Blame libio/bug-memstream1.c

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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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static int
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do_test (void)
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{
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  size_t size;
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  char *buf;
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  FILE *fp = open_memstream (&buf, &size);
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  if (fp == NULL)
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    {
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      puts ("open_memstream failed");
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      return 1;
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    }
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  off64_t off = ftello64 (fp);
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  if (off != 0)
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    {
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      puts ("initial position wrong");
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      return 1;
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    }
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  if (fseek (fp, 32768, SEEK_SET) != 0)
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    {
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      puts ("fseek failed");
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      return 1;
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    }
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  if (fputs ("foo", fp) == EOF)
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    {
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      puts ("fputs failed");
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      return 1;
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    }
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  if (fclose (fp) == EOF)
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    {
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      puts ("fclose failed");
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      return 1;
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    }
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  if (size != 32768 + 3)
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    {
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      printf ("expected size %d, got %zu\n", 32768 + 3, size);
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      return 1;
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    }
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  for (int i = 0; i < 32768; ++i)
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    if (buf[i] != '\0')
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      {
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	printf ("byte at offset %d is %#hhx\n", i, buf[i]);
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	return 1;
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      }
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  if (memcmp (buf + 32768, "foo", 3) != 0)
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    {
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      puts ("written string incorrect");
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      return 1;
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    }
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  /* Mark the buffer.  */
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  memset (buf, 'A', size);
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  free (buf);
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  /* Try again, this time with write mode enabled before the seek.  */
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  fp = open_memstream (&buf, &size);
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  if (fp == NULL)
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    {
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      puts ("2nd open_memstream failed");
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      return 1;
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    }
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  off = ftello64 (fp);
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  if (off != 0)
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    {
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      puts ("2nd initial position wrong");
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      return 1;
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    }
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  if (fputs ("bar", fp) == EOF)
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    {
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      puts ("2nd fputs failed");
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      return 1;
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    }
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  if (fseek (fp, 32768, SEEK_SET) != 0)
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    {
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      puts ("2nd fseek failed");
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      return 1;
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    }
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  if (fputs ("foo", fp) == EOF)
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    {
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      puts ("3rd fputs failed");
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      return 1;
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    }
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  if (fclose (fp) == EOF)
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    {
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      puts ("2nd fclose failed");
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      return 1;
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    }
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  if (size != 32768 + 3)
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    {
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      printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
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      return 1;
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    }
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  if (memcmp (buf, "bar", 3) != 0)
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    {
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      puts ("initial string incorrect in 2nd try");
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      return 1;
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    }
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  for (int i = 3; i < 32768; ++i)
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    if (buf[i] != '\0')
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      {
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	printf ("byte at offset %d is %#hhx in 2nd try\n", i, buf[i]);
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	return 1;
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      }
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  if (memcmp (buf + 32768, "foo", 3) != 0)
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    {
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      puts ("written string incorrect in 2nd try");
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      return 1;
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    }
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  return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"