commit

du6/a_station.c

@@ -0,0 +1,91 @@
+#include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+
+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) return free(station), NULL;
+   station->track_count = STATION_SIZE;
+   return station;
+}
+
+void destroy_station(struct station* station){
+    if (station == NULL) return;
+    for (int 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 int hash = 0;
+    if (station == NULL || target == NULL) return 0;
+    while (*target != '\0') {
+        hash = hash * 31u + (unsigned char)*target;
+        target++;
+    }
+    return (int)(hash % (unsigned int)station->track_count);
+}
+
+void add_target_capacity(struct station* station,const char* target, int capacity){
+    if (station == NULL || target == NULL) return;
+    int index = select_track(station, target);
+    struct car* current = station->tracks[index];
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            current->capacity += capacity;
+            return;
+        }
+        current = current->next;
+    }
+    struct car* node = (struct car*)calloc(1, sizeof(struct car));
+    if (node == NULL) return;
+    strncpy(node->value, target, TARGET_SIZE - 1);
+    node->capacity = capacity;
+    node->next = station->tracks[index];
+    station->tracks[index] = node;
+}
+
+int get_target_capacity(struct station* station,const char* target){
+    if (station == NULL || target == NULL) return 0;
+    struct car* current = station->tracks[select_track(station, target)];
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) return current->capacity;
+        current = current->next;
+    }
+    return 0;
+}
+
+int count_targets(struct station* station){
+    int count = 0;
+    if (station == NULL) return 0;
+    for (int 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 sum = 0;
+    if (station == NULL) return 0;
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current != NULL) {
+            sum += current->capacity;
+            current = current->next;
+        }
+    }
+    return sum;
+}