85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "a_train.h"
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struct car* add_car(struct car* first,const char* target) {
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struct car* newcar = calloc(1, sizeof(struct car));
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if(target == NULL){
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return 0;
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}
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if(first == NULL){
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strcpy(newcar->value, target);
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newcar->next = NULL;
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return newcar;
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}
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strcpy(newcar->value,target);
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newcar->next = NULL;
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struct car *this = first;
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while(this->next != NULL){
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this = this->next;
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}
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this->next = newcar;
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return first;
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}
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void print_train(struct car* first) {
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for(struct car* this = first; this != NULL; this = this->next){
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printf("%s\n", this->value);
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}
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}
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void cancel_train(struct car* first) {
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if(first == NULL){
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return;
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}
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if(first->next != NULL){
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cancel_train(first->next);
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first->next = NULL;
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}
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else if(first->next == NULL){
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free(first);
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}
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}
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struct car* clear_train(struct car* first, const char* target) {
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if(first == NULL){
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return 0;
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}
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if(first->next == NULL){
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int result = strcmp(first->value, target);
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if(result == 0){
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free(first);
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return 0;
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}
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}
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else{
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struct car* this = first;
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while(first != NULL){
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int x = strcmp(this->value, target);
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if(x == 0){
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struct car* prev = this;
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struct car* node = this->next;
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while(prev != NULL && node != NULL){
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prev->next = node->next;
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free(node);
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prev = prev->next;
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if(prev != NULL){
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node = prev->next;
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return 0;
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}
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}
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}
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this = this->next;
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}
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}
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return first;
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}
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