stdio-common/test-fwrite.c

   1 #include <stdio.h>
   2 #include <string.h>
   3
   4 int
   5 main ()
   6 {
   7   FILE *f = tmpfile ();
   8   char obuf[99999], ibuf[sizeof obuf];
   9   char *line;
  10   size_t linesz;
  11
  12   if (! f)
  13     {
  14       perror ("tmpfile");
  15       return 1;
  16     }
  17
  18   if (fputs ("line\n", f) == EOF)
  19     {
  20       perror ("fputs");
  21       return 1;
  22     }
  23
  24   memset (obuf, 'z', sizeof obuf);
  25   memset (ibuf, 'y', sizeof ibuf);
  26
  27   if (fwrite (obuf, sizeof obuf, 1, f) != 1)
  28     {
  29       perror ("fwrite");
  30       return 1;
  31     }
  32
  33   rewind (f);
  34
  35   line = NULL;
  36   linesz = 0;
  37   if (getline (&line, &linesz, f) != 5)
  38     {
  39       perror ("getline");
  40       return 1;
  41     }
  42   if (strcmp (line, "line\n"))
  43     {
  44       puts ("Lines differ.  Test FAILED!");
  45       return 1;
  46     }
  47
  48   if (fread (ibuf, sizeof ibuf, 1, f) != 1)
  49     {
  50       perror ("fread");
  51       return 1;
  52     }
  53
  54   if (memcmp (ibuf, obuf, sizeof ibuf))
  55     {
  56       puts ("Buffers differ.  Test FAILED!");
  57       return 1;
  58     }
  59
  60   asprintf (&line, "\
  61 GDB is free software and you are welcome to distribute copies of it\n\
  62  under certain conditions; type \"show copying\" to see the conditions.\n\
  63 There is absolutely no warranty for GDB; type \"show warranty\" for details.\n\
  64 ");
  65
  66   puts ("Test succeeded.");
  67   return 0;
  68 }