91 lines
2.8 KiB
C
91 lines
2.8 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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struct station* station = (struct station*)calloc(1,sizeof(struct station));
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if (station == NULL) return NULL;
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station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
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if (station->tracks == NULL) return free(station), NULL;
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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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if (station == NULL) return;
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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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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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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 int hash = 0;
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if (station == NULL || target == NULL) return 0;
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while (*target != '\0') {
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hash = hash * 31u + (unsigned char)*target;
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target++;
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}
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return (int)(hash % (unsigned int)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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if (station == NULL || target == NULL) return;
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int index = select_track(station, target);
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struct car* current = station->tracks[index];
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while (current != NULL) {
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if (strcmp(current->value, target) == 0) {
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current->capacity += capacity;
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return;
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}
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current = current->next;
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}
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struct car* node = (struct car*)calloc(1, sizeof(struct car));
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if (node == NULL) return;
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strncpy(node->value, target, TARGET_SIZE - 1);
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node->capacity = capacity;
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node->next = station->tracks[index];
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station->tracks[index] = node;
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}
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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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struct car* current = station->tracks[select_track(station, target)];
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while (current != NULL) {
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if (strcmp(current->value, target) == 0) return current->capacity;
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current = current->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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int count = 0;
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if (station == NULL) return 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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int count_capacity(struct station* station){
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int sum = 0;
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if (station == NULL) return 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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sum += current->capacity;
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current = current->next;
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}
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}
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return sum;
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} |