *f = fopen (temp_file, "r");
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size_t cc;
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if (f == NULL)
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{
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perror (temp_file);
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return 1;
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}
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cc = fread (buffer, 1, sizeof (buffer), f);
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printf ("fread %zu: \"%.*s\"\n", cc, (int) cc, buffer);
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if (cc != sizeof text1 - 1)
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{
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perror ("fread");
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result = 1;
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}
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if (fseek (f, 2048, SEEK_SET) != 0)
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{
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perror ("fseek off end");
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result = 1;
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}
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if (fread (buffer, 1, sizeof (buffer), f) != 0
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|| ferror (f) || !feof (f))
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{
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printf ("after fread error %d eof %d\n",
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ferror (f), feof (f));
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result = 1;
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}
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printf ("ftell %ld\n", ftell (f));
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if (fseek (f, 0, SEEK_SET) != 0)
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{
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perror ("fseek rewind");
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result = 1;
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}
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cc = fread (buffer, 1, sizeof (buffer), f);
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printf ("fread after rewind %zu: \"%.*s\"\n", cc, (int) cc, buffer);
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if (cc != sizeof text1 - 1)
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{
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perror ("fread after rewind");
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result = 1;
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}
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fclose (f);
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return result;
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}
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