50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/* Check for a sim bug, whereby the position was always unsigned
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(truncation instead of sign-extension for 64-bit hosts). */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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int
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main (void)
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{
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FILE *f;
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const char fname[] = "sk1test.dat";
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const char tsttxt[]
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= "A random line of text, used to test correct read, write and seek.\n";
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char buf[sizeof tsttxt] = "";
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const char correct[] = "correct";
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char buf2[sizeof correct] = {0};
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int fd;
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f = fopen (fname, "wb");
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if (f == NULL
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|| fwrite (tsttxt, 1, strlen (tsttxt), f) != strlen (tsttxt)
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|| fclose (f) != 0)
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{
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printf ("fail\n");
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exit (1);
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}
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/* We have to use file-descriptor calls instead of stream calls to
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provoke the bug (for stream calls, the lseek call is canonicalized
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to use SEEK_SET). */
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fd = open (fname, O_RDONLY);
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if (fd < 0
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|| read (fd, buf, strlen (tsttxt)) != strlen (tsttxt)
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|| strcmp (buf, tsttxt) != 0
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|| lseek (fd, -30L, SEEK_CUR) != 36
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|| read (fd, buf2, strlen (correct)) != strlen (correct)
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|| strcmp (buf2, correct) != 0)
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{
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printf ("fail\n");
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exit (1);
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}
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printf ("pass\n");
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exit (0);
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}
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