usaa20/a5/program.c

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

#define MAX 10000

struct morsetree{
    char letter;
    struct morsetree *dash;
    struct morsetree *dot;

};

struct morsetree* create(char l){
    struct morsetree* new = calloc(1, sizeof(struct morsetree));
    new->letter = l;
    new->dot = NULL; 
    new->dash = NULL;
    return new;
}

struct morsetree* add(struct morsetree *tree, char *morse, char letter){
    struct morsetree *this;
    int i, size;

    this = tree;
    size = strlen(morse);

    for(i = 0; i < size; i++) {
        if(morse[i] == '.') {
            if(this->dot == NULL){
                this->dot = create('*');
            }
            this = this->dot;
        }
        else if(morse[i] == '-'){
            if(this->dash == NULL){
                this->dash = create('*');
            }
            this = this->dash;
        }
    }
    this->letter = letter;

}

void destroy(struct morsetree *root){
    if(root == NULL) return;
    
    destroy(root->dot);
    destroy(root->dash);   
    free(root);
    root = NULL;

}

void search(struct morsetree* root, char* decode){
    
    struct morsetree* this = root;
    int i = 0;
    for(i == 0; i <= strlen(decode); i++){  
       if(i == strlen(decode) && decode[strlen(decode)-1] == ' '){
          printf("\n");
          return;
       }
       if(decode[i] == ' ' || decode[i] == '\n' || decode[i] == '\0'){        
           printf("%c", this->letter);
           this = root;
       }
       if(decode[i] == '/'){
           printf(" ");
       }
       else{
            if(decode[i] == '.'){
                this = this->dot;
            }
            else if(decode[i] == '-'){
                this = this->dash;
            }
       }
      
    }
    
      
}

int main (){

    struct morsetree *root = create('*');

    add(root, ".-", 'A');
    add(root, "-..." ,'B' );
    add(root, "-.-.", 'C' );
    add(root, "-..", 'D');
    add(root, ".", 'E');
    add(root, "..-.", 'F');
    add(root, "--.", 'G');
    add(root, "....", 'H');
    add(root, "..", 'I');
    add(root, ".---", 'J');
    add(root, "-.-", 'K');
    add(root, ".-..", 'L');
    add(root, "--", 'M');
    add(root, "-.", 'N');
    add(root, "---", 'O');
    add(root, ".--.", 'P');
    add(root, "--.-", 'Q');
    add(root, ".-.", 'R');
    add(root, "...", 'S');
    add(root, "-", 'T');
    add(root, "..-", 'U');
    add(root, "...-", 'V');
    add(root, ".--", 'W');
    add(root, "-..-", 'X');
    add(root, "-.--", 'Y');
    add(root, "--..", 'Z');
    add(root, ".----", '1');   
    add(root, "..---", '2');
    add(root, "...--", '3');
    add(root, "....-", '4');
    add(root, ".....", '5');
    add(root, "-....", '6');
    add(root, "--...", '7');
    add(root, "---..", '8');
    add(root, "----.", '9');
    add(root, "-----", '0');    

    while(1){
        char line[MAX];  
        fgets(line, MAX, stdin);
        line[strlen(line)-1] = '\0';
        if(line[0] == '\0'){
            printf("\n");
            destroy(root); 
            return 0;           
        }
        search(root, line);
        //printf("\n");
        //printf("\n");
    }
    
    //destroy(root);
    return 0;
}