dp doubly linked list

igc.c

@@ -14,6 +14,7 @@
 #include <errno.h>
 #include <string.h>
 #include "igc.h"
+#include "linkage.h"
 
 struct IGC_DataPoint* parse_datapoint(char* line)
 {
@@ -107,13 +108,11 @@ struct IGC_Header* parse_header_record(struct IGC_Header* hdr, char* line)
 	return hdr;
 }
 
-void parse_igc_file(FILE* fp)
+void parse_igc_file(FILE* fp, struct IGC_Header* hdr, struct dp_node* list)
 {
 	size_t len = 0;
 	char* line = NULL;
 
-	struct IGC_Header* hdr = (struct IGC_Header*)calloc(1, sizeof(struct IGC_Header));
-
 	while (getline(&line, &len, fp)	!= -1)
 	{
 		switch(line[0])
@@ -126,9 +125,9 @@ void parse_igc_file(FILE* fp)
 				break;
 			case DATAPOINT:
 				struct IGC_DataPoint* dp = parse_datapoint(line);
-				// show_datapoint(dp);
+				//show_datapoint(dp);
 				// Doubly linked list of points (so theyre joined in chronological order; opens possibilities for analysis later)
-				// append_datapoint(dp);
+				append_datapoint(list, dp);
 				break;
 			case HEADER:
 				hdr = parse_header_record(hdr, line);
@@ -143,27 +142,3 @@ void parse_igc_file(FILE* fp)
 	}
 	show_header_info(hdr);
 }
-
-int main(int argc, char* argv[])
-{
-	if (argc < 2)
-	{
-		printf("Usage: %s <file>\n", argv[0]);
-		return -EINVAL;
-	}
-
-	char filename[NAME_MAX] = {0};
-	strncpy(filename, argv[1], NAME_MAX-1);
-
-	FILE* fp = fopen(filename, "r");
-
-	if (!fp)
-	{
-		printf("Couldn't open file %s\n", filename);
-		return -EINVAL;
-	}
-
-	parse_igc_file(fp);
-
-	return EXIT_SUCCESS;
-}

igc.h

@@ -13,6 +13,8 @@
 #define NAME_MAX 256
 #define TMP_SIZE 8
 
+#include "linkage.h"
+
 enum IGC_RecordType
 {
 	MANUFACTURER = 'A',
@@ -81,7 +83,7 @@ struct IGC_DataPoint
 	int gps_alt;
 };
 
-void parse_igc_file(FILE* fp);
+void parse_igc_file(FILE* fp, struct IGC_Header* hdr, struct dp_node* list);
 struct IGC_DataPoint* parse_datapoint(char* line);
 void show_datapoint(struct IGC_DataPoint* dp);
 void show_header_info(struct IGC_Header* hdr);

linkage.c

@@ -0,0 +1,69 @@
+/*
+ * IGC parser - data linking module (doubly linked datapoint list)
+ * @brief parse IGC file, get all data points, compute average horizontal/vertical speed, print to STDOUT
+ *
+ * As per standard: https://xp-soaring.github.io/igc_file_format/igc_format_2008.html
+ *                  https://xp-soaring.github.io/igc_file_format/igc_fr_specification_with_al8_2023-2-1_0.pdf
+ *
+ * @author xamidev <xamidev@riseup.net>
+ * @license GNU GPL v3
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "igc.h"
+#include "linkage.h"
+
+struct dp_node* create_datapoint_list()
+{
+	struct dp_node* head = (struct dp_node*)calloc(1, sizeof(struct dp_node));
+
+	head->data = NULL;
+	head->prev = NULL;
+	head->next = NULL;
+	return head;	
+}
+
+void append_datapoint(struct dp_node* list, struct IGC_DataPoint* dp)
+{
+	struct dp_node* new = (struct dp_node*)calloc(1, sizeof(struct dp_node));
+
+	if (list->next == NULL)
+	{
+		list->next = new;
+		
+		new->prev = list;
+		new->next = NULL;
+		new->data = dp;
+		return;
+	}
+
+	while (list->next != NULL)
+	{
+		list = list->next;
+	}
+
+	list->next = new;
+	new->prev = list;
+	new->next = NULL;
+	new->data = dp;
+	return;
+}
+
+void print_datapoint_list(struct dp_node* list)
+{
+	if (list->data == NULL)
+	{
+		// We're at head!
+		list = list->next;
+	}
+
+	while (list->next != NULL)
+	{
+		show_datapoint(list->data);
+		printf(" <-> ");
+		list = list->next;		
+	}
+	puts("NULL");
+	return;
+}

linkage.h

@@ -0,0 +1,29 @@
+/*
+ * IGC parser - data linking module (doubly linked datapoint list)
+ * @brief parse IGC file, get all data points, compute average horizontal/vertical speed, print to STDOUT
+ *
+ * As per standard: https://xp-soaring.github.io/igc_file_format/igc_format_2008.html
+ *                  https://xp-soaring.github.io/igc_file_format/igc_fr_specification_with_al8_2023-2-1_0.pdf
+ *
+ * @author xamidev <xamidev@riseup.net>
+ * @license GNU GPL v3
+ */
+
+#ifndef LINKAGE_H
+#define LINKAGE_H
+
+#include "igc.h"
+
+struct dp_node
+{
+	struct IGC_DataPoint* data;
+
+	struct dp_node* prev;
+	struct dp_node* next;
+};
+
+struct dp_node* create_datapoint_list();
+void append_datapoint(struct dp_node* list, struct IGC_DataPoint* dp);
+void print_datapoint_list(struct dp_node* list);
+
+#endif

main.c

@@ -0,0 +1,45 @@
+/*
+ * IGC parser
+ * @brief parse IGC file, get all data points, compute average horizontal/vertical speed, print to STDOUT
+ *
+ * As per standard: https://xp-soaring.github.io/igc_file_format/igc_format_2008.html
+ *                  https://xp-soaring.github.io/igc_file_format/igc_fr_specification_with_al8_2023-2-1_0.pdf
+ *
+ * @author xamidev <xamidev@riseup.net>
+ * @license GNU GPL v3
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "igc.h"
+#include "linkage.h"
+
+int main(int argc, char* argv[])
+{
+	if (argc < 2)
+	{
+		printf("Usage: %s <file>\n", argv[0]);
+		return -EINVAL;
+	}
+
+	char filename[NAME_MAX] = {0};
+	strncpy(filename, argv[1], NAME_MAX-1);
+
+	FILE* fp = fopen(filename, "r");
+
+	if (!fp)
+	{
+		printf("Couldn't open file %s\n", filename);
+		return -EINVAL;
+	}	
+
+	struct dp_node* head = create_datapoint_list(); 
+	struct IGC_Header* hdr = (struct IGC_Header*)calloc(1, sizeof(struct IGC_Header));
+	parse_igc_file(fp, hdr, head);
+
+	print_datapoint_list(head);
+
+	return EXIT_SUCCESS;
+}

makefile

@@ -1,5 +1,5 @@
 all:
-	gcc -Wall -Wextra igc.c
+	gcc -g -Wall -Wextra linkage.c igc.c main.c
 
 clean:
 	rm a.out