148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
#include "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* st = (struct station*)malloc(sizeof(struct station));
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if (st == NULL) {
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return NULL;
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}
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st->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
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if (st->tracks == NULL) {
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free(st);
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return NULL;
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}
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st->track_count = STATION_SIZE;
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return st;
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}
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void destroy_station(struct station* station) {
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int i;
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if (station == NULL) {
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return;
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}
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for (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 long hash = 5381;
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const unsigned char* ptr;
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if (station == NULL || station->track_count <= 0 || target == NULL) {
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return 0;
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}
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ptr = (const unsigned char*)target;
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while (*ptr != '\0') {
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hash = ((hash << 5) + hash) + *ptr;
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ptr++;
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}
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return (int)(hash % (unsigned long)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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int index;
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struct car* current;
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if (station == NULL || station->tracks == NULL || target == NULL) {
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return;
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}
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index = select_track(station, target);
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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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current = (struct car*)malloc(sizeof(struct car));
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if (current == NULL) {
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return;
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}
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strncpy(current->value, target, TARGET_SIZE - 1);
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current->value[TARGET_SIZE - 1] = '\0';
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current->capacity = capacity;
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current->next = station->tracks[index];
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station->tracks[index] = current;
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}
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int get_target_capacity(struct station* station, const char* target) {
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int index;
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struct car* current;
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if (station == NULL || station->tracks == NULL || target == NULL) {
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return 0;
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}
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index = select_track(station, target);
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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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return current->capacity;
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}
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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 i;
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int count = 0;
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if (station == NULL || station->tracks == NULL) {
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return 0;
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}
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for (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 i;
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int sum = 0;
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if (station == NULL || station->tracks == NULL) {
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return 0;
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}
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for (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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}
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