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du6/a_station.c

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+#include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+
+struct station* create_station(){
+    struct station* stanica = calloc(1, sizeof(struct station));
+    stanica->tracks = calloc(STATION_SIZE, sizeof(struct car*));
+    stanica->track_count = STATION_SIZE;
+    return stanica;
+}
+
+void destroy_station(struct station* stanica){
+    for (int i = 0; i < stanica->track_count; i++){
+        struct car* aktualny = stanica->tracks[i];
+        while (aktualny != NULL){
+            struct car* nasledujuci = aktualny->next;
+            free(aktualny);
+            aktualny = nasledujuci;
+        }
+    }
+    free(stanica->tracks);
+    free(stanica);
+}
+
+int select_track(struct station* stanica, const char* ciel){
+    unsigned long heslo = 5381;
+    int znak;
+    while ((znak = *ciel++)){
+        heslo = ((heslo << 5) + heslo) + znak;
+    }
+    return heslo % stanica->track_count;
+}
+
+void add_target_capacity(struct station* stanica, const char* ciel, int kapacita){
+    int index = select_track(stanica, ciel);
+    struct car* aktualny = stanica->tracks[index];
+
+    while (aktualny != NULL){
+        if (strcmp(aktualny->value, ciel) == 0){
+            aktualny->capacity += kapacita;
+            return;
+        }
+        aktualny = aktualny->next;
+    }
+
+    struct car* novy = calloc(1, sizeof(struct car));
+    strncpy(novy->value, ciel, TARGET_SIZE - 1);
+    novy->capacity = kapacita;
+    novy->next = stanica->tracks[index];
+    stanica->tracks[index] = novy;
+}
+
+int get_target_capacity(struct station* stanica, const char* ciel){
+    int index = select_track(stanica, ciel);
+    struct car* aktualny = stanica->tracks[index];
+
+    while (aktualny != NULL){
+        if (strcmp(aktualny->value, ciel) == 0){
+            return aktualny->capacity;
+        }
+        aktualny = aktualny->next;
+    }
+
+    return 0;
+}
+
+int count_targets(struct station* stanica){
+    int pocet = 0;
+
+    for (int i = 0; i < stanica->track_count; i++){
+        struct car* aktualny = stanica->tracks[i];
+        while (aktualny != NULL){
+            pocet++;
+            aktualny = aktualny->next;
+        }
+    }
+
+    return pocet;
+}
+
+int count_capacity(struct station* stanica){
+    int celkovo = 0;
+
+    for (int i = 0; i < stanica->track_count; i++){
+        struct car* aktualny = stanica->tracks[i];
+        while (aktualny != NULL){
+            celkovo += aktualny->capacity;
+            aktualny = aktualny->next;
+        }
+    }
+
+    return celkovo;
+}