95 lines
1.6 KiB
C
95 lines
1.6 KiB
C
/* Test program for ungetc/ftell interaction bug. */
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#include <stdio.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 const char pattern[] = "12345";
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static char *temp_file;
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static void
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do_prepare (void)
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{
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int fd = create_temp_file ("bug-ungetc.", &temp_file);
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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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write (fd, pattern, sizeof (pattern));
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close (fd);
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}
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static int
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do_one_test (int mode)
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{
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FILE *f;
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f = fopen (temp_file, "r");
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if (f == NULL)
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{
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printf ("could not open temporary file: %m\n");
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return 1;
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}
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if (mode == 1 && ftell (f) != 0)
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{
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printf ("first ftell returned wrong position %ld\n", ftell (f));
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return 1;
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}
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if (fgetc (f) != '1' || fgetc (f) != '2')
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{
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puts ("fgetc failed");
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return 1;
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}
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if (mode == 2 && ftell (f) != 2)
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{
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printf ("second ftell returned wrong position %ld\n", ftell (f));
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return 1;
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}
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if (ungetc ('6', f) != '6')
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{
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puts ("ungetc failed");
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return 1;
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}
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if (ftell (f) != 1)
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{
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printf ("third ftell returned wrong position %ld\n", ftell (f));
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return 1;
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}
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if (fgetc (f) != '6')
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{
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puts ("fgetc failed");
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return 1;
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}
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if (ftell (f) != 2)
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{
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printf ("fourth ftell returned wrong position %ld\n", ftell (f));
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return 1;
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}
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fclose (f);
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return 0;
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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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int mode;
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for (mode = 0; mode <= 2; mode++)
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if (do_one_test (mode))
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return 1;
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return 0;
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}
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