csv schreiben und lesen

src/db.c

@@ -18,25 +18,108 @@
 #include "list.h"
 
 /*
-write a complete linkedlist to a csv file.
+write a complete linkedlist to a Event csv file.
  */
 void write_linkedlist_to_csv(llist* head, const char* filename) {
-  //Open file with write permision
-  FILE* file = fopen(filename, "w");
-  //if there is no file or a wrong file path you becom an error
+	//Open file with write permision
+	FILE* file = fopen(filename, "w");
+	//if there is no file or a wrong file path you becom an error
+	if (file == NULL) {
+    	perror("Could not open file %s\n", filename);
+  	}
+  	else{
+    	//write the file header
+    	fprintf(file, "TaskName, Created, Deadline, Priority, Spare, EventStartTime, EventEndTime, EventSpare\n");
+
+    	// Iterate through the linked list and write the data to the CSV
+  		llist* current = head;
+  		while (current != NULL) {
+    		// Extract data from the current node
+    		Event* event = (Event*)current->data;  // Assumed that current->data holds an Event pointer
+
+    		// Extract the associated task from the event
+    		Task* task = event->task;
+
+    		// Write the task and event data to the CSV file
+    		fprintf(file, "%s, %lu, %lu, %d, %lu, %lu, %lu, %lu\n",
+            	task->name,
+            	task->created,
+            	task->deadline,
+            	task->priority,
+            	task->spare,
+            	event->plannedStartTime,
+            	event->plannedEndTime,
+            	event->spare);
+
+    		current = current->next;
+  		}
+	fclose(file); // Close the file
+	}
+}
+
+/*
+read an event csv file and write the data in a linked list
+ */
+
+void write_csv_to_llist(const char* filename) {
+	//Open file with read permision
+  FILE* file = fopen(filename, "r");
   if (file == NULL) {
-    printf("Could not open file %s\n", filename);
+    perror("Could not open file %s\n", filename);
   }
   else{
-    //write the file head
-    //fprintf(file, "**********************");
+	char line[1024]; //Line Buffer
+    int count = 0; //task counter
+    llist *list = NULL
+    fgets(line, sizeof(line), file); //read and ignore file head
+    while (fgets(line, sizeof(line), file)) {
+      	count++;
+    	//remove newline sign
+        line[strcspn(line, "\n")] = '\0';
 
-    // iteration through the list and write data to csv
-    llist* current = head;
-    while (current != NULL) {
-         //fprintf(file, "%d \n", current->id );
-          current = current->next;
+        // column slice
+        char *taskname = strtok(line, ",");
+        char *tsakcreation_dateSTR = strtok(NULL, ",");
+        char *tsakdeadline_dateSTR = strtok(NULL, ",");
+        char *tsakprioritySTR = strtok(NULL, ",");
+        char *tsakspareSTR = strtok(NULL, ",");
+        char *eventStartTimeSTR = strtok(NULL, ",");
+        char *eventEndTimeSTR = strtok(NULL, ",");
+        char *eventSpareSTR = strtok(NULL, ",");
+
+        // convert char in integer and date
+        unsigned long int taskcreation_date = strtoul(taskcreation_dateSTR,NULL,10);
+        unsigned long int taskdeadline_date = strtoul(taskdeadline_dateSTR,NULL,10);
+        unsigned long int taskspare = strtoul(taskspareSTR,NULL,10);
+        unsigned long int eventStartTime = strtoul(eventStartTimeSTR,NULL,10);
+        unsigned long int eventEndTime = strtoul(eventEndTimeSTR,NULL,10);
+        unsigned long int eventSpare = strtoul(eventSpareSTR,NULL,10);
+
+        int priority = atoi(prioritySTR);
+
+
+
+        //create Task
+        Task *task = newTask(taskname, taskcreation_date, taskdeadline_date, taskpriority, taskspare);
+
+        //create Event
+        Event *event = newEvent(task,eventStartTime, eventEndTime, eventSpare);
+
+        // Insert task into the linked list
+        if (list == NULL) {
+            // If the list is empty, initialize it with the first task
+            list = llistNew(event, NULL);
+        }
+        else {
+            // Append the task to the linked list
+            llistAppend(list, event);
+        }
     }
-    fclose(file)
+
+    fclose(file);
   }
-}
+
+
+
+}
+