c++ wc 구현 질문이요.

int main(int argc, char *argv[])
{
 
    int i;
    int total_ch, total_word, total_line;
 
    total_ch = total_word = total_line = 0;
 
  int j;    
  j = (argc > 1) ? 1:0;
  int opt;
  bool c_On = false, l_On=false, m_On = false, w_On = false;
 
 
 
 
  for (int i = j; i < argc;i++){
    while ((opt = getopt(argc, argv, "clmw")) != -1) {
               switch (opt) {
               case 'c':
                   c_On=true;
                   break;
               case 'l':
                   l_On = true;
                   break;
	       case 'm':
                   m_On = true;
                   break;
	       case 'w':
                   w_On = true;
                   break;
               default:
			printf("Try `wc --help' for more information.\n");
                 	return EXIT_SUCCESS;
               }
     }
 
   }
if(c_On == false && l_On == false && m_On == false && w_On == false){
	if( argc == 1 ) {
       	 	wc(argv[0], NULL, &total_ch, &total_word, &total_line);
    	}
 
	else {
        	for( i=1 ; i<argc ; i++ ) {
         		wc(argv[0], argv[i], &total_ch, &total_word, &total_line);
        	}
    	}
 
    	if( argc > 2 ) {
        	printf("%7d %8d %8d total\n", total_line, total_word, total_ch);
   	}
}
 
}
int wc(char *cmdname, char *filename, int *total_ch, int *total_word, int *total_line)
{
    int flag;
    struct stat st;
    FILE *fp;
    char ch;
    int word_flag;
    int num_ch, num_word, num_line;
 
    if( filename == NULL ) {
        fp = stdin;
    }
    else {
        flag = lstat(filename, &st);
        if( flag == -1 ) {
            printf( "%s: %s: No such file or directory\n", cmdname, filename);
            return 0;
        }
 
        if( S_ISREG(st.st_mode) ) {
            fp = fopen(filename,  "r");
            if( fp == NULL ) {
                printf("%s: %s: Permission denied\n", cmdname, filename);
                return 0;
            }
        }
        else if( S_ISDIR(st.st_mode) ) {
            printf("%s: %s: Is a directory\n", cmdname, filename);
             return 0;
        }
        else {
            return 0;
        }
    }
 
    num_ch = num_word = num_line = 0;
    word_flag = 0;
    while( (ch = getc(fp)) != EOF ) {
        ++num_ch;
        if( isspace(ch) ) {
            if( word_flag == 1 ) {
                word_flag = 0;
                ++num_word;
            }
        }
        else {
            word_flag = 1;
        }
        if( ch ==  '\n' )
            ++num_line;
    }
 
    fclose(fp);
    printf("%7d %8d %8d %s\n", num_line, num_word, num_ch, filename);
 
    *total_ch += num_ch;
    *total_word += num_word;
    *total_line += num_line;
    return 0;
}