%{ unsigned int char_count = 0, word_count = 0, line_count = 0; %} %% [^ /t/n]+ {word_count++; char_count+=yyleng;}; /n {char_count++; line_count++;}; . char_count++; %% char **file_list; unsigned int current_file = 0; unsigned int total_file = 0; unsigned int total_cc = 0; unsigned int total_wc = 0; unsigned int total_lc = 0; typedef struct file_info{   unsigned int c;   unsigned int w;   unsigned int l;   char *name; }INFO; INFO **all; int create_info(int num) {   INFO *tmp;   int i;   if (num <= 0){     return -1;   }   all = (INFO **)malloc(sizeof(int *)*num);   for (i = 0; i < num; i++){     tmp = (INFO *)malloc(sizeof(INFO));     tmp->c = 0;     tmp->w = 0;     tmp->l = 0;     tmp->name = NULL;     all[i] = tmp;   }   return 1; }   int delete_info(int num) {   int i;   if ((all == (INFO **)0) || num <= 0){     return -1;   }   for (i = 0; i < num; i++){     free(all[i]);   }   free(all);   return 1; } int set_info(int pos) {   int length = 0;   if (pos < 0){     return -1;   }   all[pos]->c = char_count;   all[pos]->w = word_count;   all[pos]->l = line_count;     all[pos]->name = file_list[pos];      return 1; } int main(int argc, char** argv) {   FILE *file;     int position = 0;   int i;      file_list = argv + 1;   total_file = argc - 1;   current_file = 0;      printf("--------------------------------------------------------------/n",  total_file);      if (argc > 1){     if (create_info(total_file) == -1){       fprintf(stderr, "%s/n", "Encounter a error when malloc memory.");       exit(1);     }   }   if (argc == 2){                 file=fopen(argv[1], "r");     if (!file){       fprintf(stderr, "Could not open %s./n", argv[1]);       delete_info(total_file);       exit(1);     }         yyin = file;   }      yywrap();   yylex();     if (argc > 1){     total_cc += char_count;     total_wc += word_count;     total_lc += line_count;              if (set_info(current_file-1) == -1){       fprintf(stderr, "%s/n", "Encounter a error when set information to  INFO.");       delete_info(total_file);       exit(1);     }              for (i = 0; i < total_file; i++){       printf("char:%-8lu word:%-8lu line:%-8lu file name:%s/n", all[i]-> c, all[i]->w, all[i]->l, file_list[i]);     }     printf("----------------------- total -------------------------------- /n");     printf("chars:%-8lu words:%-8lu lines:%-8lu files:%d/n", total_cc, tot al_wc, total_lc, total_file);   }else{         printf("char:%-8lu word:%-8lu line:%-8lu/n", char_count, word_count, l ine_count);   }      delete_info(total_file);   return 0; }  yywrap() {   FILE *file = NULL;      if ((current_file > 0) && (current_file < total_file) && (total_file > 1)) {     total_cc += char_count;     total_wc += word_count;     total_lc += line_count;          if (set_info(current_file-1) == -1){       fprintf(stderr, "%s/n", "Encounter a error when set information to  INFO.");       delete_info(total_file);       exit(1);     }            char_count = word_count = line_count = 0;     fclose(yyin);       }   while ((file_list[current_file] != (char *)0) && (current_file < total_fil e)){          file = fopen(file_list[current_file++], "r");     if (!file){       fprintf(stderr, "could not open %s .", file_list[current_file - 1] );     }else{       yyin = file;       break;     }   }   return (file? 0 : 1); }