stdio-common/tst-cookie.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <fcntl.h>
   4 #include <errno.h>
   5
   6 #include <stdio.h>
   7
   8
   9 #define THE_COOKIE ((void *) 0xdeadbeeful)
  10
  11 static int errors;
  12
  13
  14 static int cookieread_called;
  15 static ssize_t
  16 cookieread (void *cookie, char *buf, size_t count)
  17 {
  18   printf ("`%s' called with cookie %#lx\n", __FUNCTION__,
  19           (unsigned long int) cookie);
  20   if (cookie != THE_COOKIE)
  21     ++errors;
  22   cookieread_called = 1;
  23   return 42;
  24 }
  25
  26
  27 static int cookiewrite_called;
  28 static ssize_t
  29 cookiewrite (void *cookie, const char *buf, size_t count)
  30 {
  31   printf ("`%s' called with cookie %#lx\n", __FUNCTION__,
  32           (unsigned long int) cookie);
  33   if (cookie != THE_COOKIE)
  34     ++errors;
  35   cookiewrite_called = 1;
  36   return 43;
  37 }
  38
  39
  40 static int cookieseek_called;
  41 static int
  42 cookieseek (void *cookie, off_t offset, int whence)
  43 {
  44   printf ("`%s' called with cookie %#lx\n", __FUNCTION__,
  45           (unsigned long int) cookie);
  46   if (cookie != THE_COOKIE)
  47     ++errors;
  48   cookieseek_called = 1;
  49   return 44;
  50 }
  51
  52
  53 static int cookieclose_called;
  54 static int
  55 cookieclose (void *cookie)
  56 {
  57   printf ("`%s' called with cookie %#lx\n", __FUNCTION__,
  58           (unsigned long int) cookie);
  59   if (cookie != THE_COOKIE)
  60     ++errors;
  61   cookieclose_called = 1;
  62   return 45;
  63 }
  64
  65
  66 int
  67 main (void)
  68 {
  69   cookie_io_functions_t fcts;
  70   char buf[1];
  71   FILE *f;
  72
  73   fcts.read = cookieread;
  74   fcts.seek = cookieseek;
  75   fcts.close = cookieclose;
  76   fcts.write = cookiewrite;
  77
  78   f = fopencookie (THE_COOKIE, "r+", fcts);
  79
  80   fread (buf, 1, 1, f);
  81   fwrite (buf, 1, 1, f);
  82   fseek (f, 0, SEEK_CUR);
  83   fclose (f);
  84
  85   if (cookieread_called == 0
  86       || cookiewrite_called == 0
  87       || cookieseek_called == 0
  88       || cookieclose_called == 0)
  89     ++errors;
  90
  91   return errors != 0;
  92 }