libio/bug-ungetc2.c

   1 #include <stdio.h>
   2 #include <sys/types.h>
   3
   4
   5 static int
   6 check (FILE *fp, off_t o)
   7 {
   8   int result = 0;
   9   if (feof (fp))
  10     {
  11       puts ("feof !");
  12       result = 1;
  13     }
  14   if (ferror (fp))
  15     {
  16       puts ("ferror !");
  17       result = 1;
  18     }
  19   if (ftello (fp) != o)
  20     {
  21       printf ("position = %lu, not %lu\n", (unsigned long int) ftello (fp),
  22               (unsigned long int) o);
  23       result = 1;
  24     }
  25   return result;
  26 }
  27
  28
  29 static int
  30 do_test (void)
  31 {
  32   FILE *fp = tmpfile ();
  33   if (fp == NULL)
  34     {
  35       puts ("tmpfile failed");
  36       return 1;
  37     }
  38   if (check (fp, 0) != 0)
  39     return 1;
  40
  41   puts ("going to write");
  42   if (fputs ("hello", fp) == EOF)
  43     {
  44       puts ("fputs failed");
  45       return 1;
  46     }
  47   if (check (fp, 5) != 0)
  48     return 1;
  49
  50   puts ("going to rewind");
  51   rewind (fp);
  52   if (check (fp, 0) != 0)
  53     return 1;
  54
  55   puts ("going to read char");
  56   int c = fgetc (fp);
  57   if (c != 'h')
  58     {
  59       printf ("read %c, not %c\n", c, 'h');
  60       return 1;
  61     }
  62   if (check (fp, 1) != 0)
  63     return 1;
  64
  65   puts ("going to put back");
  66   if (ungetc (' ', fp) == EOF)
  67     {
  68       puts ("ungetc failed");
  69       return 1;
  70     }
  71   if (check (fp, 0) != 0)
  72     return 1;
  73
  74   puts ("going to write again");
  75   if (fputs ("world", fp) == EOF)
  76     {
  77       puts ("2nd fputs failed");
  78       return 1;
  79     }
  80   if (check (fp, 5) != 0)
  81     return 1;
  82
  83   puts ("going to rewind again");
  84   rewind (fp);
  85   if (check (fp, 0) != 0)
  86     return 1;
  87
  88   if (fclose (fp) != 0)
  89     {
  90       puts ("fclose failed");
  91       return 1;
  92     }
  93
  94   return 0;
  95 }
  96
  97 #define TEST_FUNCTION do_test ()
  98 #include "../test-skeleton.c"