dd788gj/pvjc26
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Přidat du6/a_station.c

Browse Source
This commit is contained in:
Daniel Dembický 2026-04-21 07:30:22 +00:00
parent e3dc16f3bf
commit b0838b9e91
1 changed files with 176 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

176
du6/a_station.c Normal file
View File

@ -0,0 +1,176 @@
#include "a_station.h"
#include <limits.h>
#include <stdlib.h>
#include <string.h>
static void normalize_target(char normalized[TARGET_SIZE], const char* target) {
if (target == NULL) {
normalized[0] = '\0';
return;
}
strncpy(normalized, target, TARGET_SIZE - 1);
normalized[TARGET_SIZE - 1] = '\0';
}
struct station* create_station() {
struct station* station = (struct station*)calloc(1, sizeof(struct station));
if (station == NULL) {
return NULL;
}
station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
if (station->tracks == NULL) {
free(station);
return NULL;
}
station->track_count = STATION_SIZE;
return station;
}
void destroy_station(struct station* station) {
int i;
if (station == NULL) {
return;
}
if (station->tracks != NULL) {
for (i = 0; i < station->track_count; i++) {
struct car* current = station->tracks[i];
while (current != NULL) {
struct car* next = current->next;
free(current);
current = next;
}
}
free(station->tracks);
}
free(station);
}
int select_track(struct station* station, const char* target) {
unsigned long hash = 5381;
const unsigned char* p;
char normalized[TARGET_SIZE];
if (station == NULL || station->track_count <= 0 || target == NULL) {
return 0;
}
normalize_target(normalized, target);
p = (const unsigned char*)normalized;
while (*p != '\0') {
hash = ((hash << 5) + hash) + *p;
p++;
}
return (int)(hash % (unsigned long)station->track_count);
}
void add_target_capacity(struct station* station, const char* target, int capacity) {
int index;
struct car* current;
struct car* new_car;
char normalized[TARGET_SIZE];
if (station == NULL || station->tracks == NULL || target == NULL || capacity <= 0) {
return;
}
normalize_target(normalized, target);
index = select_track(station, normalized);
current = station->tracks[index];
while (current != NULL) {
if (strcmp(current->value, normalized) == 0) {
if (current->capacity > INT_MAX - capacity) {
current->capacity = INT_MAX;
return;
}
current->capacity += capacity;
return;
}
current = current->next;
}
new_car = (struct car*)calloc(1, sizeof(struct car));
if (new_car == NULL) {
return;
}
strncpy(new_car->value, normalized, TARGET_SIZE - 1);
new_car->value[TARGET_SIZE - 1] = '\0';
new_car->capacity = capacity;
new_car->next = station->tracks[index];
station->tracks[index] = new_car;
}
int get_target_capacity(struct station* station, const char* target) {
int index;
struct car* current;
char normalized[TARGET_SIZE];
if (station == NULL || station->tracks == NULL || target == NULL) {
return 0;
}
normalize_target(normalized, target);
index = select_track(station, normalized);
current = station->tracks[index];
while (current != NULL) {
if (strcmp(current->value, normalized) == 0) {
return current->capacity;
}
current = current->next;
}
return 0;
}
int count_targets(struct station* station) {
int i;
int count = 0;
if (station == NULL || station->tracks == NULL) {
return 0;
}
for (i = 0; i < station->track_count; i++) {
struct car* current = station->tracks[i];
while (current != NULL) {
count++;
current = current->next;
}
}
return count;
}
int count_capacity(struct station* station) {
int i;
int sum = 0;
if (station == NULL || station->tracks == NULL) {
return 0;
}
for (i = 0; i < station->track_count; i++) {
struct car* current = station->tracks[i];
while (current != NULL) {
if (current->capacity > 0 && sum > INT_MAX - current->capacity) {
return INT_MAX;
}
sum += current->capacity;
current = current->next;
}
}
return sum;
}