1  #include <stdio.h>
       2  #include <stdlib.h>
       3  #include <string.h>
       4  #include <sys/resource.h>
       5  
       6  #define LIMIT 1000000
       7  
       8  int
       9  main (void)
      10  {
      11    struct rlimit lim;
      12    getrlimit (RLIMIT_STACK, &lim);
      13    lim.rlim_cur = 1048576;
      14    setrlimit (RLIMIT_STACK, &lim);
      15    char *fmtstr = malloc (4 * LIMIT + 1);
      16    if (fmtstr == NULL)
      17      abort ();
      18    char *output = malloc (LIMIT + 1);
      19    if (output == NULL)
      20      abort ();
      21    for (size_t i = 0; i < LIMIT; i++)
      22      memcpy (fmtstr + 4 * i, "%1$d", 4);
      23    fmtstr[4 * LIMIT] = '\0';
      24    int ret = snprintf (output, LIMIT + 1, fmtstr, 0);
      25    if (ret != LIMIT)
      26      abort ();
      27    for (size_t i = 0; i < LIMIT; i++)
      28      if (output[i] != '0')
      29        abort ();
      30    return 0;
      31  }