libio/bug-fopena+.c

   1 #include <fcntl.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5
   6 static int fd;
   7 static char *fname;
   8
   9
  10 static void prepare (void);
  11 #define PREPARE(argc, argv) prepare ()
  12
  13
  14 #define TEST_FUNCTION do_test ()
  15 static int do_test (void);
  16 #include "../test-skeleton.c"
  17
  18
  19 static void
  20 prepare (void)
  21 {
  22   fd = create_temp_file ("wrewind.", &fname);
  23   if (fd == -1)
  24     exit (3);
  25 }
  26
  27
  28 static int
  29 do_test (void)
  30 {
  31   char buf[100];
  32   FILE *fp;
  33   int result = 0;
  34
  35   fp = fdopen (fd, "w");
  36   if (fp == NULL)
  37     {
  38       puts ("cannot create file");
  39       exit (1);
  40     }
  41
  42   if (fputs ("one\n", fp) == EOF || fputs ("two\n", fp) == EOF)
  43     {
  44       puts ("cannot create filec content");
  45       exit (1);
  46     }
  47
  48   fclose (fp);
  49
  50   fp = fopen (fname, "a+");
  51   if (fp == NULL)
  52     {
  53       puts ("cannot fopen a+");
  54       exit (1);
  55     }
  56
  57   if (fgets (buf, sizeof (buf), fp) == NULL)
  58     {
  59       puts ("cannot read after fopen a+");
  60       exit (1);
  61     }
  62
  63   if (strcmp (buf, "one\n") != 0)
  64     {
  65       puts ("read after fopen a+ produced wrong result");
  66       result = 1;
  67     }
  68
  69   fclose (fp);
  70
  71   fd = open (fname, O_RDWR);
  72   if (fd == -1)
  73     {
  74       puts ("open failed");
  75       exit (1);
  76     }
  77
  78   fp = fdopen (fd, "a+");
  79   if (fp == NULL)
  80     {
  81       puts ("fopen after open failed");
  82       exit (1);
  83     }
  84
  85   if (fgets (buf, sizeof (buf), fp) == NULL)
  86     {
  87       puts ("cannot read after fdopen a+");
  88       exit (1);
  89     }
  90
  91   if (strcmp (buf, "one\n") != 0)
  92     {
  93       puts ("read after fdopen a+ produced wrong result");
  94       result = 1;
  95     }
  96
  97   fclose (fp);
  98
  99   return result;
 100 }