1  #include <stdio.h>
       2  #include <stdlib.h>
       3  #include <string.h>
       4  
       5  int
       6  main (void)
       7  {
       8    char *bp;
       9    size_t size;
      10    FILE *stream;
      11    int lose = 0;
      12  
      13    stream = open_memstream (&bp, &size);
      14    fprintf (stream, "hello");
      15    fflush (stream);
      16    printf ("buf = %s, size = %Zu\n", bp, size);
      17    lose |= size != 5;
      18    lose |= strncmp (bp, "hello", size);
      19    fprintf (stream, ", world");
      20    fclose (stream);
      21    printf ("buf = %s, size = %Zu\n", bp, size);
      22    lose |= size != 12;
      23    lose |= strncmp (bp, "hello, world", 12);
      24  
      25    puts (lose ? "Test FAILED!" : "Test succeeded.");
      26  
      27    free (bp);
      28  
      29    return lose;
      30  }