/*
**  Portable, public domain strupr() & strlwr()
*/

#include <ctype.h>

char *strupr(char *str)
{
      char *string = str;

      if (str)
      {
            for ( ; *str; ++str)
                  *str = toupper(*str);
      }
      return string;
}

char *strlwr(char *str)
{
      char *string = str;

      if (str)
      {
            for ( ; *str; ++str)
                  *str = tolower(*str);
      }
      return string;
}

#ifdef TEST

#include <stdio.h>

main()
{
      char *string = "This is a *TEST*! (Isn't it?)";

      printf("string         = %s\n", string);
      printf("strupr(string) = %s\n", strupr(string));
      printf("strlwr(string) = %s\n", strlwr(string));
      return 0;
}

#endif