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cv6/a_station.c

@@ -0,0 +1,96 @@
+#include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+
+struct station* create_station(){
+   struct station* station = (struct station*)calloc(1,sizeof(struct station));
+   station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
+   station->track_count = STATION_SIZE;
+   return station;
+}
+
+void destroy_station(struct station* station){
+	for(int i =0;i<station->track_count;i++){
+		struct car* thisObj = station->tracks[i];
+		while(thisObj!=NULL){
+			struct car* delet = thisObj;
+			thisObj = thisObj->next;
+			free(delet);
+		}
+	}
+	free(station->tracks);
+	free(station);
+}
+unsigned long hash_string(unsigned char* str){
+    unsigned long hash = 0;
+    int c;
+    while (c = *str++){
+        hash = c + (hash << 6) + (hash << 16) - hash;
+	}
+    return hash;
+}
+
+int select_track(struct station* station, const char* target){
+    unsigned long hash= hash_code((unsigned char*)target);
+	int index = hash % station->track_count;
+	
+	return index;
+}
+
+void add_target_capacity(struct station* station,const char* target, int capacity){
+	int index = select_track(station,target);
+	struct car* thisObj = station->tracks[indexH];
+	
+	if(thisObj!=NULL){
+		while(thisObj!=NULL){
+			if(strcmp(thisObj->value,target)==0){
+				thisObj->capacity+=capacity;
+			}
+			thisObj = thisObj->next;
+		}
+	}else{
+			struct car* newCar = calloc(1,sizeof(struct car));
+			newCar->capacity = capacity;
+			strcpy(newCar->value,target);
+			station->tracks[indexHash] = newCar;
+	}
+}
+
+int get_target_capacity(struct station* station,const char* target){
+    for(int i=0;i<station->track_count;i++){
+		struct car* thisObj = station->tracks[i];
+		while(thisObj!=NULL){
+			if(strcmp(thisObj->value,target)==0){
+				return thisObj->capacity;
+			}
+			thisObj = thisObj->next;
+		}
+	}
+	return 0;
+}
+
+int count(struct station* station){
+    int count = 0;
+	for(int i =0;i<station->track_count;i++){
+		struct car* thisObj = station->tracks[i];
+		while(thisObj!=NULL){
+			count++;
+			thisObj = thisObj->next;
+		}
+	}
+	return count;
+}
+
+int count_capacity(struct station* station){
+	int capacity = 0;
+	
+	for(int i =0;i<station->track_count;i++){
+		struct car* thisObj = station->tracks[i];
+		while(thisObj!=NULL){
+			capacity+=thisObj->capacity;
+			thisObj = thisObj->next;
+		}
+	}
+    return capacity;
+}
+

cv6/a_station.h

@@ -0,0 +1,91 @@
+#ifndef STATION_H
+#define STATION_H
+// Pocet trati k dispozicii
+#define STATION_SIZE 10
+// Maximalny pocet znakov pre ulozenie nazvu cielovej stanice
+#define TARGET_SIZE 36
+
+/**
+ * Jeden zaznam o kapacite do cielovej stanice
+ */
+struct car {
+    // Cielova stanica / nazov
+    char value[TARGET_SIZE];
+    // Pocet cestujuchich
+    int capacity;
+    // Smernik na dalsi zaznam
+    struct car* next;
+};
+
+/**
+ * Cela databaza zaznamov
+ */
+struct station {
+    // Dynamicke pole smernikov na zaznamy
+    // jeden zaznam ma typ struct car*
+    struct car** tracks;
+    // Velkost pola tracks
+    int track_count;
+};
+
+
+/**
+ * Vytvori prazdnu stanicu.
+ * Alokuje pole smernikov tracks na pociatocnu kapacitu STATION_SIZE
+ * nastavi velkost capacity na STATION_SIZE
+ * @return smernik na prazdnu stanicu
+ */
+struct station* create_station();
+
+/**
+ * Uvolni pamat
+ * @param smernik na databazu
+ */
+void destroy_station(struct station* station);
+
+/**
+ * Vyberie poziciu v poli station->tracks pre ulozenie zaznamu target
+ *
+ * Proces vyberu by mal splnat kriteria pre hash funkciu:
+ * - rovnaky retazec by mal vzdy mat rovnaky vysledok
+ * - pre rozne retazce by mali byt vysledky co najviac rozne
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ * @return cislo v intervale 0 az N-1, kde N je  station->track_count
+ */
+int select_track(struct station* station, const char* target);
+
+/**
+ * Zvysi zaznam o pocte cestujucich do danej cielovej stanice.
+ *
+ * Najprv sa vyberie cielova trat pomocou select_track(). Ak zaznam neexistuje, 
+ * vytvori sa novy. Ak zaznam na danej trati (spojkovom zozname) existuje, cislo sa pripocita.
+ * V databaze nesmu byt dva zaznamy s rovnakou cielovou stanicou.
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ */
+void add_target_capacity(struct station* station,const char* target, int capacity);
+
+/**
+ * Ziska zaznam o cielovej stanici.
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ *
+ * @return kapacitu do cielovej stanice. Ak sa zaznam nenachedza, vrati nula.
+ */
+int get_target_capacity(struct station* station,const char* target);
+
+/**
+ * Spocita pocet cielovych stanic
+ * @param smernik na databazu
+ */
+int count_targets(struct station* station);
+
+/**
+ * Spocita kapacitu vo vsetkych zaznamoch
+ * @param smernik na databazu
+ */
+int count_capacity(struct station* station);
+#endif