76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.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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if(!strcmp(target, ""))
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return NULL;
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if(!first || !strcmp(first->value, "")){
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first = (struct car*)calloc(1, sizeof(struct car));
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strcpy(first->value, target);
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first->next = NULL;
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return first;
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}
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struct car* temp = first;
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while(temp->next != NULL)
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temp = temp->next;
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temp->next = (struct car*)calloc(1, sizeof(struct car));
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strcpy(temp->next->value, target);
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temp->next->next = NULL;
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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* temp = first;
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while(temp != NULL){
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printf("%s\n", temp->value);
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temp = temp->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)
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return;
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struct car* temp = first;
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struct car* next = temp->next;
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while(next != NULL){
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next = temp->next;
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free(temp);
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temp = next;
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}
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first = NULL;
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}
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struct car* clear_train(struct car* first, const char* target){
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if(!first || !strcmp(target, ""))
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return NULL;
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struct car* temp = first;
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struct car* next = temp->next;
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while(temp != NULL){
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next = temp->next;
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if(!strcmp(temp->value, target)) {
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if(temp == first) {
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free(first);
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first = NULL;
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}
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else
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free(temp);
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}
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temp = next;
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if(!first)
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first = temp;
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}
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return first;
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} |