libio/bug-memstream1.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4
   5
   6 static int
   7 do_test (void)
   8 {
   9   size_t size;
  10   char *buf;
  11   FILE *fp = open_memstream (&buf, &size);
  12   if (fp == NULL)
  13     {
  14       puts ("open_memstream failed");
  15       return 1;
  16     }
  17
  18   off64_t off = ftello64 (fp);
  19   if (off != 0)
  20     {
  21       puts ("initial position wrong");
  22       return 1;
  23     }
  24
  25   if (fseek (fp, 32768, SEEK_SET) != 0)
  26     {
  27       puts ("fseek failed");
  28       return 1;
  29     }
  30
  31   if (fputs ("foo", fp) == EOF)
  32     {
  33       puts ("fputs failed");
  34       return 1;
  35     }
  36
  37   if (fclose (fp) == EOF)
  38     {
  39       puts ("fclose failed");
  40       return 1;
  41     }
  42
  43   if (size != 32768 + 3)
  44     {
  45       printf ("expected size %d, got %zu\n", 32768 + 3, size);
  46       return 1;
  47     }
  48
  49   for (int i = 0; i < 32768; ++i)
  50     if (buf[i] != '\0')
  51       {
  52         printf ("byte at offset %d is %#hhx\n", i, buf[i]);
  53         return 1;
  54       }
  55
  56   if (memcmp (buf + 32768, "foo", 3) != 0)
  57     {
  58       puts ("written string incorrect");
  59       return 1;
  60     }
  61
  62   /* Mark the buffer.  */
  63   memset (buf, 'A', size);
  64   free (buf);
  65
  66   /* Try again, this time with write mode enabled before the seek.  */
  67   fp = open_memstream (&buf, &size);
  68   if (fp == NULL)
  69     {
  70       puts ("2nd open_memstream failed");
  71       return 1;
  72     }
  73
  74   off = ftello64 (fp);
  75   if (off != 0)
  76     {
  77       puts ("2nd initial position wrong");
  78       return 1;
  79     }
  80
  81   if (fputs ("bar", fp) == EOF)
  82     {
  83       puts ("2nd fputs failed");
  84       return 1;
  85     }
  86
  87   if (fseek (fp, 32768, SEEK_SET) != 0)
  88     {
  89       puts ("2nd fseek failed");
  90       return 1;
  91     }
  92
  93   if (fputs ("foo", fp) == EOF)
  94     {
  95       puts ("3rd fputs failed");
  96       return 1;
  97     }
  98
  99   if (fclose (fp) == EOF)
 100     {
 101       puts ("2nd fclose failed");
 102       return 1;
 103     }
 104
 105   if (size != 32768 + 3)
 106     {
 107       printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
 108       return 1;
 109     }
 110
 111   if (memcmp (buf, "bar", 3) != 0)
 112     {
 113       puts ("initial string incorrect in 2nd try");
 114       return 1;
 115     }
 116
 117   for (int i = 3; i < 32768; ++i)
 118     if (buf[i] != '\0')
 119       {
 120         printf ("byte at offset %d is %#hhx in 2nd try\n", i, buf[i]);
 121         return 1;
 122       }
 123
 124   if (memcmp (buf + 32768, "foo", 3) != 0)
 125     {
 126       puts ("written string incorrect in 2nd try");
 127       return 1;
 128     }
 129
 130   return 0;
 131 }
 132
 133 #define TEST_FUNCTION do_test ()
 134 #include "../test-skeleton.c"