60 lines
1.4 KiB
C
60 lines
1.4 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 (newcar == NULL) {
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return first;
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}
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strcpy(newcar->value, target);
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newcar->next = NULL;
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if (first == NULL) {
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return newcar;
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}
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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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struct car* this = first;
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while (this != NULL) {
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printf("%s\n", this->value);
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this = this->next;
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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) return;
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cancel_train(first->next);
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free(first);
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}
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struct car* clear_train(struct car* first, const char* target) {
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struct car* current = first;
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struct car* prev = NULL;
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while (current != NULL) {
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if (strcmp(current->value, target) == 0) {
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struct car* to_delete = current;
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if (prev == NULL) {
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first = current->next;
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} else {
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prev->next = current->next;
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}
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current = current->next;
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free(to_delete);
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} else {
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prev = current;
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current = current->next;
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}
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}
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return first;
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}
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