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

static int
usage(const char *prog)
{
   fprintf(stderr, "Usage: %s [-l] [-0] <string to emit> <# of times>\n", prog);
   return 1;
}

int
main(int argc, char **argv)
{
   extern int optind;	/* next argument to process */
   extern char *optarg; /* pointer to argument parameter */
   int flag;

   while ((flag = getopt(argc, argv, "0l")) != EOF) {
      switch (flag) {
      case '0':
	 setvbuf(stdout, NULL, _IONBF, 0);
	 break;
      case 'l':
	 setlinebuf(stdout);
	 break;
      default:
	 return usage(*argv);
      }
   }
   if (argc-optind != 2)
      return usage(*argv);

   {
      char s[strlen(argv[optind])+2];
      int c = atoi(argv[optind+1]);
      int i;

      signal(SIGPIPE, SIG_IGN);
      strcpy(s, argv[optind]);
      strcat(s, "\n");
      for (i = 1; i <= c; i++) {
	 size_t rc;

	 if ((rc = fwrite(s, 1, sizeof(s)-1, stdout)) != sizeof(s)-1) {
	    fprintf(stderr, "%d. fwrite returned %zu instead of %zu\n",
		    i, rc, sizeof(s)-1);
	    return 1;
	 }
	 else
	    fprintf(stderr, "%d. fwrite wrote %zu bytes and ferror is %d\n",
		    i, rc, ferror(stdout));
      }
   }
   return 0;
}