124 lines
2.1 KiB
C
124 lines
2.1 KiB
C
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static char *fname;
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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 void
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do_prepare (void)
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{
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static const char pattern[] = "12345678901234567890";
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int fd = create_temp_file ("bug-fseek.", &fname);
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if (fd == -1)
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{
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printf ("cannot create temporary file: %m\n");
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exit (1);
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}
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if (write (fd, pattern, sizeof (pattern)) != sizeof (pattern))
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{
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perror ("short write");
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abort ();
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}
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close (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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FILE *f;
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int result = 0;
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char buf[10];
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if ((f = fopen (fname, "r")) == (FILE *) NULL)
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{
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perror ("fopen(\"r\")");
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}
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fread (buf, 3, 1, f);
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errno = 0;
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if (fseek (f, -10, SEEK_CUR) == 0)
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{
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printf ("fseek() for r to before start of file worked!\n");
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result = 1;
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}
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else if (errno != EINVAL)
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{
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printf ("\
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fseek() for r to before start of file did not set errno to EINVAL. \
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Got %d instead\n",
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errno);
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result = 1;
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}
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fclose (f);
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if ((f = fopen (fname, "r+")) == (FILE *) NULL)
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{
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perror ("fopen(\"r+\")");
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}
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fread (buf, 3, 1, f);
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errno = 0;
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if (fseek (f, -10, SEEK_CUR) == 0)
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{
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printf ("fseek() for r+ to before start of file worked!\n");
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result = 1;
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}
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else if (errno != EINVAL)
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{
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printf ("\
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fseek() for r+ to before start of file did not set errno to EINVAL. \
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Got %d instead\n",
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errno);
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result = 1;
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}
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fclose (f);
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if ((f = fopen (fname, "r+")) == (FILE *) NULL)
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{
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perror ("fopen(\"r+\")");
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}
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fread (buf, 3, 1, f);
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if (ftell (f) != 3)
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{
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puts ("ftell failed");
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return 1;
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}
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errno = 0;
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if (fseek (f, -10, SEEK_CUR) == 0)
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{
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printf ("fseek() for r+ to before start of file worked!\n");
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result = 1;
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}
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else if (errno != EINVAL)
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{
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printf ("\
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fseek() for r+ to before start of file did not set errno to EINVAL. \
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Got %d instead\n",
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errno);
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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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