du6..

du6/a_station.c

@@ -0,0 +1,147 @@
+#include "station.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct station* create_station() {
+    struct station* st = (struct station*)malloc(sizeof(struct station));
+    if (st == NULL) {
+        return NULL;
+    }
+
+    st->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
+    if (st->tracks == NULL) {
+        free(st);
+        return NULL;
+    }
+
+    st->track_count = STATION_SIZE;
+    return st;
+}
+
+void destroy_station(struct station* station) {
+    int i;
+
+    if (station == NULL) {
+        return;
+    }
+
+    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* ptr;
+
+    if (station == NULL || station->track_count <= 0 || target == NULL) {
+        return 0;
+    }
+
+    ptr = (const unsigned char*)target;
+    while (*ptr != '\0') {
+        hash = ((hash << 5) + hash) + *ptr;
+        ptr++;
+    }
+
+    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;
+
+    if (station == NULL || station->tracks == NULL || target == NULL) {
+        return;
+    }
+
+    index = select_track(station, target);
+    current = station->tracks[index];
+
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            current->capacity += capacity;
+            return;
+        }
+        current = current->next;
+    }
+
+    current = (struct car*)malloc(sizeof(struct car));
+    if (current == NULL) {
+        return;
+    }
+
+    strncpy(current->value, target, TARGET_SIZE - 1);
+    current->value[TARGET_SIZE - 1] = '\0';
+    current->capacity = capacity;
+    current->next = station->tracks[index];
+    station->tracks[index] = current;
+}
+
+int get_target_capacity(struct station* station, const char* target) {
+    int index;
+    struct car* current;
+
+    if (station == NULL || station->tracks == NULL || target == NULL) {
+        return 0;
+    }
+
+    index = select_track(station, target);
+    current = station->tracks[index];
+
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 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) {
+            sum += current->capacity;
+            current = current->next;
+        }
+    }
+
+    return sum;
+}