#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void usage (void) __attribute__ ((unused));

int
main (int argc, char *argv[], char *envp[])
{
  if (argc < 3)
    {
      usage();
      return EXIT_FAILURE;
    }

  int i = 1;
  while (i < argc)
    {
      char *endptr;
      long count = strtol (argv[i], &endptr, 10);
      if (*endptr != '\0' || count <= 0)
        {
          usage();
          return EXIT_FAILURE;
        }
      i++;

      if (i >= argc)
        {
          usage();
          return EXIT_FAILURE;
        }

      char *var = argv[i];
      char *val = NULL;
      int x = 0;
      while (envp[x] != NULL)
        {
          if (strstr(envp[x], var) == envp[x])
            {
              val = envp[x];
              break;
            }
          x++;
        }

      if (val == NULL)
        {
          val = "";
          for (long j = 0; j < count; j++)
            {
              printf("%s=%s\n", var, val);
            }
          val = "";
        }
      else 
        {
          for (long j = 0; j < count; j++)
            {
              printf("%s\n", val);
            }
        }
      i++;
    }
  return EXIT_SUCCESS;
}

static void
usage (void)
{
  printf ("repeat, a tool for printing repeated environment variables\n");
  printf ("usage: repeat N VAR ...\n");
  printf ("each N must be a positive integer\n");
  printf ("N VAR can be repeated, but each repetition must have both\n");
}