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dp doubly linked list

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xamidev
2025-11-08 09:05:19 +01:00
parent 1fe8c521e0
commit 724d1c9876
6 changed files with 151 additions and 31 deletions
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31
igc.c
View File

@@ -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])
@@ -128,7 +127,7 @@ void parse_igc_file(FILE* fp)
struct IGC_DataPoint* dp = parse_datapoint(line);
//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;
}

4
igc.h
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@@ -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);

69
linkage.c Normal file
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@@ -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;
}

29
linkage.h Normal file
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@@ -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

45
main.c Normal file
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@@ -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;
}

2
makefile
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@@ -1,5 +1,5 @@
all:
gcc -Wall -Wextra igc.c
gcc -g -Wall -Wextra linkage.c igc.c main.c
clean:
rm a.out