121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
#include "a_station.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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//vytvorit prazdnu stanicu
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struct station* create_station() {
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struct station* station = (struct station*)calloc(1, sizeof(struct station));
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station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
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station->track_count = STATION_SIZE;
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return station;
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}
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//uvolnit vsetku pamat v tabuľke.
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void destroy_station(struct station* station) {
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if (station == NULL) return;
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//prejdi vsetky trate
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for (int i = 0; i < station->track_count; i++) {
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struct car* current = station->tracks[i];
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//prejdi vsetky zaznamy na trati a uvolni ich
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while (current != NULL) {
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struct car* next = current->next;
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free(current);
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current = next;
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}
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}
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//uvolni pole smernikov a stanicu
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free(station->tracks);
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free(station);
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}
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int select_track(struct station* station, const char* target) {
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unsigned long hash = 5381;
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int c;
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while ((c = *target++))
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hash = ((hash << 5) + hash) + c;
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return (int)(hash % station->track_count);
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}
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//prida alebo aktualizuje zaznam v stanici
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void add_target_capacity(struct station* station, const char* target, int capacity) {
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if (station == NULL || target == NULL) return;
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int track = select_track(station, target);
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struct car* current = station->tracks[track];
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struct car* prev = NULL;
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//prehladavanie spojkoveho zoznamu na trati
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while (current != NULL) {
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if (strcmp(current->value, target) == 0) {
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//zvysit kapacitu ak stanica existuje
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current->capacity += capacity;
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return;
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}
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prev = current;
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current = current->next;
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}
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//novy zaznam ak neexistuje
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struct car* new_car = (struct car*)calloc(1, sizeof(struct car));
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strncpy(new_car->value, target, TARGET_SIZE - 1);
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new_car->value[TARGET_SIZE - 1] = '\0';
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new_car->capacity = capacity;
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new_car->next = NULL;
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if (prev == NULL) {
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station->tracks[track] = new_car;
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} else {
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prev->next = new_car;
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}
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}
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//vyhladat kapacitu pre zadanu cielovu stanicu
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int get_target_capacity(struct station* station, const char* target) {
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if (station == NULL || target == NULL) return 0;
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int track = select_track(station, target);
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struct car* current = station->tracks[track];
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while (current != NULL) {
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if (strcmp(current->value, target) == 0)
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return current->capacity;
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current = current->next;
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}
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return 0; //nenaslo
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}
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//spocitat pocet roznych cielovych stanic
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int count_targets(struct station* station) {
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if (station == NULL) return 0;
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int count = 0;
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for (int i = 0; i < station->track_count; i++) {
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struct car* current = station->tracks[i];
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while (current != NULL) {
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count++;
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current = current->next;
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}
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}
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return count;
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}
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//spocitat celkovu kapacitu vsetkych zaznamov
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int count_capacity(struct station* station) {
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if (station == NULL) return 0;
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int total = 0;
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for (int i = 0; i < station->track_count; i++) {
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struct car* current = station->tracks[i];
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while (current != NULL) {
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total += current->capacity;
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current = current->next;
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}
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}
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return total;
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}
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