libio/tst-ext.c

   1 #include <stdio_ext.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5
   6 int
   7 main (void)
   8 {
   9   FILE *fp;
  10   const char teststring[] = "hello world";
  11   char buf[3072];
  12   int result = 0;
  13   char readbuf[256];
  14
  15   /* Open a file.  */
  16   fp = tmpfile ();
  17
  18   /* Set a buffer.  */
  19   if (setvbuf (fp, buf, _IOFBF, sizeof buf) == EOF)
  20     {
  21       printf ("setvbuf failed: %m\n");
  22       exit (1);
  23     }
  24
  25   /* Get the buffer size.  */
  26   if (__fbufsize (fp) != sizeof buf)
  27     {
  28       printf ("__fbusize() reported a buffer size of %Zd bytes;"
  29               " we installed a buffer with %Zd bytes\n",
  30               __fbufsize (fp), sizeof buf);
  31       result = 1;
  32     }
  33
  34   /* Write something and read it back.  */
  35   if (fputs (teststring, fp) == EOF)
  36     {
  37       printf ("writing to new stream failed: %m\n");
  38       exit (1);
  39     }
  40   rewind (fp);
  41   if (fgets (readbuf, sizeof readbuf, fp) == NULL)
  42     {
  43       printf ("reading from new stream failed: %m\n");
  44       exit (1);
  45     }
  46   if (strcmp (readbuf, teststring) != 0)
  47     {
  48       puts ("not the correct string read");
  49       exit (1);
  50     }
  51
  52   /* The file must be opened for reading and writing.  */
  53   if (__freading (fp) == 0)
  54     {
  55       puts ("__freading() reported stream is not last read from");
  56       result = 1;
  57     }
  58   if (__fwriting (fp) != 0)
  59     {
  60       puts ("__fwriting() reported stream is write-only or last written to");
  61       result = 1;
  62     }
  63   rewind (fp);
  64   if (fputs (teststring, fp) == EOF)
  65     {
  66       printf ("writing(2) to new stream failed: %m\n");
  67       exit (1);
  68     }
  69   if (__fwriting (fp) == 0)
  70     {
  71       puts ("__fwriting() doe snot reported stream is last written to");
  72       result = 1;
  73     }
  74   if (__freading (fp) != 0)
  75     {
  76       puts ("__freading() reported stream is last read from");
  77       result = 1;
  78     }
  79
  80   if (__freadable (fp) == 0)
  81     {
  82       puts ("__freading() reported stream is last readable");
  83       result = 1;
  84     }
  85   if (__fwritable (fp) == 0)
  86     {
  87       puts ("__freading() reported stream is last writable");
  88       result = 1;
  89     }
  90
  91   /* The string we wrote above should still be in the buffer.  */
  92   if (__fpending (fp) != strlen (teststring))
  93     {
  94       printf ("__fpending() returned %Zd; expected %Zd\n",
  95               __fpending (fp), strlen (teststring));
  96       result = 1;
  97     }
  98   /* Discard all the output.  */
  99   __fpurge (fp);
 100   /* And check again.  */
 101   if (__fpending (fp) != 0)
 102     {
 103       printf ("__fpending() returned %Zd; expected 0\n",
 104               __fpending (fp));
 105       result = 1;
 106     }
 107
 108
 109   /* Find out whether buffer is line buffered.  */
 110   if (__flbf (fp) != 0)
 111     {
 112       puts ("__flbf() reports line buffered but it is fully buffered");
 113       result = 1;
 114     }
 115
 116   if (setvbuf (fp, buf, _IOLBF, sizeof buf) == EOF)
 117     {
 118       printf ("setvbuf(2) failed: %m\n");
 119       exit (1);
 120     }
 121   if (__flbf (fp) == 0)
 122     {
 123       puts ("__flbf() reports file is not line buffered");
 124       result = 1;
 125     }
 126
 127   if (setvbuf (fp, NULL, _IONBF, 0) == EOF)
 128     {
 129       printf ("setvbuf(3) failed: %m\n");
 130       exit (1);
 131     }
 132   if (__flbf (fp) != 0)
 133     {
 134       puts ("__flbf() reports line buffered but it is not buffered");
 135       result = 1;
 136     }
 137
 138   fclose (fp);
 139
 140   return result;
 141 }