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#include <stdio.h>
#include <string.h>
static int
do_test (void)
{
size_t size;
char *buf;
FILE *fp = open_memstream (&buf, &size);
if (fp == NULL)
{
puts ("open_memstream failed");
return 1;
}
off64_t off = ftello64 (fp);
if (off != 0)
{
puts ("initial position wrong");
return 1;
}
if (fseek (fp, 32768, SEEK_SET) != 0)
{
puts ("fseek failed");
return 1;
}
if (fputs ("foo", fp) == EOF)
{
puts ("fputs failed");
return 1;
}
if (fclose (fp) == EOF)
{
puts ("fclose failed");
return 1;
}
if (size != 32768 + 3)
{
printf ("expected size %d, got %zu\n", 32768 + 3, size);
return 1;
}
for (int i = 0; i < 32768; ++i)
if (buf[i] != '\0')
{
printf ("byte at offset %d is %#hhx\n", i, buf[i]);
return 1;
}
if (memcmp (buf + 32768, "foo", 3) != 0)
{
puts ("written string incorrect");
return 1;
}
/* Mark the buffer. */
memset (buf, 'A', size);
free (buf);
/* Try again, this time with write mode enabled before the seek. */
fp = open_memstream (&buf, &size);
if (fp == NULL)
{
puts ("2nd open_memstream failed");
return 1;
}
off = ftello64 (fp);
if (off != 0)
{
puts ("2nd initial position wrong");
return 1;
}
if (fputs ("bar", fp) == EOF)
{
puts ("2nd fputs failed");
return 1;
}
if (fseek (fp, 32768, SEEK_SET) != 0)
{
puts ("2nd fseek failed");
return 1;
}
if (fputs ("foo", fp) == EOF)
{
puts ("3rd fputs failed");
return 1;
}
if (fclose (fp) == EOF)
{
puts ("2nd fclose failed");
return 1;
}
if (size != 32768 + 3)
{
printf ("2nd expected size %d, got %zu\n", 32768 + 3, size);
return 1;
}
if (memcmp (buf, "bar", 3) != 0)
{
puts ("initial string incorrect in 2nd try");
return 1;
}
for (int i = 3; i < 32768; ++i)
if (buf[i] != '\0')
{
printf ("byte at offset %d is %#hhx in 2nd try\n", i, buf[i]);
return 1;
}
if (memcmp (buf + 32768, "foo", 3) != 0)
{
puts ("written string incorrect in 2nd try");
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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