136 lines
2.7 KiB
C
136 lines
2.7 KiB
C
#include "a_station.h"
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#include <stdlib.h>
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#include <string.h>
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struct station* create_station()
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{
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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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void destroy_station(struct station* station)
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{
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if (station == NULL)
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{
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return;
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}
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for (int i = 0; i < station->track_count; i++)
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{
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struct car* this = station->tracks[i];
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while (this != NULL)
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{
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struct car* temp = this;
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this = this->next;
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free(temp);
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}
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}
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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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{
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//DJB2 hash
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unsigned int hash = 5381;
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int c;
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while ((c = *target++))
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{
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hash = hash * 33 + c;
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}
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return hash % station->track_count;
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}
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void add_target_capacity(struct station* station, const char* target, int capacity)
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{
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int stIndex = select_track(station, target);
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struct car* start = station->tracks[stIndex];
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struct car* this = start;
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while (this != NULL)
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{
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if (strcmp(this->value, target) == 0)
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{
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this->capacity += capacity;
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return;
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}
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this = this->next;
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}
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struct car* nCar = (struct car*)malloc(sizeof(struct car));
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if (nCar == NULL)
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{
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return;
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}
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strncpy(nCar->value, target, TARGET_SIZE - 1);
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nCar->value[TARGET_SIZE - 1] = '\0';
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nCar->capacity = capacity;
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nCar->next = start;
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station->tracks[stIndex] = nCar;
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}
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int get_target_capacity(struct station* station,const char* target)
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{
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int indTr = select_track(station, target) % station->track_count;
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struct car* this = station->tracks[indTr];
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while (this != NULL)
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{
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if (strcmp(this->value, target) == 0)
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{
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return this->capacity;
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}
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this = this->next;
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}
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return 0;
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}
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int count_targets(struct station* station)
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{
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int count = 0;
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for (int i = 0; i < station->track_count; i++)
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{
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struct car* current = station->tracks[i];
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while (current != NULL)
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{
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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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int count_capacity(struct station* station)
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{
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int res = 0;
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for (int i = 0; i < station->track_count; i++)
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{
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struct car* current = station->tracks[i];
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while (current != NULL)
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{
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res += current->capacity;
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current = current->next;
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}
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}
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return res;
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}
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